int a;
};
+static int no_writer_delay;
+
static struct test_array *test_rcu_pointer;
static unsigned long duration;
}
}
+/*
+ * 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 *arg)
{
- int qparity;
struct test_array *local_ptr;
printf("thread_begin %s, thread id : %lx, tid %lu\n",
urcu_register_thread();
for (;;) {
- rcu_read_lock(&qparity);
+ rcu_read_lock();
local_ptr = rcu_dereference(test_rcu_pointer);
+ debug_yield_read();
if (local_ptr)
assert(local_ptr->a == 8);
- rcu_read_unlock(&qparity);
+ rcu_read_unlock();
if (!test_duration())
break;
}
"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((void **)&test_rcu_pointer, new);
+ old = urcu_publish_content(&test_rcu_pointer, new);
rcu_copy_mutex_unlock();
/* can be done after unlock */
if (old)
old->a = 0;
- free(old);
+ test_array_free(old);
if (!test_duration())
break;
- usleep(1);
+ if (!no_writer_delay)
+ usleep(1);
}
printf("thread_end %s, thread id : %lx, tid %lu\n",
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;
int i;
if (argc < 2) {
- printf("Usage : %s duration (s) [-r] [-w] "
- "(yield reader and/or writer)\n", argv[0]);
+ show_usage(argc, argv);
return -1;
}
err = sscanf(argv[1], "%lu", &duration);
if (err != 1) {
- printf("Usage : %s duration (s) [-r] [-w] "
- "(yield reader and/or writer)\n", argv[0]);
+ show_usage(argc, argv);
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);
if (err != 0)
exit(1);
}
- free(test_rcu_pointer);
+ test_array_free(test_rcu_pointer);
return 0;
}