[urcu.git] / tests / benchmark / test_urcu_wfs.c

/*
 * test_urcu_wfs.c
 *
 * Userspace RCU library - example RCU-based lock-free stack
 *
 * 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/wfstack.h>

/*
 * External synchronization used.
 */
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_pop, test_pop_all, 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_pop_all);
static DEFINE_URCU_TLS(unsigned long long, nr_pop_last);

static unsigned int nr_enqueuers;
static unsigned int nr_dequeuers;

static struct cds_wfs_stack s;

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_wfs_node *node = malloc(sizeof(*node));
		if (!node)
			goto fail;
		cds_wfs_node_init(node);
		was_nonempty = cds_wfs_push(&s, 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_pop(enum test_sync sync)
{
	struct cds_wfs_node *node;
	int state;

	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_lock(&s);
	node = __cds_wfs_pop_with_state_blocking(&s, &state);
	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_unlock(&s);

	if (node) {
		if (state & CDS_WFS_STATE_LAST)
			URCU_TLS(nr_pop_last)++;
		free(node);
		URCU_TLS(nr_successful_dequeues)++;
	}
	URCU_TLS(nr_dequeues)++;
}

static void do_test_pop_all(enum test_sync sync)
{
	struct cds_wfs_head *head;
	struct cds_wfs_node *node, *n;

	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_lock(&s);
	head = __cds_wfs_pop_all(&s);
	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_unlock(&s);

	/* Check if empty */
	if (cds_wfs_first(head) == NULL)
		return;

	URCU_TLS(nr_pop_all)++;
	URCU_TLS(nr_pop_last)++;

	cds_wfs_for_each_blocking_safe(head, 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 = 0;

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

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	assert(test_pop || test_pop_all);

	for (;;) {
		if (test_pop && test_pop_all) {
			if (counter & 1)
				do_test_pop(test_sync);
			else
				do_test_pop_all(test_sync);
			counter++;
		} else {
			if (test_pop)
				do_test_pop(test_sync);
			else
				do_test_pop_all(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 "
			"pop_all %llu pop_last %llu\n",
			urcu_get_thread_id(),
			URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
			URCU_TLS(nr_pop_all),
			URCU_TLS(nr_pop_last));
	count[0] = URCU_TLS(nr_dequeues);
	count[1] = URCU_TLS(nr_successful_dequeues);
	count[2] = URCU_TLS(nr_pop_all);
	count[3] = URCU_TLS(nr_pop_last);
	return ((void*)2);
}

static void test_end(struct cds_wfs_stack *s, unsigned long long *nr_dequeues,
		unsigned long long *nr_pop_last)
{
	struct cds_wfs_node *node;
	int state;

	do {
		node = cds_wfs_pop_with_state_blocking(s, &state);
		if (node) {
			if (state & CDS_WFS_STATE_LAST)
				(*nr_pop_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("	[-p] (test pop)\n");
	printf("	[-P] (test pop_all, 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 stack\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_pop_all = 0, tot_pop_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 'p':
			test_pop = 1;
			break;
		case 'P':
			test_pop_all = 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 pop_all test by default */
	if (!test_pop && !test_pop_all)
		test_pop_all = 1;

	if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_pop) {
		if (test_force_sync) {
			fprintf(stderr, "[WARNING] Using pop concurrently "
				"with other pop or pop_all 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_pop)
		printf_verbose("pop test activated.\n");
	if (test_pop_all)
		printf_verbose("pop_all 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 stack.\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_wfs_init(&s);

