aboutsummaryrefslogblamecommitdiffstats
path: root/lib/stdlib/test/dets_SUITE.erl
blob: b68d83b12d437c361b33e403b475a92e7619600b (plain) (tree)
1
2
3
4
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781


                   
                                                        

























                                                                         
                                                    




                                                


                                                                    














                                                                        
                                                                    
                                  




                                                         
                                                   
























                                                                            
                                   



                                     
                                         
 
         
                     
                             
            















                                                                        
                                                    

        


            





                         
                                     
           

                                    
           
 









































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                
                                                            


















































                                                                             

                                                                 
                                                           
                                  






























































































































































































































































































                                                                               
                                                                          
                                                  
                                                                        















































































                                                                         
                                                                          
                                          
                                                                       

                                                 
                                                        


                                
                                                                          
                                                 
                                                                              

                                                        
                                                               


































































































































































                                                                           
                                                                          
                                             
                                                              
                                       
                                                          
                                   
                                                                          

                                                    
                                                        

















































































                                                                           
                                                                          










































                                                                           
                                                                     
                                             
                                                                  
                                          
                                                                   
                                           

                                                                 


                                                         
                                                                    
                                             
                                                                      
                                               
                                                             
                                      
                                                               
                                        
                                                                   


                                                    
                                                                    
                                        
                                                                
                                         
                                                                  


                                             
                                                                


                                         
                                                            


                                    
                                                                


                                         
                                                                             
                                                      
                                                                    
                                             
                                                                               
                                                        
                                                                      
                                               
                                                                          


                                                     
                                                             
                                     
                                                              
                                       
                                                              







                                               
                                                                          


                                                 
                                                                          



                                                  
                                                                          
                                                    
                                                                      


                                              
                                                                          
                                                                
                                                                          
                                                             
                                                                          







                                                             
                                                                      
                                                           
                                                                      



                                                               
                                                                 




















































































































































































































































































































































































































































































































































































































                                                                               






















                                                                   



























                                                                     







































































































































                                                                           




                                               




































































































                                                                      
                                                                    















































































































































































































































































































































































































































































































































                                                                              
























                                                                     






















                                                                      
































                                                                        





















                                                                    







                                                 
                                                   














































































































































                                                                               
                                                   























































































































































































































































































                                                                             
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1996-2011. All Rights Reserved.
%% 
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%
-module(dets_SUITE).

%-define(debug, true).

-ifdef(debug).
-define(format(S, A), io:format(S, A)).
-define(line, put(line, ?LINE), ).
-define(config(X,Y), foo).
-define(t, test_server).
-define(privdir(_), "./dets_SUITE_priv").
-define(datadir(_), "./dets_SUITE_data").
-else.
-include_lib("test_server/include/test_server.hrl").
-define(format(S, A), ok).
-define(privdir(Conf), ?config(priv_dir, Conf)).
-define(datadir(Conf), ?config(data_dir, Conf)).
-endif.

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
	 init_per_group/2,end_per_group/2, 
	 not_run/1, newly_started/1, basic_v8/1, basic_v9/1,
	 open_v8/1, open_v9/1, sets_v8/1, sets_v9/1, bags_v8/1,
	 bags_v9/1, duplicate_bags_v8/1, duplicate_bags_v9/1,
	 access_v8/1, access_v9/1, dirty_mark/1, dirty_mark2/1,
	 bag_next_v8/1, bag_next_v9/1, oldbugs_v8/1, oldbugs_v9/1,
	 unsafe_assumptions/1, truncated_segment_array_v8/1,
	 truncated_segment_array_v9/1, open_file_v8/1, open_file_v9/1,
	 init_table_v8/1, init_table_v9/1, repair_v8/1, repair_v9/1,
	 hash_v8b_v8c/1, phash/1, fold_v8/1, fold_v9/1, fixtable_v8/1,
	 fixtable_v9/1, match_v8/1, match_v9/1, select_v8/1,
	 select_v9/1, update_counter/1, badarg/1, cache_sets_v8/1,
	 cache_sets_v9/1, cache_bags_v8/1, cache_bags_v9/1,
	 cache_duplicate_bags_v8/1, cache_duplicate_bags_v9/1,
	 otp_4208/1, otp_4989/1, many_clients/1, otp_4906/1, otp_5402/1,
         simultaneous_open/1, insert_new/1, repair_continuation/1,
         otp_5487/1, otp_6206/1, otp_6359/1, otp_4738/1, otp_7146/1,
         otp_8070/1, otp_8856/1, otp_8898/1, otp_8899/1, otp_8903/1,
         otp_8923/1, otp_9282/1]).

-export([dets_dirty_loop/0]).

-export([histogram/1, sum_histogram/1, ave_histogram/1]).

-export([init_per_testcase/2, end_per_testcase/2]).

%% Internal export.
-export([client/2]).

-import(lists, 
	[append/1, delete/2, duplicate/2, filter/2, foreach/2, keysearch/3, 
	 last/1, map/2, member/2, reverse/1, seq/2, sort/1, usort/1]).

-include_lib("kernel/include/file.hrl").

-define(DETS_SERVER, dets).

%% HEADSZ taken from dets_v8.erl and dets_v9.erl.
-define(HEADSZ_v8, 40).
-define(HEADSZ_v9, (56+28*4+16)).
-define(NO_KEYS_POS_v9, 36).
-define(CLOSED_PROPERLY_POS, 8).

-define(NOT_PROPERLY_CLOSED,0).
-define(CLOSED_PROPERLY,1).

init_per_testcase(_Case, Config) ->
    Dog=?t:timetrap(?t:minutes(15)),
    [{watchdog, Dog}|Config].

end_per_testcase(_Case, _Config) ->
    Dog=?config(watchdog, _Config),
    test_server:timetrap_cancel(Dog),
    ok.

suite() -> [{ct_hooks,[ts_install_cth]}].

all() -> 
    case os:type() of
	vxworks -> [not_run];
	_ ->
	    [basic_v8, basic_v9, open_v8, open_v9, sets_v8, sets_v9,
	     bags_v8, bags_v9, duplicate_bags_v8, duplicate_bags_v9,
	     newly_started, open_file_v8, open_file_v9,
	     init_table_v8, init_table_v9, repair_v8, repair_v9,
	     access_v8, access_v9, oldbugs_v8, oldbugs_v9,
	     unsafe_assumptions, truncated_segment_array_v8,
	     truncated_segment_array_v9, dirty_mark, dirty_mark2,
	     bag_next_v8, bag_next_v9, hash_v8b_v8c, phash, fold_v8,
	     fold_v9, fixtable_v8, fixtable_v9, match_v8, match_v9,
	     select_v8, select_v9, update_counter, badarg,
	     cache_sets_v8, cache_sets_v9, cache_bags_v8,
	     cache_bags_v9, cache_duplicate_bags_v8,
	     cache_duplicate_bags_v9, otp_4208, otp_4989,
	     many_clients, otp_4906, otp_5402, simultaneous_open,
	     insert_new, repair_continuation, otp_5487, otp_6206,
	     otp_6359, otp_4738, otp_7146, otp_8070, otp_8856, otp_8898,
	     otp_8899, otp_8903, otp_8923, otp_9282]
    end.

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
    Config.

end_per_group(_GroupName, Config) ->
    Config.

not_run(suite) -> [];
not_run(Conf) when is_list(Conf) ->
    {comment, "Not runnable VxWorks/NFS"}.

newly_started(doc) ->
    ["OTP-3621"];
newly_started(suite) -> 
    [];
newly_started(Config) when is_list(Config) ->
    ?line true = is_alive(),
    ?line {ok, Node} = test_server:start_node(slave1, slave, []),
    ?line [] = rpc:call(Node, dets, all, []),
    ?line test_server:stop_node(Node),
    ok.

basic_v8(doc) ->
    ["Basic test case."];
basic_v8(suite) -> 
    [];
basic_v8(Config) when is_list(Config) ->
    basic(Config, 8).

basic_v9(doc) ->
    ["Basic test case."];
basic_v9(suite) -> 
    [];
basic_v9(Config) when is_list(Config) ->
    basic(Config, 9).

basic(Config, Version) ->
    ?line Tab = dets_basic_test,
    ?line FName = filename(Tab, Config),

    P0 = pps(),
    ?line {ok, _} = dets:open_file(Tab,[{file, FName},{version,Version}]),
    ?line ok = dets:insert(Tab,{mazda,japan}),
    ?line ok = dets:insert(Tab,{toyota,japan}),
    ?line ok = dets:insert(Tab,{suzuki,japan}),
    ?line ok = dets:insert(Tab,{honda,japan}),
    ?line ok = dets:insert(Tab,{renault,france}),
    ?line ok = dets:insert(Tab,{citroen,france}),
    ?line ok = dets:insert(Tab,{opel,germany}),
    ?line ok = dets:insert(Tab,{saab,sweden}),
    ?line ok = dets:insert(Tab,{volvo,sweden}),
    ?line [{opel,germany}] = dets:lookup(Tab,opel),
    ?line Japs = dets:traverse(Tab, fun(Obj) -> 
					   case Obj of 
					       {_, japan} -> {continue, Obj};
					       _ -> continue
					   end
				    end),
    ?line 4  = length(Japs),
    ?line ok = dets:close(Tab),
    ?line file:delete(FName),
    ?line check_pps(P0),
    ok.
    

open_v8(doc) ->
    [];
open_v8(suite) -> 
    [];
open_v8(Config) when is_list(Config) ->
    open(Config, 8).

open_v9(doc) ->
    [];
open_v9(suite) -> 
    [];
open_v9(Config) when is_list(Config) ->
    open(Config, 9).

open(Config, Version) ->
    %% Running this test twice means that the Dets server is restarted
    %% twice. dets_sup specifies a maximum of 4 restarts in an hour.
    %% If this becomes a problem, one should consider running this
    %% test on a slave node.

    ?line {Sets, Bags, Dups} = args(Config),
    
    ?line All = Sets ++ Bags ++ Dups,
    ?line delete_files(All),

    ?line Data = make_data(1),

    P0 = pps(),
    ?line Tabs = open_files(1, All, Version),
    ?line initialize(Tabs, Data),
    ?line check(Tabs, Data),

    ?line foreach(fun(Tab) -> ok = dets:close(Tab) end, Tabs),
    %% Now reopen the files
    ?format("Reopening closed files \n", []),
    ?line Tabs = open_files(1, All, Version),
    ?format("Checking contents of reopened files \n", []),
    ?line check(Tabs, Data),
    %% crash the dets server

    ?format("Crashing dets server \n", []),
    process_flag(trap_exit, true),
    Procs = [whereis(?DETS_SERVER) | map(fun(Tab) -> dets:info(Tab, pid) end,
				 Tabs)],
    foreach(fun(Pid) -> exit(Pid, kill) end, Procs),
    timer:sleep(100),
    c:flush(),  %% flush all the EXIT sigs
    timer:sleep(200),

    %% Now reopen the files again
    ?format("Reopening crashed files \n", []),
    ?line open_files(1, All, Version),
    ?format("Checking contents of repaired files \n", []),
    ?line check(Tabs, Data),
    
    ?line close_all(Tabs),

    ?line delete_files(All),
    P1 = pps(),
    {Ports0, Procs0} = P0,
    {Ports1, Procs1} = P1,
    ?line true = Ports1 =:= Ports0,
    %% The dets_server process has been restarted:
    ?line [_] = Procs0 -- Procs1,
    ?line [_] = Procs1 -- Procs0,
    ok.
    
check(Tabs, Data) ->
    foreach(fun(Tab) ->
		    ?line Kp = dets:info(Tab, keypos), 
		    ?format("checking ~p~n", [Tab]),
		    foreach(fun(Item) ->
				    case dets:lookup(Tab, k(Kp,Item)) of
					[Item] -> ok;
					_Other -> bad(Tab,Item)
				    end
			    end, Data)
	    end, Tabs),
    ok.
    
k(Kp, Obj) -> element(Kp, Obj).

bad(_Tab, _Item) ->
    ?format("Can't find item ~p in ~p ~n", [_Item, _Tab]),
    exit(badtab).

sets_v8(doc) ->
    ["Performs traversal and match testing on set type dets tables."];
sets_v8(suite) ->
    [];
sets_v8(Config) when is_list(Config) ->
    sets(Config, 8).

sets_v9(doc) ->
    ["Performs traversal and match testing on set type dets tables."];
sets_v9(suite) ->
    [];
sets_v9(Config) when is_list(Config) ->
    sets(Config, 9).

sets(Config, Version) ->
    ?line {Sets, _, _} = args(Config),

    ?line Data = make_data(1),
    ?line delete_files(Sets),
    P0 = pps(),
    ?line Tabs = open_files(1, Sets, Version),
    Bigger = [{17,q,w,w}, {48,q,w,w,w,w,w,w}], % 48 requires a bigger buddy
    ?line initialize(Tabs, Data++Bigger++Data), % overwrite
    ?line Len = length(Data),
    ?line foreach(fun(Tab) -> trav_test(Data, Len, Tab) end, Tabs),
    ?line size_test(Len, Tabs),
    ?line no_keys_test(Tabs),
    ?line foreach(fun(Tab) -> del_test(Tab) end, Tabs),
    ?line initialize(Tabs, Data),
    ?line foreach(fun(Tab) -> del_obj_test(Tab) end, Tabs),
    ?line initialize(Tabs, Data),
    ?line foreach(fun(Tab) ->
			  Len = dets:info(Tab, size) end, 
		  Tabs),
    ?line foreach(fun(Tab) -> match_test(Data, Tab) end, Tabs),
    ?line foreach(fun(Tab) -> match_del_test(Tab) end, Tabs),
    
    ?line close_all(Tabs),
    ?line delete_files(Sets),
    ?line check_pps(P0),
    ok.

bags_v8(doc) ->
    ["Performs traversal and match testing on bag type dets tables."];
bags_v8(suite) ->
    [];
bags_v8(Config) when is_list(Config) ->
    bags(Config, 8).

bags_v9(doc) ->
    ["Performs traversal and match testing on bag type dets tables."];
bags_v9(suite) ->
    [];
bags_v9(Config) when is_list(Config) ->
    bags(Config, 9).

bags(Config, Version) ->
    {_, Bags, _} = args(Config),
    ?line Data = make_data(1, bag),  %% gives twice as many objects
    ?line delete_files(Bags),
    P0 = pps(),
    ?line Tabs = open_files(1, Bags, Version),
    ?line initialize(Tabs, Data++Data),
    ?line Len = length(Data),
    ?line foreach(fun(Tab) -> trav_test(Data, Len, Tab) end, Tabs),
    ?line size_test(Len, Tabs),
    ?line no_keys_test(Tabs),
    ?line foreach(fun(Tab) -> del_test(Tab) end, Tabs),
    ?line initialize(Tabs, Data),
    ?line foreach(fun(Tab) -> del_obj_test(Tab) end, Tabs),
    ?line initialize(Tabs, Data),
    ?line foreach(fun(Tab) ->
			  Len = dets:info(Tab, size) end, 
		  Tabs),
    ?line foreach(fun(Tab) -> match_test(Data, Tab) end, Tabs),
    ?line foreach(fun(Tab) -> match_del_test(Tab) end, Tabs),
    ?line close_all(Tabs),
    ?line delete_files(Bags),
    ?line check_pps(P0),
    ok.


duplicate_bags_v8(doc) ->
   ["Performs traversal and match testing on duplicate_bag type dets tables."];
duplicate_bags_v8(suite) ->
    [];
duplicate_bags_v8(Config) when is_list(Config) ->
    duplicate_bags(Config, 8).

duplicate_bags_v9(doc) ->
   ["Performs traversal and match testing on duplicate_bag type dets tables."];
duplicate_bags_v9(suite) ->
    [];
duplicate_bags_v9(Config) when is_list(Config) ->
    duplicate_bags(Config, 9).

duplicate_bags(Config, Version) when is_list(Config) ->
    {_, _, Dups} = args(Config),
    ?line Data = make_data(1, duplicate_bag), %% gives twice as many objects
    ?line delete_files(Dups),
    P0 = pps(),
    ?line Tabs = open_files(1, Dups, Version),
    ?line initialize(Tabs, Data),
    ?line Len = length(Data),
    ?line foreach(fun(Tab) -> trav_test(Data, Len, Tab) end, Tabs),
    ?line size_test(Len, Tabs),
    ?line no_keys_test(Tabs),
    ?line foreach(fun(Tab) -> del_test(Tab) end, Tabs),
    ?line initialize(Tabs, Data),
    ?line foreach(fun(Tab) -> del_obj_test(Tab) end, Tabs),
    ?line initialize(Tabs, Data),
    ?line foreach(fun(Tab) ->
			  Len = dets:info(Tab, size) end, 
		  Tabs),
    ?line foreach(fun(Tab) -> match_test(Data, Tab) end, Tabs),
    ?line foreach(fun(Tab) -> match_del_test(Tab) end, Tabs),
    ?line close_all(Tabs),
    ?line delete_files(Dups),
    ?line check_pps(P0),
    ok.


access_v8(doc) ->
    [];
access_v8(suite) ->
    [];
access_v8(Config) when is_list(Config) ->
    access(Config, 8).

access_v9(doc) ->
    [];
access_v9(suite) ->
    [];
access_v9(Config) when is_list(Config) ->
    access(Config, 9).

access(Config, Version) ->
    Args_acc = [[{ram_file, true}, {access, read}],
		[{access, read}]],
    Args = [[{ram_file, true}],
	    []],
    
    ?line {Args_acc_1, _, _} = zip_filename(Args_acc, [], [], Config),
    ?line delete_files(Args_acc_1),
    ?line {Args_1, _, _} = zip_filename(Args, [], [], Config),

    P0 = pps(),
    ?line {error, {file_error,_,enoent}} = dets:open_file('1', hd(Args_acc_1)),

    ?line Tabs = open_files(1, Args_1, Version),
    ?line close_all(Tabs),
    ?line Tabs = open_files(1, Args_acc_1, Version),

    ?line foreach(fun(Tab) ->
			  {error, {access_mode,_}} = dets:insert(Tab, {1,2}),
			  [] = dets:lookup(Tab, 11),
			  '$end_of_table' = dets:first(Tab),
			  {error, {access_mode,_}} = dets:delete(Tab, 22)
		  end, Tabs),
    ?line close_all(Tabs),
    ?line delete_files(Args_acc_1),
    ?line check_pps(P0),
    ok.


dirty_mark(doc) ->
    ["Test that the table is not marked dirty if not written"];
dirty_mark(suite) ->
    [];
dirty_mark(Config) when is_list(Config) ->
    ?line true = is_alive(),
    ?line Tab = dets_dirty_mark_test,
    ?line FName = filename(Tab, Config),
    P0 = pps(),
    ?line dets:open_file(Tab,[{file, FName}]),
    ?line dets:insert(Tab,{mazda,japan}),
    ?line dets:insert(Tab,{toyota,japan}),
    ?line dets:insert(Tab,{suzuki,japan}),
    ?line dets:insert(Tab,{honda,japan}),
    ?line dets:insert(Tab,{renault,france}),
    ?line dets:insert(Tab,{citroen,france}),
    ?line dets:insert(Tab,{opel,germany}),
    ?line dets:insert(Tab,{saab,sweden}),
    ?line dets:insert(Tab,{volvo,sweden}),
    ?line [{opel,germany}] = dets:lookup(Tab,opel),
    ?line ok = dets:close(Tab),
    ?line Call = fun(P,A) ->
		   P ! {self(), A},
		   receive
		       {P, Ans} ->
			   Ans
		   after 5000 ->
			   exit(other_process_dead)
		   end
	   end,
    ?line {ok, Node} = test_server:start_node(dets_dirty_mark, 
					      slave,
					      [{linked, false},
					       {args, "-pa " ++ 
					       filename:dirname
						(code:which(?MODULE))}]),
    ?line ok = ensure_node(20, Node),
    %% io:format("~p~n",[rpc:call(Node, code, get_path, [])]),
    %% io:format("~p~n",[rpc:call(Node, file, get_cwd, [])]),
    %% io:format("~p~n",[Config]),
    ?line Pid = rpc:call(Node,erlang, spawn, 
			 [?MODULE, dets_dirty_loop, []]),
    ?line {ok, Tab} = Call(Pid, [open, Tab, [{file, FName}]]),
    ?line [{opel,germany}] = Call(Pid, [read,Tab,opel]),
    ?line test_server:stop_node(Node),
    ?line {ok, Tab} = dets:open_file(Tab,[{file, FName}, 
					  {repair,false}]),
    ?line ok = dets:close(Tab),
    ?line file:delete(FName),
    ?line check_pps(P0),
    ok.

dirty_mark2(doc) ->
    ["Test that the table is flushed when auto_save is in effect"];
dirty_mark2(suite) ->
    [];
dirty_mark2(Config) when is_list(Config) ->
    ?line true = is_alive(),
    ?line Tab = dets_dirty_mark2_test,
    ?line FName = filename(Tab, Config),
    P0 = pps(),
    ?line dets:open_file(Tab,[{file, FName}]),
    ?line dets:insert(Tab,{toyota,japan}),
    ?line dets:insert(Tab,{suzuki,japan}),
    ?line dets:insert(Tab,{honda,japan}),
    ?line dets:insert(Tab,{renault,france}),
    ?line dets:insert(Tab,{citroen,france}),
    ?line dets:insert(Tab,{opel,germany}),
    ?line dets:insert(Tab,{saab,sweden}),
    ?line dets:insert(Tab,{volvo,sweden}),
    ?line [{opel,germany}] = dets:lookup(Tab,opel),
    ?line ok = dets:close(Tab),
    ?line Call = fun(P,A) ->
		   P ! {self(), A},
		   receive
		       {P, Ans} ->
			   Ans
		   after 5000 ->
			   exit(other_process_dead)
		   end
	   end,
    ?line {ok, Node} = test_server:start_node(dets_dirty_mark2, 
					      slave,
					      [{linked, false},
					       {args, "-pa " ++ 
					       filename:dirname
						(code:which(?MODULE))}]),
    ?line ok = ensure_node(20, Node),
    ?line Pid = rpc:call(Node,erlang, spawn, 
			 [?MODULE, dets_dirty_loop, []]),
    ?line {ok, Tab} = Call(Pid, [open, Tab, [{file, FName},{auto_save,1000}]]),
    ?line ok = Call(Pid, [write,Tab,{mazda,japan}]),
    ?line timer:sleep(2100),
    %% Read something, just to give auto save time to finish.
    ?line [{opel,germany}] = Call(Pid, [read,Tab,opel]),
    ?line test_server:stop_node(Node),
    ?line {ok, Tab} = dets:open_file(Tab, [{file, FName}, {repair,false}]),
    ?line ok = dets:close(Tab),
    ?line file:delete(FName),
    ?line check_pps(P0),
    ok.

