[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 <errno.h>

#include <urcu/arch.h>
#include <urcu/tls-compat.h>
#include <urcu/uatomic.h>
#include "cpuset.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/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, thread id : %lx, tid %lu\n",
			"enqueuer", (unsigned long) 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);
		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, thread id : %lx, tid %lu, "
		       "enqueues %llu successful_enqueues %llu, "
		       "empty_dest_enqueues %llu\n",
		       pthread_self(),
			(unsigned long) gettid(),
		       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)++;
	}
}

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", (unsigned long) 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, "
		       "nr_splice %llu\n",
		       pthread_self(),
			(unsigned long) gettid(),
		       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)", 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("      Note: default: no external synchronization used.");
	printf(" [-f] (force user-provided synchronization)");
	printf(" [-w] Wait for dequeuer to empty queue");
	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, thread id : %lx, tid %lu\n",
			"main", (unsigned long) pthread_self(),
			(unsigned long) gettid());

	tid_enqueuer = malloc(sizeof(*tid_enqueuer) * nr_enqueuers);
	tid_dequeuer = malloc(sizeof(*tid_dequeuer) * nr_dequeuers);
	count_enqueuer = malloc(3 * sizeof(*count_enqueuer) * nr_enqueuers);
	count_dequeuer = malloc(4 * 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[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)
			write (1, ".", 1);
	}

	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;
	}
	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
	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>
5e70d572 MD	37	#include <errno.h>
	38
	39	#include <urcu/arch.h>
	40	#include <urcu/tls-compat.h>
985c3168	41	#include <urcu/uatomic.h>
2953b501	42	#include "cpuset.h"
5e70d572 MD	43
	44	#ifdef __linux__
	45	#include <syscall.h>
	46	#endif
	47
	48	/* hardcoded number of CPUs */
	49	#define NR_CPUS 16384
	50
	51	#if defined(_syscall0)
	52	_syscall0(pid_t, gettid)
	53	#elif defined(__NR_gettid)
	54	static inline pid_t gettid(void)
	55	{
	56	return syscall(__NR_gettid);
	57	}
	58	#else
	59	#warning "use pid as tid"
	60	static inline pid_t gettid(void)
	61	{
	62	return getpid();
	63	}
	64	#endif
	65
	66	#ifndef DYNAMIC_LINK_TEST
	67	#define _LGPL_SOURCE
	68	#endif
5e70d572 MD	69	#include <urcu/wfcqueue.h>
5e70d572 MD	70
f5d36fed	71	enum test_sync {
372b9ad7 MD	72	TEST_SYNC_NONE = 0,
372b9ad7 MD	73	TEST_SYNC_MUTEX,
f5d36fed MD	74	};
	75
	76	static enum test_sync test_sync;
	77
372b9ad7 MD	78	static int test_force_sync;
372b9ad7 MD	79
cf9451dc	80	static volatile int test_go, test_stop_enqueue, test_stop_dequeue;
5e70d572 MD	81
	82	static unsigned long rduration;
	83
	84	static unsigned long duration;
	85
	86	/* read-side C.S. duration, in loops */
	87	static unsigned long wdelay;
	88
ab0aacbe	89	static inline void loop_sleep(unsigned long loops)
5e70d572	90	{
ab0aacbe	91	while (loops-- != 0)
