[urcu.git] / test_qsbr.c

/*
 * test_urcu.c
 *
 * Userspace RCU library - test program
 *
 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define _GNU_SOURCE
#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 <assert.h>
#include <sys/syscall.h>
#include <sched.h>

#include "arch.h"

#if defined(_syscall0)
_syscall0(pid_t, gettid)
#elif defined(__NR_gettid)
static inline pid_t gettid(void)
{
	return syscall(__NR_gettid);
}
#else
#warning "use pid as tid"
static inline pid_t gettid(void)
{
	return getpid();
}
#endif

#define _LGPL_SOURCE
#include "urcu-qsbr.h"

struct test_array {
	int a;
};

static volatile int test_go, test_stop;

static int wdelay;

static struct test_array *test_rcu_pointer;

static unsigned long duration;

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

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

static int verbose_mode;

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

/*
 * returns 0 if test should end.
 */
static int test_duration_write(void)
{
	return !test_stop;
}

static int test_duration_read(void)
{
	return !test_stop;
}

static unsigned long long __thread nr_writes;
static unsigned long long __thread nr_reads;

static unsigned int nr_readers;
static unsigned int nr_writers;

pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;

void rcu_copy_mutex_lock(void)
{
	int ret;
	ret = pthread_mutex_lock(&rcu_copy_mutex);
	if (ret) {
		perror("Error in pthread mutex lock");
		exit(-1);
	}
}

void rcu_copy_mutex_unlock(void)
{
	int ret;

	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	if (ret) {
		perror("Error in pthread mutex unlock");
		exit(-1);
	}
}

/*
 * malloc/free are reusing memory areas too quickly, which does not let us
 * test races appropriately. Use a large circular array for allocations.
 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
 */
#define ARRAY_SIZE (1048576 * nr_writers)
#define ARRAY_POISON 0xDEADBEEF
static int array_index;
static struct test_array *test_array;

static struct test_array *test_array_alloc(void)
{
	struct test_array *ret;
	int index;

	rcu_copy_mutex_lock();
	index = array_index % ARRAY_SIZE;
	assert(test_array[index].a == ARRAY_POISON ||
		test_array[index].a == 0);
	ret = &test_array[index];
	array_index++;
	if (array_index == ARRAY_SIZE)
		array_index = 0;
	rcu_copy_mutex_unlock();
	return ret;
}

static void test_array_free(struct test_array *ptr)
{
	if (!ptr)
		return;
	rcu_copy_mutex_lock();
	ptr->a = ARRAY_POISON;
	rcu_copy_mutex_unlock();
}

void *thr_reader(void *_count)
{
	unsigned long long *count = _count;
	struct test_array *local_ptr;

	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
			"reader", pthread_self(), (unsigned long)gettid());

	rcu_register_thread();

	while (!test_go)
	{
	}
	smp_mb();

	for (;;) {
		_rcu_read_lock();
		local_ptr = _rcu_dereference(test_rcu_pointer);
		debug_yield_read();
		if (local_ptr)
			assert(local_ptr->a == 8);
		if (unlikely(rduration))
			loop_sleep(rduration);
		_rcu_read_unlock();
		nr_reads++;
		/* QS each 1024 reads */
		if (unlikely((nr_reads & ((1 << 10) - 1)) == 0))
			_rcu_quiescent_state();
		if (unlikely(!test_duration_read()))
			break;
	}

	rcu_unregister_thread();

	*count = nr_reads;
	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
			"reader", pthread_self(), (unsigned long)gettid());
	return ((void*)1);

}

void *thr_writer(void *_count)
{
	unsigned long long *count = _count;
	struct test_array *new, *old;

	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
			"writer", pthread_self(), (unsigned long)gettid());

	while (!test_go)
	{
	}
	smp_mb();

	for (;;) {
		new = test_array_alloc();
		rcu_copy_mutex_lock();
		old = test_rcu_pointer;
		if (old)
			assert(old->a == 8);
		new->a = 8;
		old = _rcu_publish_content(&test_rcu_pointer, new);
		rcu_copy_mutex_unlock();
		/* can be done after unlock */
		if (old)
			old->a = 0;
		test_array_free(old);
		nr_writes++;
		if (unlikely(!test_duration_write()))
			break;
		if (unlikely(wdelay))
			usleep(wdelay);
	}

