[urcu.git] / tests / benchmark / test_rwlock.c

// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later

/*
 * Userspace RCU library - test program
 */

#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>

#include <urcu/arch.h>
#include <urcu/assert.h>
#include <urcu/tls-compat.h>
#include "thread-id.h"

/* hardcoded number of CPUs */
#define NR_CPUS 16384

#ifndef DYNAMIC_LINK_TEST
#define _LGPL_SOURCE
#endif
#include <urcu.h>

struct test_array {
	int a;
};

/*
 * static rwlock initializer is broken on Cygwin. Use runtime
 * initialization.
 */
pthread_rwlock_t lock;

static unsigned long wdelay;

static volatile struct test_array test_array = { 8 };

static unsigned long duration;

/* read-side C.S. duration, in loops */
static unsigned long rduration;

/* write-side C.S. duration, in loops */
static unsigned long wduration;

static inline void loop_sleep(unsigned long loops)
{
	while (loops-- != 0)
		caa_cpu_relax();
}

static int verbose_mode;

#define printf_verbose(fmt, args...)		\
	do {					\
		if (verbose_mode)		\
			printf(fmt, args);	\
	} while (0)

static unsigned int cpu_affinities[NR_CPUS];
static unsigned int next_aff = 0;
static int use_affinity = 0;

pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;

static void set_affinity(void)
{
#ifdef HAVE_SCHED_SETAFFINITY
	cpu_set_t mask;
	int cpu, ret;
#endif /* HAVE_SCHED_SETAFFINITY */

	if (!use_affinity)
		return;

#ifdef HAVE_SCHED_SETAFFINITY
	ret = pthread_mutex_lock(&affinity_mutex);
	if (ret) {
		perror("Error in pthread mutex lock");
		exit(-1);
	}
	cpu = cpu_affinities[next_aff++];
	ret = pthread_mutex_unlock(&affinity_mutex);
	if (ret) {
		perror("Error in pthread mutex unlock");
		exit(-1);
	}

	CPU_ZERO(&mask);
	CPU_SET(cpu, &mask);
	sched_setaffinity(0, sizeof(mask), &mask);
#endif /* HAVE_SCHED_SETAFFINITY */
}

static DEFINE_URCU_TLS(unsigned long long, nr_writes);
static DEFINE_URCU_TLS(unsigned long long, nr_reads);

static unsigned int nr_readers;
static unsigned int nr_writers;

pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;

static
void *thr_reader(void *_count)
{
	unsigned long long *count = _count;

	printf_verbose("thread_begin %s, tid %lu\n",
			"reader", urcu_get_thread_id());

	set_affinity();

	wait_until_go();

	for (;;) {
		int a, ret;

		ret = pthread_rwlock_rdlock(&lock);
		if (ret) {
			fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
			abort();
		}

		a = test_array.a;
		urcu_posix_assert(a == 8);
		if (caa_unlikely(rduration))
			loop_sleep(rduration);

		ret = pthread_rwlock_unlock(&lock);
		if (ret) {
			fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
			abort();
		}

		URCU_TLS(nr_reads)++;
		if (caa_unlikely(!test_duration_read()))
			break;
	}

	*count = URCU_TLS(nr_reads);

	printf_verbose("thread_end %s, tid %lu, count %llu\n",
			"reader", urcu_get_thread_id(), *count);
	return ((void*)1);

}

static
void *thr_writer(void *_count)
{
	unsigned long long *count = _count;

	printf_verbose("thread_begin %s, tid %lu\n",
			"writer", urcu_get_thread_id());

	set_affinity();

	wait_until_go();

	for (;;) {
		int ret;

		ret = pthread_rwlock_wrlock(&lock);
		if (ret) {
			fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
			abort();
		}

		test_array.a = 0;
		test_array.a = 8;
		if (caa_unlikely(wduration))
			loop_sleep(wduration);

		ret = pthread_rwlock_unlock(&lock);
		if (ret) {
			fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
			abort();
		}

