[userspace-rcu.git] / tests / test_qsbr.c

/*
 * test_urcu.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 <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-qsbr.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)
		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++;
		/* QS each 1024 reads */
		if (unlikely((nr_reads & ((1 << 10) - 1)) == 0))
			rcu_quiescent_state();
		if (unlikely(!test_duration_read()))
			break;
	}

	rcu_unregister_thread();

	/* test extra thread registration */
	rcu_register_thread();
	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;
		old = rcu_xchg_pointer(&test_rcu_pointer, new);
		if (unlikely(wduration))
			loop_sleep(wduration);
		synchronize_rcu();
		/* 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))
			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 = 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 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
061159a0 MD	1	/*
	2	* test_urcu.c
	3	*
	4	* Userspace RCU library - test program
	5	*
6982d6d7	6	* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
061159a0 MD	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
d8540fc5	24	#include "../config.h"
061159a0 MD	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>
9e97e478	35	#include <sched.h>
94b343fd	36	#include <errno.h>
061159a0	37
ec4e58a3	38	#include <urcu/arch.h>
7685d963	39
2a7ac59d MD	40	/* hardcoded number of CPUs */
	41	#define NR_CPUS 16384
	42
061159a0 MD	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
7ac06cef	58	#ifndef DYNAMIC_LINK_TEST
061159a0	59	#define _LGPL_SOURCE
7ac06cef MD	60	#else
	61	#define debug_yield_read()
	62	#endif
ec4e58a3	63	#include "urcu-qsbr.h"
061159a0 MD	64
	65	struct test_array {
	66	int a;
	67	};
	68
78efb485	69	static volatile int test_go, test_stop;
061159a0	70
9e31d0f0	71	static unsigned long wdelay;
061159a0 MD	72
	73	static struct test_array *test_rcu_pointer;
	74
	75	static unsigned long duration;
061159a0	76
daddf5b0	77	/* read-side C.S. duration, in loops */
8b632bab MD	78	static unsigned long rduration;
8b632bab MD	79
31b598e0 MD	80	/* write-side C.S. duration, in loops */
	81	static unsigned long wduration;
	82
daddf5b0 MD	83	static inline void loop_sleep(unsigned long l)
	84	{
	85	while(l-- != 0)
	86	cpu_relax();
	87	}
	88
4bad7d45 MD	89	static int verbose_mode;
	90
	91	#define printf_verbose(fmt, args...) \
	92	do { \
	93	if (verbose_mode) \
	94	printf(fmt, args); \
	95	} while (0)
	96
2a7ac59d MD	97	static unsigned int cpu_affinities[NR_CPUS];
	98	static unsigned int next_aff = 0;
	99	static int use_affinity = 0;
	100
6af882ba MD	101	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
6af882ba MD	102
d8540fc5 PA	103	#ifndef HAVE_CPU_SET_T
	104	typedef unsigned long cpu_set_t;
	105	# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
	106	# define CPU_SET(cpu, cpuset) do { *(cpuset) \|= (1UL << (cpu)); } while(0)
	107	#endif
	108
2a7ac59d MD	109	static void set_affinity(void)
	110	{
	111	cpu_set_t mask;
	112	int cpu;
6af882ba	113	int ret;
2a7ac59d MD	114
	115	if (!use_affinity)
	116	return;
	117
d8540fc5	118	#if HAVE_SCHED_SETAFFINITY
6af882ba MD	119	ret = pthread_mutex_lock(&affinity_mutex);
	120	if (ret) {
	121	perror("Error in pthread mutex lock");
	122	exit(-1);
	123	}
2a7ac59d	124	cpu = cpu_affinities[next_aff++];
6af882ba MD	125	ret = pthread_mutex_unlock(&affinity_mutex);
	126	if (ret) {
	127	perror("Error in pthread mutex unlock");
	128	exit(-1);
	129	}
2a7ac59d MD	130	CPU_ZERO(&mask);
2a7ac59d MD	131	CPU_SET(cpu, &mask);
d8540fc5 PA	132	#if SCHED_SETAFFINITY_ARGS == 2
	133	sched_setaffinity(0, &mask);
	134	#else
2a7ac59d	135	sched_setaffinity(0, sizeof(mask), &mask);
d8540fc5 PA	136	#endif
d8540fc5 PA	137	#endif /* HAVE_SCHED_SETAFFINITY */
2a7ac59d MD	138	}
2a7ac59d MD	139
061159a0 MD	140	/*
	141	* returns 0 if test should end.
