*
* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
*
- * Distributed under GPLv2
+ * 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>
}
#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 100
+#define DURATION_TEST_DELAY_WRITE 4
+#define DURATION_TEST_DELAY_READ 100
/*
* returns 0 if test should end.
*/
-static int test_duration(void)
+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) {
+ if (duration_interval++ >= DURATION_TEST_DELAY_READ) {
duration_interval = 0;
if (time(NULL) - start_time >= duration)
return 0;
#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)
}
}
-void *thr_reader(void *arg)
+/*
+ * 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());
- urcu_register_thread();
+ 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();
- if (!test_duration())
+ nr_reads++;
+ if (!test_duration_read())
break;
}
- urcu_unregister_thread();
+ 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);
}
-void *thr_writer(void *arg)
+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 = malloc(sizeof(struct test_array));
+ new = test_array_alloc();
rcu_copy_mutex_lock();
old = test_rcu_pointer;
if (old)
assert(old->a == 8);
new->a = 8;
- old = urcu_publish_content(&test_rcu_pointer, new);
+ old = rcu_publish_content(&test_rcu_pointer, new);
rcu_copy_mutex_unlock();
/* can be done after unlock */
if (old)
old->a = 0;
- free(old);
- if (!test_duration())
+ test_array_free(old);
+ nr_writes++;
+ if (!test_duration_write())
break;
- usleep(1);
+ 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);
}
#ifdef DEBUG_YIELD
printf(" [-r] [-w] (yield reader and/or writer)");
#endif
+ printf(" [-n] (disable writer delay)");
printf("\n");
}
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) {
return -1;
}
-#ifdef DEBUG_YIELD
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;
}
}
-#endif
printf("running test for %lu seconds.\n", duration);
start_time = time(NULL);
"main", pthread_self(), (unsigned long)gettid());
for (i = 0; i < NR_READ; i++) {
- err = pthread_create(&tid_reader[i], NULL, thr_reader, NULL);
+ 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, NULL);
+ err = pthread_create(&tid_writer[i], NULL, thr_writer,
+ &count_writer[i]);
if (err != 0)
exit(1);
}
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];
}
- free(test_rcu_pointer);
+
+ printf("total number of reads : %llu, writes %llu\n", tot_reads,
+ tot_writes);
+ test_array_free(test_rcu_pointer);
return 0;
}
projects / urcu.git / blobdiff