[urcu.git] / tests / benchmark / 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.
 */

#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 <errno.h>

#include <urcu/arch.h>
#include <urcu/tls-compat.h>
#include <urcu/uatomic.h>
#include "cpuset.h"
#include "thread-id.h"

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

#ifndef DYNAMIC_LINK_TEST
#define _LGPL_SOURCE
#endif
#include <urcu/wfcqueue.h>

enum test_sync {
	TEST_SYNC_NONE = 0,
	TEST_SYNC_MUTEX,
};

static enum test_sync test_sync;

static int test_force_sync;

static volatile int test_go, test_stop_enqueue, test_stop_dequeue;

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, test_wait_empty;
static int test_enqueue_stopped;

#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;

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_dequeue;
}

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

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 DEFINE_URCU_TLS(unsigned long long, nr_empty_dest_enqueues);
static DEFINE_URCU_TLS(unsigned long long, nr_splice);
static DEFINE_URCU_TLS(unsigned long long, nr_dequeue_last);

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;
	bool was_nonempty;

	printf_verbose("thread_begin %s, tid %lu\n",
			"enqueuer", urcu_get_thread_id());

	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);
		was_nonempty = cds_wfcq_enqueue(&head, &tail, node);
		URCU_TLS(nr_successful_enqueues)++;
		if (!was_nonempty)
			URCU_TLS(nr_empty_dest_enqueues)++;

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

	uatomic_inc(&test_enqueue_stopped);
	count[0] = URCU_TLS(nr_enqueues);
	count[1] = URCU_TLS(nr_successful_enqueues);
	count[2] = URCU_TLS(nr_empty_dest_enqueues);
	printf_verbose("enqueuer thread_end, tid %lu, "
			"enqueues %llu successful_enqueues %llu, "
			"empty_dest_enqueues %llu\n",
			urcu_get_thread_id(),
			URCU_TLS(nr_enqueues),
			URCU_TLS(nr_successful_enqueues),
			URCU_TLS(nr_empty_dest_enqueues));
	return ((void*)1);

}

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

	if (sync == TEST_SYNC_MUTEX)
		node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
				&state);
	else
		node = __cds_wfcq_dequeue_with_state_blocking(&head, &tail,
				&state);

	if (state & CDS_WFCQ_STATE_LAST)
		URCU_TLS(nr_dequeue_last)++;

	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;
	enum cds_wfcq_ret ret;

	cds_wfcq_init(&tmp_head, &tmp_tail);

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

	switch (ret) {
	case CDS_WFCQ_RET_WOULDBLOCK:
		assert(0);	/* blocking call */
		break;
	case CDS_WFCQ_RET_DEST_EMPTY:
		URCU_TLS(nr_splice)++;
		URCU_TLS(nr_dequeue_last)++;
		/* ok */
		break;
	case CDS_WFCQ_RET_DEST_NON_EMPTY:
		assert(0);	/* entirely unexpected */
		break;
	case CDS_WFCQ_RET_SRC_EMPTY:
		/* ok, we could even skip iteration on dest if we wanted */
		break;
	}

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

static void *thr_dequeuer(void *_count)
{
	unsigned long long *count = _count;
	unsigned int counter = 0;

	printf_verbose("thread_begin %s, tid %lu\n",
			"dequeuer", urcu_get_thread_id());

	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, tid %lu, "
			"dequeues %llu, successful_dequeues %llu, "
			"nr_splice %llu\n",
			urcu_get_thread_id(),
			URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
			URCU_TLS(nr_splice));
	count[0] = URCU_TLS(nr_dequeues);
	count[1] = URCU_TLS(nr_successful_dequeues);
	count[2] = URCU_TLS(nr_splice);
	count[3] = URCU_TLS(nr_dequeue_last);
	return ((void*)2);
}

static void test_end(unsigned long long *nr_dequeues,
		unsigned long long *nr_dequeue_last)
{
	struct cds_wfcq_node *node;
	int state;

