aboutsummaryrefslogblamecommitdiffstats
path: root/erts/emulator/test/timer_bif_SUITE.erl
blob: b3f7cadc27bb8a391bd262144254fccd1d9aaec8 (plain) (tree)
1
2
3
4
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
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


                   
                                                        
















                                                                         
                                                                                                                                                              






                                                                         
                                                    
















                                                                          

                                                









                                                      





                         





                                     

























































































































































































































































































































































































































































































































                                                                                                             
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1998-2010. 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(timer_bif_SUITE).

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, init_per_group/2,end_per_group/2,init_per_testcase/2,fin_per_testcase/2,end_per_suite/1]).
-export([start_timer_1/1, send_after_1/1, send_after_2/1, send_after_3/1,
	 cancel_timer_1/1,
	 start_timer_big/1, send_after_big/1,
	 start_timer_e/1, send_after_e/1, cancel_timer_e/1,
	 read_timer_trivial/1, read_timer/1,
	 cleanup/1, evil_timers/1, registered_process/1]).

-include_lib("test_server/include/test_server.hrl").

init_per_testcase(_Case, Config) ->
    ?line Dog=test_server:timetrap(test_server:seconds(30)),
    case catch erts_debug:get_internal_state(available_internal_state) of
	true -> ok;
	_ -> erts_debug:set_internal_state(available_internal_state, true)
    end,
    [{watchdog, Dog}|Config].

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

end_per_suite(_Config) ->
    catch erts_debug:set_internal_state(available_internal_state, false).

suite() -> [{suite_callbacks,[ts_install_scb]}].

all() -> 
[start_timer_1, send_after_1, send_after_2,
 cancel_timer_1, start_timer_e, send_after_e,
 cancel_timer_e, start_timer_big, send_after_big,
 read_timer_trivial, read_timer, cleanup, evil_timers,
 registered_process].

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
	Config.

end_per_group(_GroupName, Config) ->
	Config.


start_timer_1(doc) -> ["Basic start_timer/3 functionality"];
start_timer_1(Config) when is_list(Config) ->
    ?line Ref1 = erlang:start_timer(1000, self(), plopp),
    ?line ok = get(1100, {timeout, Ref1, plopp}),

    ?line false = erlang:read_timer(Ref1),
    ?line false = erlang:cancel_timer(Ref1),
    ?line false = erlang:read_timer(Ref1),

    ?line Ref2 = erlang:start_timer(1000, self(), plapp),
    ?line Left2 = erlang:cancel_timer(Ref2),
    UpperLimit = case os:type() of
	vxworks ->
	    %% The ticks of vxworks have a far lesser granularity
	    %% than what is expected in this testcase, in
	    %% fact the Left2 variable can get a little more than 1000...
	    1100;
	_ ->
	    1000
    end,
    ?line RetVal = case os:type() of
	vxworks ->
		{comment, "VxWorks behaves slightly unexpected, should be fixed,"};
	_ ->
		ok
    end,
    ?line true = (Left2 > 900) and (Left2 =< UpperLimit),
    ?line empty = get_msg(),
    ?line false = erlang:cancel_timer(Ref2),

    ?line Ref3 = erlang:start_timer(1000, self(), plopp),
    ?line no_message = get(900, {timeout, Ref3, plopp}),

    RetVal.

send_after_1(doc) -> ["Basic send_after/3 functionality"];
send_after_1(Config) when is_list(Config) ->
    ?line Ref3 = erlang:send_after(1000, self(), plipp),
    ?line ok = get(1500, plipp),
    ?line false = erlang:read_timer(Ref3),
    ok.

start_timer_big(doc) -> ["Big timeouts for start_timer/3"];
start_timer_big(Config) when is_list(Config) ->
    ?line Big = 1 bsl 31,
    ?line R = erlang:start_timer(Big, self(), hej),
    ?line timer:sleep(200),
    ?line Left = erlang:cancel_timer(R),
    ?line case Big - Left of
	      Diff when Diff >= 200, Diff < 10000 ->
		  ok;
	      _Diff ->
		  test_server:fail({big, Big, Left})
	  end,
    ok.