	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
			"writer", pthread_self(), (unsigned long)gettid());
	*count = nr_writes;
	return ((void*)2);
}

void show_usage(int argc, char **argv)
{
	printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
#ifdef DEBUG_YIELD
	printf(" [-r] [-w] (yield reader and/or writer)");
#endif
	printf(" [-d delay] (writer period (us))");
	printf(" [-c duration] (reader C.S. duration (in loops))");
	printf(" [-v] (verbose output)");
	printf(" [-a cpu#] [-a cpu#]... (affinity)");
	printf("\n");
}

cpu_set_t affinity;

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;
	int use_affinity = 0;

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

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

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

	CPU_ZERO(&affinity);

	for (i = 4; i < argc; i++) {
		if (argv[i][0] != '-')
			continue;
		switch (argv[i][1]) {
#ifdef DEBUG_YIELD
		case 'r':
			yield_active |= YIELD_READ;
			break;
		case 'w':
			yield_active |= YIELD_WRITE;
			break;
#endif
		case 'a':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			a = atoi(argv[++i]);
			CPU_SET(a, &affinity);
			use_affinity = 1;
			printf_verbose("Adding CPU %d affinity\n", a);
			break;
		case 'c':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			rduration = atoi(argv[++i]);
			break;
		case 'd':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			wdelay = atoi(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 : %u us.\n", wdelay);
	printf_verbose("Reader duration : %lu loops.\n", rduration);
	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
			"main", pthread_self(), (unsigned long)gettid());

	if (use_affinity
	    && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
		perror("sched_setaffinity");
		exit(-1);
	}

	test_array = malloc(sizeof(*test_array) * ARRAY_SIZE);
	tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
	tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
	count_reader = malloc(sizeof(*count_reader) * nr_readers);
	count_writer = malloc(sizeof(*count_writer) * nr_writers);

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

	smp_mb();

	test_go = 1;

	sleep(duration);

	test_stop = 1;

	for (i = 0; i < nr_readers; i++) {
		err = pthread_join(tid_reader[i], &tret);
		if (err != 0)
			exit(1);
		tot_reads += count_reader[i];
	}
	for (i = 0; i < nr_writers; i++) {
		err = pthread_join(tid_writer[i], &tret);
		if (err != 0)
			exit(1);
		tot_writes += count_writer[i];
	}
	