	do {
		node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
				&state);
		if (node) {
			if (state & CDS_WFCQ_STATE_LAST)
				(*nr_dequeue_last)++;
			free(node);
			(*nr_dequeues)++;
		}
	} while (node);
}

static void show_usage(int argc, char **argv)
{
	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s) <OPTIONS>\n",
		argv[0]);
	printf("OPTIONS:\n");
	printf("	[-d delay] (enqueuer period (in loops))\n");
	printf("	[-c duration] (dequeuer period (in loops))\n");
	printf("	[-v] (verbose output)\n");
	printf("	[-a cpu#] [-a cpu#]... (affinity)\n");
	printf("	[-q] (test dequeue)\n");
	printf("	[-s] (test splice, enabled by default)\n");
	printf("	[-M] (use mutex external synchronization)\n");
	printf("		Note: default: no external synchronization used.\n");
	printf("	[-f] (force user-provided synchronization)\n");
	printf("	[-w] Wait for dequeuer to empty queue\n");
	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,
			   tot_empty_dest_enqueues = 0,
			   tot_splice = 0, tot_dequeue_last = 0;
	unsigned long long end_dequeues = 0;
	int i, a, retval = 0;

	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 'w':
			test_wait_empty = 1;
			break;
		case 'f':
			test_force_sync = 1;
			break;
		}
	}

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

	if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_dequeue) {
		if (test_force_sync) {
			fprintf(stderr, "[WARNING] Using dequeue concurrently "
				"with other dequeue or splice without external "
				"synchronization. Expect run-time failure.\n");
		} else {
			printf("Enforcing mutex synchronization\n");
			test_sync = TEST_SYNC_MUTEX;
		}
	}

	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");
	if (test_wait_empty)
		printf_verbose("Wait for dequeuers to empty queue.\n");
	printf_verbose("Writer delay : %lu loops.\n", rduration);
	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	printf_verbose("thread %-6s, tid %lu\n",
			"main", urcu_get_thread_id());

	tid_enqueuer = calloc(nr_enqueuers, sizeof(*tid_enqueuer));
	tid_dequeuer = calloc(nr_dequeuers, sizeof(*tid_dequeuer));
	count_enqueuer = calloc(nr_enqueuers, 3 * sizeof(*count_enqueuer));
	count_dequeuer = calloc(nr_dequeuers, 4 * sizeof(*count_dequeuer));
	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[3 * i]);
		if (err != 0)
			exit(1);
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
				     &count_dequeuer[4 * i]);
		if (err != 0)
			exit(1);
	}

	cmm_smp_mb();

	test_go = 1;

	for (i = 0; i < duration; i++) {
		sleep(1);
		if (verbose_mode) {
			fwrite(".", sizeof(char), 1, stdout);
			fflush(stdout);
		}
	}

	test_stop_enqueue = 1;

	if (test_wait_empty) {
		while (nr_enqueuers != uatomic_read(&test_enqueue_stopped)) {
			sleep(1);
		}
		while (!cds_wfcq_empty(&head, &tail)) {
			sleep(1);
		}
	}

	test_stop_dequeue = 1;

	for (i = 0; i < nr_enqueuers; i++) {
		err = pthread_join(tid_enqueuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_enqueues += count_enqueuer[3 * i];
		tot_successful_enqueues += count_enqueuer[3 * i + 1];
		tot_empty_dest_enqueues += count_enqueuer[3 * i + 2];
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_join(tid_dequeuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_dequeues += count_dequeuer[4 * i];
		tot_successful_dequeues += count_dequeuer[4 * i + 1];
		tot_splice += count_dequeuer[4 * i + 2];
		tot_dequeue_last += count_dequeuer[4 * i + 3];
	}
	
	test_end(&end_dequeues, &tot_dequeue_last);

