aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/beam/erl_lock_count.c
blob: 6211983f4b380ee10586496b358eb1a99b742324 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
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
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
/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 2008-2009. 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%
 */

/*
 * Description:	Statistics for locks.
 *
 * Author:	Bj�rn-Egil Dahlberg
 * Date:	2008-07-03
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

/* Needed for VxWorks va_arg */
#include "sys.h"

#ifdef ERTS_ENABLE_LOCK_COUNT

#include "erl_lock_count.h"
#include "ethread.h"
#include "erl_term.h"
#include "atom.h"
#include <stdio.h>

/* globals, dont access these without locks or blocks */

ethr_mutex lcnt_data_lock;
erts_lcnt_data_t *erts_lcnt_data;
Uint16 erts_lcnt_rt_options;
erts_lcnt_time_t timer_start;
const char *str_undefined = "undefined";

static ethr_tsd_key lcnt_thr_data_key;
static int lcnt_n_thr;
static erts_lcnt_thread_data_t *lcnt_thread_data[1024]; 

/* local functions */

static ERTS_INLINE void lcnt_lock(void) {
    ethr_mutex_lock(&lcnt_data_lock); 
}

static ERTS_INLINE void lcnt_unlock(void) {
    ethr_mutex_unlock(&lcnt_data_lock); 
}


static char* lcnt_lock_type(Uint16 flag) {
    switch(flag & ERTS_LCNT_LT_ALL) {
    case ERTS_LCNT_LT_SPINLOCK:	  return "spinlock";
    case ERTS_LCNT_LT_RWSPINLOCK: return "rw_spinlock";
    case ERTS_LCNT_LT_MUTEX:      return "mutex";
    case ERTS_LCNT_LT_RWMUTEX:	  return "rw_mutex";
    case ERTS_LCNT_LT_PROCLOCK:	  return "proclock";
    default:                      return "";
    }
}

static void lcnt_clear_stats(erts_lcnt_lock_stats_t *stats) {
    ethr_atomic_set(&stats->tries, 0);
    ethr_atomic_set(&stats->colls, 0);
    stats->timer.s  = 0;
    stats->timer.ns = 0;
    stats->timer_n  = 0;
    stats->file     = (char *)str_undefined;
    stats->line     = 0;
}

static void lcnt_time(erts_lcnt_time_t *time) {
#ifdef HAVE_GETHRTIME
    SysHrTime hr_time;
    hr_time  = sys_gethrtime();
    time->s  = (unsigned long)(hr_time / 1000000000LL);
    time->ns = (unsigned long)(hr_time - 1000000000LL*time->s);
#else    
    SysTimeval tv;
    sys_gettimeofday(&tv);
    time->s  = tv.tv_sec;
    time->ns = tv.tv_usec*1000LL;
#endif
}

static void lcnt_time_diff(erts_lcnt_time_t *d, erts_lcnt_time_t *t1, erts_lcnt_time_t *t0) {
    long ds;
    long dns;
    
    ds  = t1->s  - t0->s;
    dns = t1->ns - t0->ns;
	
    /* the difference should not be able to get bigger than 1 sec in ns*/
    
    if (dns < 0) {
	ds  -= 1;
	dns += 1000000000LL;
    }

    d->s  = ds;
    d->ns = dns;
}

/* difference d must be positive */

static void lcnt_time_add(erts_lcnt_time_t *t, erts_lcnt_time_t *d) {
    unsigned long ngns = 0;
    
    t->s  += d->s;
    t->ns += d->ns;

    ngns   = t->ns / 1000000000LL;
    t->ns  = t->ns % 1000000000LL;
    
    t->s  += ngns;
}

static erts_lcnt_thread_data_t *lcnt_thread_data_alloc(void) {
    erts_lcnt_thread_data_t *eltd;
   
    eltd = (erts_lcnt_thread_data_t*)malloc(sizeof(erts_lcnt_thread_data_t));
    eltd->timer_set = 0;
    eltd->lock_in_conflict = 0;

    eltd->id = lcnt_n_thr++;
    /* set thread data to array */
    lcnt_thread_data[eltd->id] = eltd;

    return eltd;
} 

static erts_lcnt_thread_data_t *lcnt_get_thread_data(void) {
    return (erts_lcnt_thread_data_t *)ethr_tsd_get(lcnt_thr_data_key);
}