5e70d572 MD	92	caa_cpu_relax();
	93	}
	94
	95	static int verbose_mode;
	96
cf9451dc MD	97	static int test_dequeue, test_splice, test_wait_empty;
cf9451dc MD	98	static int test_enqueue_stopped;
f5d36fed	99
5e70d572 MD	100	#define printf_verbose(fmt, args...) \
	101	do { \
	102	if (verbose_mode) \
f5d36fed	103	printf(fmt, ## args); \
5e70d572 MD	104	} while (0)
	105
	106	static unsigned int cpu_affinities[NR_CPUS];
	107	static unsigned int next_aff = 0;
	108	static int use_affinity = 0;
	109
	110	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	111
5e70d572 MD	112	static void set_affinity(void)
5e70d572 MD	113	{
95bc7fb9	114	#if HAVE_SCHED_SETAFFINITY
5e70d572	115	cpu_set_t mask;
95bc7fb9 MD	116	int cpu, ret;
95bc7fb9 MD	117	#endif /* HAVE_SCHED_SETAFFINITY */
5e70d572 MD	118
	119	if (!use_affinity)
	120	return;
	121
	122	#if HAVE_SCHED_SETAFFINITY
	123	ret = pthread_mutex_lock(&affinity_mutex);
	124	if (ret) {
	125	perror("Error in pthread mutex lock");
	126	exit(-1);
	127	}
	128	cpu = cpu_affinities[next_aff++];
	129	ret = pthread_mutex_unlock(&affinity_mutex);
	130	if (ret) {
	131	perror("Error in pthread mutex unlock");
	132	exit(-1);
	133	}
	134
	135	CPU_ZERO(&mask);
	136	CPU_SET(cpu, &mask);
	137	#if SCHED_SETAFFINITY_ARGS == 2
	138	sched_setaffinity(0, &mask);
	139	#else
	140	sched_setaffinity(0, sizeof(mask), &mask);
	141	#endif
	142	#endif /* HAVE_SCHED_SETAFFINITY */
	143	}
	144
	145	/*
	146	* returns 0 if test should end.
	147	*/
	148	static int test_duration_dequeue(void)
	149	{
cf9451dc	150	return !test_stop_dequeue;
5e70d572 MD	151	}
	152
	153	static int test_duration_enqueue(void)
	154	{
cf9451dc	155	return !test_stop_enqueue;
5e70d572 MD	156	}
	157
	158	static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
	159	static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);
	160
	161	static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
	162	static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);
cf9451dc MD	163	static DEFINE_URCU_TLS(unsigned long long, nr_empty_dest_enqueues);
cf9451dc MD	164	static DEFINE_URCU_TLS(unsigned long long, nr_splice);
db182e31	165	static DEFINE_URCU_TLS(unsigned long long, nr_dequeue_last);
5e70d572 MD	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	{
5e70d572 MD	175	unsigned long long *count = _count;
cf9451dc	176	bool was_nonempty;
5e70d572 MD	177
5e70d572 MD	178	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
6ff854ac MD	179	"enqueuer", (unsigned long) pthread_self(),
6ff854ac MD	180	(unsigned long) gettid());
5e70d572 MD	181
	182	set_affinity();
	183
	184	while (!test_go)
	185	{
	186	}
	187	cmm_smp_mb();
	188
	189	for (;;) {
	190	struct cds_wfcq_node node = malloc(sizeof(node));
	191	if (!node)
	192	goto fail;
	193	cds_wfcq_node_init(node);
cf9451dc	194	was_nonempty = cds_wfcq_enqueue(&head, &tail, node);
5e70d572	195	URCU_TLS(nr_successful_enqueues)++;
cf9451dc MD	196	if (!was_nonempty)
cf9451dc MD	197	URCU_TLS(nr_empty_dest_enqueues)++;
5e70d572 MD	198
	199	if (caa_unlikely(wdelay))
	200	loop_sleep(wdelay);
	201	fail:
	202	URCU_TLS(nr_enqueues)++;
	203	if (caa_unlikely(!test_duration_enqueue()))
	204	break;
	205	}
	206