	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
		       tot_enqueues, tot_dequeues);
	printf_verbose("total number of successful enqueues : %llu, "
		       "enqueues to empty dest : %llu, "
		       "successful dequeues %llu, "
		       "splice : %llu, dequeue_last : %llu\n",
		       tot_successful_enqueues,
		       tot_empty_dest_enqueues,
		       tot_successful_dequeues,
		       tot_splice, tot_dequeue_last);
	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
		"nr_dequeuers %3u "
		"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
		"successful enqueues %12llu enqueues to empty dest %12llu "
		"successful dequeues %12llu splice %12llu "
		"dequeue_last %llu "
		"end_dequeues %llu nr_ops %12llu\n",
		argv[0], duration, nr_enqueuers, wdelay,
		nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
		tot_successful_enqueues,
		tot_empty_dest_enqueues,
		tot_successful_dequeues, tot_splice, tot_dequeue_last,
		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);
		retval = 1;
	}

	/*
	 * If only using splice to dequeue, the enqueuer should see
	 * exactly as many empty queues than the number of non-empty
	 * src splice.
	 */
	if (tot_empty_dest_enqueues != tot_dequeue_last) {
		printf("WARNING! Discrepancy between empty enqueue (%llu) and "
			"number of dequeue of last element (%llu)\n",
			tot_empty_dest_enqueues,
			tot_dequeue_last);
		retval = 1;
	}
	cds_wfcq_destroy(&head, &tail);
	free(count_enqueuer);
	free(count_dequeuer);
	free(tid_enqueuer);
	free(tid_dequeuer);
	return retval;
}
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
5e70d572 MD	24	#include <stdio.h>
	25	#include <pthread.h>
	26	#include <stdlib.h>
	27	#include <stdint.h>
	28	#include <stdbool.h>
	29	#include <string.h>
	30	#include <sys/types.h>
	31	#include <sys/wait.h>
	32	#include <unistd.h>
	33	#include <stdio.h>
	34	#include <assert.h>
5e70d572 MD	35	#include <errno.h>
	36
	37	#include <urcu/arch.h>
	38	#include <urcu/tls-compat.h>
985c3168	39	#include <urcu/uatomic.h>
2953b501	40	#include "cpuset.h"
94df6318	41	#include "thread-id.h"
5e70d572 MD	42
	43	/* hardcoded number of CPUs */
	44	#define NR_CPUS 16384
	45
5e70d572 MD	46	#ifndef DYNAMIC_LINK_TEST
	47	#define _LGPL_SOURCE
	48	#endif
5e70d572 MD	49	#include <urcu/wfcqueue.h>
5e70d572 MD	50
f5d36fed	51	enum test_sync {
372b9ad7 MD	52	TEST_SYNC_NONE = 0,
372b9ad7 MD	53	TEST_SYNC_MUTEX,
f5d36fed MD	54	};
	55
	56	static enum test_sync test_sync;
	57
372b9ad7 MD	58	static int test_force_sync;
372b9ad7 MD	59
cf9451dc	60	static volatile int test_go, test_stop_enqueue, test_stop_dequeue;
5e70d572 MD	61
	62	static unsigned long rduration;
	63
	64	static unsigned long duration;
	65
	66	/* read-side C.S. duration, in loops */
	67	static unsigned long wdelay;
	68
ab0aacbe	69	static inline void loop_sleep(unsigned long loops)
5e70d572	70	{
ab0aacbe	71	while (loops-- != 0)
5e70d572 MD	72	caa_cpu_relax();
	73	}
	74
	75	static int verbose_mode;
	76
cf9451dc MD	77	static int test_dequeue, test_splice, test_wait_empty;
cf9451dc MD	78	static int test_enqueue_stopped;
f5d36fed	79
5e70d572 MD	80	#define printf_verbose(fmt, args...) \
	81	do { \