/* debug */

#if 0
static char* lock_opt(Uint16 flag) {
    if ((flag & ERTS_LCNT_LO_WRITE) && (flag & ERTS_LCNT_LO_READ)) return "rw";
    if  (flag & ERTS_LCNT_LO_READ )                                return "r ";
    if  (flag & ERTS_LCNT_LO_WRITE)                                return " w";
    return "--";
}

static void print_lock_x(erts_lcnt_lock_t *lock, Uint16 flag, char *action, char *extra) {
    long int colls, tries, w_state, r_state;
    erts_lcnt_lock_stats_t *stats = NULL;
    
    float rate;
    char *type;
    int i;
    
    type = lcnt_lock_type(lock->flag);
    ethr_atomic_read(&lock->r_state, &r_state);
    ethr_atomic_read(&lock->w_state, &w_state);

    if (tries > 0) rate = (float)(colls/(float)tries)*100;
    else rate = 0.0f;
    
    if (lock->flag & flag) {
        erts_printf("%20s [%30s] [r/w state %4ld/%4ld] id %T %s\r\n", 
		action, 
		lock->name, 
		r_state, 
		w_state, 
		lock->id, 
		extra);
	
	for(i = 0; i < lock->n_stats; i++) {
	    stats = &(lock->stats[i]);
    	    ethr_atomic_read(&stats->tries, &tries);
    	    ethr_atomic_read(&stats->colls, &colls);
	    fprintf(stderr, "%69s:%5d [tries %9ld] [colls %9ld] [timer_n %8ld] [timer %4ld s %6ld us]\r\n",
		    stats->file,
		    stats->line,
		    tries,
		    colls,
		    stats->timer_n,
		    stats->timer.s,
		    (unsigned long)stats->timer.ns/1000);
	}
	fprintf(stderr, "\r\n");
    }
}

static void print_lock(erts_lcnt_lock_t *lock, char *action) {
    print_lock_x(lock, ERTS_LCNT_LT_ALL, action, "");
}

#endif

static erts_lcnt_lock_stats_t *lcnt_get_lock_stats(erts_lcnt_lock_t *lock, char *file, unsigned int line) {
    unsigned int i;
    erts_lcnt_lock_stats_t *stats = NULL;
    
    for (i = 0; i < lock->n_stats; i++) {
	if ((lock->stats[i].file == file) && (lock->stats[i].line == line)) {
	    return &(lock->stats[i]);
	}
    }
    if (lock->n_stats < ERTS_LCNT_MAX_LOCK_LOCATIONS) {
	stats = &lock->stats[lock->n_stats];
	lock->n_stats++;

	stats->file = file;
	stats->line = line;
	return stats;
    }
    return &lock->stats[0];

}

static void lcnt_update_stats(erts_lcnt_lock_stats_t *stats, int lock_in_conflict, erts_lcnt_time_t *time_wait) {
    
    ethr_atomic_inc(&stats->tries);

    /* beware of trylock */
    if (lock_in_conflict) ethr_atomic_inc(&stats->colls);

    if (time_wait) {
	lcnt_time_add(&(stats->timer), time_wait);
	stats->timer_n++;
    }
}

/* 
 * interface 
 */

void erts_lcnt_init() {
    erts_lcnt_thread_data_t *eltd = NULL;
    
    /* init lock */
    if (ethr_mutex_init(&lcnt_data_lock) != 0) abort();

    /* init tsd */    
    lcnt_n_thr = 0;

    ethr_tsd_key_create(&lcnt_thr_data_key);

    lcnt_lock();

    erts_lcnt_rt_options = ERTS_LCNT_OPT_PROCLOCK;
    
    eltd = lcnt_thread_data_alloc();

    ethr_tsd_set(lcnt_thr_data_key, eltd);
    
    /* init lcnt structure */
    erts_lcnt_data = (erts_lcnt_data_t*)malloc(sizeof(erts_lcnt_data_t));
    erts_lcnt_data->current_locks = erts_lcnt_list_init();
    erts_lcnt_data->deleted_locks = erts_lcnt_list_init();

    lcnt_unlock();