dets_dirty_loop() ->
    receive 
	{From, [open, Name, Args]} ->
	    Ret = dets:open_file(Name, Args),
	    From ! {self(), Ret},
	    dets_dirty_loop();
	{From, [read, Name, Key]} ->
	    Ret = dets:lookup(Name, Key),
	    From ! {self(), Ret},
	    dets_dirty_loop();
	{From, [write, Name, Value]} ->
	    Ret = dets:insert(Name, Value),
	    From ! {self(), Ret},
	    dets_dirty_loop()
    end.


bag_next_v8(suite) ->
    [];
bag_next_v8(doc) ->
    ["Check that bags and next work as expected."];
bag_next_v8(Config) when is_list(Config) ->
    bag_next(Config, 8).

bag_next_v9(suite) ->
    [];
bag_next_v9(doc) ->
    ["Check that bags and next work as expected."];
bag_next_v9(Config) when is_list(Config) ->
    ?line Tab = dets_bag_next_test,
    ?line FName = filename(Tab, Config),

    %% first and next crash upon error
    ?line dets:open_file(Tab,[{file, FName}, {type, bag},{version,9}]),
    ?line ok = dets:insert(Tab, [{1,1},{2,2},{3,3},{4,4}]),
    ?line FirstKey = dets:first(Tab),
    ?line NextKey = dets:next(Tab, FirstKey),
    ?line [FirstObj | _] = dets:lookup(Tab, FirstKey),
    ?line [NextObj | _] = dets:lookup(Tab, NextKey),
    ?line {ok, FirstPos} = dets:where(Tab, FirstObj),
    ?line {ok, NextPos} = dets:where(Tab, NextObj),
    crash(FName, NextPos+12),
    ?line {'EXIT',BadObject1} = (catch dets:next(Tab, FirstKey)),
    ?line bad_object(BadObject1, FName),
    crash(FName, FirstPos+12),
    ?line {'EXIT',BadObject2} = (catch dets:first(Tab)),
    ?line bad_object(BadObject2, FName),
    ?line dets:close(Tab),
    ?line file:delete(FName),

    bag_next(Config, 9).

bag_next(Config, Version) ->
    ?line Tab = dets_bag_next_test,
    ?line FName = filename(Tab, Config),
    P0 = pps(),
    ?line dets:open_file(Tab,[{file, FName}, {type, bag},{version,Version}]),
    ?line dets:insert(Tab,{698,hopp}),
    ?line dets:insert(Tab,{186,hopp}),
    ?line dets:insert(Tab,{hej,hopp}),
    ?line dets:insert(Tab,{186,plopp}),
    Loop = fun(N, Last, Self) ->
		   case N of
		       0 ->
			   exit({unterminated_first_next_sequence, N, Last});
		       _ ->
			   case Last of
			       '$end_of_table' ->
				   ok;
			       _ ->
				   Self(N-1, dets:next(Tab,Last), Self)
			   end
		   end
	   end,
    ?line ok = Loop(4,dets:first(Tab),Loop),
    ?line dets:close(Tab),
    ?line file:delete(FName),
    ?line check_pps(P0),
    ok.

oldbugs_v8(doc) ->
    [];
oldbugs_v8(suite) ->
    [];
oldbugs_v8(Config) when is_list(Config) ->
    oldbugs(Config, 8).

oldbugs_v9(doc) ->
    [];
oldbugs_v9(suite) ->
    [];
oldbugs_v9(Config) when is_list(Config) ->
    oldbugs(Config, 9).

oldbugs(Config, Version) ->
    FName = filename(dets_suite_oldbugs_test, Config),
    P0 = pps(),
    ?line {ok, ob} = dets:open_file(ob, [{version, Version},
					 {type, bag}, {file, FName}]),
    ?line ok = dets:insert(ob, {1, 2}),
    ?line ok = dets:insert(ob, {1,3}),
    ?line ok = dets:insert(ob, {1, 2}),
    ?line 2 = dets:info(ob, size),  %% assertion
    ?line ok = dets:close(ob),
    ?line file:delete(FName),
    ?line check_pps(P0),
    ok.

unsafe_assumptions(suite) -> [];
unsafe_assumptions(doc) ->
    "Tests that shrinking an object and then expanding it works.";
unsafe_assumptions(Config) when is_list(Config) ->
    FName = filename(dets_suite_unsafe_assumptions_test, Config),
    ?line file:delete(FName),
    P0 = pps(),
    ?line {ok, a} = dets:open_file(a, [{version,8},{file, FName}]),
    O0 = {2,false},
    O1 = {1, false},
    O2 = {1, true},
    O3 = {1, duplicate(20,false)},
    O4 = {1, duplicate(25,false)}, % same 2-log as O3
    ?line ok = dets:insert(a, O1),
    ?line ok = dets:insert(a, O0),
    ?line true = [O1,O0] =:= sort(get_all_objects(a)),
    ?line true = [O1,O0] =:= sort(get_all_objects_fast(a)),
    ?line ok = dets:insert(a, O2),
    ?line true = [O2,O0] =:= sort(get_all_objects(a)),
    ?line true = [O2,O0] =:= sort(get_all_objects_fast(a)),
    ?line ok = dets:insert(a, O3),
    ?line true = [O3,O0] =:= sort(get_all_objects(a)),
    ?line true = [O3,O0] =:= sort(get_all_objects_fast(a)),
    ?line ok = dets:insert(a, O4),
    ?line true = [O4,O0] =:= sort(get_all_objects(a)),
    ?line true = [O4,O0] =:= sort(get_all_objects_fast(a)),
    ?line ok = dets:close(a),
    ?line file:delete(FName),
    ?line check_pps(P0),
    ok.

truncated_segment_array_v8(suite) -> [];
truncated_segment_array_v8(doc) ->
    "Tests that a file where the segment array has been truncated "
    "is possible to repair.";
truncated_segment_array_v8(Config) when is_list(Config) ->
    trunc_seg_array(Config, 8).

truncated_segment_array_v9(suite) -> [];
truncated_segment_array_v9(doc) ->
    "Tests that a file where the segment array has been truncated "
    "is possible to repair.";
truncated_segment_array_v9(Config) when is_list(Config) ->
    trunc_seg_array(Config, 9).

trunc_seg_array(Config, V) ->
    TabRef = dets_suite_truncated_segment_array_test,
    Fname = filename(TabRef, Config),
    %% Create file that needs to be repaired
    ?line file:delete(Fname),
    P0 = pps(),
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file, Fname},{version,V}]),
    ?line ok = dets:close(TabRef),
    
    %% Truncate the file
    ?line HeadSize = headsz(V),
    ?line truncate(Fname, HeadSize + 10),
    
    %% Open the truncated file
    ?line io:format("Expect repair:~n"),
    ?line {ok, TabRef} = dets:open_file(TabRef, 
					[{file, Fname}, {repair, true}]),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),
    ?line check_pps(P0),
    ok.

open_file_v8(doc) ->
    ["open_file/1 test case."];
open_file_v8(suite) -> 
    [];
open_file_v8(Config) when is_list(Config) ->
    open_1(Config, 8).

open_file_v9(doc) ->
    ["open_file/1 test case."];
open_file_v9(suite) -> 
    [];
open_file_v9(Config) when is_list(Config) ->
    T = open_v9,
    Fname = filename(T, Config),
    ?line {ok, _} = dets:open_file(T, [{file,Fname},{version,9}]),
    ?line 9 = dets:info(T, version),
    ?line true = [self()] =:= dets:info(T, users),
    ?line {ok, _} = dets:open_file(T, [{file,Fname},{version,9}]),
    ?line {error,incompatible_arguments} = 
	dets:open_file(T, [{file,Fname},{version,8}]),
    ?line true = [self(),self()] =:= dets:info(T, users),
    ?line ok = dets:close(T),
    ?line true = [self()] =:= dets:info(T, users),
    ?line ok = dets:close(T),
    ?line undefined = ets:info(T, users),
    ?line file:delete(Fname),

    open_1(Config, 9).

open_1(Config, V) ->
    TabRef = open_file_1_test,
    Fname = filename(TabRef, Config),
    ?line file:delete(Fname),

    P0 = pps(),
    ?line {error,{file_error,Fname,enoent}} = dets:open_file(Fname),
    
    ?line ok = file:write_file(Fname, duplicate(100,65)),
    ?line {error,{not_a_dets_file,Fname}} = dets:open_file(Fname),
    ?line file:delete(Fname),

    HeadSize = headsz(V),
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file, Fname},{version,V}]),
    ?line ok = dets:close(TabRef),
    ?line truncate(Fname, HeadSize + 10),
    ?line true = dets:is_dets_file(Fname),
    ?line io:format("Expect repair:~n"),
    ?line {ok, Ref} = dets:open_file(Fname), % repairing
    ?line ok = dets:close(Ref),
    ?line file:delete(Fname),

    %% truncated file header, invalid type
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = ins(TabRef, 3000),
    ?line ok = dets:close(TabRef),
    TypePos = 12,
    crash(Fname, TypePos),
    ?line {error, {invalid_type_code,Fname}} = dets:open_file(Fname),
    ?line truncate(Fname, HeadSize - 10),    
    ?line {error, {tooshort,Fname}} = dets:open_file(Fname),
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {error,{file_error,{foo,bar},_}} = dets:is_dets_file({foo,bar}),
    ?line check_pps(P0),
    ok.

init_table_v8(doc) ->
    ["initialize_table/2 and from_ets/2 test case."];
init_table_v8(suite) -> 
    [];
init_table_v8(Config) when is_list(Config) ->
    init_table(Config, 8).

init_table_v9(doc) ->
    ["initialize_table/2 and from_ets/2 test case."];
init_table_v9(suite) -> 
    [];
init_table_v9(Config) when is_list(Config) ->
    %% Objects are returned in "time order".
    T = init_table_v9,
    Fname = filename(T, Config),
    ?line file:delete(Fname),
    L = [{1,a},{2,b},{1,c},{2,c},{1,c},{2,a},{1,b}],
    Input = init([L]),
    ?line {ok, _} = dets:open_file(T, [{file,Fname},{version,9},
				       {type,duplicate_bag}]),
    ?line ok = dets:init_table(T, Input),
    ?line [{1,a},{1,c},{1,c},{1,b}] = dets:lookup(T, 1),
    ?line [{2,b},{2,c},{2,a}] = dets:lookup(T, 2),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    init_table(Config, 9),
    fast_init_table(Config).

init_table(Config, V) ->
    TabRef = init_table_test,
    Fname = filename(TabRef, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    Args = [{file,Fname},{version,V},{auto_save,120000}],
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {'EXIT', _} = 
	(catch dets:init_table(TabRef, fun(foo) -> bar end)),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {'EXIT', _} = (catch dets:init_table(TabRef, fun() -> foo end)),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {'EXIT', {badarg, _}} = (catch dets:init_table(TabRef, nofun)),
    ?line {'EXIT', {badarg, _}} = 
	(catch dets:init_table(TabRef, fun(_X) -> end_of_input end, 
			       [{foo,bar}])),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line away = (catch dets:init_table(TabRef, fun(_) -> throw(away) end)),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {error, {init_fun, fopp}} = 
	dets:init_table(TabRef, fun(read) -> fopp end),
    dets:close(TabRef),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line dets:safe_fixtable(TabRef, true),
    ?line {error, {fixed_table, TabRef}} = dets:init_table(TabRef, init([])),
    ?line dets:safe_fixtable(TabRef, false),
    ?line ET = ets:new(foo,[]),
    ?line ok = dets:from_ets(TabRef, ET),
    ?line [] = get_all_objects(TabRef),
    ?line [] = get_all_objects_fast(TabRef),
    ?line true = ets:insert(ET, {1,a}),
    ?line true = ets:insert(ET, {2,b}),
    ?line ok = dets:from_ets(TabRef, ET),
    ?line [{1,a},{2,b}] = sort(get_all_objects(TabRef)),
    ?line [{1,a},{2,b}] = sort(get_all_objects_fast(TabRef)),
    ?line true = ets:delete(ET),
    ?line 120000 = dets:info(TabRef, auto_save),
    ?line ok = dets:close(TabRef),

    ?line {ok, _} = dets:open_file(TabRef, [{access,read} | Args]),
    ?line {error, {access_mode, Fname}} = dets:init_table(TabRef, init([])),
    ?line ok = dets:close(TabRef),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {error, invalid_objects_list} =
	(catch dets:init_table(TabRef, init([[{1,2},bad,{3,4}]]))),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    L1 = [[{1,a},{2,b}],[],[{3,c}],[{4,d}],[]],
    bulk_init(L1, set, 4, Config, V),
    L2 = [[{1,a},{2,b}],[],[{2,q},{3,c}],[{4,d}],[{4,e},{2,q}]],
    bulk_init(L2, set, 4, Config, V),
    bulk_init(L2, bag, 6, Config, V),
    bulk_init(L2, duplicate_bag, 7, Config, V),
    bulk_init(L1, set, 4, 512, Config, V),
    bulk_init([], set, 0, 10000, Config, V),
    file:delete(Fname),

    %% Initiate a file that contains a lot of objects.
    ?line {ok, _} = dets:open_file(TabRef, [{min_no_slots,10000} | Args]),
    ?line ok = ins(TabRef, 6000),
    Fun = init_fun(0, 10000),
    ?line ok = dets:init_table(TabRef, Fun,{format,term}),
    ?line All = sort(get_all_objects(TabRef)),
    ?line FAll = get_all_objects_fast(TabRef),
    ?line true = All =:= sort(FAll),
    ?line true = length(All) =:= 10000,
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, [{min_no_slots,4000} | Args]),
    ?line ok = ins(TabRef, 6000),
    ?line FileSize1 = dets:info(TabRef, file_size),
    Fun2 = init_fun(0, 4000),
    ?line ok = dets:init_table(TabRef, Fun2),
    ?line FileSize2 = dets:info(TabRef, file_size),
    ?line ok = dets:close(TabRef),
    ?line true = FileSize1 > FileSize2,
    ?line file:delete(Fname),

    ?line check_pps(P0),
    ok.

bulk_init(Ls, Type, N, Config, V) ->
    bulk_init(Ls, Type, N, 256, Config, V).

bulk_init(Ls, Type, N, Est, Config, V) ->
    T = init_table_test,
    Fname = filename(T, Config),
    ?line file:delete(Fname),
    Input = init(Ls),
    Args = [{ram_file,false}, {type,Type},{keypos,1},{file,Fname},
	    {estimated_no_objects, Est},{version,V}],
    ?line {ok, T} = dets:open_file(T, Args),
    ?line ok = dets:init_table(T, Input),
    ?line All = sort(get_all_objects(T)),
    ?line FAll = get_all_objects_fast(T),
    ?line true = All =:= sort(FAll),
    ?line true = length(All) =:= N,
    ?line true = dets:info(T, size) =:= N,
    ?line ok = dets:close(T),
    
    ?line {ok, T} = dets:open_file(T, Args),
    ?line All2 = sort(get_all_objects(T)),
    ?line FAll2 = get_all_objects_fast(T),
    ?line true = All =:= All2,
    ?line true = All =:= sort(FAll2),
    ?line ok = dets:close(T),
    ?line file:delete(Fname).

init(L) ->
    fun(close) ->
	    ok;
       (read) when [] =:= L ->
	    end_of_input;
       (read) ->
	    [E | Es] = L,
	    {E, init(Es)}
    end.

init_fun(I, N) ->
    fun(read) when I =:= N ->
	    end_of_input;
       (read) ->
	    {NewN, Items} = items(I, N, 1000, []),
	    {Items, init_fun(NewN, N)};
       (close) ->
	    ignored
    end.

fast_init_table(Config) ->
    V = 9,
    TabRef = init_table_test,
    Fname = filename(TabRef, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    Args = [{file,Fname},{version,V},{auto_save,120000}],

    Source = init_table_test_source,
    SourceFname = filename(Source, Config),
    ?line file:delete(SourceFname),
    SourceArgs = [{file,SourceFname},{version,V},{auto_save,120000}],

    ?line {ok, Source} = dets:open_file(Source, SourceArgs),
    
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {'EXIT', _} = 
	(catch dets:init_table(TabRef, fun(foo) -> bar end, {format,bchunk})),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {'EXIT', _} = (catch dets:init_table(TabRef, fun() -> foo end,
					       {format,bchunk})),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {'EXIT', {badarg, _}} = 
	(catch dets:init_table(TabRef, nofun, {format,bchunk})),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line away = (catch dets:init_table(TabRef, fun(_) -> throw(away) end,
					{format,bchunk})),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {error, {init_fun, fopp}} = 
	dets:init_table(TabRef, fun(read) -> fopp end, {format,bchunk}),
    dets:close(TabRef),
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line dets:safe_fixtable(TabRef, true),
    ?line {error, {fixed_table, TabRef}} = 
	dets:init_table(TabRef, init([]), {format,bchunk}),
    ?line dets:safe_fixtable(TabRef, false),
    ?line ok = dets:close(TabRef),

    ?line {ok, _} = dets:open_file(TabRef, [{access,read} | Args]),
    ?line {error, {access_mode, Fname}} = 
	dets:init_table(TabRef, init([]), {format,bchunk}),
    ?line ok = dets:close(TabRef),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {error, {init_fun,{1,2}}} =
	dets:init_table(TabRef, init([[{1,2},bad,{3,4}]]), {format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {error, {init_fun, end_of_input}} = 
	dets:init_table(TabRef, init([]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line {'EXIT', {badarg, _}} = 
	(catch dets:init_table(TabRef, init([]),{format,foppla})),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line ok = ins(TabRef, 100),

    ?line [BParms | Objs] = collect_bchunk(TabRef, init_bchunk(TabRef)),
    ?line Parms = binary_to_term(BParms),
    ?line {error, {init_fun, <<"foobar">>}} = 
	dets:init_table(TabRef, init([[<<"foobar">>]]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line Parms1 = setelement(1, Parms, foobar),
    BParms1 = term_to_binary(Parms1),
    ?line {error, {init_fun, BParms1}} = 
	dets:init_table(TabRef, init([[BParms1 | Objs]]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    [{Sz1,No1} | NoColls17] = element(tuple_size(Parms), Parms),
    Parms2 = setelement(tuple_size(Parms), Parms, [{Sz1,No1+1} | NoColls17]),
    BParms2 = term_to_binary(Parms2),
    ?line {error, invalid_objects_list} = 
	dets:init_table(TabRef, init([[BParms2 | Objs]]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line [{LSize1,Slot1,Obj1} | ObjsRest] = Objs,
  
    ?line BadSize = byte_size(Obj1)-1,
    ?line <<BadSizeObj:BadSize/binary,_:1/binary>> = Obj1,
    ?line BadObjs = [{LSize1,Slot1,BadSizeObj} | ObjsRest],
    ?line {error, invalid_objects_list} = 
	dets:init_table(TabRef, init([[BParms | BadObjs]]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line <<Size:32,BigObj0/binary>> = list_to_binary(lists:duplicate(16,Obj1)),
    ?line BigObj = <<(Size*16):32,BigObj0/binary>>,
    ?line BadColl = [BParms, {LSize1+4,Slot1,BigObj} | ObjsRest],
    ?line {error, invalid_objects_list} = 
         dets:init_table(TabRef, init([BadColl]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, Args),
    BadObj = <<"foobar">>,
    ?line {error, invalid_objects_list} = 
	dets:init_table(TabRef, init([[BParms, BadObj]]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(TabRef, [{type,bag} | Args]),
    ?line {error, {init_fun, _}} = 
	dets:init_table(TabRef, init([[BParms]]),{format,bchunk}),
    ?line _ = dets:close(TabRef),
    ?line file:delete(Fname),

    ?line ok = dets:close(Source),
    ?line file:delete(SourceFname),

    L1 = [{1,a},{2,b},{3,c},{4,d}],
    fast_bulk_init(L1, set, 4, 4, Config, V),
    L2 = [{1,a},{2,b},{2,q},{3,c},{4,d},{4,e},{2,q}],
    fast_bulk_init(L2, set, 4, 4, Config, V),
    fast_bulk_init(L2, bag, 6, 4, Config, V),
    fast_bulk_init(L2, duplicate_bag, 7, 4, Config, V),
    fast_bulk_init(L1, set, 4, 4, 512, Config, V),
    fast_bulk_init([], set, 0, 0, 10000, Config, V),
    file:delete(Fname),

    %% Initiate a file that contains a lot of objects.
    ?line {ok, _} = dets:open_file(Source, [{min_no_slots,10000} | SourceArgs]),
    Fun1 = init_fun(0, 10000),
    ?line ok = dets:init_table(Source, Fun1, {format,term}),
    
