[urcu.git] / tests / test_urcu_wfcq.c

/*
 * test_urcu_wfcq.c
 *
 * Userspace RCU library - example RCU-based lock-free concurrent queue
 *
 * Copyright February 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 * Copyright February 2010 - Paolo Bonzini <pbonzini@redhat.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 <stdint.h>
#include <stdbool.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>
#include <urcu/tls-compat.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
#endif
#include <urcu.h>
#include <urcu/wfcqueue.h>

enum test_sync {
	TEST_SYNC_MUTEX = 0,
	TEST_SYNC_NONE,
};

static enum test_sync test_sync;

static volatile int test_go, test_stop;

static unsigned long rduration;

static unsigned long duration;

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

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

static int verbose_mode;

static int test_dequeue, test_splice;

#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)
{
#if HAVE_SCHED_SETAFFINITY
	cpu_set_t mask;
	int cpu, ret;
#endif /* HAVE_SCHED_SETAFFINITY */

	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_dequeue(void)
{
	return !test_stop;
}

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

static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);

static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);

static unsigned int nr_enqueuers;
static unsigned int nr_dequeuers;

static struct cds_wfcq_head __attribute__((aligned(CAA_CACHE_LINE_SIZE))) head;
static struct cds_wfcq_tail __attribute__((aligned(CAA_CACHE_LINE_SIZE))) tail;

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

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

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		struct cds_wfcq_node *node = malloc(sizeof(*node));
		if (!node)
			goto fail;
		cds_wfcq_node_init(node);
		cds_wfcq_enqueue(&head, &tail, node);
		URCU_TLS(nr_successful_enqueues)++;

		if (caa_unlikely(wdelay))
			loop_sleep(wdelay);
fail:
		URCU_TLS(nr_enqueues)++;
		if (caa_unlikely(!test_duration_enqueue()))
			break;
	}

	count[0] = URCU_TLS(nr_enqueues);
	count[1] = URCU_TLS(nr_successful_enqueues);
	printf_verbose("enqueuer thread_end, thread id : %lx, tid %lu, "
		       "enqueues %llu successful_enqueues %llu\n",
		       pthread_self(), (unsigned long)gettid(),
		       URCU_TLS(nr_enqueues), URCU_TLS(nr_successful_enqueues));
	return ((void*)1);

}

static void do_test_dequeue(enum test_sync sync)
{
	struct cds_wfcq_node *node;

	if (sync == TEST_SYNC_MUTEX)
		node = cds_wfcq_dequeue_blocking(&head, &tail);
	else
		node = __cds_wfcq_dequeue_blocking(&head, &tail);

	if (node) {
		free(node);
		URCU_TLS(nr_successful_dequeues)++;
	}
	URCU_TLS(nr_dequeues)++;
}

static void do_test_splice(enum test_sync sync)
{
	struct cds_wfcq_head tmp_head;
	struct cds_wfcq_tail tmp_tail;
	struct cds_wfcq_node *node, *n;

	cds_wfcq_init(&tmp_head, &tmp_tail);

	if (sync == TEST_SYNC_MUTEX)
		cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
			&head, &tail);
	else
		__cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
			&head, &tail);

	__cds_wfcq_for_each_blocking_safe(&tmp_head, &tmp_tail, node, n) {
		free(node);
		URCU_TLS(nr_successful_dequeues)++;
		URCU_TLS(nr_dequeues)++;
	}
}

static void *thr_dequeuer(void *_count)
{
	unsigned long long *count = _count;
	unsigned int counter;

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

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		if (test_dequeue && test_splice) {
			if (counter & 1)
				do_test_dequeue(test_sync);
			else
				do_test_splice(test_sync);
			counter++;
		} else {
			if (test_dequeue)
				do_test_dequeue(test_sync);
			else
				do_test_splice(test_sync);
		}
		if (caa_unlikely(!test_duration_dequeue()))
			break;
		if (caa_unlikely(rduration))
			loop_sleep(rduration);
	}

	printf_verbose("dequeuer thread_end, thread id : %lx, tid %lu, "
		       "dequeues %llu, successful_dequeues %llu\n",
		       pthread_self(), (unsigned long)gettid(),
		       URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues));
	count[0] = URCU_TLS(nr_dequeues);
	count[1] = URCU_TLS(nr_successful_dequeues);
	return ((void*)2);
}