cf9451dc	207	uatomic_inc(&test_enqueue_stopped);
5e70d572 MD	208	count[0] = URCU_TLS(nr_enqueues);
5e70d572 MD	209	count[1] = URCU_TLS(nr_successful_enqueues);
cf9451dc	210	count[2] = URCU_TLS(nr_empty_dest_enqueues);
5e70d572	211	printf_verbose("enqueuer thread_end, thread id : %lx, tid %lu, "
cf9451dc MD	212	"enqueues %llu successful_enqueues %llu, "
cf9451dc MD	213	"empty_dest_enqueues %llu\n",
6ff854ac MD	214	pthread_self(),
6ff854ac MD	215	(unsigned long) gettid(),
cf9451dc MD	216	URCU_TLS(nr_enqueues),
	217	URCU_TLS(nr_successful_enqueues),
	218	URCU_TLS(nr_empty_dest_enqueues));
5e70d572 MD	219	return ((void*)1);
	220
	221	}
	222
f5d36fed MD	223	static void do_test_dequeue(enum test_sync sync)
	224	{
	225	struct cds_wfcq_node *node;
db182e31	226	int state;
f5d36fed MD	227
f5d36fed MD	228	if (sync == TEST_SYNC_MUTEX)
db182e31 MD	229	node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
db182e31 MD	230	&state);
f5d36fed	231	else
db182e31 MD	232	node = __cds_wfcq_dequeue_with_state_blocking(&head, &tail,
	233	&state);
	234
	235	if (state & CDS_WFCQ_STATE_LAST)
	236	URCU_TLS(nr_dequeue_last)++;
f5d36fed MD	237
	238	if (node) {
	239	free(node);
	240	URCU_TLS(nr_successful_dequeues)++;
	241	}
	242	URCU_TLS(nr_dequeues)++;
	243	}
	244
	245	static void do_test_splice(enum test_sync sync)
	246	{
	247	struct cds_wfcq_head tmp_head;
	248	struct cds_wfcq_tail tmp_tail;
	249	struct cds_wfcq_node node, n;
cf9451dc	250	enum cds_wfcq_ret ret;
f5d36fed MD	251
	252	cds_wfcq_init(&tmp_head, &tmp_tail);
	253
	254	if (sync == TEST_SYNC_MUTEX)
cf9451dc	255	ret = cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
f5d36fed MD	256	&head, &tail);
f5d36fed MD	257	else
cf9451dc	258	ret = __cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
f5d36fed MD	259	&head, &tail);
f5d36fed MD	260
cf9451dc MD	261	switch (ret) {
	262	case CDS_WFCQ_RET_WOULDBLOCK:
	263	assert(0); /* blocking call */
	264	break;
	265	case CDS_WFCQ_RET_DEST_EMPTY:
	266	URCU_TLS(nr_splice)++;
db182e31	267	URCU_TLS(nr_dequeue_last)++;
cf9451dc MD	268	/* ok */
	269	break;
	270	case CDS_WFCQ_RET_DEST_NON_EMPTY:
	271	assert(0); /* entirely unexpected */
	272	break;
	273	case CDS_WFCQ_RET_SRC_EMPTY:
	274	/* ok, we could even skip iteration on dest if we wanted */
	275	break;
	276	}
	277
f5d36fed MD	278	__cds_wfcq_for_each_blocking_safe(&tmp_head, &tmp_tail, node, n) {
	279	free(node);
	280	URCU_TLS(nr_successful_dequeues)++;
	281	URCU_TLS(nr_dequeues)++;
	282	}
	283	}
	284
	285	static void thr_dequeuer(void _count)
5e70d572 MD	286	{
5e70d572 MD	287	unsigned long long *count = _count;
f5d36fed	288	unsigned int counter;
5e70d572 MD	289
5e70d572 MD	290	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
6ff854ac MD	291	"dequeuer", (unsigned long) pthread_self(),
6ff854ac MD	292	(unsigned long) gettid());
5e70d572 MD	293
	294	set_affinity();
	295
	296	while (!test_go)
	297	{
	298	}
	299	cmm_smp_mb();
	300
	301	for (;;) {
f5d36fed MD	302	if (test_dequeue && test_splice) {
	303	if (counter & 1)
	304	do_test_dequeue(test_sync);
	305	else
	306	do_test_splice(test_sync);
	307	counter++;
	308	} else {
	309	if (test_dequeue)
	310	do_test_dequeue(test_sync);
	311	else
	312	do_test_splice(test_sync);