    ?line {ok, _} = dets:open_file(TabRef, [{min_no_slots,10000} | Args]),
    ?line ok = ins(TabRef, 6000),
    Fun2 = init_bchunk(Source),
    ?line true = 
        dets:is_compatible_bchunk_format(TabRef, 
                                         dets:info(Source, bchunk_format)),
    ?line false = dets:is_compatible_bchunk_format(TabRef, <<"foobar">>),
    ?line ok = dets:init_table(TabRef, Fun2, {format, bchunk}),
    ?line ok = dets:close(Source),
    ?line file:delete(SourceFname),
    ?line All = sort(get_all_objects(TabRef)),
    ?line FAll = get_all_objects_fast(TabRef),
    ?line true = All =:= sort(FAll),
    ?line true = length(All) =:= 10000,
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    %% Initiate inserts fewer objects than the table contains.
    ?line {ok, _} = dets:open_file(Source, [{min_no_slots,1000} | SourceArgs]),
    ?line ok = ins(Source, 4000),
    
    ?line {ok, _} = dets:open_file(TabRef, [{min_no_slots,1000} | Args]),
    ?line ok = ins(TabRef, 6000),
    ?line FileSize1 = dets:info(TabRef, file_size),
    Fun4 = init_bchunk(Source),
    ?line ok = dets:init_table(TabRef, Fun4, {format, bchunk}),
    ?line ok = dets:close(Source),
    ?line file:delete(SourceFname),
    ?line FileSize2 = dets:info(TabRef, file_size),
    ?line All_2 = sort(get_all_objects(TabRef)),
    ?line FAll_2 = get_all_objects_fast(TabRef),
    ?line true = All_2 =:= sort(FAll_2),
    ?line true = length(All_2) =:= 4000,
    ?line ok = dets:close(TabRef),
    ?line true = FileSize1 > FileSize2,

    %% Bchunk and fixed table.
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line NoItems = dets:info(TabRef, no_objects),
    ?line AllObjects1 = sort(get_all_objects_fast(TabRef)),
    ?line dets:safe_fixtable(TabRef, true),
    ?line true = dets:info(TabRef, fixed),
    ?line Cont1 = init_bchunk(TabRef),
    ?line NoDel = 
	dets:select_delete(TabRef, [{{'_',{item,'_','_'}},[],[true]}]),
    ?line true = (NoDel > 0),
    ?line AllObjects2 = sort(get_all_objects_fast(TabRef)),
    ?line true = dets:info(TabRef, fixed),
    ?line Cont2 = init_bchunk(TabRef),
    ?line NoItems2 = dets:info(TabRef, no_objects),
    ?line true = (NoItems =:= NoItems2 + NoDel),
    ?line NoDel2 = dets:select_delete(TabRef, [{'_',[],[true]}]),
    ?line true = (NoDel2 > 0),
    ?line AllObjects3 = sort(get_all_objects_fast(TabRef)),
    ?line NoItems3 = dets:info(TabRef, no_objects),
    ?line true = (NoItems3 =:= 0),
    ?line true = dets:info(TabRef, fixed),
    ?line true = (NoItems2 =:= NoItems3 + NoDel2),
    ?line Cont3 = init_bchunk(TabRef),

    ?line BinColl1 = collect_bchunk(TabRef, Cont1),
    ?line BinColl2 = collect_bchunk(TabRef, Cont2),
    ?line BinColl3 = collect_bchunk(TabRef, Cont3),
    ?line dets:safe_fixtable(TabRef, false),
    ?line ok = dets:close(TabRef),    
    ?line file:delete(Fname),

    %% Now check that the above collected binaries are correct.
    ?line {ok, _} = dets:open_file(TabRef, Args),
    ?line ok = dets:init_table(TabRef, init([BinColl1]),{format,bchunk}),
    ?line true = (AllObjects1 =:= sort(get_all_objects_fast(TabRef))),
    ?line true = (length(AllObjects1) =:= dets:info(TabRef, no_objects)),
    ?line ok = dets:init_table(TabRef, init([BinColl2]),{format,bchunk}),
    ?line true = (AllObjects2 =:= sort(get_all_objects_fast(TabRef))),
    ?line true = (length(AllObjects2) =:= dets:info(TabRef, no_objects)),
    ?line ok = dets:init_table(TabRef, init([BinColl3]),{format,bchunk}),
    ?line true = (AllObjects3 =:= sort(get_all_objects_fast(TabRef))),
    ?line true = (length(AllObjects3) =:= dets:info(TabRef, no_objects)),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),
    ?line check_pps(P0),
    ok.

fast_bulk_init(L, Type, N, NoKeys, Config, V) ->
    fast_bulk_init(L, Type, N, NoKeys, 256, Config, V).

fast_bulk_init(L, Type, N, NoKeys, Est, Config, V) ->
    T = init_table_test,
    Fname = filename(T, Config),
    ?line file:delete(Fname),

    Args0 = [{ram_file,false}, {type,Type},{keypos,1},
	    {estimated_no_objects, Est},{version,V}],
    Args = [{file,Fname} | Args0],
    S = init_table_test_source,
    SFname = filename(S, Config),
    ?line file:delete(SFname),
    SArgs = [{file,SFname} | Args0],

    ?line {ok, S} = dets:open_file(S, SArgs),
    ?line ok = dets:insert(S, L),

    Input = init_bchunk(S),
    ?line {ok, T} = dets:open_file(T, Args),
    ?line ok = dets:init_table(T, Input, [{format,bchunk}]),
    ?line All = sort(get_all_objects(T)),
    ?line FAll = get_all_objects_fast(T),
    ?line true = All =:= sort(FAll),
    ?line true = length(All) =:= N,
    ?line true = dets:info(T, size) =:= N,
    ?line true = dets:info(T, no_keys) =:= NoKeys,
    ?line ok = dets:close(T),
    
    ?line {ok, T} = dets:open_file(T, Args),
    ?line All2 = sort(get_all_objects(T)),
    ?line FAll2 = get_all_objects_fast(T),
    ?line true = All =:= All2,
    ?line true = All =:= sort(FAll2),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    ?line ok = dets:close(S),
    ?line file:delete(SFname),
    ok.

init_bchunk(T) ->
    Start = dets:bchunk(T, start),
    init_bchunk(T, Start).

init_bchunk(Tab, State) ->
    fun(read) when State =:= '$end_of_table' ->
	    end_of_input;
       (read) when element(1, State) =:= error ->
	    State;
       (read) ->
	    {Cont, Objs} = State,
	    {Objs, init_bchunk(Tab, dets:bchunk(Tab, Cont))};
       (close) ->
	    ok
    end.

collect_bchunk(Tab, Fun) ->
    collect_bchunk(Tab, Fun, []).

collect_bchunk(Tab, Fun, L) ->
    case Fun(read) of
	end_of_input ->
	    lists:append(lists:reverse(L));
	{Objs, Fun2} when is_list(Objs) ->
	    collect_bchunk(Tab, Fun2, [Objs | L]);
	Error ->
	    Error
    end.

items(I, N, C, L) when I =:= N; C =:= 0 ->
    {I, L};
items(I, N, C, L) ->
    items(I+1, N, C-1, [{I, item(I)} | L]).

repair_v8(doc) ->
    ["open_file and repair."];
repair_v8(suite) -> 
    [];
repair_v8(Config) when is_list(Config) ->
    repair(Config, 8).

repair_v9(doc) ->
    ["open_file and repair."];
repair_v9(suite) -> 
    [];
repair_v9(Config) when is_list(Config) ->
    %% Convert from format 9 to format 8.
    T = convert_98,
    Fname = filename(T, Config),
    ?line file:delete(Fname),
    ?line {ok, _} = dets:open_file(T, [{file,Fname},{version,9},
				       {type,duplicate_bag}]),
    ?line 9 = dets:info(T, version),
    ?line true = is_binary(dets:info(T, bchunk_format)),
    ?line ok = dets:insert(T, [{1,a},{2,b},{1,c},{2,c},{1,c},{2,a},{1,b}]),
    ?line dets:close(T),
    ?line {error, {version_mismatch, _}} = 
	dets:open_file(T, [{file,Fname},{version,8},{type,duplicate_bag}]),
    ?line {ok, _} = dets:open_file(T, [{file,Fname},{version,8},
				       {type,duplicate_bag},{repair,force}]),
    ?line 8 = dets:info(T, version),
    ?line true = undefined =:= dets:info(T, bchunk_format),
    ?line [{1,a},{1,b},{1,c},{1,c}] = sort(dets:lookup(T, 1)),
    ?line [{2,a},{2,b},{2,c}] = sort(dets:lookup(T, 2)),
    ?line 7 = dets:info(T, no_objects),
    ?line no_keys_test(T),
    ?line _ = histogram(T, silent),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    %% The short lived format 9(a).
    %% Not very throughly tested here.
    A9 = a9,
    ?line Version9aS = filename:join(?datadir(Config), "version_9a.dets"),
    ?line Version9aT = filename('v9a.dets', Config),
    ?line {ok, _} = file:copy(Version9aS, Version9aT),
    ?line {ok, A9} = dets:open_file(A9, [{file,Version9aT}]),
    ?line undefined = dets:info(A9, bchunk_format),
    ?line [{1,a},{2,b},{3,c}] = sort(dets:match_object(A9, '_')),
    ?line ok = dets:insert(A9, {4,d}),
    ?line ok = dets:close(A9),
    ?line {ok, A9} = dets:open_file(A9, [{file,Version9aT}]),
    ?line {error, old_version} = dets:bchunk(A9, start),
    ?line ok = dets:close(A9),
    ?line io:format("Expect forced repair:~n"),
    ?line {ok, A9} = dets:open_file(A9, [{file,Version9aT},{repair,force}]),
    ?line {_, _} = dets:bchunk(A9, start),
    ?line ok = dets:close(A9),
    ?line file:delete(Version9aT),

    repair(Config, 9).

repair(Config, V) ->
    TabRef = repair_test,
    Fname = filename(TabRef, Config),
    ?line file:delete(Fname),
    HeadSize = headsz(V),

    P0 = pps(),
    ?line {'EXIT', {badarg, _}} = 
	(catch dets:open_file(TabRef, [{min_no_slots,1000},
				       {max_no_slots,500}])),
    ?line {error,{file_error,hoppla,enoent}} = dets:file_info(hoppla),
    ?line {error,{file_error,Fname,enoent}} = 
	dets:open_file(TabRef, [{file, Fname}, {access, read}]),

    %% compacting, and some kind of test that free lists are saved OK on file
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line 0 = dets:info(TabRef, size),
    ?line ok = ins(TabRef, 30000),
    ?line ok = del(TabRef, 30000, 3),
    ?line ok = dets:close(TabRef),
    ?line {error, {access_mode,Fname}} =
        dets:open_file(foo, [{file,Fname},{repair,force},{access,read}]),
    ?line {ok, Ref3} = dets:open_file(Fname), % no repair!
    ?line 20000 = dets:info(Ref3, size),
    ?line 20000 = dets:foldl(fun(_, N) -> N+1 end, 0, Ref3),
    ?line 20000 = count_objects_quite_fast(Ref3), % actually a test of match
    ?line no_keys_test(Ref3),
    ?line ok = dets:close(Ref3),
    if
        V =:= 8 ->
            ?line {ok, TabRef} = dets:open_file(TabRef, 
                                   [{file, Fname},{version,V},{access,read}]),
            ?line ok = dets:close(TabRef),
            ?line io:format("Expect compacting repair:~n"),
            ?line {ok, TabRef} = dets:open_file(TabRef, 
                                                [{file, Fname},{version,V}]),
            ?line 20000 = dets:info(TabRef, size),
	    ?line _ = histogram(TabRef, silent),
            ?line ok = dets:close(TabRef);
        true ->
            ok
    end,
    ?line {error,{keypos_mismatch,Fname}} = 
	dets:open_file(TabRef, [{file, Fname},{keypos,17}]),
    ?line {error,{type_mismatch,Fname}} = 
	dets:open_file(TabRef, [{file, Fname},{type,duplicate_bag}]),

    %% make one of the temporary files unwritable
    TmpFile = if 
		  V =:= 8 -> 
		      Fname ++ ".TMP.10000"; 
		  true -> Fname ++ ".TMP.1" 
	      end,
    ?line file:delete(TmpFile),
    ?line {ok, TmpFd} = file:open(TmpFile, [read,write]),
    ?line ok = file:close(TmpFd),
    ?line unwritable(TmpFile),
    ?line {error,{file_error,TmpFile,eacces}} = dets:fsck(Fname, V),
    ?line {ok, _} = dets:open_file(TabRef, 
                        [{repair,false},{file, Fname},{version,V}]),
    ?line 20000 = length(get_all_objects(TabRef)),
    ?line _ = histogram(TabRef, silent),
    ?line 20000 = length(get_all_objects_fast(TabRef)),
    ?line ok = dets:close(TabRef),
    ?line writable(TmpFile),
    ?line file:delete(TmpFile),

    ?line truncate(Fname, HeadSize + 10),
    ?line {error,{not_closed, Fname}} = 
	dets:open_file(TabRef, [{file, Fname}, {access, read}]),
    ?line {error,{not_closed, Fname}} = 
	dets:open_file(TabRef, [{file, Fname}, {access, read}, 
                                {repair,force}]),
    ?line {error,{needs_repair, Fname}} = 
	dets:open_file(TabRef, [{file, Fname}, {repair, false}]),
    ?line file:delete(Fname),

    %% truncated file header
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = ins(TabRef, 100),
    ?line ok = dets:close(TabRef),
    ?line truncate(Fname, HeadSize - 10),    
    %% a new file is created ('tooshort')
    ?line {ok, TabRef} = dets:open_file(TabRef, 
					[{file,Fname},{version,V},
					 {min_no_slots,1000},
					 {max_no_slots,1000000}]),
    case dets:info(TabRef, no_slots) of
	undefined -> ok;
	{Min1,Slot1,Max1} ->
	    ?line true = Min1 =< Slot1, true = Slot1 =< Max1,
	    ?line true = 1000 < Min1, true = 1000+256 > Min1,
	    ?line true = 1000000 < Max1, true = (1 bsl 20)+256 > Max1
    end,
    ?line 0 = dets:info(TabRef, size),
    ?line no_keys_test(TabRef),
    ?line _ = histogram(TabRef, silent),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    %% version bump (v8)
    ?line Version7S = filename:join(?datadir(Config), "version_r2d.dets"),
    ?line Version7T = filename('v2.dets', Config),
    ?line {ok, _} = file:copy(Version7S, Version7T),
    ?line {error,{version_bump, Version7T}} = dets:open_file(Version7T),
    ?line {error,{version_bump, Version7T}} = 
	dets:open_file(Version7T, [{file,Version7T},{repair,false}]),
    ?line {error,{version_bump, Version7T}} = 
	dets:open_file(Version7T, [{file, Version7T}, {access, read}]),
    ?line io:format("Expect upgrade:~n"),
    ?line {ok, _} = dets:open_file(Version7T, 
                                   [{file, Version7T},{version, V}]),
    ?line [{1,a},{2,b}] = sort(get_all_objects(Version7T)),
    ?line [{1,a},{2,b}] = sort(get_all_objects_fast(Version7T)),
    Phash = if 
		V =:= 8 -> phash;
		true -> phash2
	    end,
    ?line Phash = dets:info(Version7T, hash),
    ?line _ = histogram(Version7T, silent),
    ?line ok = dets:close(Version7T),
    ?line {ok, _} = dets:open_file(Version7T, [{file, Version7T}]),
    ?line Phash = dets:info(Version7T, hash),
    ?line ok = dets:close(Version7T),
    ?line file:delete(Version7T),

    %% converting free lists
    ?line Version8aS = filename:join(?datadir(Config), "version_r3b02.dets"),
    ?line Version8aT = filename('v3.dets', Config),
    ?line {ok, _} = file:copy(Version8aS, Version8aT),
    %% min_no_slots and max_no_slots are ignored - no repair is taking place
    ?line {ok, _} = dets:open_file(version_8a, 
				   [{file, Version8aT},{min_no_slots,1000},
				    {max_no_slots,100000}]),
    ?line [{1,b},{2,a},{a,1},{b,2}] = sort(get_all_objects(version_8a)),
    ?line [{1,b},{2,a},{a,1},{b,2}] = sort(get_all_objects_fast(version_8a)),
    ?line ok = ins(version_8a, 1000),
    ?line 1002 = dets:info(version_8a, size),
    ?line no_keys_test(version_8a),
    ?line All8a = sort(get_all_objects(version_8a)),
    ?line 1002 = length(All8a),
    ?line FAll8a = sort(get_all_objects_fast(version_8a)),
    ?line true = sort(All8a) =:= sort(FAll8a),
    ?line ok = del(version_8a, 300, 3),
    ?line 902 = dets:info(version_8a, size),
    ?line no_keys_test(version_8a),
    ?line All8a2 = sort(get_all_objects(version_8a)),
    ?line 902 = length(All8a2),
    ?line FAll8a2 = sort(get_all_objects_fast(version_8a)),
    ?line true = sort(All8a2) =:= sort(FAll8a2),
    ?line _ = histogram(version_8a, silent),
    ?line ok = dets:close(version_8a),
    ?line file:delete(Version8aT),

    %% will fail unless the slots are properly sorted when repairing (v8)
    BArgs = [{file, Fname},{type,duplicate_bag},
	     {delayed_write,{3000,10000}},{version,V}],
    ?line {ok, TabRef} = dets:open_file(TabRef, BArgs),
    Seq = seq(1, 500),
    Small = map(fun(X) -> {X,X} end, Seq),
    Big = map(fun(X) -> erlang:make_tuple(20, X) end, Seq),
    ?line ok = dets:insert(TabRef, Small),
    ?line ok = dets:insert(TabRef, Big),
    ?line ok = dets:insert(TabRef, Small),
    ?line ok = dets:insert(TabRef, Big),
    ?line All = sort(safe_get_all_objects(TabRef)),
    ?line ok = dets:close(TabRef),
    ?line io:format("Expect forced repair:~n"),
    ?line {ok, _} = 
         dets:open_file(TabRef, [{repair,force},{min_no_slots,2000} | BArgs]),
    if 
	V =:= 9 ->
	    ?line {MinNoSlots,_,MaxNoSlots} = dets:info(TabRef, no_slots),
	    ?line ok = dets:close(TabRef),
	    ?line io:format("Expect compaction:~n"),
	    ?line {ok, _} = 
		dets:open_file(TabRef, [{repair,force},
					{min_no_slots,MinNoSlots},
					{max_no_slots,MaxNoSlots} | BArgs]);
	true ->
	    ok
    end,
    ?line All2 = get_all_objects(TabRef),
    ?line true = All =:= sort(All2),
    ?line FAll2 = get_all_objects_fast(TabRef),
    ?line true = All =:= sort(FAll2),
    ?line true = length(All) =:= dets:info(TabRef, size),
    ?line no_keys_test(TabRef),
    Fun = fun(X) -> 4 = length(dets:lookup(TabRef, X)) end,
    ?line foreach(Fun, Seq),
    ?line _ = histogram(TabRef, silent),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    %% object bigger than segments, the "hole" is taken care of
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file, Fname},{version,V}]),
    Tuple = erlang:make_tuple(1000, foobar), % > 2 kB
    ?line ok = dets:insert(TabRef, Tuple),
    %% at least one full segment (objects smaller than 2 kB):
    ?line ins(TabRef, 2000), 
    ?line ok = dets:close(TabRef),

    if 
        V =:= 8 ->
            %% first estimated number of objects is wrong, repair once more
            ?line {ok, Fd} = file:open(Fname, [read,write]),
            NoPos = HeadSize - 8,  % no_objects
            ?line file:pwrite(Fd, NoPos, <<0:32>>), % NoItems
            ok = file:close(Fd),
            ?line dets:fsck(Fname, V),
            ?line {ok, _} = 
                dets:open_file(TabRef, 
                               [{repair,false},{file, Fname},{version,V}]),
            ?line 2001 = length(get_all_objects(TabRef)),
            ?line _ = histogram(TabRef, silent),
            ?line 2001 = length(get_all_objects_fast(TabRef)),
            ?line ok = dets:close(TabRef);
        true ->
            ok
    end,

    ?line {ok, _} = 
        dets:open_file(TabRef, 
                       [{repair,false},{file, Fname},{version,V}]),
    ?line {ok, ObjPos} = dets:where(TabRef, {66,{item,number,66}}),
    ?line ok = dets:close(TabRef),
    %% Damaged object.
    Pos = 12, % v9: compaction fails, proper repair follows
    crash(Fname, ObjPos+Pos),
    ?line io:format(
	    "Expect forced repair (possibly after attempted compaction):~n"),
    ?line {ok, _} = 
	dets:open_file(TabRef, [{repair,force},{file, Fname},{version,V}]),
    ?line true = dets:info(TabRef, size) < 2001,
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    %% The file is smaller than the padded object.
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = dets:insert(TabRef, Tuple),
    ?line ok = dets:close(TabRef),
    ?line io:format("Expect forced repair or compaction:~n"),
    ?line {ok, _} = 
	dets:open_file(TabRef, [{repair,force},{file, Fname},{version,V}]),
    ?line true = 1 =:= dets:info(TabRef, size),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    %% Damaged free lists.
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = ins(TabRef, 300),
    ?line ok = dets:sync(TabRef),
    ?line ok = del(TabRef, 300, 3),
    %% FileSize is approximately where the free lists will be written.
    ?line FileSize = dets:info(TabRef, memory),
    ?line ok = dets:close(TabRef),
    crash(Fname, FileSize+20),
    %% Used to return bad_freelists, but that changed in OTP-9622
    ?line {ok, TabRef} =
	dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),

    %% File not closed, opening with read and read_write access tried.
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = ins(TabRef, 300),
    ?line ok = dets:close(TabRef),
    ?line crash(Fname, ?CLOSED_PROPERLY_POS+3, ?NOT_PROPERLY_CLOSED),
    ?line {error, {not_closed, Fname}} =
       dets:open_file(foo, [{file,Fname},{version,V},{repair,force},
                            {access,read}]),
    ?line {error, {not_closed, Fname}} =
       dets:open_file(foo, [{file,Fname},{version,V},{repair,true},
                            {access,read}]),
    ?line io:format("Expect repair:~n"),
    ?line {ok, TabRef} =
       dets:open_file(TabRef, [{file,Fname},{version,V},{repair,true},
                               {access,read_write}]),
    ?line ok = dets:close(TabRef),
    ?line crash(Fname, ?CLOSED_PROPERLY_POS+3, ?NOT_PROPERLY_CLOSED),
    ?line io:format("Expect forced repair:~n"),
    ?line {ok, TabRef} =
       dets:open_file(TabRef, [{file,Fname},{version,V},{repair,force},
                               {access,read_write}]),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),    

    %% The size of an object is huge.
    ?line {ok, TabRef} = dets:open_file(TabRef, [{file,Fname},{version,V}]),
    ?line ok = dets:insert(TabRef, [{1,2,3},{2,3,4}]),
    ?line {ok, ObjPos2} = dets:where(TabRef, {1,2,3}),
    ?line ok = dets:close(TabRef),
    ObjPos3 = if
                  V =:= 8 -> ObjPos2 + 4;
                  V =:= 9 -> ObjPos2
              end,
    crash(Fname, ObjPos3, 255),
    ?line io:format("Expect forced repair:~n"),
    ?line {ok, TabRef} = 
         dets:open_file(TabRef, [{file,Fname},{version,V},{repair,force}]),
    ?line ok = dets:close(TabRef),
    ?line file:delete(Fname),    

    ?line check_pps(P0),
    ok.

hash_v8b_v8c(doc) ->
    ["Test the use of different hashing algorithms in v8b and v8c of the "
     "Dets file format."];
hash_v8b_v8c(suite) ->
    [];
hash_v8b_v8c(Config) when is_list(Config) ->
    ?line Source = 
	filename:join(?datadir(Config), "dets_test_v8b.dets"),
    %% Little endian version of old file (there is an endianess bug in 
    %% the old hash). This is all about version 8 of the dets file format.