	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_wfs_empty(&s)) {
			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_pop_all += count_dequeuer[4 * i + 2];
		tot_pop_last += count_dequeuer[4 * i + 3];
	}
	
	test_end(&s, &end_dequeues, &tot_pop_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, "
		       "pop_all : %llu, pop_last : %llu\n",
		       tot_successful_enqueues,
		       tot_empty_dest_enqueues,
		       tot_successful_dequeues,
		       tot_pop_all, tot_pop_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 pop_all %12llu "
		"pop_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_pop_all, tot_pop_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;
	}
	/*
	 * The enqueuer should see exactly as many empty queues than the
	 * number of non-empty stacks dequeued.
	 */
	if (tot_empty_dest_enqueues != tot_pop_last) {
		printf("WARNING! Discrepancy between empty enqueue (%llu) and "
			"number of pop last (%llu)\n",
			tot_empty_dest_enqueues,
			tot_pop_last);
		retval = 1;
	}
	cds_wfs_destroy(&s);
	free(count_enqueuer);
	free(count_dequeuer);
	free(tid_enqueuer);
	free(tid_dequeuer);
	return retval;
}
Commit	Line	Data
a5eb5ffc MD	1	/*
	2	* test_urcu_wfs.c
	3	*
	4	* Userspace RCU library - example RCU-based lock-free stack
	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
a5eb5ffc 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>
a5eb5ffc MD	35	#include <errno.h>
	36
	37	#include <urcu/arch.h>
bd252a04	38	#include <urcu/tls-compat.h>
96a0c0cd	39	#include <urcu/uatomic.h>
2953b501	40	#include "cpuset.h"
94df6318	41	#include "thread-id.h"
65fcc7e9	42
a5eb5ffc MD	43	/* hardcoded number of CPUs */
	44	#define NR_CPUS 16384
	45
a5eb5ffc MD	46	#ifndef DYNAMIC_LINK_TEST
	47	#define _LGPL_SOURCE
	48	#endif
cb3f3d6b	49	#include <urcu/wfstack.h>
a5eb5ffc	50
69328034 MD	51	/*
	52	* External synchronization used.
	53	*/
	54	enum test_sync {
	55	TEST_SYNC_NONE = 0,
	56	TEST_SYNC_MUTEX,
	57	};
	58
	59	static enum test_sync test_sync;
	60
0ee400bd MD	61	static int test_force_sync;
0ee400bd MD	62
d05e9936	63	static volatile int test_go, test_stop_enqueue, test_stop_dequeue;
a5eb5ffc MD	64
	65	static unsigned long rduration;
	66
	67	static unsigned long duration;
	68
	69	/* read-side C.S. duration, in loops */
	70	static unsigned long wdelay;
	71
ab0aacbe	72	static inline void loop_sleep(unsigned long loops)
a5eb5ffc	73	{
ab0aacbe	74	while (loops-- != 0)
06f22bdb	75	caa_cpu_relax();
a5eb5ffc MD	76	}
	77
	78	static int verbose_mode;
	79
d05e9936 MD	80	static int test_pop, test_pop_all, test_wait_empty;
d05e9936 MD	81	static int test_enqueue_stopped;
69328034	82
a5eb5ffc MD	83	#define printf_verbose(fmt, args...) \
	84	do { \
	85	if (verbose_mode) \
69328034	86	printf(fmt, ## args); \
a5eb5ffc MD	87	} while (0)
	88
	89	static unsigned int cpu_affinities[NR_CPUS];
	90	static unsigned int next_aff = 0;
	91	static int use_affinity = 0;
	92
	93	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	94