	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
	       tot_writes);
	printf("SUMMARY %-15s testdur %4lu nr_readers %3u rdur %6lu "
		"nr_writers %3u "
		"wdelay %4u nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
		argv[0], duration, nr_readers, rduration,
		nr_writers, wdelay, tot_reads, tot_writes,
		tot_reads + tot_writes);
	test_array_free(test_rcu_pointer);
	free(test_array);
	free(tid_reader);
	free(tid_writer);
	free(count_reader);
	free(count_writer);
	return 0;
}
Commit	Line	Data
061159a0 MD	1	/*
	2	* test_urcu.c
	3	*
	4	* Userspace RCU library - test program
	5	*
	6	* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along
	19	* with this program; if not, write to the Free Software Foundation, Inc.,
	20	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	21	*/
	22
9e97e478	23	#define _GNU_SOURCE
061159a0 MD	24	#include <stdio.h>
	25	#include <pthread.h>
	26	#include <stdlib.h>
	27	#include <string.h>
	28	#include <sys/types.h>
	29	#include <sys/wait.h>
	30	#include <unistd.h>
	31	#include <stdio.h>
	32	#include <assert.h>
	33	#include <sys/syscall.h>
9e97e478	34	#include <sched.h>
061159a0	35
7685d963 MD	36	#include "arch.h"
7685d963 MD	37
061159a0 MD	38	#if defined(_syscall0)
	39	_syscall0(pid_t, gettid)
	40	#elif defined(__NR_gettid)
	41	static inline pid_t gettid(void)
	42	{
	43	return syscall(__NR_gettid);
	44	}
	45	#else
	46	#warning "use pid as tid"
	47	static inline pid_t gettid(void)
	48	{
	49	return getpid();
	50	}
	51	#endif
	52
	53	#define _LGPL_SOURCE
	54	#include "urcu-qsbr.h"
	55
	56	struct test_array {
	57	int a;
	58	};
	59
78efb485	60	static volatile int test_go, test_stop;
061159a0 MD	61
	62	static int wdelay;
	63
	64	static struct test_array *test_rcu_pointer;
	65
	66	static unsigned long duration;
061159a0	67
daddf5b0	68	/* read-side C.S. duration, in loops */
8b632bab MD	69	static unsigned long rduration;
8b632bab MD	70
daddf5b0 MD	71	static inline void loop_sleep(unsigned long l)
	72	{
	73	while(l-- != 0)
	74	cpu_relax();
	75	}
	76
4bad7d45 MD	77	static int verbose_mode;
	78
	79	#define printf_verbose(fmt, args...) \
	80	do { \
	81	if (verbose_mode) \
	82	printf(fmt, args); \
	83	} while (0)
	84
061159a0 MD	85	/*
	86	* returns 0 if test should end.
	87	*/
	88	static int test_duration_write(void)
	89	{
78efb485	90	return !test_stop;
061159a0 MD	91	}
	92
	93	static int test_duration_read(void)
	94	{
78efb485	95	return !test_stop;
061159a0 MD	96	}
	97
	98	static unsigned long long __thread nr_writes;
	99	static unsigned long long __thread nr_reads;
	100
	101	static unsigned int nr_readers;
	102	static unsigned int nr_writers;
	103
	104	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	105
	106	void rcu_copy_mutex_lock(void)
	107	{
	108	int ret;
	109	ret = pthread_mutex_lock(&rcu_copy_mutex);
	110	if (ret) {
	111	perror("Error in pthread mutex lock");
	112	exit(-1);
	113	}
	114	}
	115
	116	void rcu_copy_mutex_unlock(void)
	117	{
	118	int ret;
	119
	120	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	121	if (ret) {
	122	perror("Error in pthread mutex unlock");
	123	exit(-1);
	124	}
	125	}
	126
	127	/*
	128	* malloc/free are reusing memory areas too quickly, which does not let us
	129	* test races appropriately. Use a large circular array for allocations.
	130	* ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
	131	*/
	132	#define ARRAY_SIZE (1048576 * nr_writers)
	133	#define ARRAY_POISON 0xDEADBEEF
	134	static int array_index;
	135	static struct test_array *test_array;
	136
	137	static struct test_array *test_array_alloc(void)
	138	{
	139	struct test_array *ret;
	140	int index;