send_after_big(doc) -> ["Big timeouts for send_after/3"];
send_after_big(Config) when is_list(Config) ->
    ?line Big = 1 bsl 31,
    ?line R = erlang:send_after(Big, self(), hej),
    ?line timer:sleep(200),
    ?line Left = erlang:cancel_timer(R),
    ?line case Big - Left of
	      Diff when Diff >= 200, Diff < 10000 ->
		  ok;
	      _Diff ->
		  test_server:fail({big, Big, Left})
	  end,
    ok.

send_after_2(doc) -> ["send_after/3: messages in the right order, kind version"];
send_after_2(Config) when is_list(Config) ->
    ?line _ = erlang:send_after(5000, self(), last),
    ?line _ = erlang:send_after(0, self(), a0),
    ?line _ = erlang:send_after(200, self(), a2),
    ?line _ = erlang:send_after(100, self(), a1),
    ?line _ = erlang:send_after(500, self(), a5),
    ?line _ = erlang:send_after(300, self(), a3),
    ?line _ = erlang:send_after(400, self(), a4),
    ?line [a0,a1,a2,a3,a4,a5,last] = collect(last),
    ok.

send_after_3(doc) -> ["send_after/3: messages in the right order, worse than send_after_2"];
send_after_3(Config) when is_list(Config) ->
    case os:type() of
	vxworks ->
	    {skipped, "VxWorks timer granularity and order is not working good, this is subject to change!"};
	_ ->
	    do_send_after_3()
    end.

do_send_after_3() ->
    ?line _ = erlang:send_after(100, self(), b1),
    ?line _ = erlang:send_after(101, self(), b2),
    ?line _ = erlang:send_after(102, self(), b3),
    ?line _ = erlang:send_after(103, self(), last),
    ?line [b1, b2, b3, last] = collect(last),

% This behaviour is not guaranteed:
%    ?line _ = erlang:send_after(100, self(), c1),
%    ?line _ = erlang:send_after(100, self(), c2),
%    ?line _ = erlang:send_after(100, self(), c3),
%    ?line _ = erlang:send_after(100, self(), last),
%    ?line [c1, c2, c3, last] = collect(last),

    ok.

cancel_timer_1(doc) -> ["Check trivial cancel_timer/1 behaviour"];
cancel_timer_1(Config) when is_list(Config) ->
    ?line false = erlang:cancel_timer(make_ref()),

    ok.

start_timer_e(doc) -> ["Error cases for start_timer/3"];
start_timer_e(Config) when is_list(Config) ->
    ?line {'EXIT', _} = (catch erlang:start_timer(-4, self(), hej)),
    ?line {'EXIT', _} = (catch erlang:start_timer(4728472847827482,
						  self(), hej)),

    ?line {'EXIT', _} = (catch erlang:start_timer(4.5, self(), hej)),
    ?line {'EXIT', _} = (catch erlang:start_timer(a, self(), hej)),

    ?line Node = start_slave(),
    ?line Pid = spawn(Node, timer, sleep, [10000]),
    ?line {'EXIT', _} = (catch erlang:start_timer(1000, Pid, hej)),
    ?line stop_slave(Node),


    ok.

send_after_e(doc) -> ["Error cases for send_after/3"];
send_after_e(suite) -> [];
send_after_e(Config) when is_list(Config) ->
    ?line {'EXIT', _} = (catch erlang:send_after(-4, self(), hej)),
    ?line {'EXIT', _} = (catch erlang:send_after(4728472847827482,
						 self(), hej)),

    ?line {'EXIT', _} = (catch erlang:send_after(4.5, self(), hej)),
    ?line {'EXIT', _} = (catch erlang:send_after(a, self(), hej)),