	82	if (verbose_mode) \
f5d36fed	83	printf(fmt, ## args); \
5e70d572 MD	84	} while (0)
	85
	86	static unsigned int cpu_affinities[NR_CPUS];
	87	static unsigned int next_aff = 0;
	88	static int use_affinity = 0;
	89
	90	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	91
5e70d572 MD	92	static void set_affinity(void)
5e70d572 MD	93	{
95bc7fb9	94	#if HAVE_SCHED_SETAFFINITY
5e70d572	95	cpu_set_t mask;
95bc7fb9 MD	96	int cpu, ret;
95bc7fb9 MD	97	#endif /* HAVE_SCHED_SETAFFINITY */
5e70d572 MD	98
	99	if (!use_affinity)
	100	return;
	101
	102	#if HAVE_SCHED_SETAFFINITY
	103	ret = pthread_mutex_lock(&affinity_mutex);
	104	if (ret) {
	105	perror("Error in pthread mutex lock");
	106	exit(-1);
	107	}
	108	cpu = cpu_affinities[next_aff++];
	109	ret = pthread_mutex_unlock(&affinity_mutex);
	110	if (ret) {
	111	perror("Error in pthread mutex unlock");
	112	exit(-1);
	113	}
	114
	115	CPU_ZERO(&mask);
	116	CPU_SET(cpu, &mask);
	117	#if SCHED_SETAFFINITY_ARGS == 2
	118	sched_setaffinity(0, &mask);
	119	#else
	120	sched_setaffinity(0, sizeof(mask), &mask);
	121	#endif
	122	#endif /* HAVE_SCHED_SETAFFINITY */
	123	}
	124
	125	/*
	126	* returns 0 if test should end.
	127	*/
	128	static int test_duration_dequeue(void)
	129	{
cf9451dc	130	return !test_stop_dequeue;
5e70d572 MD	131	}
	132
	133	static int test_duration_enqueue(void)
	134	{
cf9451dc	135	return !test_stop_enqueue;
5e70d572 MD	136	}
	137
	138	static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
	139	static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);
	140
	141	static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
	142	static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);
cf9451dc MD	143	static DEFINE_URCU_TLS(unsigned long long, nr_empty_dest_enqueues);
cf9451dc MD	144	static DEFINE_URCU_TLS(unsigned long long, nr_splice);
db182e31	145	static DEFINE_URCU_TLS(unsigned long long, nr_dequeue_last);
5e70d572 MD	146
	147	static unsigned int nr_enqueuers;
	148	static unsigned int nr_dequeuers;
	149
	150	static struct cds_wfcq_head __attribute__((aligned(CAA_CACHE_LINE_SIZE))) head;
	151	static struct cds_wfcq_tail __attribute__((aligned(CAA_CACHE_LINE_SIZE))) tail;
	152
f5d36fed	153	static void thr_enqueuer(void _count)
5e70d572 MD	154	{
5e70d572 MD	155	unsigned long long *count = _count;
cf9451dc	156	bool was_nonempty;
5e70d572	157
94df6318 MD	158	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	159	"enqueuer", urcu_get_thread_id());
5e70d572 MD	160
	161	set_affinity();
	162
	163	while (!test_go)
	164	{
	165	}
	166	cmm_smp_mb();
	167
	168	for (;;) {
	169	struct cds_wfcq_node node = malloc(sizeof(node));
	170	if (!node)
	171	goto fail;
	172	cds_wfcq_node_init(node);
cf9451dc	173	was_nonempty = cds_wfcq_enqueue(&head, &tail, node);
5e70d572	174	URCU_TLS(nr_successful_enqueues)++;
cf9451dc MD	175	if (!was_nonempty)
cf9451dc MD	176	URCU_TLS(nr_empty_dest_enqueues)++;
5e70d572 MD	177
	178	if (caa_unlikely(wdelay))
	179	loop_sleep(wdelay);
	180	fail:
	181	URCU_TLS(nr_enqueues)++;
	182	if (caa_unlikely(!test_duration_enqueue()))
	183	break;
	184	}
	185
cf9451dc	186	uatomic_inc(&test_enqueue_stopped);