    /* set start timer and zero statistics */
    erts_lcnt_clear_counters();
}

/* list operations */

/* BEGIN ASSUMPTION: lcnt_data_lock taken */

erts_lcnt_lock_list_t *erts_lcnt_list_init(void) {
    erts_lcnt_lock_list_t *list;
    
    list = (erts_lcnt_lock_list_t*)malloc(sizeof(erts_lcnt_lock_list_t));
    list->head = NULL;
    list->tail = NULL;
    list->n    = 0;
    return list;
}

/* only do this on the list with the deleted locks! */
void erts_lcnt_list_clear(erts_lcnt_lock_list_t *list) {
    erts_lcnt_lock_t *lock = NULL,
		     *next = NULL;

    lock = list->head;
    
    while(lock != NULL) {
	next = lock->next;
	free(lock);
	lock = next;
    }

    list->head = NULL;
    list->tail = NULL;
    list->n    = 0;
}

void erts_lcnt_list_insert(erts_lcnt_lock_list_t *list, erts_lcnt_lock_t *lock) {
    erts_lcnt_lock_t *tail = NULL;

    tail = list->tail;
    if (tail) {
	tail->next = lock;
	lock->prev = tail;
    } else {
	list->head = lock;
	lock->prev = NULL;
	ASSERT(!lock->next);
    }
    lock->next = NULL;
    list->tail = lock;
    
    list->n++;
}

void erts_lcnt_list_delete(erts_lcnt_lock_list_t *list, erts_lcnt_lock_t *lock) {
    
    if (lock->next) lock->next->prev = lock->prev;
    if (lock->prev) lock->prev->next = lock->next;
    if (list->head == lock) list->head = lock->next;
    if (list->tail == lock) list->tail = lock->prev;
    
    lock->prev = NULL;
    lock->next = NULL;
    list->n--;
}
/* END ASSUMPTION: lcnt_data_lock taken */


/* lock operations */

/* interface to erl_threads.h */
/* only lock on init and destroy, all others should use atomics */
void erts_lcnt_init_lock(erts_lcnt_lock_t *lock, char *name, Uint16 flag ) { 
    erts_lcnt_init_lock_x(lock, name, flag, am_undefined);
}
void erts_lcnt_init_lock_x(erts_lcnt_lock_t *lock, char *name, Uint16 flag, Eterm id) { 
    int i;
    lcnt_lock();
    
    lock->next = NULL;
    lock->prev = NULL;
    lock->flag = flag;
    lock->name = name;
    lock->id   = id;

    ethr_atomic_init(&lock->r_state, 0);
    ethr_atomic_init(&lock->w_state, 0);
    
#ifdef DEBUG
    ethr_atomic_init(&lock->flowstate, 0);
#endif
    
    lock->n_stats = 1;

    for (i = 0; i < ERTS_LCNT_MAX_LOCK_LOCATIONS; i++) {
	lcnt_clear_stats(&lock->stats[i]);
    }
    erts_lcnt_list_insert(erts_lcnt_data->current_locks, lock);
    
    lcnt_unlock();
}

void erts_lcnt_destroy_lock(erts_lcnt_lock_t *lock) {
    erts_lcnt_lock_t *deleted_lock;
    
    /* copy structure and insert the copy */
    deleted_lock = (erts_lcnt_lock_t*)malloc(sizeof(erts_lcnt_lock_t));

    lcnt_lock();

    memcpy(deleted_lock, lock, sizeof(erts_lcnt_lock_t));
    deleted_lock->next = NULL;
    deleted_lock->prev = NULL;

    erts_lcnt_list_insert(erts_lcnt_data->deleted_locks, deleted_lock);

    /* delete original */
    erts_lcnt_list_delete(erts_lcnt_data->current_locks, lock);
    
    lcnt_unlock();
}

/* lock */

void erts_lcnt_lock_opt(erts_lcnt_lock_t *lock, Uint16 option) {
    long r_state = 0, w_state = 0;
    erts_lcnt_thread_data_t *eltd;
    
    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;

    eltd = lcnt_get_thread_data();

    ASSERT(eltd);
    
    ethr_atomic_read(&lock->w_state, &w_state);
    
    if (option & ERTS_LCNT_LO_WRITE) {
        ethr_atomic_read(&lock->r_state, &r_state);
        ethr_atomic_inc( &lock->w_state);
    }
    if (option & ERTS_LCNT_LO_READ) {
        ethr_atomic_inc( &lock->r_state);
    }
    