static void test_end(unsigned long long *nr_dequeues)
{
	struct cds_wfcq_node *node;

	do {
		node = cds_wfcq_dequeue_blocking(&head, &tail);
		if (node) {
			free(node);
			(*nr_dequeues)++;
		}
	} while (node);
}

static void show_usage(int argc, char **argv)
{
	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s)", argv[0]);
	printf(" [-d delay] (enqueuer period (in loops))");
	printf(" [-c duration] (dequeuer period (in loops))");
	printf(" [-v] (verbose output)");
	printf(" [-a cpu#] [-a cpu#]... (affinity)");
	printf(" [-q] (test dequeue)");
	printf(" [-s] (test splice, enabled by default)");
	printf(" [-M] (use mutex external synchronization)");
	printf(" [-0] (use no external synchronization)");
	printf("      Note: default: mutex external synchronization used.");
	printf("\n");
}

int main(int argc, char **argv)
{
	int err;
	pthread_t *tid_enqueuer, *tid_dequeuer;
	void *tret;
	unsigned long long *count_enqueuer, *count_dequeuer;
	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	unsigned long long tot_successful_enqueues = 0,
			   tot_successful_dequeues = 0;
	unsigned long long end_dequeues = 0;
	int i, a;

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

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

	err = sscanf(argv[2], "%u", &nr_enqueuers);
	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]) {
		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;
		case 'q':
			test_dequeue = 1;
			break;
		case 's':
			test_splice = 1;
			break;
		case 'M':
			test_sync = TEST_SYNC_MUTEX;
			break;
		case '0':
			test_sync = TEST_SYNC_NONE;
			break;
		}
	}

	/* activate splice test by default */
	if (!test_dequeue && !test_splice)
		test_splice = 1;

	printf_verbose("running test for %lu seconds, %u enqueuers, "
		       "%u dequeuers.\n",
		       duration, nr_enqueuers, nr_dequeuers);
	if (test_dequeue)
		printf_verbose("dequeue test activated.\n");
	else
		printf_verbose("splice test activated.\n");
	if (test_sync == TEST_SYNC_MUTEX)
		printf_verbose("External sync: mutex.\n");
	else
		printf_verbose("External sync: none.\n");
	printf_verbose("Writer delay : %lu loops.\n", rduration);
	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
			"main", pthread_self(), (unsigned long)gettid());

	tid_enqueuer = malloc(sizeof(*tid_enqueuer) * nr_enqueuers);
	tid_dequeuer = malloc(sizeof(*tid_dequeuer) * nr_dequeuers);
	count_enqueuer = malloc(2 * sizeof(*count_enqueuer) * nr_enqueuers);
	count_dequeuer = malloc(2 * sizeof(*count_dequeuer) * nr_dequeuers);
	cds_wfcq_init(&head, &tail);

	next_aff = 0;

	for (i = 0; i < nr_enqueuers; i++) {
		err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
				     &count_enqueuer[2 * i]);
		if (err != 0)
			exit(1);
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
				     &count_dequeuer[2 * i]);
		if (err != 0)
			exit(1);
	}

	cmm_smp_mb();

	test_go = 1;

	for (i = 0; i < duration; i++) {
		sleep(1);
		if (verbose_mode)
			write (1, ".", 1);
	}

	test_stop = 1;

	for (i = 0; i < nr_enqueuers; i++) {
		err = pthread_join(tid_enqueuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_enqueues += count_enqueuer[2 * i];
		tot_successful_enqueues += count_enqueuer[2 * i + 1];
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_join(tid_dequeuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_dequeues += count_dequeuer[2 * i];
		tot_successful_dequeues += count_dequeuer[2 * i + 1];
	}
	
	test_end(&end_dequeues);

