[urcu.git] / tests / test_urcu_assign.c

/*
 * test_urcu_assign.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 "../config.h"
#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 <errno.h>

#include <urcu/arch.h>

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

#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

#ifndef DYNAMIC_LINK_TEST
#define _LGPL_SOURCE
#else
#define debug_yield_read()
#endif
#include <urcu.h>

struct test_array {
	int a;
};

static volatile int test_go, test_stop;

static unsigned long 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)

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;

#ifndef HAVE_CPU_SET_T
typedef unsigned long cpu_set_t;
# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
# define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
#endif

static void set_affinity(void)
{
	cpu_set_t mask;
	int cpu;
	int ret;

	if (!use_affinity)
		return;

#if 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);
#if SCHED_SETAFFINITY_ARGS == 2
	sched_setaffinity(0, &mask);
#else
	sched_setaffinity(0, sizeof(mask), &mask);
#endif
#endif /* HAVE_SCHED_SETAFFINITY */
}

/*
 * 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());

	set_affinity();

	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++;
		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());

	set_affinity();

	while (!test_go)
	{
	}
	smp_mb();

	for (;;) {
		new = test_array_alloc();
		new->a = 8;
		rcu_copy_mutex_lock();
		old = test_rcu_pointer;
		rcu_assign_pointer(test_rcu_pointer, new);
		rcu_copy_mutex_unlock();
		synchronize_rcu();
		if (old)
			old->a = 0;
		test_array_free(old);
		nr_writes++;
		if (unlikely(!test_duration_write()))
			break;
		if (unlikely(wdelay))
			loop_sleep(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");
}

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;

	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;
	}

	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_affinities[next_aff++] = a;
			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 = atol(argv[++i]);
			break;
		case 'd':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			wdelay = 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("Reader duration : %lu loops.\n", rduration);
	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
			"main", pthread_self(), (unsigned long)gettid());

	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);

	next_aff = 0;