    P0 = pps(),
    ?line SourceLE = 
	filename:join(?datadir(Config), 
		      "dets_test_v8b_little_endian.dets"),
    ?line Target1 = filename('oldhash1.dets', Config),
    ?line Target1LE = filename('oldhash1le.dets', Config),
    ?line Target2 = filename('oldhash2.dets', Config),
    ?line {ok, Bin} = file:read_file(Source),
    ?line {ok, BinLE} = file:read_file(SourceLE),
    ?line ok = file:write_file(Target1,Bin),
    ?line ok = file:write_file(Target1LE,BinLE),
    ?line ok = file:write_file(Target2,Bin),
    ?line {ok, d1} = dets:open_file(d1,[{file,Target1}]),
    ?line {ok, d1le} = dets:open_file(d1le,[{file,Target1LE}]),
    ?line {ok, d2} = dets:open_file(d2,[{file,Target2},{repair,force},
                                        {version,8}]),
    ?line FF = fun(N,_F,_T) when N > 16#FFFFFFFFFFFFFFFF -> 
		       ok;
		  (N,F,T) -> 
		       V = integer_to_list(N),
		       case dets:lookup(T,N) of
				 [{N,V}] ->
				     F(N*2,F,T);
				 _Error ->
				     exit({failed,{lookup,T,N}})
			     end
	       end,
    ?line Mess = case (catch FF(1,FF,d1)) of
		     {'EXIT', {failed, {lookup,_,_}}} ->
			 ?line ok = dets:close(d1),
			 ?line FF(1,FF,d1le),
			 ?line hash = dets:info(d1le,hash),
			 ?line dets:insert(d1le,{33333333333,hejsan}),
			 ?line [{33333333333,hejsan}] = 
			     dets:lookup(d1le,33333333333),
			 ?line ok = dets:close(d1le),
			 ?line {ok, d1le} = dets:open_file(d1le,
							   [{file,Target1LE}]),
			 ?line [{33333333333,hejsan}] = 
			     dets:lookup(d1le,33333333333),
			 ?line FF(1,FF,d1le),
			 ?line ok = dets:close(d1le),
			 "Seems to be a little endian machine";
		     {'EXIT', Fault} ->
			 exit(Fault);
		     _ ->
			 ?line ok = dets:close(d1le),
			 ?line hash = dets:info(d1,hash),
			 ?line dets:insert(d1,{33333333333,hejsan}),
			 ?line [{33333333333,hejsan}] = 
			     dets:lookup(d1,33333333333),
			 ?line ok = dets:close(d1),
			 ?line {ok, d1} = dets:open_file(d1,[{file,Target1}]),
			 ?line [{33333333333,hejsan}] = 
			     dets:lookup(d1,33333333333),
			 ?line FF(1,FF,d1),
			 ?line ok = dets:close(d1),
			 "Seems to be a big endian machine"
		 end,
    ?line FF(1,FF,d2),
    ?line phash = dets:info(d2,hash),
    ?line ok = dets:close(d2),
    ?line file:delete(Target1),
    ?line file:delete(Target1LE),
    ?line file:delete(Target2),
    ?line check_pps(P0),
    {comment, Mess}.

phash(doc) ->
    ["Test version 9(b) with erlang:phash/2 as hash function."];
phash(suite) ->
    [];
phash(Config) when is_list(Config) ->
    T = phash,
    Phash_v9bS = filename:join(?datadir(Config), "version_9b_phash.dat"),
    Fname = filename('v9b.dets', Config),
    ?line {ok, _} = file:copy(Phash_v9bS, Fname),
    
    %% Deleting all objects changes the hash function. 
    %% A feature... (it's for free)
    ?line {ok, T} = dets:open_file(T, [{file, Fname}]),
    ?line phash = dets:info(T, hash),
    ?line dets:delete_all_objects(T),
    ?line phash2 = dets:info(T, hash),
    ?line [] = get_all_objects(T),
    ?line [] = get_all_objects_fast(T),
    ?line ok = dets:close(T),

    %% The hash function is kept when compacting a table.
    ?line {ok, _} = file:copy(Phash_v9bS, Fname),
    ?line io:format("Expect compaction:~n"),
    ?line {ok, T} = dets:open_file(T, [{file, Fname},{repair,force}]),
    ?line phash = dets:info(T, hash),
    ?line [{1,a},{2,b},{3,c},{4,d},{5,e}] =
	lists:sort(dets:lookup_keys(T, [1,2,3,4,5])),
    ?line ok = dets:close(T),

    %% The hash function is updated when repairing a table (no cost).
    ?line {ok, _} = file:copy(Phash_v9bS, Fname),
    crash(Fname, ?CLOSED_PROPERLY_POS+3, 0),
    ?line io:format("Expect repair:~n"),
    ?line {ok, T} = dets:open_file(T, [{file, Fname}]),
    ?line phash2 = dets:info(T, hash),
    ?line [{1,a},{2,b},{3,c},{4,d},{5,e}] =
	lists:sort(dets:lookup_keys(T, [1,2,3,4,5])),
    ?line ok = dets:close(T),
    
    %% One cannot use the bchunk format when copying between a phash
    %% table and a phash2 table. (There is no test for the case an R9
    %% (or later) node (using phash2) copies a table to an R8 node
    %% (using phash).) See also the comment on HASH_PARMS in dets_v9.erl.
    ?line {ok, _} = file:copy(Phash_v9bS, Fname),
    ?line {ok, T} = dets:open_file(T, [{file, Fname}]),
    ?line Type = dets:info(T, type),
    ?line KeyPos = dets:info(T, keypos),
    Input = init_bchunk(T),    
    T2 = phash_table,
    Fname2 = filename(T2, Config),
    Args = [{type,Type},{keypos,KeyPos},{version,9},{file,Fname2}],
    ?line {ok, T2} = dets:open_file(T2, Args),
    ?line {error, {init_fun, _}} = 
	dets:init_table(T2, Input, {format,bchunk}),
    ?line _ = dets:close(T2),
    ?line ok = dets:close(T),
    ?line file:delete(Fname2),

    ?line file:delete(Fname),
    ok.

fold_v8(doc) ->
    ["foldl, foldr, to_ets"];
fold_v8(suite) ->
    [];
fold_v8(Config) when is_list(Config) ->
    fold(Config, 8).

fold_v9(doc) ->
    ["foldl, foldr, to_ets"];
fold_v9(suite) ->
    [];
fold_v9(Config) when is_list(Config) ->
    fold(Config, 9).

fold(Config, Version) ->
    T = test_table,
    N = 100,
    ?line Fname = filename(T, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    Args = [{version, Version}, {file,Fname}, {estimated_no_objects, N}],
    ?line {ok, _} = dets:open_file(T, Args),

    ?line ok = ins(T, N),

    ?line Ets = ets:new(to_ets, [public]),
    ?line dets:to_ets(T, Ets),
    ?line true = N =:= ets:info(Ets, size),
    ?line ets:delete(Ets),

    ?line Ets2 = ets:new(to_ets, [private]),
    ?line dets:to_ets(T, Ets2),
    ?line true = N =:= ets:info(Ets2, size),
    ?line ets:delete(Ets2),

    ?line {'EXIT', {badarg, _}} = (catch dets:to_ets(T, not_an_ets_table)),

    F0 = fun(X, A) -> [X | A] end,
    ?line true = N =:= length(dets:foldl(F0, [], T)),
    ?line true = N =:= length(dets:foldr(F0, [], T)),

    F1 = fun(_X, _A) -> throw(away) end, 
    ?line away = (catch dets:foldl(F1, [], T)),
    ?line away = (catch dets:foldr(F1, [], T)),

    F2 = fun(X, A) -> X + A end, 
    ?line {'EXIT', _} = (catch dets:foldl(F2, [], T)),
    ?line {'EXIT', _} = (catch dets:foldr(F2, [], T)),

    F3 = fun(_X) -> throw(away) end,
    ?line away = (catch dets:traverse(T, F3)),

    F4 = fun(X) -> X + 17 end,
    ?line {'EXIT', _} = (catch dets:traverse(T, F4)),

    ?line F5 = fun(_X) -> done end,
    ?line done = dets:traverse(T, F5),

    ?line {ok, ObjPos} = dets:where(T, {66,{item,number,66}}),
    ?line ok = dets:close(T),

    %% Damaged object.
    Pos = if 
	      Version =:= 8 -> 12;
	      Version =:= 9 -> 8
	  end,
    crash(Fname, ObjPos+Pos),
    ?line {ok, _} = dets:open_file(T, Args),
    ?line io:format("Expect corrupt table:~n"),
    ?line BadObject1 = dets:foldl(F0, [], T),
    ?line bad_object(BadObject1, Fname),
    ?line BadObject2 = dets:close(T), 
    ?line bad_object(BadObject2, Fname),

    ?line file:delete(Fname),
    ?line check_pps(P0),
    ok.

fixtable_v8(doc) ->
    ["Add objects to a fixed table."];
fixtable_v8(suite) ->
    [];
fixtable_v8(Config) when is_list(Config) ->
    fixtable(Config, 8).

fixtable_v9(doc) ->
    ["Add objects to a fixed table."];
fixtable_v9(suite) ->
    [];
fixtable_v9(Config) when is_list(Config) ->
    fixtable(Config, 9).

fixtable(Config, Version) when is_list(Config) ->
    T = fixtable,
    ?line Fname = filename(fixtable, Config),
    ?line file:delete(Fname),
    Args = [{version,Version},{file,Fname}],
    P0 = pps(),
    ?line {ok, _} = dets:open_file(T, Args),

    %% badarg
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:safe_fixtable(no_table,true)),
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[T,undefined],_}|_]}} =
	(catch dets:safe_fixtable(T,undefined)),

    %% The table is not allowed to grow while the elements are inserted:

    ?line ok = ins(T, 500),
    ?line dets:safe_fixtable(T, false),    
    %% Now the table can grow. At the same time as elements are inserted,
    %% the table tries to catch up with the previously inserted elements.
    ?line ok = ins(T, 1000),
    ?line 1000 = dets:info(T, size),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(T, [{type, duplicate_bag} | Args]),
    %% In a fixed table, delete and re-insert an object.
    ?line ok = dets:insert(T, {1, a, b}),
    ?line dets:safe_fixtable(T, true),
    ?line ok = dets:match_delete(T, {1, a, b}),
    ?line ok = dets:insert(T, {1, a, b}),
    ?line dets:safe_fixtable(T, false),
    ?line 1 = length(dets:match_object(T, '_')),

    ?line ok = dets:match_delete(T, '_'),
    %% In a fixed table, delete and insert a smaller object.
    ?line ok = dets:insert(T, {1, duplicate(100, e)}),
    ?line dets:safe_fixtable(T, true),
    ?line ok = dets:match_delete(T, {1, '_'}),
    ?line ok = dets:insert(T, {1, a, b}),
    ?line dets:safe_fixtable(T, false),
    ?line 1 = length(dets:match_object(T, '_')),

    ?line ok = dets:delete_all_objects(T),
    %% Like the last one, but one extra object.
    ?line ok = dets:insert(T, {1, duplicate(100, e)}),
    ?line ok = dets:insert(T, {2, duplicate(100, e)}),
    ?line dets:safe_fixtable(T, true),
    ?line ok = dets:match_delete(T, {1, '_'}),
    ?line ok = dets:insert(T, {1, a, b}),
    ?line dets:safe_fixtable(T, false),
    ?line 2 = length(dets:match_object(T, '_')),
    ?line dets:safe_fixtable(T, true),
    ?line ok = dets:delete_all_objects(T),
    ?line true = dets:info(T, fixed),
    ?line 0 = length(dets:match_object(T, '_')),

    ?line ok = dets:close(T),
    ?line file:delete(Fname),    
    ?line check_pps(P0),
    ok.

match_v8(doc) ->
    ["Matching objects of a fixed table."];
match_v8(suite) ->
    [];
match_v8(Config) when is_list(Config) ->
    match(Config, 8).

match_v9(doc) ->
    ["Matching objects of a fixed table."];
match_v9(suite) ->
    [];
match_v9(Config) when is_list(Config) ->
    match(Config, 9).

match(Config, Version) ->
    T = match,
    ?line Fname = filename(match, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    Args = [{version, Version}, {file,Fname}, {type, duplicate_bag},
	    {estimated_no_objects,550}],
    ?line {ok, _} = dets:open_file(T, Args),
    ?line ok = dets:insert(T, {1, a, b}),
    ?line ok = dets:insert(T, {1, b, a}),
    ?line ok = dets:insert(T, {2, a, b}),
    ?line ok = dets:insert(T, {2, b, a}),

    %% match, badarg
    MSpec = [{'_',[],['$_']}],
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:match(no_table, '_')),
    ?line {'EXIT', {badarg, [{dets,match,[T,'_',not_a_number],_}|_]}} =
	(catch dets:match(T, '_', not_a_number)),
    ?line {EC1, _} = dets:select(T, MSpec, 1),
    ?line {'EXIT', {badarg, [{dets,match,[EC1],_}|_]}} =
	(catch dets:match(EC1)),

    %% match_object, badarg
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:match_object(no_table, '_')),
    ?line {'EXIT', {badarg, [{dets,match_object,[T,'_',not_a_number],_}|_]}} =
	(catch dets:match_object(T, '_', not_a_number)),
    ?line {EC2, _} = dets:select(T, MSpec, 1),
    ?line {'EXIT', {badarg, [{dets,match_object,[EC2],_}|_]}} =
	(catch dets:match_object(EC2)),

    dets:safe_fixtable(T, true),
    ?line {[_, _], C1} = dets:match_object(T, '_', 2),
    ?line {[_, _], C2} = dets:match_object(C1),
    ?line '$end_of_table' = dets:match_object(C2),
    ?line {[_, _], C3} = dets:match_object(T, {1, '_', '_'}, 100),
    ?line '$end_of_table' = dets:match_object(C3),
    ?line '$end_of_table' = dets:match_object(T, {'_'}, default),
    ?line dets:safe_fixtable(T, false),

    ?line dets:safe_fixtable(T, true),
    ?line {[_, _], C30} = dets:match(T, '$1', 2),
    ?line {[_, _], C31} = dets:match(C30),
    ?line '$end_of_table' = dets:match(C31),
    ?line {[_, _], C32} = dets:match(T, {1, '$1', '_'}, 100),
    ?line '$end_of_table' = dets:match(C32),
    ?line '$end_of_table' = dets:match(T, {'_'}, default),
    ?line dets:safe_fixtable(T, false),
    ?line [[1],[1],[2],[2]] = sort(dets:match(T, {'$1','_','_'})),

    %% delete and insert while chunking
    %% (this case almost worthless after changes in OTP-5232)
    ?line ok = dets:match_delete(T, '_'),
    L500 = seq(1, 500),
    Fun = fun(X) -> ok = dets:insert(T, {X, a, b, c, d}) end,
    ?line foreach(Fun, L500),
    %% Select one object DI in L3 below to be deleted.
    ?line {_, TmpCont} = dets:match_object(T, '_', 200),    
    ?line {_, TmpCont1} = dets:match_object(TmpCont),
    ?line {TTL, _} = dets:match_object(TmpCont1),
    ?line DI = if Version =:= 8 -> last(TTL); Version =:= 9 -> hd(TTL) end,
    ?line dets:safe_fixtable(T, true),
    ?line {L1, C20} = dets:match_object(T, '_', 200),    
    ?line true = 200 =< length(L1),
    ?line ok = dets:match_delete(T, {'2','_','_'}), % no match
    ?line ok = dets:match_delete(T, DI), % last object
    Tiny = {1050},
    ?line ok = dets:insert(T, Tiny),
    ?line true = member(Tiny, dets:match_object(T, '_')),
    ?line {_L2, C21} = dets:match_object(C20),
    ?line {_L3, _C22} = dets:match_object(C21),
    %% It used to be that Tiny was not visible here, but since the 
    %% scanning of files was changed to inspect the free lists every
    %% now and then it may very well be visible here.
    %% ?line false = member(Tiny, _L3),
    %% DI used to visible here, but the above mentioned modification
    %% has changed that; it may or may not be visible.
    %% ?line true = member(DI, _L3),
    ?line dets:safe_fixtable(T, false),
    ?line true = dets:member(T, 1050),
    ?line true = member(Tiny, dets:match_object(T, '_')),
    ?line false = member(DI, dets:match_object(T, '_')),

    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    N = 100,
    ?line {ok, _} = dets:open_file(T, [{estimated_no_objects,N} | Args]),
    ?line ok = ins(T, N),
    Obj = {66,{item,number,66}},
    Spec = {'_','_'},
    ?line {ok, ObjPos} = dets:where(T, Obj),
    ?line ok = dets:close(T),
    %% Damaged object.
    crash(Fname, ObjPos+12),
    ?line {ok, _} = dets:open_file(T, Args),
    ?line io:format("Expect corrupt table:~n"),
    ?line case ins(T, N) of
	      ok ->
                  ?line bad_object(dets:sync(T), Fname);
	      Else ->
		  ?line bad_object(Else, Fname)
	  end,
    ?line io:format("Expect corrupt table:~n"),
    ?line bad_object(dets:match(T, Spec), Fname),
    ?line io:format("Expect corrupt table:~n"),
    ?line bad_object(dets:match_delete(T, Spec), Fname),
    ?line bad_object(dets:close(T), Fname),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(T, [{estimated_no_objects,N} | Args]),
    ?line ok = ins(T, N),
    ?line {ok, ObjPos2} = dets:where(T, Obj),
    ?line ok = dets:close(T),

    %% Damaged size of object.
    %% In v8, there is a next pointer before the size.
    CrashPos = if Version =:= 8 -> 5; Version =:= 9 -> 1 end,
    crash(Fname, ObjPos2+CrashPos),
    ?line {ok, _} = dets:open_file(T, Args),
    ?line io:format("Expect corrupt table:~n"),
    ?line case ins(T, N) of
	      ok ->
		  ?line bad_object(dets:sync(T), Fname);
	      Else2 ->
		  ?line bad_object(Else2, Fname)
	  end,
    %% Just echoes...
    ?line bad_object(dets:match(T, Spec), Fname),
    ?line bad_object(dets:match_delete(T, Spec), Fname),
    ?line bad_object(dets:close(T), Fname),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(T, [{estimated_no_objects,N} | Args]),
    ?line ok = ins(T, N),
    ?line {ok, ObjPos3} = dets:where(T, Obj),
    ?line ok = dets:close(T),

    %% match_delete finds an error
    CrashPos3 = if Version =:= 8 -> 12; Version =:= 9 -> 16 end,
    crash(Fname, ObjPos3+CrashPos3),
    ?line {ok, _} = dets:open_file(T, Args),
    ?line bad_object(dets:match_delete(T, Spec), Fname),
    ?line bad_object(dets:close(T), Fname),
    ?line file:delete(Fname),

    %% The key is not fixed, but not all objects with the key are removed.
    ?line {ok, _} = dets:open_file(T, Args),
    ?line ok = dets:insert(T, [{1,a},{1,b},{1,c},{1,a},{1,b},{1,c}]),
    ?line 6 = dets:info(T, size),
    ?line ok = dets:match_delete(T, {'_',a}),
    ?line 4 = dets:info(T, size),
    ?line [{1,b},{1,b},{1,c},{1,c}] = 
	sort(dets:match_object(T,{'_','_'})),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    ?line check_pps(P0),
    ok.

select_v8(doc) ->
    ["Selecting objects of a fixed table."];
select_v8(suite) ->
    [];
select_v8(Config) when is_list(Config) ->
    select(Config, 8).

select_v9(doc) ->
    ["Selecting objects of a fixed table."];
select_v9(suite) ->
    [];
select_v9(Config) when is_list(Config) ->
    select(Config, 9).