a5eb5ffc MD	95	static void set_affinity(void)
a5eb5ffc MD	96	{
95bc7fb9	97	#if HAVE_SCHED_SETAFFINITY
a5eb5ffc	98	cpu_set_t mask;
95bc7fb9 MD	99	int cpu, ret;
95bc7fb9 MD	100	#endif /* HAVE_SCHED_SETAFFINITY */
a5eb5ffc MD	101
	102	if (!use_affinity)
	103	return;
	104
	105	#if HAVE_SCHED_SETAFFINITY
	106	ret = pthread_mutex_lock(&affinity_mutex);
	107	if (ret) {
	108	perror("Error in pthread mutex lock");
	109	exit(-1);
	110	}
	111	cpu = cpu_affinities[next_aff++];
	112	ret = pthread_mutex_unlock(&affinity_mutex);
	113	if (ret) {
	114	perror("Error in pthread mutex unlock");
	115	exit(-1);
	116	}
	117
	118	CPU_ZERO(&mask);
	119	CPU_SET(cpu, &mask);
	120	#if SCHED_SETAFFINITY_ARGS == 2
	121	sched_setaffinity(0, &mask);
	122	#else
	123	sched_setaffinity(0, sizeof(mask), &mask);
	124	#endif
	125	#endif /* HAVE_SCHED_SETAFFINITY */
	126	}
	127
	128	/*
	129	* returns 0 if test should end.
	130	*/
	131	static int test_duration_dequeue(void)
	132	{
d05e9936	133	return !test_stop_dequeue;
a5eb5ffc MD	134	}
	135
	136	static int test_duration_enqueue(void)
	137	{
d05e9936	138	return !test_stop_enqueue;
a5eb5ffc MD	139	}
a5eb5ffc MD	140
bd252a04 MD	141	static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
bd252a04 MD	142	static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);
a5eb5ffc	143
bd252a04 MD	144	static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
bd252a04 MD	145	static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);
d05e9936 MD	146	static DEFINE_URCU_TLS(unsigned long long, nr_empty_dest_enqueues);
d05e9936 MD	147	static DEFINE_URCU_TLS(unsigned long long, nr_pop_all);
d89f0c51	148	static DEFINE_URCU_TLS(unsigned long long, nr_pop_last);
a5eb5ffc MD	149
	150	static unsigned int nr_enqueuers;
	151	static unsigned int nr_dequeuers;
	152
16aa9ee8	153	static struct cds_wfs_stack s;
a5eb5ffc	154
98fbc848	155	static void thr_enqueuer(void _count)
a5eb5ffc MD	156	{
a5eb5ffc MD	157	unsigned long long *count = _count;
d05e9936	158	bool was_nonempty;
a5eb5ffc	159
94df6318 MD	160	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	161	"enqueuer", urcu_get_thread_id());
a5eb5ffc MD	162
	163	set_affinity();
	164
a5eb5ffc MD	165	while (!test_go)
	166	{
	167	}
5481ddb3	168	cmm_smp_mb();
a5eb5ffc MD	169
a5eb5ffc MD	170	for (;;) {
16aa9ee8	171	struct cds_wfs_node node = malloc(sizeof(node));
a5eb5ffc MD	172	if (!node)
a5eb5ffc MD	173	goto fail;
16aa9ee8	174	cds_wfs_node_init(node);
d05e9936	175	was_nonempty = cds_wfs_push(&s, node);
bd252a04	176	URCU_TLS(nr_successful_enqueues)++;
d05e9936 MD	177	if (!was_nonempty)
d05e9936 MD	178	URCU_TLS(nr_empty_dest_enqueues)++;
a5eb5ffc	179
a0b7f7ea	180	if (caa_unlikely(wdelay))
a5eb5ffc MD	181	loop_sleep(wdelay);
a5eb5ffc MD	182	fail:
bd252a04	183	URCU_TLS(nr_enqueues)++;
a0b7f7ea	184	if (caa_unlikely(!test_duration_enqueue()))
a5eb5ffc MD	185	break;
	186	}
	187
d05e9936	188	uatomic_inc(&test_enqueue_stopped);
bd252a04 MD	189	count[0] = URCU_TLS(nr_enqueues);