5e70d572 MD	187	count[0] = URCU_TLS(nr_enqueues);
5e70d572 MD	188	count[1] = URCU_TLS(nr_successful_enqueues);
cf9451dc	189	count[2] = URCU_TLS(nr_empty_dest_enqueues);
94df6318 MD	190	printf_verbose("enqueuer thread_end, tid %lu, "
	191	"enqueues %llu successful_enqueues %llu, "
	192	"empty_dest_enqueues %llu\n",
	193	urcu_get_thread_id(),
	194	URCU_TLS(nr_enqueues),
	195	URCU_TLS(nr_successful_enqueues),
	196	URCU_TLS(nr_empty_dest_enqueues));
5e70d572 MD	197	return ((void*)1);
	198
	199	}
	200
f5d36fed MD	201	static void do_test_dequeue(enum test_sync sync)
	202	{
	203	struct cds_wfcq_node *node;
db182e31	204	int state;
f5d36fed MD	205
f5d36fed MD	206	if (sync == TEST_SYNC_MUTEX)
db182e31 MD	207	node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
db182e31 MD	208	&state);
f5d36fed	209	else
db182e31 MD	210	node = __cds_wfcq_dequeue_with_state_blocking(&head, &tail,
	211	&state);
	212
	213	if (state & CDS_WFCQ_STATE_LAST)
	214	URCU_TLS(nr_dequeue_last)++;
f5d36fed MD	215
	216	if (node) {
	217	free(node);
	218	URCU_TLS(nr_successful_dequeues)++;
	219	}
	220	URCU_TLS(nr_dequeues)++;
	221	}
	222
	223	static void do_test_splice(enum test_sync sync)
	224	{
	225	struct cds_wfcq_head tmp_head;
	226	struct cds_wfcq_tail tmp_tail;
	227	struct cds_wfcq_node node, n;
cf9451dc	228	enum cds_wfcq_ret ret;
f5d36fed MD	229
	230	cds_wfcq_init(&tmp_head, &tmp_tail);
	231
	232	if (sync == TEST_SYNC_MUTEX)
cf9451dc	233	ret = cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
f5d36fed MD	234	&head, &tail);
f5d36fed MD	235	else
cf9451dc	236	ret = __cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
f5d36fed MD	237	&head, &tail);
f5d36fed MD	238
cf9451dc MD	239	switch (ret) {
	240	case CDS_WFCQ_RET_WOULDBLOCK:
	241	assert(0); /* blocking call */
	242	break;
	243	case CDS_WFCQ_RET_DEST_EMPTY:
	244	URCU_TLS(nr_splice)++;
db182e31	245	URCU_TLS(nr_dequeue_last)++;
cf9451dc MD	246	/* ok */
	247	break;
	248	case CDS_WFCQ_RET_DEST_NON_EMPTY:
	249	assert(0); /* entirely unexpected */
	250	break;
	251	case CDS_WFCQ_RET_SRC_EMPTY:
	252	/* ok, we could even skip iteration on dest if we wanted */
	253	break;
	254	}
	255
f5d36fed MD	256	__cds_wfcq_for_each_blocking_safe(&tmp_head, &tmp_tail, node, n) {
	257	free(node);
	258	URCU_TLS(nr_successful_dequeues)++;
	259	URCU_TLS(nr_dequeues)++;
	260	}
2af1c19e	261	cds_wfcq_destroy(&tmp_head, &tmp_tail);
f5d36fed MD	262	}
	263
	264	static void thr_dequeuer(void _count)
5e70d572 MD	265	{
5e70d572 MD	266	unsigned long long *count = _count;
f42bc7ef	267	unsigned int counter = 0;
5e70d572	268
94df6318 MD	269	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	270	"dequeuer", urcu_get_thread_id());
5e70d572 MD	271
	272	set_affinity();
	273
	274	while (!test_go)
	275	{
	276	}
	277	cmm_smp_mb();
	278
	279	for (;;) {
f5d36fed MD	280	if (test_dequeue && test_splice) {
	281	if (counter & 1)
	282	do_test_dequeue(test_sync);
	283	else
	284	do_test_splice(test_sync);
	285	counter++;
	286	} else {
	287	if (test_dequeue)
	288	do_test_dequeue(test_sync);
	289	else
	290	do_test_splice(test_sync);
5e70d572	291	}
5e70d572 MD	292	if (caa_unlikely(!test_duration_dequeue()))
	293	break;
	294	if (caa_unlikely(rduration))