5e70d572	313	}
5e70d572 MD	314	if (caa_unlikely(!test_duration_dequeue()))
	315	break;
	316	if (caa_unlikely(rduration))
	317	loop_sleep(rduration);
	318	}
	319
	320	printf_verbose("dequeuer thread_end, thread id : %lx, tid %lu, "
cf9451dc MD	321	"dequeues %llu, successful_dequeues %llu, "
cf9451dc MD	322	"nr_splice %llu\n",
6ff854ac MD	323	pthread_self(),
6ff854ac MD	324	(unsigned long) gettid(),
cf9451dc MD	325	URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
cf9451dc MD	326	URCU_TLS(nr_splice));
5e70d572 MD	327	count[0] = URCU_TLS(nr_dequeues);
5e70d572 MD	328	count[1] = URCU_TLS(nr_successful_dequeues);
cf9451dc	329	count[2] = URCU_TLS(nr_splice);
db182e31	330	count[3] = URCU_TLS(nr_dequeue_last);
5e70d572 MD	331	return ((void*)2);
	332	}
	333
db182e31 MD	334	static void test_end(unsigned long long *nr_dequeues,
db182e31 MD	335	unsigned long long *nr_dequeue_last)
5e70d572 MD	336	{
5e70d572 MD	337	struct cds_wfcq_node *node;
db182e31	338	int state;
5e70d572 MD	339
5e70d572 MD	340	do {
db182e31 MD	341	node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
db182e31 MD	342	&state);
5e70d572	343	if (node) {
db182e31 MD	344	if (state & CDS_WFCQ_STATE_LAST)
db182e31 MD	345	(*nr_dequeue_last)++;
5e70d572 MD	346	free(node);
	347	(*nr_dequeues)++;
	348	}
	349	} while (node);
	350	}
	351
f5d36fed	352	static void show_usage(int argc, char **argv)
5e70d572 MD	353	{
	354	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s)", argv[0]);
	355	printf(" [-d delay] (enqueuer period (in loops))");
	356	printf(" [-c duration] (dequeuer period (in loops))");
	357	printf(" [-v] (verbose output)");
	358	printf(" [-a cpu#] [-a cpu#]... (affinity)");
f5d36fed MD	359	printf(" [-q] (test dequeue)");
	360	printf(" [-s] (test splice, enabled by default)");
	361	printf(" [-M] (use mutex external synchronization)");
372b9ad7 MD	362	printf(" Note: default: no external synchronization used.");
372b9ad7 MD	363	printf(" [-f] (force user-provided synchronization)");
cf9451dc	364	printf(" [-w] Wait for dequeuer to empty queue");
5e70d572 MD	365	printf("\n");
	366	}
	367
	368	int main(int argc, char **argv)
	369	{
	370	int err;
	371	pthread_t tid_enqueuer, tid_dequeuer;
	372	void *tret;
	373	unsigned long long count_enqueuer, count_dequeuer;
	374	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	375	unsigned long long tot_successful_enqueues = 0,
cf9451dc MD	376	tot_successful_dequeues = 0,
cf9451dc MD	377	tot_empty_dest_enqueues = 0,
db182e31	378	tot_splice = 0, tot_dequeue_last = 0;
5e70d572	379	unsigned long long end_dequeues = 0;
cf9451dc	380	int i, a, retval = 0;
5e70d572 MD	381
	382	if (argc < 4) {
	383	show_usage(argc, argv);
	384	return -1;
	385	}
	386
	387	err = sscanf(argv[1], "%u", &nr_dequeuers);
	388	if (err != 1) {
	389	show_usage(argc, argv);
	390	return -1;
	391	}
	392
	393	err = sscanf(argv[2], "%u", &nr_enqueuers);
	394	if (err != 1) {
	395	show_usage(argc, argv);
	396	return -1;
	397	}
	398
	399	err = sscanf(argv[3], "%lu", &duration);
	400	if (err != 1) {
	401	show_usage(argc, argv);
	402	return -1;
	403	}
	404
	405	for (i = 4; i < argc; i++) {
	406	if (argv[i][0] != '-')
	407	continue;
	408	switch (argv[i][1]) {
