X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=test_urcu.c;h=72cceebdd331473d35e516721a9640cf2a3a737f;hp=d5d07fe52daf4d985266f5e2c896e9e4468a1771;hb=af02d47e5d0712e5ccde6d8f1ee89f18de798cad;hpb=ac260fd92d9a3c9170eae13a2766ce37ce9d7cf3

diff --git a/test_urcu.c b/test_urcu.c
index d5d07fe..72cceeb 100644
--- a/test_urcu.c
+++ b/test_urcu.c
@@ -1,9 +1,307 @@
+/*
+ * test_urcu.c
+ *
+ * Userspace RCU library - test program
+ *
+ * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * 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 <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
 #include <stdio.h>
+#include <assert.h>
+#include <sys/syscall.h>
+
+#if defined(_syscall0)
+_syscall0(pid_t, gettid)
+#elif defined(__NR_gettid)
+static inline pid_t gettid(void)
+{
+	return syscall(__NR_gettid);
+}
+#else
+#warning "use pid as tid"
+static inline pid_t gettid(void)
+{
+	return getpid();
+}
+#endif
+
+#ifndef DYNAMIC_LINK_TEST
+#define _LGPL_SOURCE
+#else
+#define debug_yield_read()
+#endif
 #include "urcu.h"
 
+struct test_array {
+	int a;
+};
+
+static int no_writer_delay;
+
+static struct test_array *test_rcu_pointer;
+
+static unsigned long duration;
+static time_t start_time;
+static unsigned long __thread duration_interval;
+#define DURATION_TEST_DELAY_WRITE 4
+#define DURATION_TEST_DELAY_READ 100
+
+/*
+ * returns 0 if test should end.
+ */
+static int test_duration_write(void)
+{
+	if (duration_interval++ >= DURATION_TEST_DELAY_WRITE) {
+		duration_interval = 0;
+		if (time(NULL) - start_time >= duration)
+			return 0;
+	}
+	return 1;
+}
+
+static int test_duration_read(void)
+{
+	if (duration_interval++ >= DURATION_TEST_DELAY_READ) {
+		duration_interval = 0;
+		if (time(NULL) - start_time >= duration)
+			return 0;
+	}
+	return 1;
+}
+
+#define NR_READ 10
+#define NR_WRITE 9
+
+static unsigned long long __thread nr_writes;
+static unsigned long long __thread nr_reads;
+
+pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+void rcu_copy_mutex_lock(void)
+{
+	int ret;
+	ret = pthread_mutex_lock(&rcu_copy_mutex);
+	if (ret) {
+		perror("Error in pthread mutex lock");
+		exit(-1);
+	}
+}
+
+void rcu_copy_mutex_unlock(void)
+{
+	int ret;
+
+	ret = pthread_mutex_unlock(&rcu_copy_mutex);
+	if (ret) {
+		perror("Error in pthread mutex unlock");
+		exit(-1);
+	}
+}
+
+/*
+ * malloc/free are reusing memory areas too quickly, which does not let us
+ * test races appropriately. Use a large circular array for allocations.
+ * ARRAY_SIZE is larger than NR_WRITE, which insures we never run over our tail.
+ */
+#define ARRAY_SIZE (1048576 * NR_WRITE)
+#define ARRAY_POISON 0xDEADBEEF
+static int array_index;
+static struct test_array test_array[ARRAY_SIZE];
+
+static struct test_array *test_array_alloc(void)
+{
+	struct test_array *ret;
+	int index;
+
+	rcu_copy_mutex_lock();
+	index = array_index % ARRAY_SIZE;
+	assert(test_array[index].a == ARRAY_POISON ||
+		test_array[index].a == 0);
+	ret = &test_array[index];
+	array_index++;
+	if (array_index == ARRAY_SIZE)
+		array_index = 0;
+	rcu_copy_mutex_unlock();
+	return ret;
+}
+
+static void test_array_free(struct test_array *ptr)
+{
+	if (!ptr)
+		return;
+	rcu_copy_mutex_lock();
+	ptr->a = ARRAY_POISON;
+	rcu_copy_mutex_unlock();
+}
+
+void *thr_reader(void *_count)
+{
+	unsigned long long *count = _count;
+	struct test_array *local_ptr;
+
+	printf("thread_begin %s, thread id : %lx, tid %lu\n",
+			"reader", pthread_self(), (unsigned long)gettid());
+
+	rcu_register_thread();
+
+	for (;;) {
+		rcu_read_lock();
+		local_ptr = rcu_dereference(test_rcu_pointer);
+		debug_yield_read();
+		if (local_ptr)
+			assert(local_ptr->a == 8);
+		rcu_read_unlock();
+		nr_reads++;
+		if (!test_duration_read())
+			break;
+	}
+
+	rcu_unregister_thread();
+
+	*count = nr_reads;
+	printf("thread_end %s, thread id : %lx, tid %lu\n",
+			"reader", pthread_self(), (unsigned long)gettid());
+	return ((void*)1);
+
+}
 