	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
		       tot_enqueues, tot_dequeues);
	printf_verbose("total number of successful enqueues : %llu, "
		       "successful dequeues %llu\n",
		       tot_successful_enqueues, tot_successful_dequeues);
	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
		"nr_dequeuers %3u "
		"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
		"successful enqueues %12llu successful dequeues %12llu "
		"end_dequeues %llu nr_ops %12llu\n",
		argv[0], duration, nr_enqueuers, wdelay,
		nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
		tot_successful_enqueues,
		tot_successful_dequeues, end_dequeues,
		tot_enqueues + tot_dequeues);
	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues)
		printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
		       "succ. dequeues + end dequeues %llu.\n",
		       tot_successful_enqueues,
		       tot_successful_dequeues + end_dequeues);

	free(count_enqueuer);
	free(count_dequeuer);
	free(tid_enqueuer);
	free(tid_dequeuer);
	return 0;
}
Commit	Line	Data
5e70d572 MD	1	/*
	2	* test_urcu_wfcq.c
	3	*
	4	* Userspace RCU library - example RCU-based lock-free concurrent queue
	5	*
	6	* Copyright February 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	* Copyright February 2010 - Paolo Bonzini <pbonzini@redhat.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	22	*/
	23
	24	#define _GNU_SOURCE
	25	#include "../config.h"
	26	#include <stdio.h>
	27	#include <pthread.h>
	28	#include <stdlib.h>
	29	#include <stdint.h>
	30	#include <stdbool.h>
	31	#include <string.h>
	32	#include <sys/types.h>
	33	#include <sys/wait.h>
	34	#include <unistd.h>
	35	#include <stdio.h>
	36	#include <assert.h>
	37	#include <sched.h>
	38	#include <errno.h>
	39
	40	#include <urcu/arch.h>
	41	#include <urcu/tls-compat.h>
	42
	43	#ifdef __linux__
	44	#include <syscall.h>
	45	#endif
	46
	47	/* hardcoded number of CPUs */
	48	#define NR_CPUS 16384
	49
	50	#if defined(_syscall0)
	51	_syscall0(pid_t, gettid)
	52	#elif defined(__NR_gettid)
	53	static inline pid_t gettid(void)
	54	{
	55	return syscall(__NR_gettid);
	56	}
	57	#else
	58	#warning "use pid as tid"
	59	static inline pid_t gettid(void)
	60	{
	61	return getpid();
	62	}
	63	#endif
	64
65	#ifndef DYNAMIC_LINK_TEST
66	#define _LGPL_SOURCE
67	#endif
68	#include <urcu.h>
69	#include <urcu/wfcqueue.h>
70
f5d36fed MD	71	enum test_sync {
	72	TEST_SYNC_MUTEX = 0,
	73	TEST_SYNC_NONE,
	74	};
	75
	76	static enum test_sync test_sync;
	77
5e70d572 MD	78	static volatile int test_go, test_stop;
	79
	80	static unsigned long rduration;
	81
	82	static unsigned long duration;
	83
	84	/* read-side C.S. duration, in loops */
	85	static unsigned long wdelay;
	86
ab0aacbe	87	static inline void loop_sleep(unsigned long loops)
5e70d572	88	{
ab0aacbe	89	while (loops-- != 0)
5e70d572 MD	90	caa_cpu_relax();
	91	}
	92
	93	static int verbose_mode;
	94
f5d36fed MD	95	static int test_dequeue, test_splice;
f5d36fed MD	96
5e70d572 MD	97	#define printf_verbose(fmt, args...) \
	98	do { \
	99	if (verbose_mode) \
f5d36fed	100	printf(fmt, ## args); \
5e70d572 MD	101	} while (0)
	102
	103	static unsigned int cpu_affinities[NR_CPUS];
	104	static unsigned int next_aff = 0;
	105	static int use_affinity = 0;
	106
	107	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	108
	109	#ifndef HAVE_CPU_SET_T
	110	typedef unsigned long cpu_set_t;
	111	# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
	112	# define CPU_SET(cpu, cpuset) do { *(cpuset) \|= (1UL << (cpu)); } while(0)