    ?line Node = start_slave(),
    ?line Pid = spawn(Node, timer, sleep, [10000]),
    ?line {'EXIT', _} = (catch erlang:send_after(1000, Pid, hej)),
    ?line stop_slave(Node),
    ok.

cancel_timer_e(doc) -> ["Error cases for cancel_timer/1"];
cancel_timer_e(suite) -> [];
cancel_timer_e(Config) when is_list(Config) ->
    ?line {'EXIT', _} = (catch erlang:cancel_timer(1)),
    ?line {'EXIT', _} = (catch erlang:cancel_timer(self())),
    ?line {'EXIT', _} = (catch erlang:cancel_timer(a)),
    ok.

read_timer_trivial(doc) -> ["Trivial and error test cases for read_timer/1."];
read_timer_trivial(suite) -> [];
read_timer_trivial(Config) when is_list(Config) ->
    ?line false = erlang:read_timer(make_ref()),
    ?line {'EXIT', _} = (catch erlang:read_timer(42)),
    ?line {'EXIT', _} = (catch erlang:read_timer(423497834744444444457667444444)),
    ?line {'EXIT', _} = (catch erlang:read_timer(self())),
    ?line {'EXIT', _} = (catch erlang:read_timer(ab)),
    ok.

read_timer(doc) -> ["Test that read_timer/1 seems to return the correct values."];
read_timer(suite) -> [];
read_timer(Config) when is_list(Config) ->
    ?line Big = 1 bsl 31,
    ?line R = erlang:send_after(Big, self(), hej_hopp),

    ?line receive after 200 -> ok end,		% Delay and clear reductions.
    ?line Left = erlang:read_timer(R),
    ?line Left = erlang:cancel_timer(R),
    ?line false = erlang:read_timer(R),

    ?line case Big - Left of
	      Diff when Diff >= 200, Diff < 10000 ->
		  ok;
	      _Diff ->
		  test_server:fail({big, Big, Left})
	  end,
    ok.

cleanup(doc) -> [];
cleanup(suite) -> [];
cleanup(Config) when is_list(Config) ->
    ?line Mem = mem(),
    %% Timer on dead process
    ?line P1 = spawn(fun () -> ok end),
    ?line wait_until(fun () -> process_is_cleaned_up(P1) end),
    ?line T1 = erlang:start_timer(10000, P1, "hej"),
    ?line T2 = erlang:send_after(10000, P1, "hej"),
    ?line Mem = mem(),
    ?line false = erlang:read_timer(T1),
    ?line false = erlang:read_timer(T2),
    ?line Mem = mem(),
    %% Process dies before timeout
    ?line P2 = spawn(fun () -> receive after 500 -> ok end end),
    ?line T3 = erlang:start_timer(10000, P2, "hej"),
    ?line T4 = erlang:send_after(10000, P2, "hej"),
    ?line true = Mem < mem(),
    ?line true = is_integer(erlang:read_timer(T3)),
    ?line true = is_integer(erlang:read_timer(T4)),
    ?line wait_until(fun () -> process_is_cleaned_up(P2) end),
    ?line false = erlang:read_timer(T3),
    ?line false = erlang:read_timer(T4),
    ?line Mem = mem(),
    %% Cancel timer
    ?line P3 = spawn(fun () -> receive after 20000 -> ok end end),
    ?line T5 = erlang:start_timer(10000, P3, "hej"),
    ?line T6 = erlang:send_after(10000, P3, "hej"),
    ?line true = Mem < mem(),
    ?line true = is_integer(erlang:cancel_timer(T5)),
    ?line true = is_integer(erlang:cancel_timer(T6)),
    ?line false = erlang:read_timer(T5),
    ?line false = erlang:read_timer(T6),
    ?line exit(P3, kill),
    ?line Mem = mem(),
    %% Timeout
    ?line Ref = make_ref(),
    ?line T7 = erlang:start_timer(500, self(), Ref),
    ?line T8 = erlang:send_after(500, self(), Ref),
    ?line true = Mem < mem(),
    ?line true = is_integer(erlang:read_timer(T7)),
    ?line true = is_integer(erlang:read_timer(T8)),
    ?line receive {timeout, T7, Ref} -> ok end,
    ?line receive Ref -> ok end,
    ?line Mem = mem(),
    ?line ok.