	141
	142	rcu_copy_mutex_lock();
	143	index = array_index % ARRAY_SIZE;
	144	assert(test_array[index].a == ARRAY_POISON \|\|
	145	test_array[index].a == 0);
	146	ret = &test_array[index];
	147	array_index++;
	148	if (array_index == ARRAY_SIZE)
	149	array_index = 0;
	150	rcu_copy_mutex_unlock();
	151	return ret;
	152	}
	153
	154	static void test_array_free(struct test_array *ptr)
	155	{
	156	if (!ptr)
	157	return;
	158	rcu_copy_mutex_lock();
	159	ptr->a = ARRAY_POISON;
160	rcu_copy_mutex_unlock();
161	}
162
163	void thr_reader(void _count)
164	{
165	unsigned long long *count = _count;
166	struct test_array *local_ptr;
167
4bad7d45	168	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
061159a0 MD	169	"reader", pthread_self(), (unsigned long)gettid());
	170
	171	rcu_register_thread();
	172
	173	while (!test_go)
	174	{
	175	}
7685d963	176	smp_mb();
061159a0 MD	177
	178	for (;;) {
	179	_rcu_read_lock();
	180	local_ptr = _rcu_dereference(test_rcu_pointer);
	181	debug_yield_read();
	182	if (local_ptr)
	183	assert(local_ptr->a == 8);
8b632bab	184	if (unlikely(rduration))
daddf5b0	185	loop_sleep(rduration);
061159a0 MD	186	_rcu_read_unlock();
061159a0 MD	187	nr_reads++;
78efb485	188	/* QS each 1024 reads */
59d5a406	189	if (unlikely((nr_reads & ((1 << 10) - 1)) == 0))
061159a0	190	_rcu_quiescent_state();
59d5a406	191	if (unlikely(!test_duration_read()))
061159a0 MD	192	break;
	193	}
	194
	195	rcu_unregister_thread();
	196
	197	*count = nr_reads;
4bad7d45	198	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
061159a0 MD	199	"reader", pthread_self(), (unsigned long)gettid());
	200	return ((void*)1);
	201
	202	}
	203
	204	void thr_writer(void _count)
	205	{
	206	unsigned long long *count = _count;
	207	struct test_array new, old;
	208
4bad7d45	209	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
061159a0 MD	210	"writer", pthread_self(), (unsigned long)gettid());
	211
	212	while (!test_go)
	213	{
	214	}
7685d963	215	smp_mb();
061159a0 MD	216
	217	for (;;) {
	218	new = test_array_alloc();
	219	rcu_copy_mutex_lock();
	220	old = test_rcu_pointer;
	221	if (old)
	222	assert(old->a == 8);
	223	new->a = 8;
	224	old = _rcu_publish_content(&test_rcu_pointer, new);
	225	rcu_copy_mutex_unlock();
	226	/* can be done after unlock */
	227	if (old)
	228	old->a = 0;
	229	test_array_free(old);
	230	nr_writes++;
59d5a406	231	if (unlikely(!test_duration_write()))
061159a0	232	break;
59d5a406	233	if (unlikely(wdelay))
061159a0 MD	234	usleep(wdelay);
	235	}
	236
4bad7d45	237	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
061159a0 MD	238	"writer", pthread_self(), (unsigned long)gettid());
	239	*count = nr_writes;
	240	return ((void*)2);
	241	}
	242
	243	void show_usage(int argc, char **argv)
	244	{
	245	printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
	246	#ifdef DEBUG_YIELD
	247	printf(" [-r] [-w] (yield reader and/or writer)");
	248	#endif
7685d963	249	printf(" [-d delay] (writer period (us))");
daddf5b0	250	printf(" [-c duration] (reader C.S. duration (in loops))");
4bad7d45	251	printf(" [-v] (verbose output)");
9e97e478	252	printf(" [-a cpu#] [-a cpu#]... (affinity)");
061159a0 MD	253	printf("\n");
	254	}
	255
9e97e478 MD	256	cpu_set_t affinity;
9e97e478 MD	257
061159a0 MD	258	int main(int argc, char **argv)
	259	{
	260	int err;
	261	pthread_t tid_reader, tid_writer;
	262	void *tret;
	263	unsigned long long count_reader, count_writer;
	264	unsigned long long tot_reads = 0, tot_writes = 0;
9e97e478 MD	265	int i, a;
9e97e478 MD	266	int use_affinity = 0;
061159a0 MD	267
	268	if (argc < 4) {
	269	show_usage(argc, argv);
	270	return -1;