	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 %-25s testdur %4lu nr_readers %3u rdur %6lu "
		"nr_writers %3u "
		"wdelay %6lu 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
	1	/*
	2	* test_urcu_assign.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
	23	#define _GNU_SOURCE
	24	#include "../config.h"
	25	#include <stdio.h>
	26	#include <pthread.h>
	27	#include <stdlib.h>
	28	#include <string.h>
	29	#include <sys/types.h>
	30	#include <sys/wait.h>
	31	#include <unistd.h>
	32	#include <stdio.h>
	33	#include <assert.h>
	34	#include <sys/syscall.h>
	35	#include <sched.h>
	36	#include <errno.h>
	37
	38	#include <urcu/arch.h>
	39
	40	/* hardcoded number of CPUs */
	41	#define NR_CPUS 16384
	42
	43	#if defined(_syscall0)
	44	_syscall0(pid_t, gettid)
	45	#elif defined(__NR_gettid)
	46	static inline pid_t gettid(void)
	47	{
	48	return syscall(__NR_gettid);
	49	}
	50	#else
	51	#warning "use pid as tid"
	52	static inline pid_t gettid(void)
	53	{
	54	return getpid();
	55	}
	56	#endif
	57
	58	#ifndef DYNAMIC_LINK_TEST
	59	#define _LGPL_SOURCE
	60	#else
	61	#define debug_yield_read()
	62	#endif
	63	#include <urcu.h>
	64
	65	struct test_array {
	66	int a;
	67	};
	68
	69	static volatile int test_go, test_stop;
	70
	71	static unsigned long wdelay;
	72
	73	static struct test_array *test_rcu_pointer;
	74
	75	static unsigned long duration;
	76
	77	/* read-side C.S. duration, in loops */
	78	static unsigned long rduration;
	79
	80	static inline void loop_sleep(unsigned long l)
	81	{
	82	while(l-- != 0)
	83	cpu_relax();
	84	}
	85
	86	static int verbose_mode;
	87
	88	#define printf_verbose(fmt, args...) \
	89	do { \
	90	if (verbose_mode) \
	91	printf(fmt, args); \
	92	} while (0)
	93
	94	static unsigned int cpu_affinities[NR_CPUS];
	95	static unsigned int next_aff = 0;
	96	static int use_affinity = 0;
	97
	98	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	99
	100	#ifndef HAVE_CPU_SET_T
	101	typedef unsigned long cpu_set_t;
	102	# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
	103	# define CPU_SET(cpu, cpuset) do { *(cpuset) \|= (1UL << (cpu)); } while(0)
	104	#endif
	105
	106	static void set_affinity(void)
	107	{
	108	cpu_set_t mask;
	109	int cpu;
	110	int ret;
	111
	112	if (!use_affinity)
	113	return;
	114
	115	#if HAVE_SCHED_SETAFFINITY
	116	ret = pthread_mutex_lock(&affinity_mutex);
	117	if (ret) {
	118	perror("Error in pthread mutex lock");
	119	exit(-1);
	120	}
	121	cpu = cpu_affinities[next_aff++];
	122	ret = pthread_mutex_unlock(&affinity_mutex);
	123	if (ret) {
	124	perror("Error in pthread mutex unlock");
	125	exit(-1);
	126	}
	127
	128	CPU_ZERO(&mask);
	129	CPU_SET(cpu, &mask);
	130	#if SCHED_SETAFFINITY_ARGS == 2
	131	sched_setaffinity(0, &mask);
	132	#else
	133	sched_setaffinity(0, sizeof(mask), &mask);
	134	#endif
	135	#endif /* HAVE_SCHED_SETAFFINITY */
	136	}
	137
	138	/*
	139	* returns 0 if test should end.
	140	*/
	141	static int test_duration_write(void)
	142	{
	143	return !test_stop;
	144	}
	145
	146	static int test_duration_read(void)
	147	{
	148	return !test_stop;
	149	}
	150
	151	static unsigned long long __thread nr_writes;
	152	static unsigned long long __thread nr_reads;
	153
	154	static unsigned int nr_readers;
	155	static unsigned int nr_writers;
	156
	157	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	158
	159	void rcu_copy_mutex_lock(void)
	160	{
	161	int ret;
	162	ret = pthread_mutex_lock(&rcu_copy_mutex);
	163	if (ret) {
	164	perror("Error in pthread mutex lock");
	165	exit(-1);
	166	}
	167	}
	168
	169	void rcu_copy_mutex_unlock(void)
	170	{
	171	int ret;
	172
	173	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	174	if (ret) {
	175	perror("Error in pthread mutex unlock");
	176	exit(-1);
	177	}
	178	}
	179
	180	/*
	181	* malloc/free are reusing memory areas too quickly, which does not let us
	182	* test races appropriately. Use a large circular array for allocations.
	183	* ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
	184	*/
	185	#define ARRAY_SIZE (1048576 * nr_writers)
	186	#define ARRAY_POISON 0xDEADBEEF
	187	static int array_index;
	188	static struct test_array *test_array;
	189
	190	static struct test_array *test_array_alloc(void)
	191	{
	192	struct test_array *ret;
	193	int index;
	194
	195	rcu_copy_mutex_lock();
	196	index = array_index % ARRAY_SIZE;
	197	assert(test_array[index].a == ARRAY_POISON \|\|
	198	test_array[index].a == 0);
	199	ret = &test_array[index];
	200	array_index++;
	201	if (array_index == ARRAY_SIZE)
	202	array_index = 0;
	203	rcu_copy_mutex_unlock();
	204	return ret;
	205	}
	206
	207	static void test_array_free(struct test_array *ptr)
	208	{
	209	if (!ptr)
	210	return;
	211	rcu_copy_mutex_lock();
	212	ptr->a = ARRAY_POISON;
	213	rcu_copy_mutex_unlock();
	214	}
	215
	216	void thr_reader(void _count)
	217	{
	218	unsigned long long *count = _count;
	219	struct test_array *local_ptr;
	220
	221	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	222	"reader", pthread_self(), (unsigned long)gettid());
	223
	224	set_affinity();
	225
	226	rcu_register_thread();
	227
	228	while (!test_go)
	229	{
	230	}
	231	smp_mb();
	232
	233	for (;;) {
	234	rcu_read_lock();
	235	local_ptr = rcu_dereference(test_rcu_pointer);
	236	debug_yield_read();
	237	if (local_ptr)