select(Config, Version) ->
    T = select,
    ?line Fname = filename(select, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    ?line Args = [{version,Version}, {file,Fname}, {type, duplicate_bag},
		  {estimated_no_objects,550}],
    ?line {ok, _} = dets:open_file(T, Args),
    ?line ok = dets:insert(T, {1, a, b}),
    ?line ok = dets:insert(T, {1, b, a}),
    ?line ok = dets:insert(T, {2, a, b}),
    ?line ok = dets:insert(T, {2, b, a}),
    ?line ok = dets:insert(T, {3, a, b}),
    ?line ok = dets:insert(T, {3, b, a}),

    %% badarg
    MSpec = [{'_',[],['$_']}],
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:select(no_table, MSpec)),
    ?line {'EXIT', {badarg, [{dets,select,[T,<<17>>],_}|_]}} =
	(catch dets:select(T, <<17>>)),
    ?line {'EXIT', {badarg, [{dets,select,[T,[]],_}|_]}} =
	(catch dets:select(T, [])),
    ?line {'EXIT', {badarg, [{dets,select,[T,MSpec,not_a_number],_}|_]}} =
	(catch dets:select(T, MSpec, not_a_number)),
    ?line {EC, _} = dets:match(T, '_', 1),
    ?line {'EXIT', {badarg, [{dets,select,[EC],_}|_]}} =
	(catch dets:select(EC)),

    AllSpec = [{'_',[],['$_']}],

    ?line dets:safe_fixtable(T, true),
    ?line {[_, _], C1} = dets:select(T, AllSpec, 2),
    ?line {[_, _], C2} = dets:select(C1),
    ?line {[_, _], C2a} = dets:select(C2),
    ?line '$end_of_table' = dets:select(C2a),
    ?line {[_, _], C3} = dets:select(T, [{{1,'_','_'},[],['$_']}], 100),
    ?line '$end_of_table' = dets:select(C3),
    ?line '$end_of_table' = dets:select(T, [{{'_'},[],['$_']}], default),
    ?line dets:safe_fixtable(T, false),
    Sp1 = [{{1,'_','_'},[],['$_']},{{1,'_','_'},[],['$_']},
	   {{2,'_','_'},[],['$_']}],
    ?line [_,_,_,_] = dets:select(T, Sp1),
    Sp2 = [{{1,'_','_'},[],['$_']},{{1,'_','_'},[],['$_']},
	   {{'_','_','_'},[],['$_']}],
    ?line [_,_,_,_,_,_] = dets:select(T, Sp2),

    AllDeleteSpec = [{'_',[],[true]}],
    %% delete and insert while chunking
    %% (this case almost worthless after changes in OTP-5232)
    ?line 6 = dets:select_delete(T, AllDeleteSpec),
    L500 = seq(1, 500),
    Fun = fun(X) -> ok = dets:insert(T, {X, a, b, c, d}) end,
    ?line foreach(Fun, L500),
    %% Select one object DI in L3 below to be deleted.
    ?line {_, TmpCont} = dets:match_object(T, '_', 200),    
    ?line {_, TmpCont1} = dets:match_object(TmpCont),
    ?line {TTL, _} = dets:match_object(TmpCont1),
    ?line DI = if Version =:= 8 -> last(TTL); Version =:= 9 -> hd(TTL) end,
    ?line dets:safe_fixtable(T, true),
    ?line {L1, C20} = dets:select(T, AllSpec, 200),
    ?line true = 200 =< length(L1),
    ?line 0 = dets:select_delete(T, [{{2,'_','_'},[],[true]}]),
    ?line 1 = dets:select_delete(T, [{DI,[],[true]}]), % last object
    Tiny = {1050},
    ?line ok = dets:insert(T, Tiny),
    ?line true = member(Tiny, dets:select(T, AllSpec)),
    ?line {_L2, C21} = dets:select(C20),
    ?line {_L3, _C22} = dets:select(C21),
    %% It used to be that Tiny was not visible here, but since the 
    %% scanning of files was changed to inspect the free lists every
    %% now and then it may very well be visible here.
    %% ?line false = member(Tiny, _L3),
    %% DI used to visible here, but the above mentioned modification
    %% has changed that; it may or may not be visible.
    %% ?line true = member(DI, _L3),
    ?line true = dets:member(T, 1050),
    ?line true = member(Tiny, dets:select(T, AllSpec)),
    ?line false = member(DI, dets:select(T, AllSpec)),
    ?line dets:safe_fixtable(T, false),
    ?line true = dets:member(T, 1050),
    ?line true = member(Tiny, dets:select(T, AllSpec)),
    ?line false = member(DI, dets:select(T, AllSpec)),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    %% The key is not fixed, but not all objects with the key are removed.
    ?line {ok, _} = dets:open_file(T, Args),
    ?line ok = dets:insert(T, [{1,a},{1,b},{1,c},{1,a},{1,b},{1,c}]),
    ?line 6 = dets:info(T, size),
    ?line 2 = dets:select_delete(T, [{{'_',a},[],[true]}]),
    ?line 4 = dets:info(T, size),
    ?line [{1,b},{1,b},{1,c},{1,c}] = sort(dets:select(T, AllSpec)),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    ?line check_pps(P0),
    ok.

update_counter(doc) ->
    ["Test update_counter/1."];
update_counter(suite) ->
    [];
update_counter(Config) when is_list(Config) ->
    T = update_counter,
    ?line Fname = filename(select, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    ?line {'EXIT', {badarg, [{dets,update_counter,[no_table,1,1],_}|_]}} =
	(catch dets:update_counter(no_table, 1, 1)),

    Args = [{file,Fname},{keypos,2}],
    ?line {ok, _} = dets:open_file(T, [{type,set} | Args]),
    ?line {'EXIT', {badarg, _}} = (catch dets:update_counter(T, 1, 1)),
    ?line ok = dets:insert(T, {1,a}),
    ?line {'EXIT', {badarg, _}} = (catch dets:update_counter(T, 1, 1)),
    ?line ok = dets:insert(T, {0,1}),
    ?line {'EXIT', {badarg, _}} = (catch dets:update_counter(T, 1, 1)),
    ?line ok = dets:insert(T, {0,1,0}),
    ?line 1 = dets:update_counter(T, 1, 1),
    ?line 2 = dets:update_counter(T, 1, 1),
    ?line 6 = dets:update_counter(T, 1, {3,4}),
    ?line {'EXIT', {badarg, _}} = (catch dets:update_counter(T, 1, {0,3})),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),

    ?line {ok, _} = dets:open_file(T, [{type,bag} | Args]),
    ?line ok = dets:insert(T, {0,1,0}),
    ?line {'EXIT', {badarg, _}} = (catch dets:update_counter(T, 1, 1)),
    ?line ok = dets:close(T),
    ?line file:delete(Fname),
    ?line check_pps(P0),

    ok.

badarg(doc) ->
    ["Call some functions with bad arguments."];
badarg(suite) ->
    [];
badarg(Config) when is_list(Config) ->
    T = badarg,
    ?line Fname = filename(select, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    Args = [{file,Fname},{keypos,3}],
    ?line {ok, _} = dets:open_file(T, [{type,set} | Args]),
    % ?line dets:verbose(),

    %% badargs are tested in match, select and fixtable too.

    %% open
    ?line {'EXIT', {badarg, [{dets,open_file,[{a,tuple},[]],_}|_]}} =
	(catch dets:open_file({a,tuple},[])),
    ?line {'EXIT', {badarg, [{dets,open_file,[{a,tuple}],_}|_]}} =
	(catch dets:open_file({a,tuple})),
    ?line {'EXIT', {badarg, [{dets,open_file,[file,[foo]],_}|_]}} =
	(catch dets:open_file(file,[foo])),
    ?line {'EXIT', {badarg,[{dets,open_file,
			     [{hej,san},[{type,set}|3]],_}|_]}} =
	(catch dets:open_file({hej,san},[{type,set}|3])),

    %% insert
    ?line {'EXIT', {badarg, [{dets,insert,[no_table,{1,2}],_}|_]}} =
	(catch dets:insert(no_table, {1,2})),
    ?line {'EXIT', {badarg, [{dets,insert,[no_table,[{1,2}]],_}|_]}} =
	(catch dets:insert(no_table, [{1,2}])),
    ?line {'EXIT', {badarg, [{dets,insert,[T,{1,2}],_}|_]}} =
	(catch dets:insert(T, {1,2})),
    ?line {'EXIT', {badarg, [{dets,insert,[T,[{1,2}]],_}|_]}} =
	(catch dets:insert(T, [{1,2}])),
    ?line {'EXIT', {badarg, [{dets,insert,[T,[{1,2,3}|3]],_}|_]}} =
	      (catch dets:insert(T, [{1,2,3} | 3])),

    %% lookup{_keys}
    ?line {'EXIT', {badarg, [{dets,lookup_keys,[badarg,[]],_}|_]}} =
	(catch dets:lookup_keys(T, [])),
    ?line {'EXIT', {badarg, [{dets,lookup,[no_table,1],_}|_]}} =
	(catch dets:lookup(no_table, 1)),
    ?line {'EXIT', {badarg, [{dets,lookup_keys,[T,[1|2]],_}|_]}} =
	(catch dets:lookup_keys(T, [1 | 2])),

    %% member
    ?line {'EXIT', {badarg, [{dets,member,[no_table,1],_}|_]}} =
	(catch dets:member(no_table, 1)),

    %% sync
    ?line {'EXIT', {badarg, [{dets,sync,[no_table],_}|_]}} =
	(catch dets:sync(no_table)),

    %% delete{_keys}
    ?line {'EXIT', {badarg, [{dets,delete,[no_table,1],_}|_]}} =
	(catch dets:delete(no_table, 1)),

    %% delete_object
    ?line {'EXIT', {badarg, [{dets,delete_object,[no_table,{1,2,3}],_}|_]}} =
	(catch dets:delete_object(no_table, {1,2,3})),
    ?line {'EXIT', {badarg, [{dets,delete_object,[T,{1,2}],_}|_]}} =
	(catch dets:delete_object(T, {1,2})),
    ?line {'EXIT', {badarg, [{dets,delete_object,[no_table,[{1,2,3}]],_}|_]}} =
	(catch dets:delete_object(no_table, [{1,2,3}])),
    ?line {'EXIT', {badarg, [{dets,delete_object,[T,[{1,2}]],_}|_]}} =
	(catch dets:delete_object(T, [{1,2}])),
    ?line {'EXIT', {badarg, [{dets,delete_object,[T,[{1,2,3}|3]],_}|_]}} =
	(catch dets:delete_object(T, [{1,2,3} | 3])),

    %% first,next,slot
    ?line {'EXIT', {badarg, [{dets,first,[no_table],_}|_]}} =
	(catch dets:first(no_table)),
    ?line {'EXIT', {badarg, [{dets,next,[no_table,1],_}|_]}} =
	(catch dets:next(no_table, 1)),
    ?line {'EXIT', {badarg, [{dets,slot,[no_table,0],_}|_]}} =
	(catch dets:slot(no_table, 0)),

    %% info
    ?line undefined = dets:info(no_table),
    ?line undefined = dets:info(no_table, foo),
    ?line undefined = dets:info(T, foo),

    %% match_delete
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:match_delete(no_table, '_')),

    %% delete_all_objects
    ?line {'EXIT', {badarg, [{dets,delete_all_objects,[no_table],_}|_]}} =
	(catch dets:delete_all_objects(no_table)),

    %% select_delete
    MSpec = [{'_',[],['$_']}],
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:select_delete(no_table, MSpec)),
    ?line {'EXIT', {badarg, [{dets,select_delete,[T, <<17>>],_}|_]}} =
	(catch dets:select_delete(T, <<17>>)),

    %% traverse, fold
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:traverse(no_table, fun(_) -> continue end)),
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:foldl(fun(_, A) -> A end, [], no_table)),
    ?line {'EXIT', {badarg, [{dets,safe_fixtable,[no_table,true],_}|_]}} =
	(catch dets:foldr(fun(_, A) -> A end, [], no_table)),

    %% close
    ?line ok = dets:close(T),
    ?line {error, not_owner} = dets:close(T),
    ?line {error, not_owner} = dets:close(T),

    %% init_table
    ?line {'EXIT', {badarg,[{dets,init_table,[no_table,_,[]],_}|_]}} =
	(catch dets:init_table(no_table, fun(X) -> X end)),
    ?line {'EXIT', {badarg,[{dets,init_table,[no_table,_,[]],_}|_]}} =
	(catch dets:init_table(no_table, fun(X) -> X end, [])),

    %% from_ets
    Ets = ets:new(ets,[]),
    ?line {'EXIT', {badarg,[{dets,from_ets,[no_table,_],_}|_]}} =
	(catch dets:from_ets(no_table, Ets)),
    ets:delete(Ets),

    ?line {ok, T} = dets:open_file(T, Args),
    ?line {error,incompatible_arguments} = 
	dets:open_file(T, [{type,bag} | Args]),
    ?line ok = dets:close(T),

    file:delete(Fname),
    ?line check_pps(P0),
    ok.

cache_sets_v8(doc) ->
    ["Test the write cache for sets."];
cache_sets_v8(suite) ->
    [];
cache_sets_v8(Config) when is_list(Config) ->
    cache_sets(Config, 8).

cache_sets_v9(doc) ->
    ["Test the write cache for sets."];
cache_sets_v9(suite) ->
    [];
cache_sets_v9(Config) when is_list(Config) ->
    cache_sets(Config, 9).

cache_sets(Config, Version) ->
    Small = 2,
    cache_sets(Config, {0,0}, false, Small, Version),
    cache_sets(Config, {0,0}, true, Small, Version),
    cache_sets(Config, {5000,5000}, false, Small, Version),
    cache_sets(Config, {5000,5000}, true, Small, Version),
    %% Objects of size greater than 2 kB.
    Big = 1200,
    cache_sets(Config, {0,0}, false, Big, Version),
    cache_sets(Config, {0,0}, true, Big, Version),
    cache_sets(Config, {5000,5000}, false, Big, Version),
    cache_sets(Config, {5000,5000}, true, Big, Version),
    ok.
    
cache_sets(Config, DelayedWrite, Extra, Sz, Version) ->
    %% Extra = bool(). Insert tuples until the tested key is not alone.
    %% Sz = integer(). Size of the inserted tuples.

    T = cache,
    ?line Fname = filename(cache, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    ?line {ok, _} = 
	dets:open_file(T,[{version, Version}, {file,Fname}, {type,set}, 
			  {delayed_write, DelayedWrite}]),

    Dups = 1,
    {Key, OtherKeys} = 
	if 
	    Extra ->
		%% Insert enough to get three keys in some slot.
		?line dets:safe_fixtable(T, true),
		insert_objs(T, 1, Sz, Dups);
	    true ->
		{1,[]}
	  end,
    Tuple = erlang:make_tuple(Sz, Key),
    ?line ok = dets:delete(T, Key),
    ?line ok = dets:sync(T),    

    %% The values of keys in the same slot as Key are checked.
    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
    
    ?line ok = dets:insert(T, Tuple),
    ?line [Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:insert(T, [Tuple,Tuple]),
    %% If no delay, the cache gets filled immediately, and written.
    ?line [Tuple] = dets:lookup_keys(T, [Key,a,b,c,d,e,f]),
    ?line true = dets:member(T, Key),

    %% If delay, this happens without file access.
    ?line ok = dets:delete(T,Key),
    ?line ok = dets:insert(T,Tuple),
    ?line ok = dets:insert(T,Tuple),
    ?line [Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:sync(T),
    ?line [Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),

    %% Key's objects are is on file only, 
    %% key 'toto' in the cache (if there is one).
    ?line ok = dets:delete(T,toto),
    ?line ok = dets:insert(T,[{toto,b},{toto,b}]),
    ?line true = sort([Tuple,{toto,b}]) =:= 
                 sort(dets:lookup_keys(T, [Key,toto])),
    ?line true = dets:member(T, toto),

    ?line ok = dets:delete(T, Key),
    ?line ok = dets:sync(T),
    ?line false = dets:member(T, Key),
    ?line Size = dets:info(T, size),

    %% No object with the key on the file.
    %% Delete, add one object.
    Size1 = Size + 2,
    del_and_ins(key, T, Size1, Tuple, Key, 1),
    del_and_ins(object, T, Size1, Tuple, Key, 1),
    del_and_ins(both, T, Size1, Tuple, Key, 1),

    %% One object with the key on the file.
    %% Delete it, add one object.
    Size2 = Size + 2,
    del_and_ins(key, T, Size2, Tuple, Key, 1),
    del_and_ins(object, T, Size2, Tuple, Key, 1),
    del_and_ins(both, T, Size2, Tuple, Key, 1),

    %% Overwrite an old objekt with exactly the same size.
    Element = case element(2, Tuple) of
		  255 -> 254;
		  E -> E + 1
	      end,
    Tuple2 = setelement(2, Tuple, Element),
    ?line ok = dets:sync(T),
    ?line ok = dets:insert(T, Tuple2),
    ?line [Tuple2] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:sync(T),    
    ?line [Tuple2] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),

    ?line ok = dets:insert(T, {3,a}),
    ?line ok = dets:insert(T, {3,b}),
    ?line ok = dets:delete_object(T, {3,c}),
    ?line ok = dets:delete_object(T, {3,d}),
    ?line [{3,b}] = dets:lookup(T, 3),

    ?line ok = dets:delete(T, 3),
    ?line ok = dets:delete_object(T, {3,c}),
    ?line ok = dets:delete_object(T, {3,d}),
    ?line [] = dets:lookup(T, 3),

    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
    if
	Extra ->
	    %% Let the table grow a while, if it needs to.
	    ?line All1 = get_all_objects(T),
	    ?line dets:safe_fixtable(T, false),
	    ?line timer:sleep(1000),
	    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
	    ?line dets:safe_fixtable(T, true),
	    ?line All2 = get_all_objects(T),
	    ?line FAll2 = get_all_objects_fast(T),
	    ?line true = sort(All2) =:= sort(FAll2),
            case symdiff(All1, All2) of
		{[],[]} ->  ok;
		{X,Y} ->
		    NoBad = length(X) + length(Y),
		    test_server:fail({sets,DelayedWrite,Extra,Sz,NoBad})
	    end;
	true ->
	    ok
    end,
    ?line ok = dets:close(T),

    file:delete(Fname),
    ?line check_pps(P0),
    ok.
    
cache_bags_v8(doc) ->
    ["Test the write cache for bags."];
cache_bags_v8(suite) ->
    [];
cache_bags_v8(Config) when is_list(Config) ->
    cache_bags(Config, 8).

cache_bags_v9(doc) ->
    ["Test the write cache for bags."];
cache_bags_v9(suite) ->
    [];
cache_bags_v9(Config) when is_list(Config) ->
    cache_bags(Config, 9).

cache_bags(Config, Version) ->
    Small = 2,
    cache_bags(Config, {0,0}, false, Small, Version),
    cache_bags(Config, {0,0}, true, Small, Version),
    cache_bags(Config, {5000,5000}, false, Small, Version),
    cache_bags(Config, {5000,5000}, true, Small, Version),
    %% Objects of size greater than 2 kB.
    Big = 1200,
    cache_bags(Config, {0,0}, false, Big, Version),
    cache_bags(Config, {0,0}, true, Big, Version),
    cache_bags(Config, {5000,5000}, false, Big, Version),
    cache_bags(Config, {5000,5000}, true, Big, Version),
    ok.
    
cache_bags(Config, DelayedWrite, Extra, Sz, Version) ->
    %% Extra = bool(). Insert tuples until the tested key is not alone.
    %% Sz = integer(). Size of the inserted tuples.