	142	*/
	143	static int test_duration_write(void)
	144	{
78efb485	145	return !test_stop;
061159a0 MD	146	}
	147
	148	static int test_duration_read(void)
	149	{
78efb485	150	return !test_stop;
061159a0 MD	151	}
	152
	153	static unsigned long long __thread nr_writes;
	154	static unsigned long long __thread nr_reads;
	155
	156	static unsigned int nr_readers;
	157	static unsigned int nr_writers;
	158
	159	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	160
	161	void rcu_copy_mutex_lock(void)
	162	{
	163	int ret;
	164	ret = pthread_mutex_lock(&rcu_copy_mutex);
	165	if (ret) {
	166	perror("Error in pthread mutex lock");
	167	exit(-1);
	168	}
	169	}
	170
	171	void rcu_copy_mutex_unlock(void)
	172	{
	173	int ret;
	174
	175	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	176	if (ret) {
	177	perror("Error in pthread mutex unlock");
	178	exit(-1);
	179	}
	180	}
	181
	182	/*
	183	* malloc/free are reusing memory areas too quickly, which does not let us
	184	* test races appropriately. Use a large circular array for allocations.
	185	* ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
	186	*/
	187	#define ARRAY_SIZE (1048576 * nr_writers)
	188	#define ARRAY_POISON 0xDEADBEEF
	189	static int array_index;
	190	static struct test_array *test_array;
	191
	192	static struct test_array *test_array_alloc(void)
	193	{
	194	struct test_array *ret;
	195	int index;
	196
	197	rcu_copy_mutex_lock();
	198	index = array_index % ARRAY_SIZE;
	199	assert(test_array[index].a == ARRAY_POISON \|\|
	200	test_array[index].a == 0);
	201	ret = &test_array[index];
	202	array_index++;
	203	if (array_index == ARRAY_SIZE)
	204	array_index = 0;
	205	rcu_copy_mutex_unlock();
	206	return ret;
	207	}
	208
	209	static void test_array_free(struct test_array *ptr)
	210	{
	211	if (!ptr)
	212	return;
	213	rcu_copy_mutex_lock();
	214	ptr->a = ARRAY_POISON;
215	rcu_copy_mutex_unlock();
216	}
217
218	void thr_reader(void _count)
219	{
220	unsigned long long *count = _count;
221	struct test_array *local_ptr;
222
4bad7d45	223	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
061159a0 MD	224	"reader", pthread_self(), (unsigned long)gettid());
061159a0 MD	225
2a7ac59d MD	226	set_affinity();
2a7ac59d MD	227
061159a0 MD	228	rcu_register_thread();
	229
	230	while (!test_go)
	231	{
	232	}
7685d963	233	smp_mb();
061159a0 MD	234
061159a0 MD	235	for (;;) {
7ac06cef MD	236	rcu_read_lock();
7ac06cef MD	237	local_ptr = rcu_dereference(test_rcu_pointer);
061159a0 MD	238	debug_yield_read();
	239	if (local_ptr)
	240	assert(local_ptr->a == 8);
8b632bab	241	if (unlikely(rduration))
daddf5b0	242	loop_sleep(rduration);
7ac06cef	243	rcu_read_unlock();
061159a0	244	nr_reads++;
78efb485	245	/* QS each 1024 reads */
59d5a406	246	if (unlikely((nr_reads & ((1 << 10) - 1)) == 0))
7ac06cef	247	rcu_quiescent_state();
59d5a406	248	if (unlikely(!test_duration_read()))
061159a0 MD	249	break;
	250	}
	251
	252	rcu_unregister_thread();
	253
2b514ae2 MD	254	/* test extra thread registration */