evil_timers(doc) -> [];
evil_timers(suite) -> [];
evil_timers(Config) when is_list(Config) ->
    %% Create a composite term consisting of at least:
    %% * externals (remote pids, ports, and refs)
    %% * large (off heap) binaries
    %% * small (heap) binaries
    %% * funs
    %% * bignums
    %% * tuples
    %% * lists
    %% since data of these types have to be adjusted if moved
    %% in memory
    ?line Self = self(),
    ?line R1 = make_ref(),
    ?line Node = start_slave(),
    ?line spawn_link(Node,
		     fun () ->
			     Self ! {R1,
				     [lists:sublist(erlang:ports(), 3),
				      [make_ref(), make_ref(), make_ref()],
				      lists:sublist(processes(), 3),
				      [fun () -> gurka end,
				       fun (A) -> A + 1 end,
				       fun (A, B) -> A + B end]]}
		     end),
    ?line ExtList = receive {R1, L} -> L end,
    ?line stop_slave(Node),
    ?line BinList = [<<"bla">>,
		     <<"blipp">>,
		     <<"blupp">>,
		     list_to_binary(lists:duplicate(1000000,$a)),
		     list_to_binary(lists:duplicate(1000000,$b)),
		     list_to_binary(lists:duplicate(1000000,$c))],
    ?line FunList = [fun () -> gurka end,
		     fun (A) -> A + 1 end,
		     fun (A, B) -> A + B end],
    ?line PidList = lists:sublist(processes(), 3),
    ?line PortList = lists:sublist(erlang:ports(), 3),
    ?line RefList = [make_ref(), make_ref(), make_ref()],
    ?line BigList = [111111111111, 22222222222222, 333333333333333333],
    ?line Msg = {BinList,[FunList,{RefList,ExtList,PidList,PortList,BigList}]},
    %% ?line ?t:format("Msg=~p~n",[Msg]),

    ?line Prio = process_flag(priority, max),
    %%
    %% In the smp case there are four major cases we want to test:
    %%
    %% 1. A timer started with erlang:start_timer(Time, Receiver, Msg),
    %%    where Msg is a composite term, expires, and the receivers main
    %%    lock *can not* be acquired immediately (typically when the
    %%    receiver *is* running).
    %%
    %%    The wrap tuple ({timeout, TRef, Msg}) will in this case
    %%    be allocated in the previously allocated message buffer along
    %%    with Msg, i.e. the previously allocated message buffer will be
    %%    reallocated and potentially moved.
    ?line TimeOutMsgs0 = evil_setup_timers(200, Self, Msg),
    ?line RecvTimeOutMsgs0 = evil_recv_timeouts(200),
    %% 2. A timer started with erlang:start_timer(Time, Receiver, Msg),
    %%    where Msg is an immediate term, expires, and the receivers main
    %%    lock *can not* be acquired immediately (typically when the
    %%    receiver *is* running).
    %%
    %%    The wrap tuple will in this case be allocated in a new
    %%    message buffer.
    ?line TimeOutMsgs1 = evil_setup_timers(200, Self, immediate),
    ?line RecvTimeOutMsgs1 = evil_recv_timeouts(200),
    %% 3. A timer started with erlang:start_timer(Time, Receiver, Msg),
    %%    where Msg is a composite term, expires, and the receivers main
    %%    lock *can* be acquired immediately (typically when the receiver
    %%    *is not* running).
    %%
    %%    The wrap tuple will in this case be allocated on the receivers
    %%    heap, and Msg is passed in the previously allocated message
    %%    buffer.
    ?line R2 = make_ref(),
    ?line spawn_link(fun () ->
			     Self ! {R2, evil_setup_timers(200, Self, Msg)}
		     end),
    ?line receive after 1000 -> ok end,
    ?line TimeOutMsgs2 = receive {R2, TOM2} -> TOM2 end,
    ?line RecvTimeOutMsgs2 = evil_recv_timeouts(200),
    %% 4. A timer started with erlang:start_timer(Time, Receiver, Msg),
    %%    where Msg is an immediate term, expires, and the Receivers main
    %%    lock *can* be acquired immediately (typically when the receiver
    %%    *is not* running).
    %%
    %%    The wrap tuple will in this case be allocated on the receivers
    %%    heap.
    ?line R3 = make_ref(),
    ?line spawn_link(fun () ->
			     Self ! {R3, evil_setup_timers(200,Self,immediate)}
		     end),
    ?line receive after 1000 -> ok end,
    ?line TimeOutMsgs3 = receive {R3, TOM3} -> TOM3 end,
    ?line RecvTimeOutMsgs3 = evil_recv_timeouts(200),