bd252a04 MD	190	count[1] = URCU_TLS(nr_successful_enqueues);
d05e9936	191	count[2] = URCU_TLS(nr_empty_dest_enqueues);
94df6318 MD	192	printf_verbose("enqueuer thread_end, tid %lu, "
	193	"enqueues %llu successful_enqueues %llu, "
	194	"empty_dest_enqueues %llu\n",
	195	urcu_get_thread_id(),
	196	URCU_TLS(nr_enqueues),
	197	URCU_TLS(nr_successful_enqueues),
	198	URCU_TLS(nr_empty_dest_enqueues));
a5eb5ffc MD	199	return ((void*)1);
	200
	201	}
	202
69328034 MD	203	static void do_test_pop(enum test_sync sync)
	204	{
	205	struct cds_wfs_node *node;
d89f0c51	206	int state;
69328034 MD	207
	208	if (sync == TEST_SYNC_MUTEX)
	209	cds_wfs_pop_lock(&s);
d89f0c51	210	node = __cds_wfs_pop_with_state_blocking(&s, &state);
69328034 MD	211	if (sync == TEST_SYNC_MUTEX)
	212	cds_wfs_pop_unlock(&s);
	213
	214	if (node) {
d89f0c51 MD	215	if (state & CDS_WFS_STATE_LAST)
d89f0c51 MD	216	URCU_TLS(nr_pop_last)++;
69328034 MD	217	free(node);
	218	URCU_TLS(nr_successful_dequeues)++;
	219	}
	220	URCU_TLS(nr_dequeues)++;
	221	}
	222
	223	static void do_test_pop_all(enum test_sync sync)
	224	{
	225	struct cds_wfs_head *head;
	226	struct cds_wfs_node node, n;
	227
	228	if (sync == TEST_SYNC_MUTEX)
	229	cds_wfs_pop_lock(&s);
	230	head = __cds_wfs_pop_all(&s);
	231	if (sync == TEST_SYNC_MUTEX)
	232	cds_wfs_pop_unlock(&s);
	233
d05e9936	234	/* Check if empty */
c7ba06ba	235	if (cds_wfs_first(head) == NULL)
d05e9936 MD	236	return;
	237
	238	URCU_TLS(nr_pop_all)++;
d89f0c51	239	URCU_TLS(nr_pop_last)++;
d05e9936	240
69328034 MD	241	cds_wfs_for_each_blocking_safe(head, node, n) {
	242	free(node);
	243	URCU_TLS(nr_successful_dequeues)++;
	244	URCU_TLS(nr_dequeues)++;
	245	}
	246	}
	247
98fbc848	248	static void thr_dequeuer(void _count)
a5eb5ffc MD	249	{
a5eb5ffc MD	250	unsigned long long *count = _count;
f42bc7ef	251	unsigned int counter = 0;
a5eb5ffc	252
94df6318 MD	253	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	254	"dequeuer", urcu_get_thread_id());
a5eb5ffc MD	255
	256	set_affinity();
	257
a5eb5ffc MD	258	while (!test_go)
	259	{
	260	}
5481ddb3	261	cmm_smp_mb();
a5eb5ffc	262
69328034	263	assert(test_pop \|\| test_pop_all);
a5eb5ffc	264
69328034 MD	265	for (;;) {
	266	if (test_pop && test_pop_all) {
	267	if (counter & 1)
	268	do_test_pop(test_sync);
	269	else
	270	do_test_pop_all(test_sync);
	271	counter++;
	272	} else {
	273	if (test_pop)
	274	do_test_pop(test_sync);
	275	else
	276	do_test_pop_all(test_sync);
a5eb5ffc MD	277	}
a5eb5ffc MD	278
a0b7f7ea	279	if (caa_unlikely(!test_duration_dequeue()))
a5eb5ffc	280	break;
a0b7f7ea	281	if (caa_unlikely(rduration))
a5eb5ffc MD	282	loop_sleep(rduration);
	283	}
	284
94df6318 MD	285	printf_verbose("dequeuer thread_end, tid %lu, "
	286	"dequeues %llu, successful_dequeues %llu "
	287	"pop_all %llu pop_last %llu\n",
	288	urcu_get_thread_id(),
	289	URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
	290	URCU_TLS(nr_pop_all),
	291	URCU_TLS(nr_pop_last));
bd252a04 MD	292	count[0] = URCU_TLS(nr_dequeues);