	409	case 'a':
	410	if (argc < i + 2) {
	411	show_usage(argc, argv);
	412	return -1;
	413	}
	414	a = atoi(argv[++i]);
	415	cpu_affinities[next_aff++] = a;
	416	use_affinity = 1;
	417	printf_verbose("Adding CPU %d affinity\n", a);
	418	break;
	419	case 'c':
	420	if (argc < i + 2) {
	421	show_usage(argc, argv);
	422	return -1;
	423	}
	424	rduration = atol(argv[++i]);
	425	break;
	426	case 'd':
	427	if (argc < i + 2) {
	428	show_usage(argc, argv);
	429	return -1;
	430	}
	431	wdelay = atol(argv[++i]);
	432	break;
	433	case 'v':
	434	verbose_mode = 1;
	435	break;
f5d36fed MD	436	case 'q':
	437	test_dequeue = 1;
	438	break;
	439	case 's':
	440	test_splice = 1;
	441	break;
	442	case 'M':
	443	test_sync = TEST_SYNC_MUTEX;
	444	break;
cf9451dc MD	445	case 'w':
	446	test_wait_empty = 1;
	447	break;
372b9ad7 MD	448	case 'f':
	449	test_force_sync = 1;
	450	break;
5e70d572 MD	451	}
	452	}
	453
f5d36fed MD	454	/* activate splice test by default */
	455	if (!test_dequeue && !test_splice)
	456	test_splice = 1;
	457
372b9ad7 MD	458	if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_dequeue) {
	459	if (test_force_sync) {
	460	fprintf(stderr, "[WARNING] Using dequeue concurrently "
	461	"with other dequeue or splice without external "
	462	"synchronization. Expect run-time failure.\n");
	463	} else {
	464	printf("Enforcing mutex synchronization\n");
	465	test_sync = TEST_SYNC_MUTEX;
	466	}
	467	}
	468
5e70d572 MD	469	printf_verbose("running test for %lu seconds, %u enqueuers, "
	470	"%u dequeuers.\n",
	471	duration, nr_enqueuers, nr_dequeuers);
f5d36fed MD	472	if (test_dequeue)
	473	printf_verbose("dequeue test activated.\n");
	474	else
	475	printf_verbose("splice test activated.\n");
	476	if (test_sync == TEST_SYNC_MUTEX)
	477	printf_verbose("External sync: mutex.\n");
	478	else
	479	printf_verbose("External sync: none.\n");
cf9451dc MD	480	if (test_wait_empty)
cf9451dc MD	481	printf_verbose("Wait for dequeuers to empty queue.\n");
5e70d572 MD	482	printf_verbose("Writer delay : %lu loops.\n", rduration);
	483	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	484	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
6ff854ac MD	485	"main", (unsigned long) pthread_self(),
6ff854ac MD	486	(unsigned long) gettid());
5e70d572 MD	487
	488	tid_enqueuer = malloc(sizeof(tid_enqueuer) nr_enqueuers);
	489	tid_dequeuer = malloc(sizeof(tid_dequeuer) nr_dequeuers);
cf9451dc	490	count_enqueuer = malloc(3 * sizeof(count_enqueuer) nr_enqueuers);
db182e31	491	count_dequeuer = malloc(4 * sizeof(count_dequeuer) nr_dequeuers);
5e70d572 MD	492	cds_wfcq_init(&head, &tail);
	493
	494	next_aff = 0;
	495
	496	for (i = 0; i < nr_enqueuers; i++) {
	497	err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
cf9451dc	498	&count_enqueuer[3 * i]);
5e70d572 MD	499	if (err != 0)
	500	exit(1);
	501	}
	502	for (i = 0; i < nr_dequeuers; i++) {
	503	err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
db182e31	504	&count_dequeuer[4 * i]);
5e70d572 MD	505	if (err != 0)
	506	exit(1);
	507	}
	508
	509	cmm_smp_mb();
	510
	511	test_go = 1;
	512
	513	for (i = 0; i < duration; i++) {
	514	sleep(1);
	515	if (verbose_mode)
	516	write (1, ".", 1);
	517	}
	518