    T = cache,
    ?line Fname = filename(cache, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    ?line {ok, _} = 
	dets:open_file(T,[{version, Version}, {file,Fname}, {type,bag}, 
			  {delayed_write, DelayedWrite}]),

    Dups = 1,
    {Key, OtherKeys} = 
	if 
	    Extra ->
		%% Insert enough to get three keys in some slot.
		?line dets:safe_fixtable(T, true),
		insert_objs(T, 1, Sz, Dups);
	    true ->
		{1,[]}
	  end,
    Tuple = erlang:make_tuple(Sz, Key),
    ?line ok = dets:delete(T, Key),
    ?line ok = dets:sync(T),    

    %% The values of keys in the same slot as Key are checked.
    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
    
    ?line ok = dets:insert(T, Tuple),
    ?line [Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:insert(T, [Tuple,Tuple]),
    %% If no delay, the cache gets filled immediately, and written.
    ?line [Tuple] = dets:lookup_keys(T, [Key,a,b,c,d,e,f]),
    ?line true = dets:member(T, Key),

    %% If delay, this happens without file access. 
    %% (This is no longer true; cache lookup has been simplified.)
    ?line ok = dets:delete(T,Key),
    ?line ok = dets:insert(T,Tuple),
    ?line ok = dets:insert(T,Tuple),
    ?line [Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:sync(T),
    ?line [Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),

    %% Key's objects are is on file only, 
    %% key toto in the cache (if there is one).
    ?line ok = dets:delete(T,toto),
    ?line false = dets:member(T, toto),
    ?line ok = dets:insert(T,[{toto,b},{toto,b}]),
    ?line true = sort([Tuple,{toto,b}]) =:= 
                 sort(dets:lookup_keys(T, [Key,toto])),
    ?line true = dets:member(T, toto),

    ?line ok = dets:delete(T, Key),
    ?line ok = dets:sync(T),
    ?line Size = dets:info(T, size),

    %% No object with the key on the file.
    %% Delete, add one object.
    Size1 = Size + 2,
    del_and_ins(key, T, Size1, Tuple, Key, 1),
    del_and_ins(object, T, Size1, Tuple, Key, 1),
    del_and_ins(both, T, Size1, Tuple, Key, 1),

    %% One object with the key on the file.
    %% Delete it, add one object.
    Size2 = Size + 2,
    del_and_ins(key, T, Size2, Tuple, Key, 1),
    del_and_ins(object, T, Size2, Tuple, Key, 1),
    del_and_ins(both, T, Size2, Tuple, Key, 1),

    %% Overwrite an objekt on file with the same object.
    ?line ok = dets:insert(T, Tuple),
    ?line ok = dets:sync(T),
    ?line [Tuple2] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:insert(T, Tuple),
    ?line ok = dets:sync(T),
    ?line [Tuple2] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),

    %% A mix of insert and delete.
    ?line ok = dets:delete(T, Key),
    ?line ok = dets:sync(T),
    ?line ok = dets:delete(T, Key),
    ?line ok = dets:insert(T, {Key,foo}),
    ?line ok = dets:insert(T, {Key,bar}),
    ?line [{Key,bar},{Key,foo}] = sort(dets:lookup(T, Key)),
    ?line true = dets:member(T, Key),
    ?line ok = dets:delete_object(T, {Key,foo}),
    ?line ok = dets:insert(T, {Key,kar}),
    ?line [{Key,bar},{Key,kar}] = sort(dets:lookup(T, Key)),
    ?line true = dets:member(T, Key),
    ?line ok = dets:insert(T, [{Key,kar},{Key,kar}]),
    ?line [{Key,bar},{Key,kar}] = sort(dets:lookup(T, Key)),
    ?line true = dets:member(T, Key),
    ?line ok = dets:delete_object(T, {Key,bar}),
    ?line ok = dets:delete_object(T, {Key,kar}),
    ?line [] = dets:lookup(T, Key),
    ?line false = dets:member(T, Key),
    ?line ok = dets:sync(T),
    ?line [] = dets:lookup(T, Key),
    ?line false = dets:member(T, Key),

    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
    if
	Extra ->
	    %% Let the table grow for a while, if it needs to.
	    ?line All1 = get_all_objects(T),
	    ?line dets:safe_fixtable(T, false),
	    ?line timer:sleep(1200),
	    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
	    ?line dets:safe_fixtable(T, true),
	    ?line All2 = get_all_objects(T),
	    ?line FAll2 = get_all_objects_fast(T),
	    ?line true = sort(All2) =:= sort(FAll2),
            case symdiff(All1, All2) of
		{[],[]} ->  ok;
		{X,Y} ->
		    NoBad = length(X) + length(Y),
		    test_server:fail({bags,DelayedWrite,Extra,Sz,NoBad})
	    end;
	true ->
	    ok
    end,
    ?line ok = dets:close(T),
    file:delete(Fname),

    %% Second object of a key added and looked up simultaneously.
    R1 = {index_test,1,2,3,4},
    R2 = {index_test,2,2,13,14},
    R3 = {index_test,1,12,13,14},
    ?line {ok, _} = dets:open_file(T,[{version,Version},{type,bag},
				      {keypos,2},{file,Fname}]),
    ?line ok = dets:insert(T,R1),
    ?line ok = dets:sync(T),
    ?line ok = dets:insert(T,R2),
    ?line ok = dets:sync(T),
    ?line ok = dets:insert(T,R3),
    ?line [R1,R3] = sort(dets:lookup(T,1)),
    ?line true = dets:member(T, 1),
    ?line [R1,R3] = sort(dets:lookup(T,1)),
    ?line true = dets:member(T, 1),
    ?line ok = dets:close(T),
    file:delete(Fname),

    ?line check_pps(P0),
    ok.
    
cache_duplicate_bags_v8(doc) ->
    ["Test the write cache for duplicate bags."];
cache_duplicate_bags_v8(suite) ->
    [];
cache_duplicate_bags_v8(Config) when is_list(Config) ->
    cache_duplicate_bags(Config, 8).

cache_duplicate_bags_v9(doc) ->
    ["Test the write cache for duplicate bags."];
cache_duplicate_bags_v9(suite) ->
    [];
cache_duplicate_bags_v9(Config) when is_list(Config) ->
    cache_duplicate_bags(Config, 9).

cache_duplicate_bags(Config, Version) ->
    Small = 2,
    cache_dup_bags(Config, {0,0}, false, Small, Version),
    cache_dup_bags(Config, {0,0}, true, Small, Version),
    cache_dup_bags(Config, {5000,5000}, false, Small, Version),
    cache_dup_bags(Config, {5000,5000}, true, Small, Version),
    %% Objects of size greater than 2 kB.
    Big = 1200,
    cache_dup_bags(Config, {0,0}, false, Big, Version),
    cache_dup_bags(Config, {0,0}, true, Big, Version),
    cache_dup_bags(Config, {5000,5000}, false, Big, Version),
    cache_dup_bags(Config, {5000,5000}, true, Big, Version).

cache_dup_bags(Config, DelayedWrite, Extra, Sz, Version) ->
    %% Extra = bool(). Insert tuples until the tested key is not alone.
    %% Sz = integer(). Size of the inserted tuples.

    T = cache,
    ?line Fname = filename(cache, Config),
    ?line file:delete(Fname),
    P0 = pps(),

    ?line {ok, _} = 
	dets:open_file(T,[{version, Version}, {file,Fname}, 
			  {type,duplicate_bag}, 
			  {delayed_write, DelayedWrite}]),

    Dups = 2,
    {Key, OtherKeys} = 
	if 
	    Extra ->
		%% Insert enough to get three keys in some slot.
		?line dets:safe_fixtable(T, true),
		insert_objs(T, 1, Sz, Dups);
	    true ->
		{1,[]}
	  end,
    Tuple = erlang:make_tuple(Sz, Key),
    ?line ok = dets:delete(T, Key),
    ?line ok = dets:sync(T),    
    ?line false = dets:member(T, Key),

    %% The values of keys in the same slot as Key are checked.
    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
    
    ?line ok = dets:insert(T, Tuple),
    ?line [Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:insert(T, [Tuple,Tuple]),
    %% If no delay, the cache gets filled immediately, and written.
    ?line [Tuple,Tuple,Tuple] = dets:lookup_keys(T, [Key,a,b,c,d,e,f]),
    ?line true = dets:member(T, Key),

    %% If delay, this happens without file access.
    %% (This is no longer true; cache lookup has been simplified.)
    ?line ok = dets:delete(T,Key),
    ?line ok = dets:insert(T,Tuple),
    ?line ok = dets:insert(T,Tuple),
    ?line [Tuple,Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),
    ?line ok = dets:sync(T),
    ?line [Tuple,Tuple] = dets:lookup(T, Key),
    ?line true = dets:member(T, Key),

    %% One object in the cache, one on the file.
    ?line ok = dets:delete(T,Key),
    ?line ok = dets:insert(T,Tuple),
    ?line ok = dets:sync(T),
    ?line ok = dets:insert(T,Tuple),
    ?line true = dets:member(T, Key), % should not read the file, but it does..

    %% Key's objects are is on file only, 
    %% key toto in the cache (if there is one).
    ?line ok = dets:delete(T,toto),
    ?line ok = dets:insert(T,[{toto,b},{toto,b}]),
    ?line true = sort([Tuple,Tuple,{toto,b},{toto,b}]) =:= 
                 sort(dets:lookup_keys(T, [Key,toto])),
    ?line true = dets:member(T, toto),
    ?line Size = dets:info(T, size),

    %% Two objects with the same key on the file.
    %% Delete them, add two objects.
    del_and_ins(key, T, Size, Tuple, Key, 2),

    del_and_ins(object, T, Size, Tuple, Key, 2),
    del_and_ins(both, T, Size, Tuple, Key, 2),

    %% Two objects with the same key on the file.
    %% Delete them, add three objects.
    del_and_ins(key, T, Size, Tuple, Key, 3),
    del_and_ins(object, T, Size, Tuple, Key, 3),
    del_and_ins(both, T, Size, Tuple, Key, 3),

    %% Two objects with the same key on the file.
    %% Delete them, add one object.
    del_and_ins(key, T, Size, Tuple, Key, 1),
    del_and_ins(object, T, Size, Tuple, Key, 1),
    del_and_ins(both, T, Size, Tuple, Key, 1),

    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
    if
	Extra ->
	    %% Let the table grow for a while, if it needs to.
	    ?line All1 = get_all_objects(T),
	    ?line dets:safe_fixtable(T, false),
	    ?line timer:sleep(1200),
	    ?line OtherValues = sort(lookup_keys(T, OtherKeys)),
	    ?line dets:safe_fixtable(T, true),
	    ?line All2 = get_all_objects(T),
	    ?line FAll2 = get_all_objects_fast(T),
	    ?line true = sort(All2) =:= sort(FAll2),
            case symdiff(All1, All2) of
		{[],[]} ->  ok;
		{X,Y} ->
		    NoBad = length(X) + length(Y),
		    test_server:fail({dup_bags,DelayedWrite,Extra,Sz,NoBad})
	    end;
	true ->
	    ok
    end,
    ?line ok = dets:close(T),

    file:delete(Fname),
    ?line check_pps(P0),
    ok.
    
lookup_keys(_T, []) ->
    [];
lookup_keys(T, Keys) ->
    dets:lookup_keys(T, Keys).

del_and_ins(W, T, Size, Obj, Key, N) ->
    case W of
	object -> 
	    ?line ok = dets:delete_object(T, Obj);
	key ->

	    ?line ok = dets:delete(T, Key);
	both ->
	    ?line ok = dets:delete(T, Key),
	    ?line ok = dets:delete_object(T, Obj)
    end,
    Objs = duplicate(N, Obj),
    ?line [] = dets:lookup(T, Key),
    ?line ok = dets:insert(T, Objs),
    ?line Objs = dets:lookup_keys(T, [snurrespratt,Key]),
    ?line true = Size + length(Objs)-2 =:= dets:info(T, size),
    ?line Objs = dets:lookup(T, Key).


insert_objs(T, N, Sz, Dups) ->
    Seq = seq(N,N+255),
    L0 = map(fun(I) -> erlang:make_tuple(Sz, I) end, Seq),
    L = append(duplicate(Dups, L0)),
    ?line ok = dets:insert(T, L),
    ?line case search_slot(T, 0) of
	      false ->
		  insert_objs(T, N+256, Sz, Dups);
	      Keys ->
		  Keys
	  end.

search_slot(T, I) ->
    ?line case dets:slot(T, I) of
	      '$end_of_table' ->
		  false;
	      Objs ->
		  case usort(map(fun(X) -> element(1, X) end, Objs)) of
		      [_, Key, _ | _] = Keys0 ->
			  Keys = delete(Key, Keys0),
			  {Key, Keys};
		      _ ->
			  search_slot(T, I+1)
		  end
	  end.

symdiff(L1, L2) ->
    {X, _, Y} = 
	sofs:symmetric_partition(sofs:set(L1), sofs:set(L2)),
    {sofs:to_external(X), sofs:to_external(Y)}.

otp_4208(doc) ->
    ["Read only table and traversal caused crash."];
otp_4208(suite) ->
    [];
otp_4208(Config) when is_list(Config) ->
    Tab = otp_4208,
    ?line FName = filename(Tab, Config),
    Expected = sort([{3,ghi,12},{1,abc,10},{4,jkl,13},{2,def,11}]),

    file:delete(FName),
    ?line {ok, Tab} = dets:open_file(Tab, [{file,FName}]),
    ?line ok = dets:insert(Tab, [{1,abc,10},{2,def,11},{3,ghi,12},{4,jkl,13}]),
    ?line Expected = sort(dets:traverse(Tab, fun(X) -> {continue, X} end)),
    ?line ok = dets:close(Tab),

    ?line {ok, Tab} = dets:open_file(Tab, [{access, read},{file,FName}]),
    ?line Expected = sort(dets:traverse(Tab, fun(X) -> {continue, X} end)),
    ?line ok = dets:close(Tab),
    file:delete(FName),
    
    ok.

otp_4989(doc) ->
    ["Read only table and growth."];
otp_4989(suite) ->
    [];
otp_4989(Config) when is_list(Config) ->
    Tab = otp_4989,
    ?line FName = filename(Tab, Config),

    %% Do exactly as in the error report.
    ?line _Ets = ets:new(Tab, [named_table]),
    ets_init(Tab, 100000),
    ?line {ok, Tab} = 
        dets:open_file(Tab, [{access, read_write}, {file,FName}, {keypos,2}]),
    ?line ok = dets:from_ets(Tab, Tab),
    ?line ok = dets:close(Tab),
    %% Restore.
    ?line  {ok, Tab} = 
        dets:open_file(Tab, [{access, read}, {keypos, 2}, {file, FName}]),
    ?line true = ets:delete_all_objects(Tab),
    ?line true = ets:from_dets(Tab, Tab),
    ?line ok = dets:close(Tab),
    ets:delete(Tab),
    file:delete(FName),
    ok.

ets_init(_Tab, 0) ->
    ok;
ets_init(Tab, N) ->
    ets:insert(Tab, {N,N}),
    ets_init(Tab, N - 1).

otp_8898(doc) ->
    ["OTP-8898. Truncated Dets file."];
otp_8898(suite) ->
    [];
otp_8898(Config) when is_list(Config) ->
    Tab = otp_8898,
    ?line FName = filename(Tab, Config),

    Server = self(),

    ?line file:delete(FName),
    ?line {ok, _} = dets:open_file(Tab,[{file, FName}]),
    ?line [P1,P2,P3] = new_clients(3, Tab),

    Seq = [{P1,[sync]},{P2,[{lookup,1,[]}]},{P3,[{insert,{1,b}}]}],
    ?line atomic_requests(Server, Tab, [[]], Seq),
    ?line true = get_replies([{P1,ok},{P2,ok},{P3,ok}]),
    ?line ok = dets:close(Tab),
    ?line {ok, _} = dets:open_file(Tab,[{file, FName}]),
    ?line file:delete(FName),

    ok.

otp_8899(doc) ->
    ["OTP-8899. Several clients. Updated Head was ignored."];
otp_8899(suite) ->
    [];
otp_8899(Config) when is_list(Config) ->
    Tab = many_clients,
    ?line FName = filename(Tab, Config),

    Server = self(),

    ?line file:delete(FName),
    ?line {ok, _} = dets:open_file(Tab,[{file, FName},{version,9}]),
    ?line [P1,P2,P3,P4] = new_clients(4, Tab),

    MC = [Tab],
    Seq6a = [{P1,[{insert,[{used_to_be_skipped_by,match}]},
                  {lookup,1,[{1,a}]}]},
             {P2,[{verbose,true,MC}]},
             {P3,[{lookup,1,[{1,a}]}]}, {P4,[{verbose,true,MC}]}],
    ?line atomic_requests(Server, Tab, [[{1,a},{2,b},{3,c}]], Seq6a),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),
    ?line [{1,a},{2,b},{3,c},{used_to_be_skipped_by,match}] =
        lists:sort(dets:match_object(Tab, '_')),
    ?line _ = dets:close(Tab),
    ?line file:delete(FName),

    ok.

many_clients(doc) ->
    ["Several clients accessing a table simultaneously."];
many_clients(suite) ->
    [];
many_clients(Config) when is_list(Config) ->
    Tab = many_clients,
    ?line FName = filename(Tab, Config),

    Server = self(),

    ?line file:delete(FName),
    P0 = pps(),
    ?line {ok, _} = dets:open_file(Tab,[{file, FName},{version,9}]),
    ?line [P1,P2,P3,P4] = new_clients(4, Tab),

    %% dets:init_table/2 is used for making sure that all processes
    %% start sending requests before the Dets process begins to handle
    %% them; the requests arrive "in parallel".

    %% Four processes accessing the same table at almost the same time.

    %% One key is read, updated, and read again.
    Seq1 = [{P1,[{lookup,1,[{1,a}]}]}, {P2,[{insert,{1,b}}]},
	    {P3,[{lookup,1,[{1,b}]}]}, {P4,[{lookup,1,[{1,b}]}]}],
    ?line atomic_requests(Server, Tab, [[{1,a}]], Seq1),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),

    %% Different keys read by different processes
    Seq2 = [{P1,[{member,1,true}]}, {P2,[{lookup,2,[{2,b}]}]},
	    {P3,[{lookup,1,[{1,a}]}]}, {P4,[{lookup,3,[{3,c}]}]}],
    ?line atomic_requests(Server, Tab, [[{1,a},{2,b},{3,c}]], Seq2),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),

    %% Reading deleted key.
    Seq3 = [{P1,[{delete_key,2}]}, {P2,[{lookup,1,[{1,a}]}]},
	    {P3,[{lookup,1,[{1,a}]}]}, {P4,[{member,2,false}]}],
    ?line atomic_requests(Server, Tab, [[{1,a},{2,b},{3,c}]], Seq3),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),

    %% Inserting objects.
    Seq4 = [{P1,[{insert,[{1,a},{2,b}]}]}, {P2,[{insert,[{2,c},{3,a}]}]},
	    {P3,[{insert,[{3,b},{4,d}]}]},
	    {P4,[{lookup_keys,[1,2,3,4],[{1,a},{2,c},{3,b},{4,d}]}]}],
    ?line atomic_requests(Server, Tab, [], Seq4),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),

    %% Deleting objects.
    Seq5 = [{P1,[{delete_object,{1,a}}]}, {P2,[{delete_object,{1,a}}]},
	    {P3,[{delete_object,{3,c}}]},
	    {P4,[{lookup_keys,[1,2,3,4],[{2,b}]}]}],
    ?line atomic_requests(Server, Tab, [[{1,a},{2,b},{3,c}]], Seq5),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),

    %% Some request not streamed.
    Seq6 = [{P1,[{lookup,1,[{1,a}]}]}, {P2,[{info,size,3}]},
	    {P3,[{lookup,1,[{1,a}]}]}, {P4,[{info,size,3}]}],
    ?line atomic_requests(Server, Tab, [[{1,a},{2,b},{3,c}]], Seq6),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),

    %% Some request not streamed.
    Seq7 = [{P1,[{insert,[{3,a}]}]}, {P2,[{insert,[{3,b}]}]},
	    {P3,[{delete_object,{3,c}}]},
	    {P4,[{lookup,3,[{3,b}]}]}],
    ?line atomic_requests(Server, Tab, [[{3,c}]], Seq7),
    ?line true = get_replies([{P1,ok}, {P2,ok}, {P3,ok}, {P4,ok}]),

    ?line put_requests(Server, [{P1,stop},{P2,stop},{P3,stop},{P4,stop}]),
    ?line ok = dets:close(Tab),
    ?line file:delete(FName),

    %% Check that errors are handled correctly by the streaming operators.
    ?line {ok, _} = dets:open_file(Tab,[{file, FName},{version,9}]),
    ?line ok = ins(Tab, 100),
    Obj = {66,{item,number,66}},
    ?line {ok, ObjPos} = dets:where(Tab, Obj),
    ?line ok = dets:close(Tab),
    %% Damaged object.
    crash(FName, ObjPos+12),
    ?line {ok, _} = dets:open_file(Tab,[{file, FName},{version,9}]),
    ?line BadObject1 = dets:lookup_keys(Tab, [65,66,67,68,69]),
    ?line bad_object(BadObject1, FName),
    ?line _Error = dets:close(Tab),
    ?line file:delete(FName),

    ?line check_pps(P0),

    ok.