bd252a04 MD	293	count[1] = URCU_TLS(nr_successful_dequeues);
d05e9936	294	count[2] = URCU_TLS(nr_pop_all);
d89f0c51	295	count[3] = URCU_TLS(nr_pop_last);
a5eb5ffc MD	296	return ((void*)2);
	297	}
	298
d89f0c51 MD	299	static void test_end(struct cds_wfs_stack s, unsigned long long nr_dequeues,
d89f0c51 MD	300	unsigned long long *nr_pop_last)
a5eb5ffc	301	{
16aa9ee8	302	struct cds_wfs_node *node;
d89f0c51	303	int state;
a5eb5ffc MD	304
a5eb5ffc MD	305	do {
d89f0c51	306	node = cds_wfs_pop_with_state_blocking(s, &state);
a5eb5ffc	307	if (node) {
d89f0c51 MD	308	if (state & CDS_WFS_STATE_LAST)
d89f0c51 MD	309	(*nr_pop_last)++;
a5eb5ffc MD	310	free(node);
	311	(*nr_dequeues)++;
	312	}
	313	} while (node);
	314	}
	315
98fbc848	316	static void show_usage(int argc, char **argv)
a5eb5ffc	317	{
06637138 MD	318	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s) <OPTIONS>\n",
	319	argv[0]);
	320	printf("OPTIONS:\n");
	321	printf(" [-d delay] (enqueuer period (in loops))\n");
	322	printf(" [-c duration] (dequeuer period (in loops))\n");
	323	printf(" [-v] (verbose output)\n");
	324	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
	325	printf(" [-p] (test pop)\n");
	326	printf(" [-P] (test pop_all, enabled by default)\n");
	327	printf(" [-M] (use mutex external synchronization)\n");
	328	printf(" Note: default: no external synchronization used.\n");
	329	printf(" [-f] (force user-provided synchronization)\n");
	330	printf(" [-w] Wait for dequeuer to empty stack\n");
a5eb5ffc MD	331	printf("\n");
	332	}
	333
	334	int main(int argc, char **argv)
	335	{
	336	int err;
	337	pthread_t tid_enqueuer, tid_dequeuer;
	338	void *tret;
	339	unsigned long long count_enqueuer, count_dequeuer;
	340	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	341	unsigned long long tot_successful_enqueues = 0,
d05e9936 MD	342	tot_successful_dequeues = 0,
d05e9936 MD	343	tot_empty_dest_enqueues = 0,
d89f0c51	344	tot_pop_all = 0, tot_pop_last = 0;
a5eb5ffc	345	unsigned long long end_dequeues = 0;
d05e9936	346	int i, a, retval = 0;
a5eb5ffc MD	347
	348	if (argc < 4) {
	349	show_usage(argc, argv);
	350	return -1;
	351	}
	352
	353	err = sscanf(argv[1], "%u", &nr_dequeuers);
	354	if (err != 1) {
	355	show_usage(argc, argv);
	356	return -1;
	357	}
	358
	359	err = sscanf(argv[2], "%u", &nr_enqueuers);
	360	if (err != 1) {
	361	show_usage(argc, argv);
	362	return -1;
	363	}
	364
	365	err = sscanf(argv[3], "%lu", &duration);
	366	if (err != 1) {
	367	show_usage(argc, argv);
	368	return -1;
	369	}
	370
	371	for (i = 4; i < argc; i++) {
	372	if (argv[i][0] != '-')
	373	continue;
	374	switch (argv[i][1]) {
	375	case 'a':
	376	if (argc < i + 2) {
	377	show_usage(argc, argv);
	378	return -1;
	379	}
	380	a = atoi(argv[++i]);
	381	cpu_affinities[next_aff++] = a;
	382	use_affinity = 1;
	383	printf_verbose("Adding CPU %d affinity\n", a);
	384	break;
	385	case 'c':
	386	if (argc < i + 2) {
	387	show_usage(argc, argv);
	388	return -1;
	389	}
	390	rduration = atol(argv[++i]);
	391	break;