		URCU_TLS(nr_writes)++;
		if (caa_unlikely(!test_duration_write()))
			break;
		if (caa_unlikely(wdelay))
			loop_sleep(wdelay);
	}
	*count = URCU_TLS(nr_writes);

	printf_verbose("thread_end %s, tid %lu, count %llu\n",
			"writer", urcu_get_thread_id(), *count);
	return ((void*)2);
}

static
void show_usage(char **argv)
{
	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
		argv[0]);
	printf("OPTIONS:\n");
	printf("	[-d delay] (writer period (us))\n");
	printf("	[-c duration] (reader C.S. duration (in loops))\n");
	printf("	[-e duration] (writer C.S. duration (in loops))\n");
	printf("	[-v] (verbose output)\n");
	printf("	[-a cpu#] [-a cpu#]... (affinity)\n");
	printf("\n");
}

int main(int argc, char **argv)
{
	int err;
	pthread_t *tid_reader, *tid_writer;
	void *tret;
	unsigned long long *count_reader, *count_writer;
	unsigned long long tot_reads = 0, tot_writes = 0;
	int i, a;
	unsigned int i_thr;

	if (argc < 4) {
		show_usage(argv);
		return -1;
	}
	cmm_smp_mb();

	err = sscanf(argv[1], "%u", &nr_readers);
	if (err != 1) {
		show_usage(argv);
		return -1;
	}

	err = sscanf(argv[2], "%u", &nr_writers);
	if (err != 1) {
		show_usage(argv);
		return -1;
	}
	
	err = sscanf(argv[3], "%lu", &duration);
	if (err != 1) {
		show_usage(argv);
		return -1;
	}

	for (i = 4; i < argc; i++) {
		if (argv[i][0] != '-')
			continue;
		switch (argv[i][1]) {
		case 'a':
			if (argc < i + 2) {
				show_usage(argv);
				return -1;
			}
			a = atoi(argv[++i]);
			cpu_affinities[next_aff++] = a;
			use_affinity = 1;
			printf_verbose("Adding CPU %d affinity\n", a);
			break;
		case 'c':
			if (argc < i + 2) {
				show_usage(argv);
				return -1;
			}
			rduration = atol(argv[++i]);
			break;
		case 'd':
			if (argc < i + 2) {
				show_usage(argv);
				return -1;
			}
			wdelay = atol(argv[++i]);
			break;
		case 'e':
			if (argc < i + 2) {
				show_usage(argv);
				return -1;
			}
			wduration = atol(argv[++i]);
			break;
		case 'v':
			verbose_mode = 1;
			break;
		}
	}

	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
		duration, nr_readers, nr_writers);
	printf_verbose("Writer delay : %lu loops.\n", wdelay);
	printf_verbose("Writer duration : %lu loops.\n", wduration);
	printf_verbose("Reader duration : %lu loops.\n", rduration);
	printf_verbose("thread %-6s, tid %lu\n",
			"main", urcu_get_thread_id());

	err = pthread_rwlock_init(&lock, NULL);
	if (err != 0) {
		fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
		exit(1);
	}

	tid_reader = calloc(nr_readers, sizeof(*tid_reader));
	tid_writer = calloc(nr_writers, sizeof(*tid_writer));
	count_reader = calloc(nr_readers, sizeof(*count_reader));
	count_writer = calloc(nr_writers, sizeof(*count_writer));

	next_aff = 0;

	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
		err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
				     &count_reader[i_thr]);
		if (err != 0)
			exit(1);
	}
	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
		err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
				     &count_writer[i_thr]);
		if (err != 0)
			exit(1);
	}

	test_for(duration);

	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
		err = pthread_join(tid_reader[i_thr], &tret);
		if (err != 0)
			exit(1);
		tot_reads += count_reader[i_thr];
	}
	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
		err = pthread_join(tid_writer[i_thr], &tret);
		if (err != 0)
			exit(1);
		tot_writes += count_writer[i_thr];
	}

	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
	       tot_writes);
	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
		"nr_writers %3u "
		"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
		argv[0], duration, nr_readers, rduration, wduration,
		nr_writers, wdelay, tot_reads, tot_writes,
		tot_reads + tot_writes);

