void mutex_lock(struct mutex *mutex)
{
assert(mutex->name);
SLOG(LOG_DEBUG, "Locking %s", mutex_name(mutex));
uint64_t const start = bench_event_start();
# ifdef WITH_BENCH
int err = pthread_mutex_trylock(&mutex->mutex);
switch (err) {
case 0:
bench_event_fire(&mutex->lock_for_free);
break;
case EBUSY:
err = pthread_mutex_lock(&mutex->mutex);
break;
default:
// other errors (for lock and trylock) handled below
break;
}
# else
// This was found to be noticably faster (-1% cpu load)
int err = pthread_mutex_lock(&mutex->mutex);
# endif
if (! err) {
bench_event_stop(&mutex->acquiring_lock, start);
SLOG(LOG_DEBUG, "Locked %s", mutex_name(mutex));
} else {
SLOG(LOG_ERR, "Cannot lock %s: %s", mutex_name(mutex), strerror(err));
// so be it
}
}
void mutex_unlock(struct mutex *mutex)
{
assert(mutex->name);
SLOG(LOG_DEBUG, "Unlocking %s", mutex_name(mutex));
int err = pthread_mutex_unlock(&mutex->mutex);
if (err) {
SLOG(LOG_ERR, "Cannot unlock %s : %s", mutex_name(mutex), strerror(err));
}
}
void mutex_unlock(struct mutex *mutex)
{
assert(mutex->name);
SLOG(LOG_DEBUG, "Unlocking %s", mutex_name(mutex));
int const err = pthread_mutex_unlock(&mutex->mutex); // Call directly pthread_mutex_unlock to avoid the logs in mutex_unlock
if (! err) {
SLOG(LOG_DEBUG, "Unlocked %s", mutex_name(mutex));
} else {
SLOG(LOG_ERR, "Cannot unlock %s: %s", mutex_name(mutex), strerror(err));
}
}
void mutex_dtor(struct mutex *mutex)
{
assert(mutex->name);
SLOG(LOG_DEBUG, "Destruct mutex %s", mutex_name(mutex));
(void)pthread_mutex_destroy(&mutex->mutex);
mutex->name = NULL;
}
DECLARE_TEST(mutex, basic) {
mutex_t* mutex;
mutex = mutex_allocate(STRING_CONST("test"));
EXPECT_CONSTSTRINGEQ(mutex_name(mutex), string_const(STRING_CONST("test")));
EXPECT_TRUE(mutex_try_lock(mutex));
EXPECT_TRUE(mutex_lock(mutex));
EXPECT_TRUE(mutex_try_lock(mutex));
EXPECT_TRUE(mutex_lock(mutex));
EXPECT_TRUE(mutex_unlock(mutex));
EXPECT_TRUE(mutex_unlock(mutex));
EXPECT_TRUE(mutex_unlock(mutex));
EXPECT_TRUE(mutex_unlock(mutex));
log_set_suppress(0, ERRORLEVEL_WARNING);
EXPECT_FALSE(mutex_unlock(mutex));
log_set_suppress(0, ERRORLEVEL_INFO);
mutex_signal(mutex);
thread_yield();
EXPECT_TRUE(mutex_try_wait(mutex, 1));
EXPECT_TRUE(mutex_unlock(mutex));
mutex_signal(mutex);
thread_yield();
EXPECT_TRUE(mutex_wait(mutex));
EXPECT_TRUE(mutex_unlock(mutex));
log_set_suppress(0, ERRORLEVEL_WARNING);
EXPECT_FALSE(mutex_try_wait(mutex, 100));
EXPECT_FALSE(mutex_unlock(mutex));
log_set_suppress(0, ERRORLEVEL_INFO);
mutex_signal(mutex);
thread_yield();
EXPECT_TRUE(mutex_try_wait(mutex, 1));
log_set_suppress(0, ERRORLEVEL_WARNING);
EXPECT_FALSE(mutex_try_wait(mutex, 100));
EXPECT_TRUE(mutex_unlock(mutex));
EXPECT_FALSE(mutex_unlock(mutex));
log_set_suppress(0, ERRORLEVEL_INFO);
mutex_deallocate(mutex);
return 0;
}