	392	case 'd':
	393	if (argc < i + 2) {
	394	show_usage(argc, argv);
	395	return -1;
	396	}
	397	wdelay = atol(argv[++i]);
	398	break;
	399	case 'v':
	400	verbose_mode = 1;
	401	break;
69328034 MD	402	case 'p':
	403	test_pop = 1;
	404	break;
	405	case 'P':
	406	test_pop_all = 1;
	407	break;
	408	case 'M':
	409	test_sync = TEST_SYNC_MUTEX;
	410	break;
d05e9936 MD	411	case 'w':
	412	test_wait_empty = 1;
	413	break;
0ee400bd MD	414	case 'f':
	415	test_force_sync = 1;
	416	break;
a5eb5ffc MD	417	}
	418	}
	419
69328034 MD	420	/* activate pop_all test by default */
	421	if (!test_pop && !test_pop_all)
	422	test_pop_all = 1;
	423
0ee400bd MD	424	if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_pop) {
	425	if (test_force_sync) {
	426	fprintf(stderr, "[WARNING] Using pop concurrently "
	427	"with other pop or pop_all without external "
	428	"synchronization. Expect run-time failure.\n");
	429	} else {
	430	printf("Enforcing mutex synchronization\n");
	431	test_sync = TEST_SYNC_MUTEX;
	432	}
	433	}
	434
a5eb5ffc MD	435	printf_verbose("running test for %lu seconds, %u enqueuers, "
	436	"%u dequeuers.\n",
	437	duration, nr_enqueuers, nr_dequeuers);
69328034 MD	438	if (test_pop)
	439	printf_verbose("pop test activated.\n");
	440	if (test_pop_all)
	441	printf_verbose("pop_all test activated.\n");
98fbc848 MD	442	if (test_sync == TEST_SYNC_MUTEX)
	443	printf_verbose("External sync: mutex.\n");
	444	else
	445	printf_verbose("External sync: none.\n");
d05e9936 MD	446	if (test_wait_empty)
d05e9936 MD	447	printf_verbose("Wait for dequeuers to empty stack.\n");
a5eb5ffc MD	448	printf_verbose("Writer delay : %lu loops.\n", rduration);
a5eb5ffc MD	449	printf_verbose("Reader duration : %lu loops.\n", wdelay);
94df6318 MD	450	printf_verbose("thread %-6s, tid %lu\n",
94df6318 MD	451	"main", urcu_get_thread_id());
a5eb5ffc	452
9aa14175 MD	453	tid_enqueuer = calloc(nr_enqueuers, sizeof(*tid_enqueuer));
	454	tid_dequeuer = calloc(nr_dequeuers, sizeof(*tid_dequeuer));
	455	count_enqueuer = calloc(nr_enqueuers, 3 * sizeof(*count_enqueuer));
	456	count_dequeuer = calloc(nr_dequeuers, 4 * sizeof(*count_dequeuer));
16aa9ee8	457	cds_wfs_init(&s);
a5eb5ffc MD	458
	459	next_aff = 0;
	460
	461	for (i = 0; i < nr_enqueuers; i++) {
	462	err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
d05e9936	463	&count_enqueuer[3 * i]);
a5eb5ffc MD	464	if (err != 0)
	465	exit(1);
	466	}
	467	for (i = 0; i < nr_dequeuers; i++) {
	468	err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
d89f0c51	469	&count_dequeuer[4 * i]);
a5eb5ffc MD	470	if (err != 0)
	471	exit(1);
	472	}
	473
5481ddb3	474	cmm_smp_mb();
a5eb5ffc MD	475
	476	test_go = 1;
	477
	478	for (i = 0; i < duration; i++) {
	479	sleep(1);
4b665350 MD	480	if (verbose_mode) {
	481	fwrite(".", sizeof(char), 1, stdout);
	482	fflush(stdout);
	483	}
a5eb5ffc MD	484	}
a5eb5ffc MD	485
d05e9936 MD	486	test_stop_enqueue = 1;
	487
	488	if (test_wait_empty) {
	489	while (nr_enqueuers != uatomic_read(&test_enqueue_stopped)) {
