[urcu.git] / tests / test_urcu_assign.c

/*
 * test_urcu_assign.c
 *
 * Userspace RCU library - test program
 *
 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * 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 <sched.h>
#include <errno.h>

#include <urcu/arch.h>

#ifdef __linux__
#include <syscall.h>
#endif

/* 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;

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

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

#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)
	{
	}
	cmm_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)
	{
	}
	cmm_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);
		if (unlikely(wduration))
			loop_sleep(wduration);
		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(" [-e duration] (writer 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 'e':
			if (argc < i + 2) {
				show_usage(argc, 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("Reader duration : %lu loops.\n", rduration);
	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
			"main", pthread_self(), (unsigned long)gettid());

	test_array = calloc(1, 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);
	}

	cmm_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 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);
	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@efficios.com>
	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 <sched.h>
	35	#include <errno.h>
	36
	37	#include <urcu/arch.h>
	38
	39	#ifdef __linux__
	40	#include <syscall.h>
	41	#endif
	42
	43	/* hardcoded number of CPUs */
	44	#define NR_CPUS 16384
	45
	46	#if defined(_syscall0)
	47	_syscall0(pid_t, gettid)
	48	#elif defined(__NR_gettid)
	49	static inline pid_t gettid(void)
	50	{
	51	return syscall(__NR_gettid);
	52	}
	53	#else
	54	#warning "use pid as tid"
	55	static inline pid_t gettid(void)
	56	{
	57	return getpid();
	58	}
	59	#endif
	60
	61	#ifndef DYNAMIC_LINK_TEST
	62	#define _LGPL_SOURCE
	63	#else
	64	#define debug_yield_read()
	65	#endif
	66	#include <urcu.h>
	67
	68	struct test_array {
	69	int a;
	70	};
	71
	72	static volatile int test_go, test_stop;
	73
	74	static unsigned long wdelay;
	75
	76	static struct test_array *test_rcu_pointer;
	77
	78	static unsigned long duration;
	79
	80	/* read-side C.S. duration, in loops */
	81	static unsigned long rduration;
	82
	83	/* write-side C.S. duration, in loops */
	84	static unsigned long wduration;
	85
	86	static inline void loop_sleep(unsigned long l)
	87	{
	88	while(l-- != 0)
	89	caa_cpu_relax();
	90	}
	91
	92	static int verbose_mode;
	93
	94	#define printf_verbose(fmt, args...) \
	95	do { \
	96	if (verbose_mode) \
	97	printf(fmt, args); \
	98	} while (0)
	99
	100	static unsigned int cpu_affinities[NR_CPUS];
	101	static unsigned int next_aff = 0;
	102	static int use_affinity = 0;
	103
	104	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	105
	106	#ifndef HAVE_CPU_SET_T
	107	typedef unsigned long cpu_set_t;
	108	# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
	109	# define CPU_SET(cpu, cpuset) do { *(cpuset) \|= (1UL << (cpu)); } while(0)
	110	#endif
	111
	112	static void set_affinity(void)
	113	{
	114	cpu_set_t mask;
	115	int cpu;
	116	int ret;
	117
	118	if (!use_affinity)
	119	return;
	120
	121	#if HAVE_SCHED_SETAFFINITY
	122	ret = pthread_mutex_lock(&affinity_mutex);
	123	if (ret) {
	124	perror("Error in pthread mutex lock");
	125	exit(-1);
	126	}
	127	cpu = cpu_affinities[next_aff++];
	128	ret = pthread_mutex_unlock(&affinity_mutex);
	129	if (ret) {
	130	perror("Error in pthread mutex unlock");
	131	exit(-1);
	132	}
	133
	134	CPU_ZERO(&mask);
	135	CPU_SET(cpu, &mask);
	136	#if SCHED_SETAFFINITY_ARGS == 2
	137	sched_setaffinity(0, &mask);
	138	#else
	139	sched_setaffinity(0, sizeof(mask), &mask);
	140	#endif
	141	#endif /* HAVE_SCHED_SETAFFINITY */
	142	}
	143
	144	/*
	145	* returns 0 if test should end.
	146	*/