	err = pthread_rwlock_destroy(&lock);
	if (err != 0) {
		fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
		exit(1);
	}
	free(tid_reader);
	free(tid_writer);
	free(count_reader);
	free(count_writer);
	return 0;
}
Commit	Line	Data
ce29b371 MJ	1	// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	2	//
	3	// SPDX-License-Identifier: GPL-2.0-or-later
	4
10c48e14	5	/*
10c48e14	6	* Userspace RCU library - test program
10c48e14 MD	7	*/
	8
	9	#include <stdio.h>
	10	#include <pthread.h>
	11	#include <stdlib.h>
	12	#include <string.h>
	13	#include <sys/types.h>
	14	#include <sys/wait.h>
	15	#include <unistd.h>
	16	#include <stdio.h>
94b343fd	17	#include <errno.h>
10c48e14	18
ec4e58a3	19	#include <urcu/arch.h>
01477510	20	#include <urcu/assert.h>
bd252a04	21	#include <urcu/tls-compat.h>
94df6318	22	#include "thread-id.h"
65fcc7e9	23
2a7ac59d MD	24	/* hardcoded number of CPUs */
	25	#define NR_CPUS 16384
	26
10c48e14 MD	27	#ifndef DYNAMIC_LINK_TEST
10c48e14 MD	28	#define _LGPL_SOURCE
10c48e14	29	#endif
ec4e58a3	30	#include <urcu.h>
10c48e14 MD	31
	32	struct test_array {
	33	int a;
	34	};
	35
89a6a9ce MJ	36	/*
	37	* static rwlock initializer is broken on Cygwin. Use runtime
	38	* initialization.
	39	*/
	40	pthread_rwlock_t lock;
10c48e14	41
9e31d0f0	42	static unsigned long wdelay;
10c48e14	43
2b4e4125	44	static volatile struct test_array test_array = { 8 };
10c48e14 MD	45
10c48e14 MD	46	static unsigned long duration;
10c48e14	47
daddf5b0	48	/* read-side C.S. duration, in loops */
8b632bab MD	49	static unsigned long rduration;
8b632bab MD	50
31b598e0 MD	51	/* write-side C.S. duration, in loops */
	52	static unsigned long wduration;
	53
ab0aacbe	54	static inline void loop_sleep(unsigned long loops)
daddf5b0	55	{
ab0aacbe	56	while (loops-- != 0)
06f22bdb	57	caa_cpu_relax();
daddf5b0 MD	58	}
daddf5b0 MD	59
4bad7d45 MD	60	static int verbose_mode;
	61
	62	#define printf_verbose(fmt, args...) \
	63	do { \
	64	if (verbose_mode) \
	65	printf(fmt, args); \
	66	} while (0)
	67
2a7ac59d MD	68	static unsigned int cpu_affinities[NR_CPUS];
	69	static unsigned int next_aff = 0;
	70	static int use_affinity = 0;
	71
6af882ba MD	72	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
6af882ba MD	73
2a7ac59d MD	74	static void set_affinity(void)
2a7ac59d MD	75	{
2388c075	76	#ifdef HAVE_SCHED_SETAFFINITY
2a7ac59d	77	cpu_set_t mask;
95bc7fb9 MD	78	int cpu, ret;
95bc7fb9 MD	79	#endif /* HAVE_SCHED_SETAFFINITY */
2a7ac59d MD	80
	81	if (!use_affinity)
	82	return;
	83
2388c075	84	#ifdef HAVE_SCHED_SETAFFINITY
6af882ba MD	85	ret = pthread_mutex_lock(&affinity_mutex);
	86	if (ret) {
	87	perror("Error in pthread mutex lock");
	88	exit(-1);
	89	}
2a7ac59d	90	cpu = cpu_affinities[next_aff++];
6af882ba MD	91	ret = pthread_mutex_unlock(&affinity_mutex);
	92	if (ret) {
	93	perror("Error in pthread mutex unlock");
	94	exit(-1);
	95	}
d8540fc5	96
2a7ac59d MD	97	CPU_ZERO(&mask);
	98	CPU_SET(cpu, &mask);
	99	sched_setaffinity(0, sizeof(mask), &mask);
d8540fc5	100	#endif /* HAVE_SCHED_SETAFFINITY */
2a7ac59d MD	101	}
2a7ac59d MD	102
bd252a04 MD	103	static DEFINE_URCU_TLS(unsigned long long, nr_writes);
bd252a04 MD	104	static DEFINE_URCU_TLS(unsigned long long, nr_reads);
10c48e14 MD	105
	106	static unsigned int nr_readers;
	107	static unsigned int nr_writers;
	108
	109	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	110
61c3fb60	111	static
10c48e14 MD	112	void thr_reader(void _count)
	113	{
	114	unsigned long long *count = _count;
	115
94df6318 MD	116	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	117	"reader", urcu_get_thread_id());
10c48e14	118
2a7ac59d MD	119	set_affinity();