    /* we cannot acquire w_lock if either w or r are taken */
    /* we cannot acquire r_lock if w_lock is taken */	
    
    if ((w_state > 0) || (r_state > 0)){
	eltd->lock_in_conflict = 1;
	if (eltd->timer_set == 0) lcnt_time(&eltd->timer);
	eltd->timer_set++;
    } else {
	eltd->lock_in_conflict = 0;
    }
}

void erts_lcnt_lock(erts_lcnt_lock_t *lock) {
    long w_state;
    erts_lcnt_thread_data_t *eltd;
    
    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;

    ethr_atomic_read(&lock->w_state, &w_state);
    ethr_atomic_inc( &lock->w_state);

    eltd = lcnt_get_thread_data();

    ASSERT(eltd);

    if (w_state > 0) {
	eltd->lock_in_conflict = 1;
	/* only set the timer if nobody else has it
	 * This should only happen when proc_locks aquires several locks
	 * 'atomicly'. All other locks will block the thread if w_state > 0
	 * i.e. locked.
	 */
	if (eltd->timer_set == 0) lcnt_time(&eltd->timer);
	eltd->timer_set++;

    } else {
	eltd->lock_in_conflict = 0;
    }
}

/* if a lock wasn't really a lock operation, bad bad process locks */

void erts_lcnt_lock_unaquire(erts_lcnt_lock_t *lock) {
    /* should check if this thread was "waiting" */
    
    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;

    ethr_atomic_dec( &lock->w_state);
}

/* erts_lcnt_lock_post
 * used when we get a lock (i.e. directly after a lock operation)
 * if the timer was set then we had to wait for the lock
 * lock_post will calculate the wait time.
 */
void erts_lcnt_lock_post(erts_lcnt_lock_t *lock) {
    erts_lcnt_lock_post_x(lock, (char*)str_undefined, 0);
}

void erts_lcnt_lock_post_x(erts_lcnt_lock_t *lock, char *file, unsigned int line) {
    erts_lcnt_thread_data_t *eltd;
    erts_lcnt_time_t timer;
    erts_lcnt_time_t time_wait;
    erts_lcnt_lock_stats_t *stats;
#ifdef DEBUG
    long flowstate;
#endif

    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;
    
#ifdef DEBUG
    if (!(lock->flag & (ERTS_LCNT_LT_RWMUTEX | ERTS_LCNT_LT_RWSPINLOCK))) {
    	ethr_atomic_read(&lock->flowstate, &flowstate);
	ASSERT(flowstate == 0);
    	ethr_atomic_inc( &lock->flowstate);
    }
#endif
    
    eltd = lcnt_get_thread_data();
    
    ASSERT(eltd);
    
    /* if lock was in conflict, time it */
	
    stats = lcnt_get_lock_stats(lock, file, line);
    
    if (eltd->timer_set) {
	lcnt_time(&timer);

	eltd->timer_set--;
	
	lcnt_time_diff(&time_wait, &timer, &(eltd->timer));
	lcnt_update_stats(stats, eltd->lock_in_conflict, &time_wait);
	
	ASSERT(eltd->timer_set >= 0);
    } else {
	lcnt_update_stats(stats, eltd->lock_in_conflict, NULL);
    }
	
}

/* unlock */

void erts_lcnt_unlock_opt(erts_lcnt_lock_t *lock, Uint16 option) {
    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;
    if (option & ERTS_LCNT_LO_WRITE) ethr_atomic_dec(&lock->w_state);
    if (option & ERTS_LCNT_LO_READ ) ethr_atomic_dec(&lock->r_state);
}

void erts_lcnt_unlock(erts_lcnt_lock_t *lock) {
#ifdef DEBUG
    long w_state;  
    long flowstate;
#endif
    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;
#ifdef DEBUG
    /* flowstate */
    ethr_atomic_read(&lock->flowstate, &flowstate);
    ASSERT(flowstate == 1);
    ethr_atomic_dec( &lock->flowstate);
    
    /* write state */
    ethr_atomic_read(&lock->w_state, &w_state);
    ASSERT(w_state > 0)
#endif
    ethr_atomic_dec(&lock->w_state);
}