	238	assert(local_ptr->a == 8);
	239	if (unlikely(rduration))
	240	loop_sleep(rduration);
	241	rcu_read_unlock();
	242	nr_reads++;
	243	if (unlikely(!test_duration_read()))
	244	break;
	245	}
	246
	247	rcu_unregister_thread();
	248
	249	*count = nr_reads;
	250	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
	251	"reader", pthread_self(), (unsigned long)gettid());
	252	return ((void*)1);
	253
	254	}
	255
	256	void thr_writer(void _count)
	257	{
	258	unsigned long long *count = _count;
	259	struct test_array new, old;
	260
	261	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	262	"writer", pthread_self(), (unsigned long)gettid());
	263
	264	set_affinity();
	265
	266	while (!test_go)
	267	{
	268	}
	269	smp_mb();
	270
	271	for (;;) {
	272	new = test_array_alloc();
	273	new->a = 8;
	274	rcu_copy_mutex_lock();
	275	old = test_rcu_pointer;
	276	rcu_assign_pointer(test_rcu_pointer, new);
	277	rcu_copy_mutex_unlock();
	278	synchronize_rcu();
	279	if (old)
	280	old->a = 0;
	281	test_array_free(old);
	282	nr_writes++;
	283	if (unlikely(!test_duration_write()))
	284	break;
	285	if (unlikely(wdelay))
	286	loop_sleep(wdelay);
	287	}
	288
	289	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
	290	"writer", pthread_self(), (unsigned long)gettid());
	291	*count = nr_writes;
	292	return ((void*)2);
	293	}
	294
	295	void show_usage(int argc, char **argv)
	296	{
	297	printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
	298	#ifdef DEBUG_YIELD
	299	printf(" [-r] [-w] (yield reader and/or writer)");
	300	#endif
	301	printf(" [-d delay] (writer period (us))");
	302	printf(" [-c duration] (reader C.S. duration (in loops))");
	303	printf(" [-v] (verbose output)");
	304	printf(" [-a cpu#] [-a cpu#]... (affinity)");
	305	printf("\n");
	306	}
	307
	308	int main(int argc, char **argv)
	309	{
	310	int err;
	311	pthread_t tid_reader, tid_writer;
	312	void *tret;
	313	unsigned long long count_reader, count_writer;
	314	unsigned long long tot_reads = 0, tot_writes = 0;
	315	int i, a;
	316
	317	if (argc < 4) {
	318	show_usage(argc, argv);
	319	return -1;
	320	}
	321
	322	err = sscanf(argv[1], "%u", &nr_readers);
	323	if (err != 1) {
	324	show_usage(argc, argv);
	325	return -1;
	326	}
	327
	328	err = sscanf(argv[2], "%u", &nr_writers);
	329	if (err != 1) {
	330	show_usage(argc, argv);
	331	return -1;
	332	}
	333
	334	err = sscanf(argv[3], "%lu", &duration);
	335	if (err != 1) {
	336	show_usage(argc, argv);
	337	return -1;
	338	}
	339
	340	for (i = 4; i < argc; i++) {
	341	if (argv[i][0] != '-')
	342	continue;
	343	switch (argv[i][1]) {
	344	#ifdef DEBUG_YIELD
	345	case 'r':
	346	yield_active \|= YIELD_READ;
	347	break;
	348	case 'w':
	349	yield_active \|= YIELD_WRITE;
	350	break;
	351	#endif
	352	case 'a':
	353	if (argc < i + 2) {
	354	show_usage(argc, argv);
	355	return -1;
	356	}
	357	a = atoi(argv[++i]);
	358	cpu_affinities[next_aff++] = a;
	359	use_affinity = 1;
	360	printf_verbose("Adding CPU %d affinity\n", a);
	361	break;
	362	case 'c':
	363	if (argc < i + 2) {
	364	show_usage(argc, argv);
	365	return -1;
	366	}
	367	rduration = atol(argv[++i]);
	368	break;
	369	case 'd':
	370	if (argc < i + 2) {
	371	show_usage(argc, argv);
	372	return -1;
	373	}
	374	wdelay = atol(argv[++i]);
	375	break;
	376	case 'v':
	377	verbose_mode = 1;
	378	break;
	379	}
	380	}
	381
	382	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
	383	duration, nr_readers, nr_writers);
	384	printf_verbose("Writer delay : %lu loops.\n", wdelay);
	385	printf_verbose("Reader duration : %lu loops.\n", rduration);
	386	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
	387	"main", pthread_self(), (unsigned long)gettid());
	388
	389	test_array = malloc(sizeof(test_array) ARRAY_SIZE);
	390	tid_reader = malloc(sizeof(tid_reader) nr_readers);
	391	tid_writer = malloc(sizeof(tid_writer) nr_writers);
	392	count_reader = malloc(sizeof(count_reader) nr_readers);
	393	count_writer = malloc(sizeof(count_writer) nr_writers);
	394
	395	next_aff = 0;
	396
	397	for (i = 0; i < nr_readers; i++) {
	398	err = pthread_create(&tid_reader[i], NULL, thr_reader,
	399	&count_reader[i]);
	400	if (err != 0)
	401	exit(1);
	402	}
	403	for (i = 0; i < nr_writers; i++) {
	404	err = pthread_create(&tid_writer[i], NULL, thr_writer,
	405	&count_writer[i]);
	406	if (err != 0)
	407	exit(1);
	408	}
	409
	410	smp_mb();
	411
	412	test_go = 1;
	413
	414	sleep(duration);
	415
	416	test_stop = 1;
	417
	418	for (i = 0; i < nr_readers; i++) {
	419	err = pthread_join(tid_reader[i], &tret);
	420	if (err != 0)
	421	exit(1);
	422	tot_reads += count_reader[i];
	423	}
	424	for (i = 0; i < nr_writers; i++) {
	425	err = pthread_join(tid_writer[i], &tret);
	426	if (err != 0)
	427	exit(1);
	428	tot_writes += count_writer[i];
	429	}
	430
	431	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
	432	tot_writes);
	433	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
	434	"nr_writers %3u "
	435	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
	436	argv[0], duration, nr_readers, rduration,
	437	nr_writers, wdelay, tot_reads, tot_writes,
	438	tot_reads + tot_writes);
	439	test_array_free(test_rcu_pointer);
	440	free(test_array);
	441	free(tid_reader);
	442	free(tid_writer);
	443	free(count_reader);
	444	free(count_writer);
	445	return 0;
	446	}