%% Tab is initiated with the objects in Objs. Objs = [[object()]].
atomic_requests(Server, Tab, Objs, Req) ->
    ok = dets:init_table(Tab, atomic_requests(Server, Objs, Req)).

atomic_requests(Server, L, Req) ->
    fun(close) ->
	    ok;
       (read) when [] =:= L ->
	    put_requests(Server, Req),
	    end_of_input;
       (read) ->
	    [E | Es] = L,
	    {E, atomic_requests(Server, Es, Req)}
    end.

put_requests(Server, L) ->
    lists:foreach(fun({Pid,R}) -> Pid ! {Server,R}, timer:sleep(1) end, L).

get_replies(L) ->
    lists:all(fun({Pid,Reply}) -> Reply =:= get_reply(Pid) end, L).

get_reply(Pid) ->
    ?line receive {Pid, Reply} -> Reply end.

new_clients(0, _Tab) ->
    [];
new_clients(N, Tab) ->
    [new_client(Tab) | new_clients(N-1, Tab)].

new_client(Tab) ->
    spawn(?MODULE, client, [self(), Tab]).

client(S, Tab) ->
    receive 
	{S, stop} ->
	    exit(normal);
	{S, ToDo} ->
	    ?line Reply = eval(ToDo, Tab),
	    case Reply of
		{error, _} -> io:format("~p: ~p~n", [self(), Reply]);
		_ -> ok
	    end,
	    S ! {self(), Reply}
    end,
    client(S, Tab).

eval([], _Tab) ->
    ok;
eval([{verbose,Bool,Expected} | L], Tab) ->
    ?line case dets:verbose(Bool) of
	      Expected -> eval(L, Tab);
	      Error -> {error, {verbose,Error}}
	  end;
eval([sync | L], Tab) ->
    ?line case dets:sync(Tab) of
	      ok -> eval(L, Tab);
	      Error -> {error, {sync,Error}}
	  end;
eval([{insert,Stuff} | L], Tab) ->
    ?line case dets:insert(Tab, Stuff) of
	      ok -> eval(L, Tab);
	      Error -> {error, {insert,Stuff,Error}}
	  end;
eval([{lookup,Key,Expected} | L], Tab) ->
    ?line case dets:lookup(Tab, Key) of
	      Expected -> eval(L, Tab);
	      Else -> {error, {lookup,Key,Expected,Else}}
	  end;
eval([{lookup_keys,Keys,Expected} | L], Tab) ->
    %% Time order is destroyed...
    ?line case dets:lookup_keys(Tab, Keys) of
	      R when is_list(R) -> 
		  case lists:sort(Expected) =:= lists:sort(R) of
		      true -> eval(L, Tab);
		      false -> {error, {lookup_keys,Keys,Expected,R}}
		  end;
	      Else -> {error, {lookup_keys,Keys,Expected,Else}}
	  end;
eval([{member,Key,Expected} | L], Tab) ->
    ?line case dets:member(Tab, Key) of
	      Expected -> eval(L, Tab);
	      Else -> {error, {member,Key,Expected,Else}}
	  end;
eval([{delete_key,Key} | L], Tab) ->
    ?line case dets:delete(Tab, Key) of
	      ok -> eval(L, Tab);
	      Else -> {error, {delete_key,Key,Else}}
	  end;
eval([{delete_object,Object} | L], Tab) ->
    ?line case dets:delete_object(Tab, Object) of
	      ok -> eval(L, Tab);
	      Else -> {error, {delete_object,Object,Else}}
	  end;
eval([{info,Tag,Expected} | L], Tab) ->
    ?line case dets:info(Tab, Tag) of
	      Expected -> eval(L, Tab);
	      Else -> {error, {info,Tag,Else,Expected}}
	  end;
eval(Else, _Tab) ->
    {error, {bad_request,Else}}.

otp_4906(doc) ->
    ["More than 128k keys caused crash."];
otp_4906(suite) ->
    [];
otp_4906(Config) when is_list(Config) ->
    N = 256*512 + 400,
    Tab = otp_4906,
    ?line FName = filename(Tab, Config),
    
    file:delete(FName),
    ?line {ok, Tab} = dets:open_file(Tab, [{file, FName}]),
    ?line ok = ins_small(Tab, 0, N),
    ?line ok = dets:close(Tab),
    ?line {ok, Tab} = dets:open_file(Tab, [{file, FName}]),
    ?line ok = read_4906(Tab, N-1),
    ?line ok = dets:close(Tab),
    file:delete(FName),

    %% If the (only) process fixing a table updates the table, the
    %% process will no longer be punished with a 1 ms delay (hm, the
    %% server is delayed, it should be the client...). In this example
    %% the writing process *is* delayed.
    ?line {ok,Tab} = dets:open_file(Tab, [{file,FName}]),
    Parent = self(),
    FixPid = spawn_link(fun() -> 
                                dets:safe_fixtable(Tab, true),
                                receive {Parent, stop} -> ok end
                        end),
    ?line ok = ins_small(Tab, 0, 1000),
    FixPid ! {Parent, stop},
    timer:sleep(1),
    ?line ok = dets:close(Tab),
    file:delete(FName),
    ok.

read_4906(_T, N) when N < 0 ->
    ok;
read_4906(T, N) ->
    ?line [_] = dets:lookup(T, N),
    read_4906(T, N-1).

ins_small(_T, I, N) when I =:= N ->
    ok;
ins_small(T, I, N) ->
    ?line ok = dets:insert(T, {I}),
    ins_small(T, I+1, N).

otp_5402(doc) ->
    ["Unwritable ramfile caused krasch."];
otp_5402(suite) ->
    [];
otp_5402(Config) when is_list(Config) ->
    Tab = otp_5402,
    ?line File = filename:join(["cannot", "write", "this", "file"]),

    %% close
    ?line{ok, T} = dets:open_file(Tab, [{ram_file,true},
                                        {file, File}]),
    ?line ok = dets:insert(T, {1,a}),
    ?line {error,{file_error,_,_}} = dets:close(T),

    %% sync
    ?line {ok, T} = dets:open_file(Tab, [{ram_file,true},
                                         {file, File}]),
    ?line ok = dets:insert(T, {1,a}),
    ?line {error,{file_error,_,_}} = dets:sync(T),
    ?line {error,{file_error,_,_}} = dets:close(T),

    %% auto_save
    ?line {ok, T} = dets:open_file(Tab, [{ram_file,true},
                                         {auto_save, 2000},
                                         {file, File}]),
    ?line ok = dets:insert(T, {1,a}),
    ?line timer:sleep(5000),
    ?line {error,{file_error,_,_}} = dets:close(T),
    ok.

simultaneous_open(doc) ->
    ["Several clients open and close tables simultaneously."];
simultaneous_open(suite) ->
    [];
simultaneous_open(Config) ->
    Tab = sim_open,
    File = filename(Tab, Config),
    
    ?line ok = monit(Tab, File),
    ?line ok = kill_while_repairing(Tab, File),
    ?line ok = kill_while_init(Tab, File),
    ?line ok = open_ro(Tab, File),
    ?line ok = open_w(Tab, File, 0, Config),
    ?line ok = open_w(Tab, File, 100, Config),
    ok.

%% One process logs and another process closes the log. Before
%% monitors were used, this would make the client never return.
monit(Tab, File) ->
    file:delete(File),
    {ok, Tab} = dets:open_file(Tab, [{file,File}]),
    F1 = fun() -> dets:close(Tab) end,
    F2 = fun() -> {'EXIT', {badarg, _}} = do_log(Tab) end,
    spawn(F2),
    timer:sleep(100),
    spawn(F1),
    dets:close(Tab),
    file:delete(File),
    ok.

do_log(Tab) ->
    case catch dets:insert(Tab, {hej,san,sa}) of
        ok -> do_log(Tab);
        Else -> Else
    end.

%% Kill the Dets process while repair is in progress.
kill_while_repairing(Tab, File) ->
    ?line create_opened_log(File),
    Delay = 1000,
    dets:start(),
    Parent = self(),
    Ps = processes(),
    F = fun() -> 
                R = (catch dets:open_file(Tab, [{file,File}])),
                timer:sleep(Delay),
                Parent ! {self(), R}
        end,
    ?line P1 = spawn(F), % will repair
    timer:sleep(100),
    ?line P2 = spawn(F), % pending...
    ?line P3 = spawn(F), % pending...
    ?line DetsPid = find_dets_pid([P1, P2, P3 | Ps]),
    exit(DetsPid, kill),

    ?line receive {P1,R1} -> {'EXIT', {dets_process_died, _}} = R1 end,
    ?line receive {P2,R2} -> {ok, _} = R2 end,
    ?line receive {P3,R3} -> {ok, _} = R3 end,

    timer:sleep(200),
    case dets:info(Tab) of
        undefined -> 
            ok;
        _Info ->
            timer:sleep(5000),
            ?line undefined = dets:info(Tab)
    end,

    file:delete(File),
    ok.

find_dets_pid(P0) ->
    case lists:sort(processes() -- P0) of
        [P, _] -> P;
        _ -> timer:sleep(100), find_dets_pid(P0)
    end.

%% Kill the Dets process when there are users and an on-going
%% initiailization.
kill_while_init(Tab, File) ->
    file:delete(File),
    Parent = self(),
    F = fun() -> 
                R = dets:open_file(Tab, [{file,File}]),
                Parent ! {self(), R},
                receive {Parent, die} -> ok end,
                {error, not_owner} = dets:close(Tab)
        end,
    ?line P1 = spawn(F),
    ?line P2 = spawn(F),
    ?line P3 = spawn(F),
    IF = fun() ->
                 R = dets:open_file(Tab, [{file,File}]),
                 Parent ! {self(), R},
                 Fun = fun(_) -> timer:sleep(100000) end,
                 {'EXIT', {badarg, _}} = (catch dets:init_table(Tab, Fun)),
                 receive {Parent, die} -> ok end
          end,
    ?line P4 = spawn(IF),
    ?line receive {P1,R1} -> {ok, _} = R1 end,
    ?line receive {P2,R2} -> {ok, _} = R2 end,
    ?line receive {P3,R3} -> {ok, _} = R3 end,
    ?line receive {P4,R4} -> {ok, _} = R4 end,
    ?line [DetsPid] = 
        lists:filter(fun(P) -> dets:pid2name(P) =/= undefined end, 
                     erlang:processes()),
    exit(DetsPid, kill),
    
    timer:sleep(1000),
    ?line undefined = dets:info(Tab),
    ?line P1 ! {Parent, die},
    ?line P2 ! {Parent, die},
    ?line P3 ! {Parent, die},
    ?line P4 ! {Parent, die},

    file:delete(File),
    timer:sleep(100),
    ok.

open_ro(Tab, File) ->
    ?line create_opened_log(File),
    Delay = 1000,
    Parent = self(),
    F = fun() ->
                R = dets:open_file(Tab, [{file,File},{access,read}]),
                timer:sleep(Delay),
                Parent ! {self(), R}
        end,
    ?line P1 = spawn(F),
    ?line P2 = spawn(F),
    ?line P3 = spawn(F),
    
    ?line receive {P1,R1} -> {error,{not_closed,_}} = R1 end,
    ?line receive {P2,R2} -> {error,{not_closed,_}} = R2 end,
    ?line receive {P3,R3} -> {error,{not_closed,_}} = R3 end,
    ok.

open_w(Tab, File, Delay, Config) ->
    ?line create_opened_log(File),
    Parent = self(),
    F = fun() -> 
                R = dets:open_file(Tab, [{file,File}]),
                timer:sleep(Delay),
                Parent ! {self(), R}
        end,
    ?line Pid1 = spawn(F),
    ?line Pid2 = spawn(F),
    ?line Pid3 = spawn(F),
    ?line undefined = dets:info(Tab), % is repairing now
    ?line 0 = qlen(),

    Tab2 = t2,
    File2 = filename(Tab2, Config),
    ?line file:delete(File2),
    ?line {ok,Tab2} = dets:open_file(Tab2, [{file,File2}]),
    ?line ok = dets:close(Tab2),
    ?line file:delete(File2),
    ?line 0 = qlen(), % still repairing

    ?line receive {Pid1,R1} -> {ok, Tab} = R1 end,
    ?line receive {Pid2,R2} -> {ok, Tab} = R2 end,
    ?line receive {Pid3,R3} -> {ok, Tab} = R3 end,
    timer:sleep(200),
    case dets:info(Tab) of
        undefined -> 
            ok;
        _Info ->
            timer:sleep(5000),
            ?line undefined = dets:info(Tab)
    end,

    file:delete(File),
    ok.

qlen() ->
    {_, {_, N}} = lists:keysearch(message_queue_len, 1, process_info(self())),
    N.

create_opened_log(File) ->
    Tab = t,
    file:delete(File),
    ?line {ok, Tab} = dets:open_file(Tab, [{file,File}]),
    ?line ok = ins(Tab, 60000),
    ?line ok = dets:close(Tab),
    ?line crash(File, ?CLOSED_PROPERLY_POS+3, ?NOT_PROPERLY_CLOSED),
    ok.

insert_new(doc) ->
    ["OTP-5075. insert_new/2"];
insert_new(suite) ->
    [];
insert_new(Config) ->
    Tab = insert_new,
    File = filename(Tab, Config),
    file:delete(File),
    ?line {ok, T} = dets:open_file(Tab, [{file,File}]),
    ?line {'EXIT', {badarg, _}} = (catch dets:insert_new(Tab, 14)),
    ?line {'EXIT', {badarg, _}} = (catch dets:insert_new(Tab, {})),
    ?line true = dets:insert_new(Tab, {1,a}),
    ?line false = dets:insert_new(Tab, {1,a}),
    ?line true = dets:insert_new(Tab, [{2,b}, {3,c}]),
    ?line false = dets:insert_new(Tab, [{2,b}, {3,c}]),
    ?line false = dets:insert_new(Tab, [{1,a}, {4,d}]),
    ?line ok = dets:close(Tab),

    file:delete(File),    
    ?line {ok, T} = dets:open_file(Tab, [{file,File},{type,bag}]),
    ?line true = dets:insert_new(Tab, {1,a}),
    ?line false = dets:insert_new(Tab, {1,b}),
    ?line true = dets:insert_new(Tab, [{2,b}, {3,c}]),
    ?line false = dets:insert_new(Tab, [{2,a}, {3,d}]),
    ?line false = dets:insert_new(Tab, [{1,a}, {4,d}]),
    ?line ok = dets:close(Tab),
    

    file:delete(File),
    ok.
    
repair_continuation(doc) ->
    ["OTP-5126. repair_continuation/2"];
repair_continuation(suite) ->
    [];
repair_continuation(Config) ->
    Tab = repair_continuation_table,
    ?line Fname = filename(repair_cont, Config),
    ?line file:delete(Fname),
    ?line {ok, _} = dets:open_file(Tab, [{file,Fname}]),
    ?line ok = dets:insert(Tab, [{1,a},{2,b},{3,c}]),

    ?line MS = [{'_',[],[true]}],

    ?line {[true], C1} = dets:select(Tab, MS, 1),
    ?line C2 = binary_to_term(term_to_binary(C1)),
    ?line {'EXIT', {badarg, _}} = (catch dets:select(C2)),
    ?line C3 = dets:repair_continuation(C2, MS),
    ?line {[true], C4} = dets:select(C3),
    ?line C5 = dets:repair_continuation(C4, MS),
    ?line {[true], _} = dets:select(C5),
    ?line {'EXIT', {badarg, _}} = (catch dets:repair_continuation(Tab, bu)),

    ?line ok = dets:close(Tab),
    ?line file:delete(Fname),
    ok.

otp_5487(doc) ->
    ["OTP-5487. Growth of read-only table (again)."];
otp_5487(suite) ->
    [];
otp_5487(Config) ->
    otp_5487(Config, 9),
    otp_5487(Config, 8),
    ok.

otp_5487(Config, Version) ->
    Tab = otp_5487,
    ?line Fname = filename(otp_5487, Config),
    ?line file:delete(Fname),
    ?line Ets = ets:new(otp_5487, [public, set]),
    ?line lists:foreach(fun(I) -> ets:insert(Ets, {I,I+1}) end,
                        lists:seq(0,1000)),
    ?line {ok, _} = dets:open_file(Tab, [{file,Fname},{version,Version}]),
    ?line ok = dets:from_ets(Tab, Ets),
    ?line ok = dets:sync(Tab),
    ?line ok = dets:close(Tab),
    ?line {ok, _} = dets:open_file(Tab, [{file,Fname},{access,read}]),
    ?line [{1,2}] = dets:lookup(Tab, 1),
    ?line ok = dets:close(Tab),
    ?line ets:delete(Ets),
    ?line file:delete(Fname).

otp_6206(doc) ->
    ["OTP-6206. Badly formed free lists."];
otp_6206(suite) ->
    [];
otp_6206(Config) ->
    Tab = otp_6206,
    File = filename(Tab, Config),

    file:delete(File),
    Options = [{file,File}],
    ?line {ok, Tab} = dets:open_file(Tab, Options),
    NObjs = 13006,
    ?line ok = ins(Tab, NObjs),
    ?line ok = del(Tab, NObjs, 2),
    ?line ok = dets:close(Tab),

    %% Used to return {badmatch,{error,{bad_freelists,File}}.
    ?line {ok, Tab} = dets:open_file(Tab, [{repair,false}|Options]),
    ?line ok = dets:close(Tab),
    file:delete(File),
    ok.

otp_6359(doc) ->
    ["OTP-6359. select and match never return the empty list."];
otp_6359(suite) ->
    [];
otp_6359(Config) ->
    Tab = otp_6359,
    File = filename(Tab, Config),

    file:delete(File),
    ?line {ok, _} = dets:open_file(Tab, [{file, File}]),
    %% Used to return {[], Cont}:
    ?line '$end_of_table' = dets:match(Tab, '_', 100),
    ?line ok = dets:close(Tab),
    file:delete(File),
    ok.

otp_4738(doc) ->
    ["OTP-4738. ==/2 and =:=/2."];
otp_4738(suite) ->
    [];
otp_4738(Config) ->
    %% Version 8 has not been corrected.
    %% (The constant -12857447 is for version 9 only.)
    otp_4738_set(9, Config),
    otp_4738_bag(9, Config),
    otp_4738_dupbag(9, Config),
    ok.

otp_4738_dupbag(Version, Config) ->
    Tab = otp_4738,
    File = filename(Tab, Config),
    file:delete(File),
    I = -12857447,
    F = float(I),
    One = 1,
    FOne = float(One),
    Args = [{file,File},{type,duplicate_bag},{version,Version}],
    ?line {ok, Tab} = dets:open_file(Tab, Args),
    ?line ok = dets:insert(Tab, [{I,One},{F,One},{I,FOne},{F,FOne}]),
    ?line ok = dets:sync(Tab),
    ?line [{F,One},{F,FOne}] = dets:lookup(Tab, F),
    ?line [{I,One},{I,FOne}] = dets:lookup(Tab, I),
    ?line ok = dets:insert(Tab, [{F,One},{F,FOne}]),
    ?line [{I,One},{I,FOne},{F,One},{F,FOne},{F,One},{F,FOne}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:insert(Tab, [{F,FOne},{F,One}]),
    ?line [{I,One},{I,FOne},{F,One},{F,FOne},{F,One},
           {F,FOne},{F,FOne},{F,One}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:delete_object(Tab, {I,FOne}),
    ?line [{I,One},{F,One},{F,FOne},{F,One},{F,FOne},{F,FOne},{F,One}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:insert(Tab, {I,FOne}),
    ?line [{I,One},{I,FOne},{F,One},{F,FOne},{F,One},
           {F,FOne},{F,FOne},{F,One}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:delete_object(Tab, {F,FOne}),
    ?line [{I,One},{I,FOne},{F,One},{F,One},{F,One}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:delete(Tab, F),
    ?line [{I,One},{I,FOne}] = dets:match_object(Tab, '_'),
    ?line ok = dets:close(Tab),
    file:delete(File),

    Zero = 0,
    FZero = float(Zero),
    ?line {ok, Tab} = dets:open_file(Tab, Args),    
    ?line ok = dets:insert(Tab, [{I,One},{F,One},{I,FOne},{F,FOne}]),
    ?line ok = dets:insert(Tab, [{I,One},{F,One},{I,FOne},{F,FOne}]),
    ?line ok = dets:insert(Tab, [{I,Zero},{F,Zero},{I,FZero},{I,FZero}]),
    ?line Objs0 = dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:close(Tab),
    crash(File, ?CLOSED_PROPERLY_POS+3, ?NOT_PROPERLY_CLOSED),
    io:format("Expect repair:~n"),
    ?line {ok, Tab} = dets:open_file(Tab, Args),    
    ?line Objs1 = dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:close(Tab),
    ?line Objs1 = Objs0,
    file:delete(File),
    ok.

otp_4738_bag(Version, Config) ->
    Tab = otp_4738,
    File = filename(Tab, Config),
    file:delete(File),
    I = -12857447,
    F = float(I),
    One = 1,
    FOne = float(One),
    Args = [{file,File},{type,bag},{version,Version}],
    ?line {ok, Tab} = dets:open_file(Tab, Args),
    ?line ok = dets:insert(Tab, [{I,One},{F,One},{I,FOne},{F,FOne}]),
    ?line ok = dets:sync(Tab),
    ?line [{F,One},{F,FOne}] = dets:lookup(Tab, F),
    ?line [{I,One},{I,FOne}] = dets:lookup(Tab, I),
    ?line ok = dets:insert(Tab, [{F,One},{F,FOne}]),
    ?line [{I,One},{I,FOne},{F,One},{F,FOne}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:insert(Tab, [{F,FOne},{F,One}]),
    ?line [{I,One},{I,FOne},{F,FOne},{F,One}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:delete_object(Tab, {I,FOne}),
    ?line [{I,One},{F,FOne},{F,One}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:insert(Tab, {I,FOne}),
    ?line [{I,One},{I,FOne},{F,FOne},{F,One}] = 
        dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:delete(Tab, F),
    ?line [{I,One},{I,FOne}] = dets:match_object(Tab, '_'),
    ?line ok = dets:close(Tab),
    file:delete(File).

otp_4738_set(Version, Config) ->
    Tab = otp_4738,
    File = filename(Tab, Config),
    file:delete(File),
    Args = [{file,File},{type,set},{version,Version}],

    %% I and F share the same slot.
    I = -12857447,
    F = float(I),
    ?line {ok, Tab} = dets:open_file(Tab, Args),
    ?line ok = dets:insert(Tab, [{I},{F}]),
    ?line ok = dets:sync(Tab),
    ?line [{F}] = dets:lookup(Tab, F),
    ?line [{I}] = dets:lookup(Tab, I),
    ?line ok = dets:insert(Tab, [{F}]),
    ?line [{I},{F}] = dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:close(Tab),
    file:delete(File),
    
    ?line {ok, Tab} = dets:open_file(Tab, Args),
    ?line ok = dets:insert(Tab, [{I}]),
    ?line ok = dets:sync(Tab),
    ?line [] = dets:lookup(Tab, F),
    ?line [{I}] = dets:lookup(Tab, I),
    ?line ok = dets:insert(Tab, [{F}]),
    ?line [{I},{F}] = dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:close(Tab),
    file:delete(File),

    ?line {ok, Tab} = dets:open_file(Tab, Args),
    ok = dets:insert(Tab, [{I},{F}]),
    %% {insert, ...} in the cache, try lookup:
    ?line [{F}] = dets:lookup(Tab, F),
    ?line [{I}] = dets:lookup(Tab, I),
    %% Both were found, but that cannot be verified.
    ?line [{I},{F}] = dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:close(Tab),
    file:delete(File),

    ?line {ok, Tab} = dets:open_file(Tab, Args),
    ?line ok = dets:insert(Tab, [{I}]),
    ?line ok = dets:sync(Tab),
    ?line ok = dets:insert(Tab, [{F}]),
    %% {insert, ...} in the cache, try lookup:
    ?line [{F}] = dets:lookup(Tab, F),
    ?line [{I}] = dets:lookup(Tab, I),
    ?line [{I},{F}] = dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:close(Tab),
    file:delete(File),

    ?line {ok, Tab} = dets:open_file(Tab, Args),
    %% Both operations in the cache:
    ?line ok = dets:insert(Tab, [{I}]),
    ?line ok = dets:insert(Tab, [{F}]),
    ?line [{I},{F}] = dets_utils:mkeysort(1, dets:match_object(Tab, '_')),
    ?line ok = dets:close(Tab),
    file:delete(File),
    ok.