	490	sleep(1);
	491	}
	492	while (!cds_wfs_empty(&s)) {
	493	sleep(1);
	494	}
	495	}
	496
	497	test_stop_dequeue = 1;
a5eb5ffc MD	498
	499	for (i = 0; i < nr_enqueuers; i++) {
	500	err = pthread_join(tid_enqueuer[i], &tret);
	501	if (err != 0)
	502	exit(1);
d05e9936 MD	503	tot_enqueues += count_enqueuer[3 * i];
	504	tot_successful_enqueues += count_enqueuer[3 * i + 1];
	505	tot_empty_dest_enqueues += count_enqueuer[3 * i + 2];
a5eb5ffc MD	506	}
	507	for (i = 0; i < nr_dequeuers; i++) {
	508	err = pthread_join(tid_dequeuer[i], &tret);
	509	if (err != 0)
	510	exit(1);
d89f0c51 MD	511	tot_dequeues += count_dequeuer[4 * i];
	512	tot_successful_dequeues += count_dequeuer[4 * i + 1];
	513	tot_pop_all += count_dequeuer[4 * i + 2];
	514	tot_pop_last += count_dequeuer[4 * i + 3];
a5eb5ffc MD	515	}
a5eb5ffc MD	516
d89f0c51	517	test_end(&s, &end_dequeues, &tot_pop_last);
a5eb5ffc MD	518
	519	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
	520	tot_enqueues, tot_dequeues);
	521	printf_verbose("total number of successful enqueues : %llu, "
d05e9936 MD	522	"enqueues to empty dest : %llu, "
d05e9936 MD	523	"successful dequeues %llu, "
d89f0c51	524	"pop_all : %llu, pop_last : %llu\n",
d05e9936 MD	525	tot_successful_enqueues,
	526	tot_empty_dest_enqueues,
	527	tot_successful_dequeues,
d89f0c51	528	tot_pop_all, tot_pop_last);
a5eb5ffc MD	529	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
	530	"nr_dequeuers %3u "
	531	"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
d05e9936 MD	532	"successful enqueues %12llu enqueues to empty dest %12llu "
d05e9936 MD	533	"successful dequeues %12llu pop_all %12llu "
d89f0c51	534	"pop_last %llu end_dequeues %llu nr_ops %12llu\n",
a5eb5ffc MD	535	argv[0], duration, nr_enqueuers, wdelay,
	536	nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
	537	tot_successful_enqueues,
d05e9936	538	tot_empty_dest_enqueues,
d89f0c51 MD	539	tot_successful_dequeues, tot_pop_all, tot_pop_last,
d89f0c51 MD	540	end_dequeues,
a5eb5ffc	541	tot_enqueues + tot_dequeues);
d05e9936	542	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues) {
a5eb5ffc MD	543	printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
	544	"succ. dequeues + end dequeues %llu.\n",
	545	tot_successful_enqueues,
	546	tot_successful_dequeues + end_dequeues);
d05e9936 MD	547	retval = 1;
	548	}
	549	/*
d89f0c51 MD	550	* The enqueuer should see exactly as many empty queues than the
d89f0c51 MD	551	* number of non-empty stacks dequeued.
d05e9936	552	*/
d89f0c51	553	if (tot_empty_dest_enqueues != tot_pop_last) {
d05e9936	554	printf("WARNING! Discrepancy between empty enqueue (%llu) and "
d89f0c51	555	"number of pop last (%llu)\n",
d05e9936	556	tot_empty_dest_enqueues,
d89f0c51	557	tot_pop_last);
d05e9936 MD	558	retval = 1;
d05e9936 MD	559	}
2af1c19e	560	cds_wfs_destroy(&s);
a5eb5ffc MD	561	free(count_enqueuer);
	562	free(count_dequeuer);
	563	free(tid_enqueuer);
	564	free(tid_dequeuer);
d05e9936	565	return retval;
a5eb5ffc	566	}