    %% Garge collection will hopefully crash the emulator if something
    %% is wrong...
    ?line garbage_collect(),
    ?line garbage_collect(),
    ?line garbage_collect(),

    %% Make sure we got the timeouts we expected
    %%
    %% Note timeouts are *not* guaranteed to be delivered in order
    ?line ok = match(lists:sort(RecvTimeOutMsgs0), lists:sort(TimeOutMsgs0)),
    ?line ok = match(lists:sort(RecvTimeOutMsgs1), lists:sort(TimeOutMsgs1)),
    ?line ok = match(lists:sort(RecvTimeOutMsgs2), lists:sort(TimeOutMsgs2)),
    ?line ok = match(lists:sort(RecvTimeOutMsgs3), lists:sort(TimeOutMsgs3)),

    ?line process_flag(priority, Prio),
    ?line ok.

evil_setup_timers(N, Receiver, Msg) ->
    ?line evil_setup_timers(0, N, Receiver, Msg, []).

evil_setup_timers(N, N, _Receiver, _Msg, TOs) ->
    ?line TOs;
evil_setup_timers(N, Max, Receiver, Msg, TOs) ->
    ?line TRef = erlang:start_timer(N, Receiver, Msg),
    ?line evil_setup_timers(N+1, Max, Receiver, Msg, [{timeout,TRef,Msg}|TOs]).


evil_recv_timeouts(M) ->
    ?line evil_recv_timeouts([], 0, M).

evil_recv_timeouts(TOs, N, N) ->
    ?line TOs;
evil_recv_timeouts(TOs, N, M) ->
    ?line receive
	      {timeout, _, _} = TO ->
		  ?line evil_recv_timeouts([TO|TOs], N+1, M)
	  after 0 ->
		  ?line evil_recv_timeouts(TOs, N, M)
	  end.

registered_process(doc) -> [];
registered_process(suite) -> [];
registered_process(Config) when is_list(Config) ->
    ?line Mem = mem(),
    %% Cancel
    ?line T1 = erlang:start_timer(500, ?MODULE, "hej"),
    ?line T2 = erlang:send_after(500, ?MODULE, "hej"),
    ?line undefined = whereis(?MODULE),
    ?line true = Mem < mem(),
    ?line true = is_integer(erlang:cancel_timer(T1)),
    ?line true = is_integer(erlang:cancel_timer(T2)),
    ?line false = erlang:read_timer(T1),
    ?line false = erlang:read_timer(T2),
    ?line Mem = mem(),
    %% Timeout register after start
    ?line Ref1 = make_ref(),
    ?line T3 = erlang:start_timer(500, ?MODULE, Ref1),
    ?line T4 = erlang:send_after(500, ?MODULE, Ref1),
    ?line undefined = whereis(?MODULE),
    ?line true = Mem < mem(),
    ?line true = is_integer(erlang:read_timer(T3)),
    ?line true = is_integer(erlang:read_timer(T4)),
    ?line true = register(?MODULE, self()),
    ?line receive {timeout, T3, Ref1} -> ok end,
    ?line receive Ref1 -> ok end,
    ?line Mem = mem(),
    %% Timeout register before start
    ?line Ref2 = make_ref(),
    ?line T5 = erlang:start_timer(500, ?MODULE, Ref2),
    ?line T6 = erlang:send_after(500, ?MODULE, Ref2),
    ?line true = Mem < mem(),
    ?line true = is_integer(erlang:read_timer(T5)),
    ?line true = is_integer(erlang:read_timer(T6)),
    ?line receive {timeout, T5, Ref2} -> ok end,
    ?line receive Ref2 -> ok end,
    ?line Mem = mem(),
    ?line true = unregister(?MODULE),
    ?line ok.