	271	}
	272
	273	err = sscanf(argv[1], "%u", &nr_readers);
	274	if (err != 1) {
	275	show_usage(argc, argv);
	276	return -1;
	277	}
	278
	279	err = sscanf(argv[2], "%u", &nr_writers);
	280	if (err != 1) {
	281	show_usage(argc, argv);
	282	return -1;
	283	}
	284
	285	err = sscanf(argv[3], "%lu", &duration);
	286	if (err != 1) {
	287	show_usage(argc, argv);
	288	return -1;
	289	}
	290
9e97e478 MD	291	CPU_ZERO(&affinity);
9e97e478 MD	292
061159a0 MD	293	for (i = 4; i < argc; i++) {
	294	if (argv[i][0] != '-')
	295	continue;
	296	switch (argv[i][1]) {
	297	#ifdef DEBUG_YIELD
	298	case 'r':
	299	yield_active \|= YIELD_READ;
	300	break;
	301	case 'w':
	302	yield_active \|= YIELD_WRITE;
	303	break;
	304	#endif
9e97e478 MD	305	case 'a':
	306	if (argc < i + 2) {
	307	show_usage(argc, argv);
	308	return -1;
	309	}
	310	a = atoi(argv[++i]);
	311	CPU_SET(a, &affinity);
	312	use_affinity = 1;
4bad7d45	313	printf_verbose("Adding CPU %d affinity\n", a);
9e97e478	314	break;
8b632bab MD	315	case 'c':
	316	if (argc < i + 2) {
	317	show_usage(argc, argv);
	318	return -1;
	319	}
	320	rduration = atoi(argv[++i]);
	321	break;
061159a0 MD	322	case 'd':
	323	if (argc < i + 2) {
	324	show_usage(argc, argv);
	325	return -1;
	326	}
	327	wdelay = atoi(argv[++i]);
	328	break;
4bad7d45 MD	329	case 'v':
	330	verbose_mode = 1;
	331	break;
061159a0 MD	332	}
	333	}
	334
4bad7d45	335	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
061159a0	336	duration, nr_readers, nr_writers);
4bad7d45 MD	337	printf_verbose("Writer delay : %u us.\n", wdelay);
	338	printf_verbose("Reader duration : %lu loops.\n", rduration);
	339	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
061159a0 MD	340	"main", pthread_self(), (unsigned long)gettid());
061159a0 MD	341
9e97e478 MD	342	if (use_affinity
	343	&& sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
	344	perror("sched_setaffinity");
	345	exit(-1);
	346	}
	347
061159a0 MD	348	test_array = malloc(sizeof(test_array) ARRAY_SIZE);
	349	tid_reader = malloc(sizeof(tid_reader) nr_readers);
	350	tid_writer = malloc(sizeof(tid_writer) nr_writers);
	351	count_reader = malloc(sizeof(count_reader) nr_readers);
	352	count_writer = malloc(sizeof(count_writer) nr_writers);
	353
	354	for (i = 0; i < nr_readers; i++) {
	355	err = pthread_create(&tid_reader[i], NULL, thr_reader,
	356	&count_reader[i]);
	357	if (err != 0)
	358	exit(1);
	359	}
	360	for (i = 0; i < nr_writers; i++) {
	361	err = pthread_create(&tid_writer[i], NULL, thr_writer,
	362	&count_writer[i]);
	363	if (err != 0)
	364	exit(1);
	365	}
	366
7685d963	367	smp_mb();
061159a0	368
78efb485 MD	369	test_go = 1;
	370
	371	sleep(duration);
	372
	373	test_stop = 1;
	374
061159a0 MD	375	for (i = 0; i < nr_readers; i++) {
	376	err = pthread_join(tid_reader[i], &tret);
	377	if (err != 0)
	378	exit(1);
	379	tot_reads += count_reader[i];
	380	}
	381	for (i = 0; i < nr_writers; i++) {
	382	err = pthread_join(tid_writer[i], &tret);
	383	if (err != 0)
	384	exit(1);
	385	tot_writes += count_writer[i];
	386	}
	387
4bad7d45	388	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
061159a0	389	tot_writes);
cda3c71d MD	390	printf("SUMMARY %-15s testdur %4lu nr_readers %3u rdur %6lu "
	391	"nr_writers %3u "
	392	"wdelay %4u nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
4bad7d45 MD	393	argv[0], duration, nr_readers, rduration,
	394	nr_writers, wdelay, tot_reads, tot_writes,
	395	tot_reads + tot_writes);
061159a0 MD	396	test_array_free(test_rcu_pointer);
	397	free(test_array);
	398	free(tid_reader);
	399	free(tid_writer);
	400	free(count_reader);
	401	free(count_writer);
	402	return 0;
	403	}