	147	static int test_duration_write(void)
	148	{
	149	return !test_stop;
	150	}
	151
	152	static int test_duration_read(void)
	153	{
	154	return !test_stop;
	155	}
	156
	157	static unsigned long long __thread nr_writes;
	158	static unsigned long long __thread nr_reads;
	159
	160	static unsigned int nr_readers;
	161	static unsigned int nr_writers;
	162
	163	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	164
	165	void rcu_copy_mutex_lock(void)
	166	{
	167	int ret;
	168	ret = pthread_mutex_lock(&rcu_copy_mutex);
	169	if (ret) {
	170	perror("Error in pthread mutex lock");
	171	exit(-1);
	172	}
	173	}
	174
	175	void rcu_copy_mutex_unlock(void)
	176	{
	177	int ret;
	178
	179	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	180	if (ret) {
	181	perror("Error in pthread mutex unlock");
	182	exit(-1);
	183	}
	184	}
	185
	186	/*
	187	* malloc/free are reusing memory areas too quickly, which does not let us
	188	* test races appropriately. Use a large circular array for allocations.
	189	* ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
	190	*/
	191	#define ARRAY_SIZE (1048576 * nr_writers)
	192	#define ARRAY_POISON 0xDEADBEEF
	193	static int array_index;
	194	static struct test_array *test_array;
	195
	196	static struct test_array *test_array_alloc(void)
	197	{
	198	struct test_array *ret;
	199	int index;
	200
	201	rcu_copy_mutex_lock();
	202	index = array_index % ARRAY_SIZE;
	203	assert(test_array[index].a == ARRAY_POISON \|\|
	204	test_array[index].a == 0);
	205	ret = &test_array[index];
	206	array_index++;
	207	if (array_index == ARRAY_SIZE)
	208	array_index = 0;
	209	rcu_copy_mutex_unlock();
	210	return ret;
	211	}
	212
	213	static void test_array_free(struct test_array *ptr)
	214	{
	215	if (!ptr)
	216	return;
	217	rcu_copy_mutex_lock();
	218	ptr->a = ARRAY_POISON;
	219	rcu_copy_mutex_unlock();
	220	}
	221
	222	void thr_reader(void _count)
	223	{
	224	unsigned long long *count = _count;
	225	struct test_array *local_ptr;
	226
	227	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	228	"reader", pthread_self(), (unsigned long)gettid());
	229
	230	set_affinity();
	231
	232	rcu_register_thread();
	233
	234	while (!test_go)
	235	{
	236	}
	237	cmm_smp_mb();
	238
	239	for (;;) {
	240	rcu_read_lock();
	241	local_ptr = rcu_dereference(test_rcu_pointer);
	242	debug_yield_read();
	243	if (local_ptr)
	244	assert(local_ptr->a == 8);
	245	if (unlikely(rduration))
	246	loop_sleep(rduration);
	247	rcu_read_unlock();
	248	nr_reads++;
	249	if (unlikely(!test_duration_read()))
	250	break;
	251	}
	252
	253	rcu_unregister_thread();
	254
	255	*count = nr_reads;
	256	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
	257	"reader", pthread_self(), (unsigned long)gettid());
	258	return ((void*)1);
	259
	260	}
	261
	262	void thr_writer(void _count)
	263	{
	264	unsigned long long *count = _count;
	265	struct test_array new, old;
	266
	267	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	268	"writer", pthread_self(), (unsigned long)gettid());
	269
	270	set_affinity();
	271
	272	while (!test_go)
	273	{
	274	}
	275	cmm_smp_mb();
	276
	277	for (;;) {
	278	new = test_array_alloc();
	279	new->a = 8;
	280	rcu_copy_mutex_lock();
	281	old = test_rcu_pointer;
	282	rcu_assign_pointer(test_rcu_pointer, new);
	283	if (unlikely(wduration))
	284	loop_sleep(wduration);
	285	rcu_copy_mutex_unlock();
	286	synchronize_rcu();
	287	if (old)
	288	old->a = 0;
	289	test_array_free(old);
	290	nr_writes++;
	291	if (unlikely(!test_duration_write()))
	292	break;
	293	if (unlikely(wdelay))
	294	loop_sleep(wdelay);
	295	}
	296
	297	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
	298	"writer", pthread_self(), (unsigned long)gettid());
	299	*count = nr_writes;
	300	return ((void*)2);
	301	}
	302
	303	void show_usage(int argc, char **argv)
	304	{
	305	printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
	306	#ifdef DEBUG_YIELD
	307	printf(" [-r] [-w] (yield reader and/or writer)");
	308	#endif