2a7ac59d MD	120
9e4e7ad1	121	wait_until_go();
10c48e14 MD	122
10c48e14 MD	123	for (;;) {
89a6a9ce MJ	124	int a, ret;
	125
	126	ret = pthread_rwlock_rdlock(&lock);
	127	if (ret) {
	128	fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
	129	abort();
	130	}
efa8d2c8	131
efa8d2c8	132	a = test_array.a;
01477510	133	urcu_posix_assert(a == 8);
a0b7f7ea	134	if (caa_unlikely(rduration))
daddf5b0	135	loop_sleep(rduration);
89a6a9ce MJ	136
	137	ret = pthread_rwlock_unlock(&lock);
	138	if (ret) {
	139	fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
	140	abort();
	141	}
	142
bd252a04	143	URCU_TLS(nr_reads)++;
a0b7f7ea	144	if (caa_unlikely(!test_duration_read()))
10c48e14 MD	145	break;
	146	}
	147
bd252a04	148	*count = URCU_TLS(nr_reads);
aae4fe1d MJ	149
	150	printf_verbose("thread_end %s, tid %lu, count %llu\n",
	151	"reader", urcu_get_thread_id(), *count);
10c48e14 MD	152	return ((void*)1);
	153
	154	}
	155
61c3fb60	156	static
10c48e14 MD	157	void thr_writer(void _count)
	158	{
	159	unsigned long long *count = _count;
	160
94df6318 MD	161	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	162	"writer", urcu_get_thread_id());
10c48e14	163
2a7ac59d MD	164	set_affinity();
2a7ac59d MD	165
9e4e7ad1	166	wait_until_go();
10c48e14 MD	167
10c48e14 MD	168	for (;;) {
89a6a9ce MJ	169	int ret;
	170
	171	ret = pthread_rwlock_wrlock(&lock);
	172	if (ret) {
	173	fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
	174	abort();
	175	}
	176
2b4e4125	177	test_array.a = 0;
10c48e14	178	test_array.a = 8;
a0b7f7ea	179	if (caa_unlikely(wduration))
31b598e0	180	loop_sleep(wduration);
89a6a9ce MJ	181
	182	ret = pthread_rwlock_unlock(&lock);
	183	if (ret) {
	184	fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
	185	abort();
	186	}
	187
bd252a04	188	URCU_TLS(nr_writes)++;
a0b7f7ea	189	if (caa_unlikely(!test_duration_write()))
10c48e14	190	break;
a0b7f7ea	191	if (caa_unlikely(wdelay))
9e31d0f0	192	loop_sleep(wdelay);
10c48e14	193	}
bd252a04	194	*count = URCU_TLS(nr_writes);
aae4fe1d MJ	195
	196	printf_verbose("thread_end %s, tid %lu, count %llu\n",
	197	"writer", urcu_get_thread_id(), *count);
10c48e14 MD	198	return ((void*)2);
	199	}
	200
61c3fb60	201	static
70469b43	202	void show_usage(char **argv)
10c48e14	203	{
06637138 MD	204	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
	205	argv[0]);
	206	printf("OPTIONS:\n");
06637138 MD	207	printf(" [-d delay] (writer period (us))\n");
	208	printf(" [-c duration] (reader C.S. duration (in loops))\n");
	209	printf(" [-e duration] (writer C.S. duration (in loops))\n");
	210	printf(" [-v] (verbose output)\n");
	211	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
10c48e14 MD	212	printf("\n");
	213	}
	214
	215	int main(int argc, char **argv)
	216	{
	217	int err;
	218	pthread_t tid_reader, tid_writer;
	219	void *tret;
	220	unsigned long long count_reader, count_writer;
	221	unsigned long long tot_reads = 0, tot_writes = 0;
9e97e478	222	int i, a;
83e334d0	223	unsigned int i_thr;
10c48e14 MD	224
10c48e14 MD	225	if (argc < 4) {
70469b43	226	show_usage(argv);
10c48e14 MD	227	return -1;
10c48e14 MD	228	}
5481ddb3	229	cmm_smp_mb();
10c48e14 MD	230
	231	err = sscanf(argv[1], "%u", &nr_readers);
	232	if (err != 1) {
70469b43	233	show_usage(argv);
10c48e14 MD	234	return -1;
	235	}
	236
	237	err = sscanf(argv[2], "%u", &nr_writers);
	238	if (err != 1) {
70469b43	239	show_usage(argv);
10c48e14 MD	240	return -1;
	241	}
	242
	243	err = sscanf(argv[3], "%lu", &duration);
	244	if (err != 1) {
70469b43	245	show_usage(argv);
10c48e14 MD	246	return -1;
	247	}
	248
	249	for (i = 4; i < argc; i++) {
	250	if (argv[i][0] != '-')
	251	continue;