	113	#endif
	114
	115	static void set_affinity(void)
	116	{
95bc7fb9	117	#if HAVE_SCHED_SETAFFINITY
5e70d572	118	cpu_set_t mask;
95bc7fb9 MD	119	int cpu, ret;
95bc7fb9 MD	120	#endif /* HAVE_SCHED_SETAFFINITY */
5e70d572 MD	121
	122	if (!use_affinity)
	123	return;
	124
	125	#if HAVE_SCHED_SETAFFINITY
	126	ret = pthread_mutex_lock(&affinity_mutex);
	127	if (ret) {
	128	perror("Error in pthread mutex lock");
	129	exit(-1);
	130	}
	131	cpu = cpu_affinities[next_aff++];
	132	ret = pthread_mutex_unlock(&affinity_mutex);
	133	if (ret) {
	134	perror("Error in pthread mutex unlock");
	135	exit(-1);
	136	}
	137
	138	CPU_ZERO(&mask);
	139	CPU_SET(cpu, &mask);
	140	#if SCHED_SETAFFINITY_ARGS == 2
	141	sched_setaffinity(0, &mask);
	142	#else
	143	sched_setaffinity(0, sizeof(mask), &mask);
	144	#endif
	145	#endif /* HAVE_SCHED_SETAFFINITY */
	146	}
	147
	148	/*
	149	* returns 0 if test should end.
	150	*/
	151	static int test_duration_dequeue(void)
	152	{
	153	return !test_stop;
	154	}
	155
	156	static int test_duration_enqueue(void)
	157	{
	158	return !test_stop;
	159	}
	160
	161	static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
	162	static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);
	163
	164	static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
	165	static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);
	166
	167	static unsigned int nr_enqueuers;
	168	static unsigned int nr_dequeuers;
	169
	170	static struct cds_wfcq_head __attribute__((aligned(CAA_CACHE_LINE_SIZE))) head;
	171	static struct cds_wfcq_tail __attribute__((aligned(CAA_CACHE_LINE_SIZE))) tail;
	172
f5d36fed	173	static void thr_enqueuer(void _count)
5e70d572 MD	174	{
	175	unsigned long long *count = _count;
	176
	177	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	178	"enqueuer", pthread_self(), (unsigned long)gettid());
	179
	180	set_affinity();
	181
	182	while (!test_go)
	183	{
	184	}
	185	cmm_smp_mb();
	186
	187	for (;;) {
	188	struct cds_wfcq_node node = malloc(sizeof(node));
	189	if (!node)
	190	goto fail;
	191	cds_wfcq_node_init(node);
	192	cds_wfcq_enqueue(&head, &tail, node);
	193	URCU_TLS(nr_successful_enqueues)++;
	194
	195	if (caa_unlikely(wdelay))
	196	loop_sleep(wdelay);
	197	fail:
	198	URCU_TLS(nr_enqueues)++;
	199	if (caa_unlikely(!test_duration_enqueue()))
	200	break;
	201	}
	202
	203	count[0] = URCU_TLS(nr_enqueues);
	204	count[1] = URCU_TLS(nr_successful_enqueues);
	205	printf_verbose("enqueuer thread_end, thread id : %lx, tid %lu, "
	206	"enqueues %llu successful_enqueues %llu\n",
	207	pthread_self(), (unsigned long)gettid(),
	208	URCU_TLS(nr_enqueues), URCU_TLS(nr_successful_enqueues));
	209	return ((void*)1);
	210
	211	}
	212
f5d36fed MD	213	static void do_test_dequeue(enum test_sync sync)
	214	{
	215	struct cds_wfcq_node *node;
	216
	217	if (sync == TEST_SYNC_MUTEX)
	218	node = cds_wfcq_dequeue_blocking(&head, &tail);
	219	else
	220	node = __cds_wfcq_dequeue_blocking(&head, &tail);
	221
	222	if (node) {
	223	free(node);
	224	URCU_TLS(nr_successful_dequeues)++;
	225	}
	226	URCU_TLS(nr_dequeues)++;
	227	}
	228
	229	static void do_test_splice(enum test_sync sync)
	230	{
	231	struct cds_wfcq_head tmp_head;
	232	struct cds_wfcq_tail tmp_tail;
	233	struct cds_wfcq_node node, n;
	234
	235	cds_wfcq_init(&tmp_head, &tmp_tail);
	236
	237	if (sync == TEST_SYNC_MUTEX)
	238	cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
	239	&head, &tail);
	240	else