/* trylock */

void erts_lcnt_trylock_opt(erts_lcnt_lock_t *lock, int res, Uint16 option) {
    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;
    /* Determine lock_state via res instead of state */
    if (res != EBUSY) {
	if (option & ERTS_LCNT_LO_WRITE) ethr_atomic_inc(&lock->w_state);
	if (option & ERTS_LCNT_LO_READ ) ethr_atomic_inc(&lock->r_state);
	lcnt_update_stats(&(lock->stats[0]), 0, NULL);
    } else {
        ethr_atomic_inc(&lock->stats[0].tries);
        ethr_atomic_inc(&lock->stats[0].colls);
    }
}

   
void erts_lcnt_trylock(erts_lcnt_lock_t *lock, int res) {
    /* Determine lock_state via res instead of state */
#ifdef DEBUG
    long flowstate;
#endif 
    if (erts_lcnt_rt_options & ERTS_LCNT_OPT_SUSPEND) return;
    if (res != EBUSY) {
	
#ifdef DEBUG
    	ethr_atomic_read(&lock->flowstate, &flowstate);
	ASSERT(flowstate == 0);
    	ethr_atomic_inc( &lock->flowstate);
#endif
	ethr_atomic_inc(&lock->w_state);
	
	lcnt_update_stats(&(lock->stats[0]), 0, NULL);

    } else {
        ethr_atomic_inc(&lock->stats[0].tries);
        ethr_atomic_inc(&lock->stats[0].colls);
    }
}

/* thread operations */

static void *lcnt_thr_init(erts_lcnt_thread_data_t *eltd) {
    void *(*function)(void *);
    void *argument;
    void *res;
    function = eltd->function;
    argument = eltd->argument;
    
    ethr_tsd_set(lcnt_thr_data_key, eltd);
    
    res = (void *)function(argument);
    free(eltd);
    return (void *)res;
}

    

int erts_lcnt_thr_create(ethr_tid *tid, void * (*function)(void *), void *arg, ethr_thr_opts *opts) {
    erts_lcnt_thread_data_t *eltd;
    
    lcnt_lock();
    /* lock for thread id global update */
    eltd = lcnt_thread_data_alloc();
    lcnt_unlock();
    
    eltd->function = function;
    eltd->argument = arg;

    return ethr_thr_create(tid, (void *)lcnt_thr_init, (void *)eltd, opts);
}


/* bindings for bifs */

Uint16 erts_lcnt_set_rt_opt(Uint16 opt) {
    Uint16 prev;
    prev = (erts_lcnt_rt_options & opt);
    erts_lcnt_rt_options |= opt;
    return prev;
}

Uint16 erts_lcnt_clear_rt_opt(Uint16 opt) {			
    Uint16 prev;
    prev = (erts_lcnt_rt_options & opt);
    erts_lcnt_rt_options &= ~opt;
    return prev;
}

void erts_lcnt_clear_counters(void) {
    erts_lcnt_lock_t *lock;
    erts_lcnt_lock_list_t *list;
    erts_lcnt_lock_stats_t *stats;
    int i;

    lcnt_lock();

    list = erts_lcnt_data->current_locks;
    
    for (lock = list->head; lock != NULL; lock = lock->next) {
    	for( i = 0; i < ERTS_LCNT_MAX_LOCK_LOCATIONS; i++) {
	    stats = &lock->stats[i];
	    lcnt_clear_stats(stats);
    	}
	lock->n_stats = 1;
    }

    /* empty deleted locks in lock list */
    erts_lcnt_list_clear(erts_lcnt_data->deleted_locks);

    lcnt_time(&timer_start);

    lcnt_unlock();
}

erts_lcnt_data_t *erts_lcnt_get_data(void) {
    erts_lcnt_time_t timer_stop;
    
    lcnt_lock();
    
    lcnt_time(&timer_stop);
    lcnt_time_diff(&(erts_lcnt_data->duration), &timer_stop, &timer_start);
    
    lcnt_unlock();
    
    return erts_lcnt_data;
}

char *erts_lcnt_lock_type(Uint16 type) {
    return lcnt_lock_type(type);
}

#endif /* ifdef ERTS_ENABLE_LOCK_COUNT */