-int main()
+void *thr_writer(void *_count)
 {
+	unsigned long long *count = _count;
+	struct test_array *new, *old;
+
+	printf("thread_begin %s, thread id : %lx, tid %lu\n",
+			"writer", pthread_self(), (unsigned long)gettid());
+
+	for (;;) {
+		new = test_array_alloc();
+		rcu_copy_mutex_lock();
+		old = test_rcu_pointer;
+		if (old)
+			assert(old->a == 8);
+		new->a = 8;
+		old = rcu_publish_content(&test_rcu_pointer, new);
+		rcu_copy_mutex_unlock();
+		/* can be done after unlock */
+		if (old)
+			old->a = 0;
+		test_array_free(old);
+		nr_writes++;
+		if (!test_duration_write())
+			break;
+		if (!no_writer_delay)
+			usleep(1);
+	}
+
+	printf("thread_end %s, thread id : %lx, tid %lu\n",
+			"writer", pthread_self(), (unsigned long)gettid());
+	*count = nr_writes;
+	return ((void*)2);
+}
+
+void show_usage(int argc, char **argv)
+{
+	printf("Usage : %s duration (s)", argv[0]);
+#ifdef DEBUG_YIELD
+	printf(" [-r] [-w] (yield reader and/or writer)");
+#endif
+	printf(" [-n] (disable writer delay)");
+	printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+	int err;
+	pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE];
+	void *tret;
+	unsigned long long count_reader[NR_READ], count_writer[NR_WRITE];
+	unsigned long long tot_reads = 0, tot_writes = 0;
+	int i;
+
+	if (argc < 2) {
+		show_usage(argc, argv);
+		return -1;
+	}
+
+	err = sscanf(argv[1], "%lu", &duration);
+	if (err != 1) {
+		show_usage(argc, argv);
+		return -1;
+	}
+
+	for (i = 2; i < argc; i++) {
+		if (argv[i][0] != '-')
+			continue;
+		switch (argv[i][1]) {
+#ifdef DEBUG_YIELD
+		case 'r':
+			yield_active |= YIELD_READ;
+			break;
+		case 'w':
+			yield_active |= YIELD_WRITE;
+			break;
+#endif
+		case 'n':
+			no_writer_delay = 1;
+			break;
+		}
+	}
+
+	printf("running test for %lu seconds.\n", duration);
+	start_time = time(NULL);
+	printf("thread %-6s, thread id : %lx, tid %lu\n",
+			"main", pthread_self(), (unsigned long)gettid());
+
+	for (i = 0; i < NR_READ; i++) {
+		err = pthread_create(&tid_reader[i], NULL, thr_reader,
+				     &count_reader[i]);
+		if (err != 0)
+			exit(1);
+	}
+	for (i = 0; i < NR_WRITE; i++) {
+		err = pthread_create(&tid_writer[i], NULL, thr_writer,
+				     &count_writer[i]);
+		if (err != 0)
+			exit(1);
+	}
 
+	for (i = 0; i < NR_READ; i++) {
+		err = pthread_join(tid_reader[i], &tret);
+		if (err != 0)
+			exit(1);
+		tot_reads += count_reader[i];
+	}
+	for (i = 0; i < NR_WRITE; i++) {
+		err = pthread_join(tid_writer[i], &tret);
+		if (err != 0)
+			exit(1);
+		tot_writes += count_writer[i];
+	}
+	
+	printf("total number of reads : %llu, writes %llu\n", tot_reads,
+	       tot_writes);
+	test_array_free(test_rcu_pointer);
 
+	return 0;
 }