posix + tests: use CLOCK_REALTIME where specified by POSIX

Use CLOCK_REALTIME for the default clock source throughout
the POSIX implementation and tests so that we are
consistent with the specification.

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>

lib/posix/options/cond.c

@@ -256,7 +256,7 @@ int pthread_condattr_init(pthread_condattr_t *att)
 		return EINVAL;
 	}
 
-	attr->clock = CLOCK_MONOTONIC;
+	attr->clock = CLOCK_REALTIME;
 	attr->initialized = true;
 
 	return 0;

lib/posix/options/mqueue.c

@@ -263,7 +263,8 @@ int mq_timedsend(mqd_t mqdes, const char *msg_ptr, size_t msg_len,
 		return -1;
 	}
 
-	return send_message(mqd, msg_ptr, msg_len, K_MSEC(timespec_to_timeoutms(abstime)));
+	return send_message(mqd, msg_ptr, msg_len,
+			    K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**
@@ -298,7 +299,8 @@ int mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
 		return -1;
 	}
 
-	return receive_message(mqd, msg_ptr, msg_len, K_MSEC(timespec_to_timeoutms(abstime)));
+	return receive_message(mqd, msg_ptr, msg_len,
+			       K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**

lib/posix/options/mutex.c

@@ -216,7 +216,7 @@ int pthread_mutex_timedlock(pthread_mutex_t *m,
 		return EINVAL;
 	}
 
-	return acquire_mutex(m, K_MSEC(timespec_to_timeoutms(abstime)));
+	return acquire_mutex(m, K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**

lib/posix/options/pthread.c

@@ -1154,7 +1154,8 @@ int pthread_timedjoin_np(pthread_t pthread, void **status, const struct timespec
 		return EINVAL;
 	}
 
-	return pthread_timedjoin_internal(pthread, status, K_MSEC(timespec_to_timeoutms(abstime)));
+	return pthread_timedjoin_internal(
+		pthread, status, K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)));
 }
 
 /**

lib/posix/options/rwlock.c

@@ -211,7 +211,7 @@ int pthread_rwlock_timedrdlock(pthread_rwlock_t *rwlock,
 		return EINVAL;
 	}
 
-	if (read_lock_acquire(rwl, timespec_to_timeoutms(abstime)) != 0U) {
+	if (read_lock_acquire(rwl, timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)) != 0U) {
 		ret = ETIMEDOUT;
 	}
 
@@ -282,7 +282,7 @@ int pthread_rwlock_timedwrlock(pthread_rwlock_t *rwlock,
 		return EINVAL;
 	}
 
-	if (write_lock_acquire(rwl, timespec_to_timeoutms(abstime)) != 0U) {
+	if (write_lock_acquire(rwl, timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)) != 0U) {
 		ret = ETIMEDOUT;
 	}
 

lib/posix/options/semaphore.c

@@ -161,29 +161,12 @@ int sem_post(sem_t *semaphore)
  */
 int sem_timedwait(sem_t *semaphore, struct timespec *abstime)
 {
-	int32_t timeout;
-	struct timespec current;
-	int64_t current_ms, abstime_ms;
-
 	if ((abstime == NULL) || !timespec_is_valid(abstime)) {
 		errno = EINVAL;
 		return -1;
 	}
 
-	if (clock_gettime(CLOCK_REALTIME, &current) < 0) {
-		return -1;
-	}
-
-	abstime_ms = (int64_t)_ts_to_ms(abstime);
-	current_ms = (int64_t)_ts_to_ms(&current);
-
-	if (abstime_ms <= current_ms) {
-		timeout = 0;
-	} else {
-		timeout = (int32_t)(abstime_ms - current_ms);
-	}
-
-	if (k_sem_take(semaphore, K_MSEC(timeout))) {
+	if (k_sem_take(semaphore, K_MSEC(timespec_to_clock_timeoutms(CLOCK_REALTIME, abstime)))) {
 		errno = ETIMEDOUT;
 		return -1;
 	}

tests/lib/c_lib/thrd/src/cnd.c

@@ -71,7 +71,7 @@ static int test_cnd_thread_fn(void *arg)
 	struct libc_cnd_fixture *const fixture = arg;
 
 	if (fixture->do_timedwait) {
-		zassume_ok(clock_gettime(CLOCK_MONOTONIC, &time_point));
+		zassume_ok(clock_gettime(CLOCK_REALTIME, &time_point));
 		timespec_add_ms(&time_point, WAIT_TIME_MS);
 		res = cnd_timedwait(&fixture->cond, &fixture->mutex, &time_point);
 	} else {

tests/posix/common/src/cond.c

@@ -55,7 +55,7 @@ ZTEST(cond, test_pthread_condattr)
 	zassert_ok(pthread_condattr_init(&att));
 
 	zassert_ok(pthread_condattr_getclock(&att, &clock_id), "pthread_condattr_getclock failed");
-	zassert_equal(clock_id, CLOCK_MONOTONIC, "clock attribute not set correctly");
+	zassert_equal(clock_id, CLOCK_REALTIME, "clock attribute not set correctly");
 
 	zassert_ok(pthread_condattr_setclock(&att, CLOCK_REALTIME),
 		   "pthread_condattr_setclock failed");

tests/posix/rwlocks/src/main.c

@@ -86,8 +86,9 @@ ZTEST(posix_rw_locks, test_rw_lock)
 	usleep(USEC_PER_MSEC);
 	LOG_DBG("Parent thread acquiring WR lock again");
 
-	time.tv_sec = 2;
-	time.tv_nsec = 0;
+	zassert_ok(clock_gettime(CLOCK_REALTIME, &time));
+	time.tv_sec += 2;
+
 	ret = pthread_rwlock_timedwrlock(&rwlock, &time);
 	if (ret) {
 		zassert_ok(pthread_rwlock_wrlock(&rwlock), "Failed to acquire write lock");