otp_7146(doc) ->
    ["OTP-7146. Bugfix: missing test when re-hashing."];
otp_7146(suite) ->
    [];
otp_7146(Config) ->
    Tab = otp_7146,
    File = filename(Tab, Config),
    file:delete(File),

    Max = 2048,
    ?line {ok, Tab} = dets:open_file(Tab, [{max_no_slots,Max}, {file,File}]),
    write_dets(Tab, Max),
    ?line ok = dets:close(Tab),

    file:delete(File),
    ok.

write_dets(Tab, Max) ->
    write_dets(Tab, 0, Max).

write_dets(_Tab, N, Max) when N > Max ->
    ok;
write_dets(Tab, N, Max) ->
    ok = dets:insert(Tab,{ N, {entry,N}}),
    write_dets(Tab, N+1, Max).

otp_8070(doc) ->
    ["OTP-8070. Duplicated objects with insert_new() and duplicate_bag."];
otp_8070(suite) ->
    [];
otp_8070(Config) when is_list(Config) ->
    Tab = otp_8070,
    File = filename(Tab, Config),
    file:delete(File),
    ?line {ok, _} = dets:open_file(Tab, [{file,File},{type, duplicate_bag}]),
    ?line ok = dets:insert(Tab, [{3,0}]),
    ?line false = dets:insert_new(Tab, [{3,1},{3,1}]),
    ?line [{3,0}] = dets:lookup(Tab, 3),
    ?line ok = dets:close(Tab),
    file:delete(File),
    ok.

otp_8856(doc) ->
    ["OTP-8856. insert_new() bug."];
otp_8856(suite) ->
    [];
otp_8856(Config) when is_list(Config) ->
    Tab = otp_8856,
    File = filename(Tab, Config),
    file:delete(File),
    Me = self(),
    ?line {ok, _} = dets:open_file(Tab, [{type, bag}, {file, File}]),
    spawn(fun()-> Me ! {1, dets:insert(Tab, [])} end),
    spawn(fun()-> Me ! {2, dets:insert_new(Tab, [])} end),
    ?line ok = dets:close(Tab),
    ?line receive {1, ok} -> ok end,
    ?line receive {2, true} -> ok end,
    file:delete(File),

    ?line {ok, _} = dets:open_file(Tab, [{type, set}, {file, File}]),
    spawn(fun() -> dets:delete(Tab, 0) end),
    spawn(fun() -> Me ! {3, dets:insert_new(Tab, {0,0})} end),
    ?line ok = dets:close(Tab),
    ?line receive {3, true} -> ok end,
    file:delete(File),
    ok.

otp_8903(doc) ->
    ["OTP-8903. bchunk/match/select bug."];
otp_8903(suite) ->
    [];
otp_8903(Config) when is_list(Config) ->
    Tab = otp_8903,
    File = filename(Tab, Config),
    ?line {ok,T} = dets:open_file(bug, [{file,File}]),
    ?line ok = dets:insert(T, [{1,a},{2,b},{3,c}]),
    ?line dets:safe_fixtable(T, true),
    ?line {[_],C1} = dets:match_object(T, '_', 1),
    ?line {BC1,_D} = dets:bchunk(T, start),
    ?line ok = dets:close(T),
    ?line {'EXIT', {badarg, _}} = (catch {foo,dets:match_object(C1)}),
    ?line {'EXIT', {badarg, _}} = (catch {foo,dets:bchunk(T, BC1)}),
    ?line {ok,T} = dets:open_file(bug, [{file,File}]),
    ?line false = dets:info(T, safe_fixed),
    ?line {'EXIT', {badarg, _}} = (catch {foo,dets:match_object(C1)}),
    ?line {'EXIT', {badarg, _}} = (catch {foo,dets:bchunk(T, BC1)}),
    ?line ok = dets:close(T),
    file:delete(File),
    ok.

otp_8923(doc) ->
    ["OTP-8923. rehash due to lookup after initialization."];
otp_8923(suite) ->
    [];
otp_8923(Config) when is_list(Config) ->
    Tab = otp_8923,
    File = filename(Tab, Config),
    %% Create a file with more than 256 keys:
    file:delete(File),
    Bin = list_to_binary([ 0 || _ <- lists:seq(1, 400) ]),
    BigBin = list_to_binary([ 0 ||_ <- lists:seq(1, 4000)]),
    Ets = ets:new(temp, [{keypos,1}]),
    ?line [ true = ets:insert(Ets, {C,Bin}) || C <- lists:seq(1, 700) ],
    ?line true = ets:insert(Ets, {helper_data,BigBin}),
    ?line true = ets:insert(Ets, {prim_btree,BigBin}),
    ?line true = ets:insert(Ets, {sec_btree,BigBin}),
    %% Note: too few slots; re-hash will take place
    ?line {ok, Tab} = dets:open_file(Tab, [{file,File}]),
    ?line Tab = ets:to_dets(Ets, Tab),
    ?line ok = dets:close(Tab),
    ?line true = ets:delete(Ets),
    
    ?line {ok,Ref} = dets:open_file(File),
    ?line [{1,_}] = dets:lookup(Ref, 1),
    ?line ok = dets:close(Ref),

    ?line {ok,Ref2} = dets:open_file(File),
    ?line [{helper_data,_}] = dets:lookup(Ref2, helper_data),
    ?line ok = dets:close(Ref2),

    file:delete(File),
    ok.

otp_9282(doc) ->
    ["OTP-9282. The name of a table can be an arbitrary term"];
otp_9282(suite) ->
    [];
otp_9282(Config) when is_list(Config) ->
    some_calls(make_ref(), Config),
    some_calls({a,typical,name}, Config),
    some_calls(fun() -> a_funny_name end, Config),
    ok.

some_calls(Tab, Config) ->
    File = filename(ref, Config),
    ?line {ok,T} = dets:open_file(Tab, [{file,File}]),
    ?line T = Tab,
    ?line false = dets:info(T, safe_fixed),
    ?line File = dets:info(T, filename),
    ?line ok = dets:insert(Tab, [{3,0}]),
    ?line [{3,0}] = dets:lookup(Tab, 3),
    ?line [{3,0}] = dets:traverse(Tab, fun(X) -> {continue, X} end),
    ?line ok = dets:close(T),
    file:delete(File).

%%
%% Parts common to several test cases
%% 

crash(File, Where) ->
    crash(File, Where, 10).

crash(File, Where, What) when is_integer(What) ->
    ?line {ok, Fd} = file:open(File, [read,write]),
    ?line file:position(Fd, Where),
    ?line ok = file:write(Fd, [What]),
    ?line ok = file:close(Fd).

args(Config) ->
    {Sets, Bags, Dups} = 
	{[
	  [], 
	  [{type, set}, {estimated_no_objects, 300},  
	   {ram_file, true}],
	  [{type, set}, {estimated_no_objects, 300}],
	  [{type, set}, {estimated_no_objects, 300}],
	  [{auto_save,20}, {type, set}, 
	   {estimated_no_objects, 300}] 
	 ],

	 [
	  [{type, bag}, {estimated_no_objects, 300}, {ram_file, true}],
	  [{type, bag}],
	  [{type, bag}, {estimated_no_objects, 300}],
	  [{type, bag}, {estimated_no_objects, 300}],
	  [{type, bag}, 
	   {auto_save,20}, {estimated_no_objects, 300}],
	  [{type, bag}, {estimated_no_objects, 300},   {ram_file, true}]
	 ],

	 [
	  [{type, duplicate_bag}, {estimated_no_objects, 300}, 
	   {ram_file, true}],
	  [{type, duplicate_bag}],
	  [{type, duplicate_bag}, {estimated_no_objects, 300}],
	  [{type, duplicate_bag}, {estimated_no_objects, 300}],
	  [{type, duplicate_bag},
	   {auto_save,20}, {estimated_no_objects, 300}],
	  [{type, duplicate_bag}, {estimated_no_objects, 300},   
	   {ram_file, true}]
	 ]
	},
    zip_filename(Sets, Bags, Dups, Config).

zip_filename(S, B, D, Conf) ->
    zip_filename(S, B, D, [], [], [], 1, Conf).

zip_filename([H|T], B, D, S1, B1, D1, I, Conf) ->
    zip_filename(T, B, D, [[{file, new_filename(I, Conf)} | H] | S1],
		 B1, D1, I+1, Conf);
zip_filename([], [H|B], D, S1, B1, D1, I, Conf) ->
    zip_filename([], B, D, S1, [[{file, new_filename(I, Conf)} | H] | B1],
		 D1, I+1, Conf);
zip_filename([], [], [H|T], S1, B1, D1, I, Conf) ->
    zip_filename([], [], T, S1, B1, [[{file, new_filename(I, Conf)} | H] | D1],
		 I+1, Conf);
zip_filename([], [], [], S1, B1, D1, _, _Conf) ->
    {reverse(S1), reverse(B1), reverse(D1)}.

del_test(Tab) ->
    ?format("Deltest on ~p~n", [Tab]),
    ?line Objs = safe_get_all_objects(Tab),
    ?line Keys = map(fun(X) -> element(1, X) end, Objs),
    ?line foreach(fun(Key) -> dets:delete(Tab, Key) end, Keys),
    ?line 0 = length(get_all_objects(Tab)),
    ?line [] = get_all_objects_fast(Tab),
    ?line 0 = dets:info(Tab, size).

del_obj_test(Tab) ->
    ?format("Delobjtest on ~p~n", [Tab]),
    ?line Objs = safe_get_all_objects(Tab),
    ?line LL = length(Objs),
    ?line LL = dets:info(Tab, size),
    ?line foreach(fun(Obj) -> dets:delete_object(Tab, Obj) end, Objs),
    ?line 0 = length(get_all_objects(Tab)),
    ?line [] = get_all_objects_fast(Tab),
    ?line 0 = dets:info(Tab, size).

match_del_test(Tab) ->
    ?line ?format("Match delete test on ~p~n", [Tab]),
    ?line ok = dets:match_delete(Tab, {'_','_','_'}),
    ?line Sz = dets:info(Tab, size),
    ?line true = Sz =:= length(dets:match_object(Tab, '_')),
    ?line ok = dets:match_delete(Tab, '_'),
    ?line 0 = dets:info(Tab, size),
    ?line 0 = length(get_all_objects(Tab)),
    ?line [] = get_all_objects_fast(Tab).

trav_test(_Data, Len, Tab) ->
    ?format("Travtest on ~p~n", [Tab]),
    ?line _X0 = dets:traverse(Tab, fun(_X) -> continue end),
    ?line XX = dets:traverse(Tab, fun(X) -> {continue, X} end),
    ?line case Len =:= length(XX) of
	      false -> ?format("DIFF ~p~n", [XX -- _Data]);
	      true -> ok
	  end,
    ?line 1 = length(dets:traverse(Tab, fun(X) -> {done, X} end)).

match_test(Data, Tab) ->
    ?line ?format("Match test on ~p~n", [Tab]),
    ?line Data1 = sort(filter(fun(X) when tuple_size(X) =:= 3 -> true;
				 (_X) -> false
			      end, Data)),
    ?line Data1 = sort(dets:match_object(Tab, {'$1', '$2', '$3'})),

    ?line Len = length(Data),
    ?line Len = length(dets:match(Tab, '_')),
    ?line Len2 = length(Data1),
    ?line Len2 = length(dets:match(Tab, {'$1', '_', '_'})),
    
    ?line Data3 = 
	filter(fun(X) ->
		       K = element(1, X),
		       if
			   tuple_size(X) =:= 3, tuple_size(K) =:= 2 -> true;
			   true -> false
		       end
	       end, Data),
    ?line Len3 = length(Data3),
    ?line Len3 = length(dets:match(Tab, {{'$1', '$2'}, '_', '_'})),
    ?line Len3 = length(dets:match_object(Tab, {{'$1', '$2'}, '_', '_'})),
    
    ?line R = make_ref(),
    ?line dets:insert(Tab, {{R, R}, 33 ,44}),
    ?line 1 = length(dets:match(Tab, {{R, R}, '_', '_'})),
    ?line 1 = length(dets:match_object(Tab, {{R, R}, '_', '_'})).

%%
%% Utilities
%%

headsz(8) ->
    ?HEADSZ_v8;
headsz(_) ->
    ?HEADSZ_v9.

unwritable(Fname) ->
    ?line {ok, Info} = file:read_file_info(Fname),
    Mode = Info#file_info.mode - 8#00200,
    ?line file:write_file_info(Fname, Info#file_info{mode = Mode}).

writable(Fname) ->
    ?line {ok, Info} = file:read_file_info(Fname),
    Mode = Info#file_info.mode bor 8#00200,
    ?line file:write_file_info(Fname, Info#file_info{mode = Mode}).

truncate(File, Where) ->
    ?line {ok, Fd} = file:open(File, [read,write]),
    ?line file:position(Fd, Where),
    ?line ok = file:truncate(Fd),
    ?line ok = file:close(Fd).

new_filename(Name, _Config) when is_integer(Name) ->
    filename:join(?privdir(_Config),
		  integer_to_list(Name) ++ ".DETS").

filename(Name, Config) when is_atom(Name) ->
    filename(atom_to_list(Name), Config);
filename(Name, _Config) ->
    filename:join(?privdir(_Config), Name).

open_files(_Name, [], _Version) ->
    [];
open_files(Name0, [Args | Tail], Version) ->
    ?format("init ~p~n", [Args]),
    ?line Name = list_to_atom(integer_to_list(Name0)),
    ?line {ok, Name} = dets:open_file(Name, [{version,Version} | Args]),
    [Name | open_files(Name0+1, Tail, Version)].
    
close_all(Tabs) -> foreach(fun(Tab) -> ok = dets:close(Tab) end, Tabs).

delete_files(Args) ->   
    Fun = fun(F) ->
		  {value, {file, File}} = keysearch(file, 1, F),
		  file:delete(File),
		  File
	  end,
    map(Fun, Args).

%% Initialize all tables
initialize(Tabs, Data) ->
    ?line foreach(fun(Tab) ->
			  Fun = fun(Obj) -> ok =  dets:insert(Tab, Obj) end,
			  foreach(Fun, Data),
			  dets:sync(Tab)
		  end, Tabs).

%% need more than 512 objects to really trig overflow
make_data(Kp) ->
    make_data(Kp, set).

make_data(Kp, Type) ->
    dup(Type, make_data(Kp, Type, 520)).

dup(duplicate_bag, [H1, H2 |T]) ->
    [H1,H2, H1, H2 | dup(duplicate_bag, T)];
dup(_, Other) ->
    Other.
    
make_data(_Kp, Type, 0) -> 
    odd_keys(Type);
make_data(1, set, I) ->
    [{I, q,w} | make_data(1, set, I-1)];
make_data(2, set, I) ->
    [{hh, I, q,w} | make_data(2, set, I-1)];
make_data(1, bag, I) ->
    [{I, q,w} , {I, hah, 77} | make_data(1, bag, I-1)];
make_data(2, bag, I) ->
    [{hh, I, q,w} , {hh, I, lalal, 900} | make_data(2, bag, I-1)];
make_data(1, duplicate_bag, I) ->
    [{I, q,w} , {I, hah, 77} | make_data(1, duplicate_bag, I-1)];
make_data(2, duplicate_bag, I) ->
    [{hh, I, q,w} , {hh, I, lalal, 900} | make_data(2, duplicate_bag, I-1)].

odd_keys(_) ->
    [{foo, 1 ,2},
     {{foo, foo}, 2,3},
     {"kakaka", {{{}}}, jj},
     {{"kallll", "kkk", []}, 66.7777},
     {make_ref(), 99, 66},
     {{1},2,3,4,5,6,7,duplicate(50, 8)},
     {self(), 7,8,88},
     {[self()], 8, 11}].


ins(_T, 0) ->
    ok;
ins(T, N) ->
    case dets:insert(T, {N, item(N)}) of
	ok -> ins(T, N-1);
	Error -> Error
    end.

item(N) when N rem 2 =:= 0 ->
    {item, number, N};
item(N) ->
    {item, number, N, a, much, bigger, one, i, think}.

del(_T, N, _I) when N =< 0 ->
    ok;
del(T, N, I) ->
    ok = dets:delete(T, N),
    del(T, N-I, I).

ensure_node(0, _Node) ->
    could_not_start_node;
ensure_node(N, Node) ->
    case net_adm:ping(Node) of
	pang ->
	    receive after 1000 ->
			     ok
		    end,
	    ensure_node(N-1,Node);
	pong ->
	    ok
    end.

size_test(Len, Tabs) ->
    ?line foreach(fun(Tab) ->
			  Len = dets:info(Tab, size)
		  end, Tabs).

no_keys_test([T | Ts]) ->
    no_keys_test(T),
    no_keys_test(Ts);
no_keys_test([]) ->
    ok;
no_keys_test(T) ->
    case dets:info(T, version) of
	8 ->
	    ok;
	9 ->
	    Kp = dets:info(T, keypos),
	    ?line All = dets:match_object(T, '_'),
	    ?line L = lists:map(fun(X) -> element(Kp, X) end, All),
	    ?line NoKeys = length(lists:usort(L)),
	    ?line case {dets:info(T, no_keys), NoKeys} of
		      {N, N} ->
			  ok;
		      {N1, N2} ->
			  exit({no_keys_test, N1, N2})
		  end
    end.

safe_get_all_objects(Tab) ->
    dets:safe_fixtable(Tab, true),
    Objects = get_all_objects(Tab),
    dets:safe_fixtable(Tab, false),
    Objects.

%% Caution: unless the table has been fixed, strange results can be returned.
get_all_objects(Tab) -> get_all_objects(dets:first(Tab), Tab, []).

%% Assuming no key matches {error, Reason}...
get_all_objects('$end_of_table', _Tab, L) -> L;
get_all_objects({error, Reason}, _Tab, _L) ->
    exit({get_all_objects, get(line), {error, Reason}});
get_all_objects(Key, Tab, L) -> 
    Objs = dets:lookup(Tab, Key),
    ?line get_all_objects(dets:next(Tab, Key), Tab, Objs ++ L).

count_objects_quite_fast(Tab) ->
    ?line R1 = dets:match_object(Tab, '_', 1),
    count_objs_1(R1, 0).

count_objs_1('$end_of_table', N) ->
    N;
count_objs_1({Ts,C}, N) when is_list(Ts) ->
    count_objs_1(dets:match_object(C), length(Ts) + N).

get_all_objects_fast(Tab) ->
    dets:match_object(Tab, '_').

%% Relevant for version 8.
histogram(Tab) ->
    OnePercent = case dets:info(Tab, no_slots) of
	undefined -> undefined;
	{_, NoSlots, _} -> NoSlots/100
    end,
    histogram(Tab, OnePercent).

histogram(Tab, OnePercent) ->
    ?line E = ets:new(histo, []),
    ?line dets:safe_fixtable(Tab, true),
    ?line Hist = histo(Tab, E, 0, OnePercent, OnePercent),
    ?line dets:safe_fixtable(Tab, false),
    ?line case Hist of
	      ok ->
		  ?line H = ets:tab2list(E),
		  ?line true = ets:delete(E),
		  sort(H);
	      Error ->
		  ets:delete(E),
		  Error
	  end.

histo(T, E, I, One, Count) when is_number(Count), I > Count ->
    io:format("."),
    histo(T, E, I, One, Count+One);
histo(T, E, I, One, Count) ->
    ?line case dets:slot(T, I) of
	      '$end_of_table' when is_number(Count) ->
		  io:format("~n"),
		  ok;
	      '$end_of_table' ->
		  ok;
	       Objs when is_list(Objs) ->
		  L = length(Objs),
		  case catch ets:update_counter(E, L, 1) of
		      {'EXIT', _} ->
			  ets:insert(E, {L, 1});
		      _ ->
			  ok
		  end,
		  histo(T, E, I+1, One, Count);
	      Error ->
		  Error
	  end.

sum_histogram(H) ->
    sum_histogram(H, 0).

sum_histogram([{S,N1} | H], N) ->
    sum_histogram(H, N + S*N1);
sum_histogram([], N) ->
    N.

ave_histogram(H) ->
    ave_histogram(H, 0)/sum_histogram(H).

ave_histogram([{S,N1} | H], N) ->
    ave_histogram(H, N + S*S*N1);
ave_histogram([], N) ->
    N.

bad_object({error,{bad_object,FileName}}, FileName) ->
    ok; % Version 8, no debug.
bad_object({error,{{bad_object,_,_},FileName}}, FileName) ->
    ok; % Version 8, debug...
bad_object({error,{{bad_object,_}, FileName}}, FileName) ->
    ok; % No debug.
bad_object({error,{{{bad_object,_,_},_,_,_}, FileName}}, FileName) ->
    ok. % Debug.

check_pps(P0) ->
    case pps() of
        P0 ->
            ok;
        _ ->
            %% On some (rare) occasions the dets process is still
            %% running although the call to close() has returned, as
            %% it seems...
            timer:sleep(500),
            case pps() of
                P0 ->
                    ok;
                P1 -> 
                    io:format("failure, got ~p~n, expected ~p\n", [P1, P0]),
                    {Ports0,Procs0} = P0,
                    {Ports1,Procs1} = P1,
                    show("Old ports", Ports0 -- Ports1),
                    show("New ports", Ports1 -- Ports0),
                    show("Old procs", Procs0 -- Procs1),
                    show("New procs", Procs1 -- Procs0),
                    ?t:fail()
            end
    end.

show(_S, []) ->
    ok;
show(S, L) ->
    io:format("~s: ~p~n", [S, L]).

pps() ->
    dets:start(),
    {port_list(), process_list()}.

port_list() ->
    [{P,safe_second_element(erlang:port_info(P, name))} || 
        P <- erlang:ports()].

process_list() ->
    [{P,process_info(P, registered_name),
      safe_second_element(process_info(P, initial_call))} || 
        P <- processes()].

safe_second_element({_,Info}) -> Info;
safe_second_element(Other) -> Other.