	241	__cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
	242	&head, &tail);
	243
	244	__cds_wfcq_for_each_blocking_safe(&tmp_head, &tmp_tail, node, n) {
	245	free(node);
	246	URCU_TLS(nr_successful_dequeues)++;
	247	URCU_TLS(nr_dequeues)++;
	248	}
	249	}
	250
	251	static void thr_dequeuer(void _count)
5e70d572 MD	252	{
5e70d572 MD	253	unsigned long long *count = _count;
f5d36fed	254	unsigned int counter;
5e70d572 MD	255
	256	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	257	"dequeuer", pthread_self(), (unsigned long)gettid());
	258
	259	set_affinity();
	260
	261	while (!test_go)
	262	{
	263	}
	264	cmm_smp_mb();
	265
	266	for (;;) {
f5d36fed MD	267	if (test_dequeue && test_splice) {
	268	if (counter & 1)
	269	do_test_dequeue(test_sync);
	270	else
	271	do_test_splice(test_sync);
	272	counter++;
	273	} else {
	274	if (test_dequeue)
	275	do_test_dequeue(test_sync);
	276	else
	277	do_test_splice(test_sync);
5e70d572	278	}
5e70d572 MD	279	if (caa_unlikely(!test_duration_dequeue()))
	280	break;
	281	if (caa_unlikely(rduration))
	282	loop_sleep(rduration);
	283	}
	284
	285	printf_verbose("dequeuer thread_end, thread id : %lx, tid %lu, "
	286	"dequeues %llu, successful_dequeues %llu\n",
	287	pthread_self(), (unsigned long)gettid(),
	288	URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues));
	289	count[0] = URCU_TLS(nr_dequeues);
	290	count[1] = URCU_TLS(nr_successful_dequeues);
	291	return ((void*)2);
	292	}
	293
f5d36fed	294	static void test_end(unsigned long long *nr_dequeues)
5e70d572 MD	295	{
	296	struct cds_wfcq_node *node;
	297
	298	do {
	299	node = cds_wfcq_dequeue_blocking(&head, &tail);
	300	if (node) {
	301	free(node);
	302	(*nr_dequeues)++;
	303	}
	304	} while (node);
	305	}
	306
f5d36fed	307	static void show_usage(int argc, char **argv)
5e70d572 MD	308	{
	309	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s)", argv[0]);
	310	printf(" [-d delay] (enqueuer period (in loops))");
	311	printf(" [-c duration] (dequeuer period (in loops))");
	312	printf(" [-v] (verbose output)");
	313	printf(" [-a cpu#] [-a cpu#]... (affinity)");
f5d36fed MD	314	printf(" [-q] (test dequeue)");
	315	printf(" [-s] (test splice, enabled by default)");
	316	printf(" [-M] (use mutex external synchronization)");
	317	printf(" [-0] (use no external synchronization)");
	318	printf(" Note: default: mutex external synchronization used.");
5e70d572 MD	319	printf("\n");
	320	}
	321
	322	int main(int argc, char **argv)
	323	{
	324	int err;
	325	pthread_t tid_enqueuer, tid_dequeuer;
	326	void *tret;
	327	unsigned long long count_enqueuer, count_dequeuer;
	328	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	329	unsigned long long tot_successful_enqueues = 0,
	330	tot_successful_dequeues = 0;
	331	unsigned long long end_dequeues = 0;
	332	int i, a;
	333
	334	if (argc < 4) {
	335	show_usage(argc, argv);
	336	return -1;
	337	}
	338
	339	err = sscanf(argv[1], "%u", &nr_dequeuers);
	340	if (err != 1) {
	341	show_usage(argc, argv);
	342	return -1;
	343	}
	344
	345	err = sscanf(argv[2], "%u", &nr_enqueuers);
	346	if (err != 1) {
	347	show_usage(argc, argv);
	348	return -1;
	349	}
	350
	351	err = sscanf(argv[3], "%lu", &duration);
	352	if (err != 1) {
	353	show_usage(argc, argv);
	354	return -1;
	355	}
	356
	357	for (i = 4; i < argc; i++) {
	358	if (argv[i][0] != '-')
	359	continue;
	360	switch (argv[i][1]) {
	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 'v':
386	verbose_mode = 1;
387	break;
f5d36fed MD	388	case 'q':
	389	test_dequeue = 1;