	295	loop_sleep(rduration);
	296	}
	297
94df6318 MD	298	printf_verbose("dequeuer thread_end, tid %lu, "
	299	"dequeues %llu, successful_dequeues %llu, "
	300	"nr_splice %llu\n",
	301	urcu_get_thread_id(),
	302	URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
	303	URCU_TLS(nr_splice));
5e70d572 MD	304	count[0] = URCU_TLS(nr_dequeues);
5e70d572 MD	305	count[1] = URCU_TLS(nr_successful_dequeues);
cf9451dc	306	count[2] = URCU_TLS(nr_splice);
db182e31	307	count[3] = URCU_TLS(nr_dequeue_last);
5e70d572 MD	308	return ((void*)2);
	309	}
	310
db182e31 MD	311	static void test_end(unsigned long long *nr_dequeues,
db182e31 MD	312	unsigned long long *nr_dequeue_last)
5e70d572 MD	313	{
5e70d572 MD	314	struct cds_wfcq_node *node;
db182e31	315	int state;
5e70d572 MD	316
5e70d572 MD	317	do {
db182e31 MD	318	node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
db182e31 MD	319	&state);
5e70d572	320	if (node) {
db182e31 MD	321	if (state & CDS_WFCQ_STATE_LAST)
db182e31 MD	322	(*nr_dequeue_last)++;
5e70d572 MD	323	free(node);
	324	(*nr_dequeues)++;
	325	}
	326	} while (node);
	327	}
	328
f5d36fed	329	static void show_usage(int argc, char **argv)
5e70d572	330	{
06637138 MD	331	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s) <OPTIONS>\n",
	332	argv[0]);
	333	printf("OPTIONS:\n");
	334	printf(" [-d delay] (enqueuer period (in loops))\n");
	335	printf(" [-c duration] (dequeuer period (in loops))\n");
	336	printf(" [-v] (verbose output)\n");
	337	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
	338	printf(" [-q] (test dequeue)\n");
	339	printf(" [-s] (test splice, enabled by default)\n");
	340	printf(" [-M] (use mutex external synchronization)\n");
	341	printf(" Note: default: no external synchronization used.\n");
	342	printf(" [-f] (force user-provided synchronization)\n");
	343	printf(" [-w] Wait for dequeuer to empty queue\n");
5e70d572 MD	344	printf("\n");
	345	}
	346
	347	int main(int argc, char **argv)
	348	{
	349	int err;
	350	pthread_t tid_enqueuer, tid_dequeuer;
	351	void *tret;
	352	unsigned long long count_enqueuer, count_dequeuer;
	353	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	354	unsigned long long tot_successful_enqueues = 0,
cf9451dc MD	355	tot_successful_dequeues = 0,
cf9451dc MD	356	tot_empty_dest_enqueues = 0,
db182e31	357	tot_splice = 0, tot_dequeue_last = 0;
5e70d572	358	unsigned long long end_dequeues = 0;
cf9451dc	359	int i, a, retval = 0;
5e70d572 MD	360
	361	if (argc < 4) {
	362	show_usage(argc, argv);
	363	return -1;
	364	}
	365
	366	err = sscanf(argv[1], "%u", &nr_dequeuers);
	367	if (err != 1) {
	368	show_usage(argc, argv);
	369	return -1;
	370	}
	371
	372	err = sscanf(argv[2], "%u", &nr_enqueuers);
	373	if (err != 1) {
	374	show_usage(argc, argv);
	375	return -1;
	376	}
	377
	378	err = sscanf(argv[3], "%lu", &duration);
	379	if (err != 1) {
	380	show_usage(argc, argv);
	381	return -1;
	382	}
	383
	384	for (i = 4; i < argc; i++) {
	385	if (argv[i][0] != '-')
	386	continue;
	387	switch (argv[i][1]) {
	388	case 'a':
	389	if (argc < i + 2) {
	390	show_usage(argc, argv);
	391	return -1;
	392	}
	393	a = atoi(argv[++i]);
	394	cpu_affinities[next_aff++] = a;