	255	rcu_register_thread();
	256	rcu_unregister_thread();
	257
061159a0	258	*count = nr_reads;
4bad7d45	259	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
061159a0 MD	260	"reader", pthread_self(), (unsigned long)gettid());
	261	return ((void*)1);
	262
	263	}
	264
	265	void thr_writer(void _count)
	266	{
	267	unsigned long long *count = _count;
	268	struct test_array new, old;
	269
4bad7d45	270	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
061159a0 MD	271	"writer", pthread_self(), (unsigned long)gettid());
061159a0 MD	272
2a7ac59d MD	273	set_affinity();
2a7ac59d MD	274
061159a0 MD	275	while (!test_go)
	276	{
	277	}
7685d963	278	smp_mb();
061159a0 MD	279
	280	for (;;) {
	281	new = test_array_alloc();
061159a0	282	new->a = 8;
d2835e6f	283	old = rcu_xchg_pointer(&test_rcu_pointer, new);
31b598e0 MD	284	if (unlikely(wduration))
31b598e0 MD	285	loop_sleep(wduration);
d2835e6f	286	synchronize_rcu();
061159a0 MD	287	/* can be done after unlock */
	288	if (old)
	289	old->a = 0;
	290	test_array_free(old);
	291	nr_writes++;
59d5a406	292	if (unlikely(!test_duration_write()))
061159a0	293	break;
59d5a406	294	if (unlikely(wdelay))
9e31d0f0	295	loop_sleep(wdelay);
061159a0 MD	296	}
061159a0 MD	297
4bad7d45	298	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
061159a0 MD	299	"writer", pthread_self(), (unsigned long)gettid());
	300	*count = nr_writes;
	301	return ((void*)2);
	302	}
	303
	304	void show_usage(int argc, char **argv)
	305	{
	306	printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
	307	#ifdef DEBUG_YIELD
	308	printf(" [-r] [-w] (yield reader and/or writer)");
	309	#endif
7685d963	310	printf(" [-d delay] (writer period (us))");
daddf5b0	311	printf(" [-c duration] (reader C.S. duration (in loops))");
31b598e0	312	printf(" [-e duration] (writer C.S. duration (in loops))");
4bad7d45	313	printf(" [-v] (verbose output)");
9e97e478	314	printf(" [-a cpu#] [-a cpu#]... (affinity)");
061159a0 MD	315	printf("\n");
	316	}
	317
	318	int main(int argc, char **argv)
	319	{
	320	int err;
	321	pthread_t tid_reader, tid_writer;
	322	void *tret;
	323	unsigned long long count_reader, count_writer;
	324	unsigned long long tot_reads = 0, tot_writes = 0;
9e97e478	325	int i, a;
061159a0 MD	326
	327	if (argc < 4) {
	328	show_usage(argc, argv);
	329	return -1;
	330	}
	331
	332	err = sscanf(argv[1], "%u", &nr_readers);
	333	if (err != 1) {
	334	show_usage(argc, argv);
	335	return -1;
	336	}
	337
	338	err = sscanf(argv[2], "%u", &nr_writers);
	339	if (err != 1) {
	340	show_usage(argc, argv);
	341	return -1;
	342	}
	343
	344	err = sscanf(argv[3], "%lu", &duration);
	345	if (err != 1) {
	346	show_usage(argc, argv);
	347	return -1;
	348	}
	349
	350	for (i = 4; i < argc; i++) {
	351	if (argv[i][0] != '-')
	352	continue;
	353	switch (argv[i][1]) {
	354	#ifdef DEBUG_YIELD
	355	case 'r':
	356	yield_active \|= YIELD_READ;
	357	break;
	358	case 'w':
	359	yield_active \|= YIELD_WRITE;
	360	break;
	361	#endif
9e97e478 MD	362	case 'a':