	390	break;
	391	case 's':
	392	test_splice = 1;
	393	break;
	394	case 'M':
	395	test_sync = TEST_SYNC_MUTEX;
	396	break;
	397	case '0':
	398	test_sync = TEST_SYNC_NONE;
	399	break;
5e70d572 MD	400	}
	401	}
	402
f5d36fed MD	403	/* activate splice test by default */
	404	if (!test_dequeue && !test_splice)
	405	test_splice = 1;
	406
5e70d572 MD	407	printf_verbose("running test for %lu seconds, %u enqueuers, "
	408	"%u dequeuers.\n",
	409	duration, nr_enqueuers, nr_dequeuers);
f5d36fed MD	410	if (test_dequeue)
	411	printf_verbose("dequeue test activated.\n");
	412	else
	413	printf_verbose("splice test activated.\n");
	414	if (test_sync == TEST_SYNC_MUTEX)
	415	printf_verbose("External sync: mutex.\n");
	416	else
	417	printf_verbose("External sync: none.\n");
5e70d572 MD	418	printf_verbose("Writer delay : %lu loops.\n", rduration);
	419	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	420	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
	421	"main", pthread_self(), (unsigned long)gettid());
	422
	423	tid_enqueuer = malloc(sizeof(tid_enqueuer) nr_enqueuers);
	424	tid_dequeuer = malloc(sizeof(tid_dequeuer) nr_dequeuers);
	425	count_enqueuer = malloc(2 * sizeof(count_enqueuer) nr_enqueuers);
	426	count_dequeuer = malloc(2 * sizeof(count_dequeuer) nr_dequeuers);
	427	cds_wfcq_init(&head, &tail);
	428
	429	next_aff = 0;
	430
	431	for (i = 0; i < nr_enqueuers; i++) {
	432	err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
	433	&count_enqueuer[2 * i]);
	434	if (err != 0)
	435	exit(1);
	436	}
	437	for (i = 0; i < nr_dequeuers; i++) {
	438	err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
	439	&count_dequeuer[2 * i]);
	440	if (err != 0)
	441	exit(1);
	442	}
	443
	444	cmm_smp_mb();
	445
	446	test_go = 1;
	447
	448	for (i = 0; i < duration; i++) {
	449	sleep(1);
	450	if (verbose_mode)
	451	write (1, ".", 1);
	452	}
	453
	454	test_stop = 1;
	455
	456	for (i = 0; i < nr_enqueuers; i++) {
	457	err = pthread_join(tid_enqueuer[i], &tret);
	458	if (err != 0)
	459	exit(1);
	460	tot_enqueues += count_enqueuer[2 * i];
	461	tot_successful_enqueues += count_enqueuer[2 * i + 1];
	462	}
	463	for (i = 0; i < nr_dequeuers; i++) {
	464	err = pthread_join(tid_dequeuer[i], &tret);
	465	if (err != 0)
	466	exit(1);
	467	tot_dequeues += count_dequeuer[2 * i];
	468	tot_successful_dequeues += count_dequeuer[2 * i + 1];
	469	}
	470
	471	test_end(&end_dequeues);
	472
	473	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
	474	tot_enqueues, tot_dequeues);
	475	printf_verbose("total number of successful enqueues : %llu, "
	476	"successful dequeues %llu\n",
	477	tot_successful_enqueues, tot_successful_dequeues);
	478	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
	479	"nr_dequeuers %3u "
	480	"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
	481	"successful enqueues %12llu successful dequeues %12llu "
482	"end_dequeues %llu nr_ops %12llu\n",
483	argv[0], duration, nr_enqueuers, wdelay,
484	nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
485	tot_successful_enqueues,
486	tot_successful_dequeues, end_dequeues,
487	tot_enqueues + tot_dequeues);
488	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues)
489	printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
490	"succ. dequeues + end dequeues %llu.\n",
491	tot_successful_enqueues,
492	tot_successful_dequeues + end_dequeues);
493
494	free(count_enqueuer);
495	free(count_dequeuer);
496	free(tid_enqueuer);
497	free(tid_dequeuer);
498	return 0;
499	}