	395	use_affinity = 1;
	396	printf_verbose("Adding CPU %d affinity\n", a);
	397	break;
	398	case 'c':
	399	if (argc < i + 2) {
	400	show_usage(argc, argv);
	401	return -1;
	402	}
	403	rduration = atol(argv[++i]);
	404	break;
	405	case 'd':
	406	if (argc < i + 2) {
	407	show_usage(argc, argv);
	408	return -1;
	409	}
	410	wdelay = atol(argv[++i]);
	411	break;
	412	case 'v':
	413	verbose_mode = 1;
	414	break;
f5d36fed MD	415	case 'q':
	416	test_dequeue = 1;
	417	break;
	418	case 's':
	419	test_splice = 1;
	420	break;
	421	case 'M':
	422	test_sync = TEST_SYNC_MUTEX;
	423	break;
cf9451dc MD	424	case 'w':
	425	test_wait_empty = 1;
	426	break;
372b9ad7 MD	427	case 'f':
	428	test_force_sync = 1;
	429	break;
5e70d572 MD	430	}
	431	}
	432
f5d36fed MD	433	/* activate splice test by default */
	434	if (!test_dequeue && !test_splice)
	435	test_splice = 1;
	436
372b9ad7 MD	437	if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_dequeue) {
	438	if (test_force_sync) {
	439	fprintf(stderr, "[WARNING] Using dequeue concurrently "
	440	"with other dequeue or splice without external "
	441	"synchronization. Expect run-time failure.\n");
	442	} else {
	443	printf("Enforcing mutex synchronization\n");
	444	test_sync = TEST_SYNC_MUTEX;
	445	}
	446	}
	447
5e70d572 MD	448	printf_verbose("running test for %lu seconds, %u enqueuers, "
	449	"%u dequeuers.\n",
	450	duration, nr_enqueuers, nr_dequeuers);
f5d36fed MD	451	if (test_dequeue)
	452	printf_verbose("dequeue test activated.\n");
	453	else
	454	printf_verbose("splice test activated.\n");
	455	if (test_sync == TEST_SYNC_MUTEX)
	456	printf_verbose("External sync: mutex.\n");
	457	else
	458	printf_verbose("External sync: none.\n");
cf9451dc MD	459	if (test_wait_empty)
cf9451dc MD	460	printf_verbose("Wait for dequeuers to empty queue.\n");
5e70d572 MD	461	printf_verbose("Writer delay : %lu loops.\n", rduration);
5e70d572 MD	462	printf_verbose("Reader duration : %lu loops.\n", wdelay);
94df6318 MD	463	printf_verbose("thread %-6s, tid %lu\n",
94df6318 MD	464	"main", urcu_get_thread_id());
5e70d572	465
9aa14175 MD	466	tid_enqueuer = calloc(nr_enqueuers, sizeof(*tid_enqueuer));
	467	tid_dequeuer = calloc(nr_dequeuers, sizeof(*tid_dequeuer));
	468	count_enqueuer = calloc(nr_enqueuers, 3 * sizeof(*count_enqueuer));
	469	count_dequeuer = calloc(nr_dequeuers, 4 * sizeof(*count_dequeuer));
5e70d572 MD	470	cds_wfcq_init(&head, &tail);
	471
	472	next_aff = 0;
	473
	474	for (i = 0; i < nr_enqueuers; i++) {
	475	err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
cf9451dc	476	&count_enqueuer[3 * i]);
5e70d572 MD	477	if (err != 0)
	478	exit(1);
	479	}
	480	for (i = 0; i < nr_dequeuers; i++) {
	481	err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
db182e31	482	&count_dequeuer[4 * i]);
5e70d572 MD	483	if (err != 0)
	484	exit(1);
	485	}
	486
	487	cmm_smp_mb();
	488
	489	test_go = 1;
	490
	491	for (i = 0; i < duration; i++) {
	492	sleep(1);
4b665350 MD	493	if (verbose_mode) {
	494	fwrite(".", sizeof(char), 1, stdout);
	495	fflush(stdout);
	496	}
5e70d572 MD	497	}
5e70d572 MD	498
cf9451dc MD	499	test_stop_enqueue = 1;
	500
	501	if (test_wait_empty) {