	363	if (argc < i + 2) {
	364	show_usage(argc, argv);
	365	return -1;
	366	}
	367	a = atoi(argv[++i]);
2a7ac59d	368	cpu_affinities[next_aff++] = a;
9e97e478	369	use_affinity = 1;
4bad7d45	370	printf_verbose("Adding CPU %d affinity\n", a);
9e97e478	371	break;
8b632bab MD	372	case 'c':
	373	if (argc < i + 2) {
	374	show_usage(argc, argv);
	375	return -1;
	376	}
9e31d0f0	377	rduration = atol(argv[++i]);
8b632bab	378	break;
061159a0 MD	379	case 'd':
	380	if (argc < i + 2) {
	381	show_usage(argc, argv);
	382	return -1;
	383	}
9e31d0f0	384	wdelay = atol(argv[++i]);
061159a0	385	break;
31b598e0 MD	386	case 'e':
	387	if (argc < i + 2) {
	388	show_usage(argc, argv);
	389	return -1;
	390	}
	391	wduration = atol(argv[++i]);
	392	break;
4bad7d45 MD	393	case 'v':
	394	verbose_mode = 1;
	395	break;
061159a0 MD	396	}
	397	}
	398
4bad7d45	399	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
061159a0	400	duration, nr_readers, nr_writers);
9e31d0f0	401	printf_verbose("Writer delay : %lu loops.\n", wdelay);
4bad7d45 MD	402	printf_verbose("Reader duration : %lu loops.\n", rduration);
4bad7d45 MD	403	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
061159a0 MD	404	"main", pthread_self(), (unsigned long)gettid());
	405
	406	test_array = malloc(sizeof(test_array) ARRAY_SIZE);
	407	tid_reader = malloc(sizeof(tid_reader) nr_readers);
	408	tid_writer = malloc(sizeof(tid_writer) nr_writers);
	409	count_reader = malloc(sizeof(count_reader) nr_readers);
	410	count_writer = malloc(sizeof(count_writer) nr_writers);
	411
2a7ac59d MD	412	next_aff = 0;
2a7ac59d MD	413
061159a0 MD	414	for (i = 0; i < nr_readers; i++) {
	415	err = pthread_create(&tid_reader[i], NULL, thr_reader,
	416	&count_reader[i]);
	417	if (err != 0)
	418	exit(1);
	419	}
	420	for (i = 0; i < nr_writers; i++) {
	421	err = pthread_create(&tid_writer[i], NULL, thr_writer,
	422	&count_writer[i]);
	423	if (err != 0)
	424	exit(1);
	425	}
	426
7685d963	427	smp_mb();
061159a0	428
78efb485 MD	429	test_go = 1;
	430
	431	sleep(duration);
	432
	433	test_stop = 1;
	434
061159a0 MD	435	for (i = 0; i < nr_readers; i++) {
	436	err = pthread_join(tid_reader[i], &tret);
	437	if (err != 0)
	438	exit(1);
	439	tot_reads += count_reader[i];
	440	}
	441	for (i = 0; i < nr_writers; i++) {
	442	err = pthread_join(tid_writer[i], &tret);
	443	if (err != 0)
	444	exit(1);
	445	tot_writes += count_writer[i];
	446	}
	447
4bad7d45	448	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
061159a0	449	tot_writes);
a50a7b43	450	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
cda3c71d	451	"nr_writers %3u "
9e31d0f0	452	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
a50a7b43	453	argv[0], duration, nr_readers, rduration, wduration,
4bad7d45 MD	454	nr_writers, wdelay, tot_reads, tot_writes,
4bad7d45 MD	455	tot_reads + tot_writes);
061159a0 MD	456	test_array_free(test_rcu_pointer);
	457	free(test_array);
	458	free(tid_reader);
	459	free(tid_writer);
	460	free(count_reader);
	461	free(count_writer);
	462	return 0;
	463	}