	252	switch (argv[i][1]) {
9e97e478 MD	253	case 'a':
9e97e478 MD	254	if (argc < i + 2) {
70469b43	255	show_usage(argv);
9e97e478 MD	256	return -1;
	257	}
	258	a = atoi(argv[++i]);
2a7ac59d	259	cpu_affinities[next_aff++] = a;
9e97e478	260	use_affinity = 1;
4bad7d45	261	printf_verbose("Adding CPU %d affinity\n", a);
9e97e478	262	break;
8b632bab MD	263	case 'c':
8b632bab MD	264	if (argc < i + 2) {
70469b43	265	show_usage(argv);
8b632bab MD	266	return -1;
8b632bab MD	267	}
9e31d0f0	268	rduration = atol(argv[++i]);
8b632bab	269	break;
10c48e14 MD	270	case 'd':
10c48e14 MD	271	if (argc < i + 2) {
70469b43	272	show_usage(argv);
10c48e14 MD	273	return -1;
10c48e14 MD	274	}
9e31d0f0	275	wdelay = atol(argv[++i]);
10c48e14	276	break;
31b598e0 MD	277	case 'e':
31b598e0 MD	278	if (argc < i + 2) {
70469b43	279	show_usage(argv);
31b598e0 MD	280	return -1;
	281	}
	282	wduration = atol(argv[++i]);
	283	break;
4bad7d45 MD	284	case 'v':
	285	verbose_mode = 1;
	286	break;
10c48e14 MD	287	}
	288	}
	289
4bad7d45	290	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
10c48e14	291	duration, nr_readers, nr_writers);
9e31d0f0	292	printf_verbose("Writer delay : %lu loops.\n", wdelay);
aae4fe1d	293	printf_verbose("Writer duration : %lu loops.\n", wduration);
4bad7d45	294	printf_verbose("Reader duration : %lu loops.\n", rduration);
94df6318 MD	295	printf_verbose("thread %-6s, tid %lu\n",
94df6318 MD	296	"main", urcu_get_thread_id());
10c48e14	297
89a6a9ce MJ	298	err = pthread_rwlock_init(&lock, NULL);
	299	if (err != 0) {
	300	fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
	301	exit(1);
	302	}
	303
9aa14175 MD	304	tid_reader = calloc(nr_readers, sizeof(*tid_reader));
	305	tid_writer = calloc(nr_writers, sizeof(*tid_writer));
	306	count_reader = calloc(nr_readers, sizeof(*count_reader));
	307	count_writer = calloc(nr_writers, sizeof(*count_writer));
10c48e14	308
2a7ac59d MD	309	next_aff = 0;
2a7ac59d MD	310
83e334d0 MJ	311	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
	312	err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
	313	&count_reader[i_thr]);
10c48e14 MD	314	if (err != 0)
	315	exit(1);
	316	}
83e334d0 MJ	317	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
	318	err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
	319	&count_writer[i_thr]);
10c48e14 MD	320	if (err != 0)
	321	exit(1);
	322	}
	323
9e4e7ad1	324	test_for(duration);
78efb485	325
83e334d0 MJ	326	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
83e334d0 MJ	327	err = pthread_join(tid_reader[i_thr], &tret);
10c48e14 MD	328	if (err != 0)
10c48e14 MD	329	exit(1);
83e334d0	330	tot_reads += count_reader[i_thr];
10c48e14	331	}
83e334d0 MJ	332	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
83e334d0 MJ	333	err = pthread_join(tid_writer[i_thr], &tret);
10c48e14 MD	334	if (err != 0)
10c48e14 MD	335	exit(1);
83e334d0	336	tot_writes += count_writer[i_thr];
10c48e14	337	}
4bad7d45 MD	338
4bad7d45 MD	339	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
10c48e14	340	tot_writes);
a50a7b43	341	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
cda3c71d	342	"nr_writers %3u "
9e31d0f0	343	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
a50a7b43	344	argv[0], duration, nr_readers, rduration, wduration,
4bad7d45 MD	345	nr_writers, wdelay, tot_reads, tot_writes,
	346	tot_reads + tot_writes);
	347
89a6a9ce MJ	348	err = pthread_rwlock_destroy(&lock);
	349	if (err != 0) {
	350	fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
	351	exit(1);
	352	}
10c48e14 MD	353	free(tid_reader);
	354	free(tid_writer);
	355	free(count_reader);
	356	free(count_writer);
	357	return 0;
	358	}