	502	while (nr_enqueuers != uatomic_read(&test_enqueue_stopped)) {
	503	sleep(1);
	504	}
	505	while (!cds_wfcq_empty(&head, &tail)) {
	506	sleep(1);
	507	}
	508	}
	509
	510	test_stop_dequeue = 1;
5e70d572 MD	511
	512	for (i = 0; i < nr_enqueuers; i++) {
	513	err = pthread_join(tid_enqueuer[i], &tret);
	514	if (err != 0)
	515	exit(1);
cf9451dc MD	516	tot_enqueues += count_enqueuer[3 * i];
	517	tot_successful_enqueues += count_enqueuer[3 * i + 1];
	518	tot_empty_dest_enqueues += count_enqueuer[3 * i + 2];
5e70d572 MD	519	}
	520	for (i = 0; i < nr_dequeuers; i++) {
	521	err = pthread_join(tid_dequeuer[i], &tret);
	522	if (err != 0)
	523	exit(1);
db182e31 MD	524	tot_dequeues += count_dequeuer[4 * i];
	525	tot_successful_dequeues += count_dequeuer[4 * i + 1];
	526	tot_splice += count_dequeuer[4 * i + 2];
	527	tot_dequeue_last += count_dequeuer[4 * i + 3];
5e70d572 MD	528	}
5e70d572 MD	529
db182e31	530	test_end(&end_dequeues, &tot_dequeue_last);
5e70d572 MD	531
	532	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
	533	tot_enqueues, tot_dequeues);
	534	printf_verbose("total number of successful enqueues : %llu, "
cf9451dc	535	"enqueues to empty dest : %llu, "
23ae48ef	536	"successful dequeues %llu, "
db182e31	537	"splice : %llu, dequeue_last : %llu\n",
cf9451dc MD	538	tot_successful_enqueues,
	539	tot_empty_dest_enqueues,
	540	tot_successful_dequeues,
db182e31	541	tot_splice, tot_dequeue_last);
5e70d572 MD	542	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
	543	"nr_dequeuers %3u "
	544	"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
cf9451dc MD	545	"successful enqueues %12llu enqueues to empty dest %12llu "
cf9451dc MD	546	"successful dequeues %12llu splice %12llu "
db182e31	547	"dequeue_last %llu "
5e70d572 MD	548	"end_dequeues %llu nr_ops %12llu\n",
	549	argv[0], duration, nr_enqueuers, wdelay,
	550	nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
	551	tot_successful_enqueues,
cf9451dc	552	tot_empty_dest_enqueues,
db182e31 MD	553	tot_successful_dequeues, tot_splice, tot_dequeue_last,
db182e31 MD	554	end_dequeues,
5e70d572	555	tot_enqueues + tot_dequeues);
cf9451dc MD	556
cf9451dc MD	557	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues) {
5e70d572 MD	558	printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
	559	"succ. dequeues + end dequeues %llu.\n",
	560	tot_successful_enqueues,
	561	tot_successful_dequeues + end_dequeues);
cf9451dc MD	562	retval = 1;
cf9451dc MD	563	}
5e70d572	564
cf9451dc MD	565	/*
	566	* If only using splice to dequeue, the enqueuer should see
	567	* exactly as many empty queues than the number of non-empty
	568	* src splice.
	569	*/
db182e31	570	if (tot_empty_dest_enqueues != tot_dequeue_last) {
cf9451dc	571	printf("WARNING! Discrepancy between empty enqueue (%llu) and "
db182e31	572	"number of dequeue of last element (%llu)\n",
cf9451dc	573	tot_empty_dest_enqueues,
db182e31	574	tot_dequeue_last);
cf9451dc MD	575	retval = 1;
cf9451dc MD	576	}
2af1c19e	577	cds_wfcq_destroy(&head, &tail);
5e70d572 MD	578	free(count_enqueuer);
	579	free(count_dequeuer);
	580	free(tid_enqueuer);
	581	free(tid_dequeuer);
cf9451dc	582	return retval;
5e70d572	583	}