	309	printf(" [-d delay] (writer period (us))");
	310	printf(" [-c duration] (reader C.S. duration (in loops))");
	311	printf(" [-e duration] (writer C.S. duration (in loops))");
	312	printf(" [-v] (verbose output)");
	313	printf(" [-a cpu#] [-a cpu#]... (affinity)");
	314	printf("\n");
	315	}
	316
	317	int main(int argc, char **argv)
	318	{
	319	int err;
	320	pthread_t tid_reader, tid_writer;
	321	void *tret;
	322	unsigned long long count_reader, count_writer;
	323	unsigned long long tot_reads = 0, tot_writes = 0;
	324	int i, a;
	325
	326	if (argc < 4) {
	327	show_usage(argc, argv);
	328	return -1;
	329	}
	330
	331	err = sscanf(argv[1], "%u", &nr_readers);
	332	if (err != 1) {
	333	show_usage(argc, argv);
	334	return -1;
	335	}
	336
	337	err = sscanf(argv[2], "%u", &nr_writers);
	338	if (err != 1) {
	339	show_usage(argc, argv);
	340	return -1;
	341	}
	342
	343	err = sscanf(argv[3], "%lu", &duration);
	344	if (err != 1) {
	345	show_usage(argc, argv);
	346	return -1;
	347	}
	348
	349	for (i = 4; i < argc; i++) {
	350	if (argv[i][0] != '-')
	351	continue;
	352	switch (argv[i][1]) {
	353	#ifdef DEBUG_YIELD
	354	case 'r':
	355	yield_active \|= YIELD_READ;
	356	break;
	357	case 'w':
	358	yield_active \|= YIELD_WRITE;
	359	break;
	360	#endif
	361	case 'a':
	362	if (argc < i + 2) {
	363	show_usage(argc, argv);
	364	return -1;
	365	}
	366	a = atoi(argv[++i]);
	367	cpu_affinities[next_aff++] = a;
	368	use_affinity = 1;
	369	printf_verbose("Adding CPU %d affinity\n", a);
	370	break;
	371	case 'c':
	372	if (argc < i + 2) {
	373	show_usage(argc, argv);
	374	return -1;
	375	}
	376	rduration = atol(argv[++i]);
	377	break;
	378	case 'd':
	379	if (argc < i + 2) {
	380	show_usage(argc, argv);
	381	return -1;
	382	}
	383	wdelay = atol(argv[++i]);
	384	break;
	385	case 'e':
	386	if (argc < i + 2) {
	387	show_usage(argc, argv);
	388	return -1;
	389	}
	390	wduration = atol(argv[++i]);
	391	break;
	392	case 'v':
	393	verbose_mode = 1;
	394	break;
	395	}
	396	}
	397
	398	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
	399	duration, nr_readers, nr_writers);
	400	printf_verbose("Writer delay : %lu loops.\n", wdelay);
	401	printf_verbose("Reader duration : %lu loops.\n", rduration);
	402	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
	403	"main", pthread_self(), (unsigned long)gettid());
	404
	405	test_array = calloc(1, sizeof(test_array) ARRAY_SIZE);
	406	tid_reader = malloc(sizeof(tid_reader) nr_readers);
	407	tid_writer = malloc(sizeof(tid_writer) nr_writers);
	408	count_reader = malloc(sizeof(count_reader) nr_readers);
	409	count_writer = malloc(sizeof(count_writer) nr_writers);
	410
	411	next_aff = 0;
	412
	413	for (i = 0; i < nr_readers; i++) {
	414	err = pthread_create(&tid_reader[i], NULL, thr_reader,
	415	&count_reader[i]);
	416	if (err != 0)
	417	exit(1);
	418	}
	419	for (i = 0; i < nr_writers; i++) {
	420	err = pthread_create(&tid_writer[i], NULL, thr_writer,
	421	&count_writer[i]);
	422	if (err != 0)
	423	exit(1);
	424	}
	425
	426	cmm_smp_mb();
	427
	428	test_go = 1;
	429
	430	sleep(duration);
	431
	432	test_stop = 1;
	433
	434	for (i = 0; i < nr_readers; i++) {
	435	err = pthread_join(tid_reader[i], &tret);
	436	if (err != 0)
	437	exit(1);
	438	tot_reads += count_reader[i];
	439	}
	440	for (i = 0; i < nr_writers; i++) {
	441	err = pthread_join(tid_writer[i], &tret);
	442	if (err != 0)
	443	exit(1);
	444	tot_writes += count_writer[i];
	445	}
	446
	447	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
	448	tot_writes);
	449	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
	450	"nr_writers %3u "
	451	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
	452	argv[0], duration, nr_readers, rduration, wduration,
	453	nr_writers, wdelay, tot_reads, tot_writes,
	454	tot_reads + tot_writes);
	455	test_array_free(test_rcu_pointer);
	456	free(test_array);
	457	free(tid_reader);
	458	free(tid_writer);
	459	free(count_reader);
	460	free(count_writer);
	461	return 0;
	462	}