cf9451dc MD	519	test_stop_enqueue = 1;
	520
	521	if (test_wait_empty) {
	522	while (nr_enqueuers != uatomic_read(&test_enqueue_stopped)) {
	523	sleep(1);
	524	}
	525	while (!cds_wfcq_empty(&head, &tail)) {
	526	sleep(1);
	527	}
	528	}
	529
	530	test_stop_dequeue = 1;
5e70d572 MD	531
	532	for (i = 0; i < nr_enqueuers; i++) {
	533	err = pthread_join(tid_enqueuer[i], &tret);
	534	if (err != 0)
	535	exit(1);
cf9451dc MD	536	tot_enqueues += count_enqueuer[3 * i];
	537	tot_successful_enqueues += count_enqueuer[3 * i + 1];
	538	tot_empty_dest_enqueues += count_enqueuer[3 * i + 2];
5e70d572 MD	539	}
	540	for (i = 0; i < nr_dequeuers; i++) {
	541	err = pthread_join(tid_dequeuer[i], &tret);
	542	if (err != 0)
	543	exit(1);
db182e31 MD	544	tot_dequeues += count_dequeuer[4 * i];
	545	tot_successful_dequeues += count_dequeuer[4 * i + 1];
	546	tot_splice += count_dequeuer[4 * i + 2];
	547	tot_dequeue_last += count_dequeuer[4 * i + 3];
5e70d572 MD	548	}
5e70d572 MD	549
db182e31	550	test_end(&end_dequeues, &tot_dequeue_last);
5e70d572 MD	551
	552	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
	553	tot_enqueues, tot_dequeues);
	554	printf_verbose("total number of successful enqueues : %llu, "
cf9451dc	555	"enqueues to empty dest : %llu, "
23ae48ef	556	"successful dequeues %llu, "
db182e31	557	"splice : %llu, dequeue_last : %llu\n",
cf9451dc MD	558	tot_successful_enqueues,
	559	tot_empty_dest_enqueues,
	560	tot_successful_dequeues,
db182e31	561	tot_splice, tot_dequeue_last);
5e70d572 MD	562	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
	563	"nr_dequeuers %3u "
	564	"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
cf9451dc MD	565	"successful enqueues %12llu enqueues to empty dest %12llu "
cf9451dc MD	566	"successful dequeues %12llu splice %12llu "
db182e31	567	"dequeue_last %llu "
5e70d572 MD	568	"end_dequeues %llu nr_ops %12llu\n",
	569	argv[0], duration, nr_enqueuers, wdelay,
	570	nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
	571	tot_successful_enqueues,
cf9451dc	572	tot_empty_dest_enqueues,
db182e31 MD	573	tot_successful_dequeues, tot_splice, tot_dequeue_last,
db182e31 MD	574	end_dequeues,
5e70d572	575	tot_enqueues + tot_dequeues);
cf9451dc MD	576
cf9451dc MD	577	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues) {
5e70d572 MD	578	printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
	579	"succ. dequeues + end dequeues %llu.\n",
	580	tot_successful_enqueues,
	581	tot_successful_dequeues + end_dequeues);
cf9451dc MD	582	retval = 1;
cf9451dc MD	583	}
5e70d572	584
cf9451dc MD	585	/*
	586	* If only using splice to dequeue, the enqueuer should see
	587	* exactly as many empty queues than the number of non-empty
	588	* src splice.
	589	*/
db182e31	590	if (tot_empty_dest_enqueues != tot_dequeue_last) {
cf9451dc	591	printf("WARNING! Discrepancy between empty enqueue (%llu) and "
db182e31	592	"number of dequeue of last element (%llu)\n",
cf9451dc	593	tot_empty_dest_enqueues,
db182e31	594	tot_dequeue_last);
cf9451dc MD	595	retval = 1;
cf9451dc MD	596	}
5e70d572 MD	597	free(count_enqueuer);
	598	free(count_dequeuer);
	599	free(tid_enqueuer);
	600	free(tid_dequeuer);
cf9451dc	601	return retval;
5e70d572	602	}