mem() ->
    AA = erlang:system_info(allocated_areas),
    {value,{bif_timer,Mem}} = lists:keysearch(bif_timer, 1, AA),
    Mem.

process_is_cleaned_up(P) when is_pid(P) ->
    undefined == erts_debug:get_internal_state({process_status, P}).

wait_until(Pred) when is_function(Pred) ->
    case catch Pred() of
	true -> ok;
	_ -> receive after 50 -> ok end, wait_until(Pred)
    end.

get(Time, Msg) ->
    receive 
	Msg ->
	    ok
    after Time
	  ->
	    no_message
    end.

get_msg() ->
    receive
	Msg ->
	    {ok, Msg}
    after 0 ->
	    empty
    end.

start_slave() ->
    ?line {A, B, C} = now(),
    ?line Pa = filename:dirname(code:which(?MODULE)),
    ?line Name = atom_to_list(?MODULE) ++ "-" ++ integer_to_list(A+B+C),
    {ok, Node} = ?t:start_node(Name, slave, [{args, "-pa " ++ Pa}]),
    Node.

stop_slave(Node) ->
    test_server:stop_node(Node).

collect(Last) ->
    collect(Last, []).

receive_one() ->
    receive
	Msg ->
	    Msg
    end.

collect(Last, Msgs0) ->
    Msg = receive_one(),
    Msgs = Msgs0 ++ [Msg],
    case Msg of
	Last ->
	    Msgs;
	_ ->
	    collect(Last, Msgs)
    end.

match(X, X) ->
    %erlang:display({match, X}),
    ok;
match(X, Y) ->
    %erlang:display({mismatch, X, Y}),
    match_aux(X, Y).

match_aux(X, X) ->
    unexpected_error;
match_aux(X, Y) when is_list(X), is_list(Y), length(X) =/= length(Y) ->
    %% erlang:display({mismatch, X, Y}),
    {list_length_mismatch, length(X), length(Y)};
match_aux([X|Xs], [X|Ys]) ->
    match_aux(Xs, Ys);
match_aux([X|_], [Y|_]) ->
    match_aux(X, Y);
match_aux(X, Y) when is_tuple(X), is_tuple(Y), size(X) =/= size(Y) ->
    %% erlang:display({mismatch, X, Y}),
    {tuple_size_mismatch, size(X), size(Y)};
match_aux(X, Y) when is_tuple(X), is_tuple(Y) ->
    match_aux(tuple_to_list(X), tuple_to_list(Y));
match_aux(X, Y) ->
    %% erlang:display({mismatch, X, Y}),
    {mismatch, type(X), type(Y)}.

type(X) when is_list(X) -> list;
type(X) when is_tuple(X) -> tuple;
type(X) when is_float(X) -> float;
type(X) when is_integer(X) -> integer;
type(X) when is_pid(X) -> {pid, node(X)};
type(X) when is_reference(X) -> {reference, node(X)};
type(X) when is_port(X) -> {port, node(X)};
type(X) when is_binary(X) -> binary;
type(X) when is_atom(X) -> atom;
type(_) -> unknown.