lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 106 insertions, 0 deletions

diff --git a/lib/mlibc/tests/posix/pthread_cond.c b/lib/mlibc/tests/posix/pthread_cond.c
new file mode 100644
index 0000000..6203928
--- /dev/null
+++ b/lib/mlibc/tests/posix/pthread_cond.c
@@ -0,0 +1,106 @@
+#include <assert.h>
+#include <errno.h>
+#include <pthread.h>
+#include <unistd.h>
+
+_Atomic int waiting, should_exit;
+pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
+
+static void *worker(void *arg) {
+	(void)arg;
+	pthread_mutex_lock(&mtx);
+	++waiting;
+	while (!should_exit)
+		pthread_cond_wait(&cond, &mtx);
+	pthread_mutex_unlock(&mtx);
+	return NULL;
+}
+
+static void test_broadcast_wakes_all() {
+	pthread_t t1, t2;
+	pthread_create(&t1, NULL, &worker, NULL);
+	pthread_create(&t2, NULL, &worker, NULL);
+
+	// Wait until the workers have actually entered the cond_wait
+	// before doing a broadcast.
+	while (waiting != 2 || pthread_mutex_trylock(&mtx) == EBUSY)
+		usleep(150000); // 150ms
+
+	should_exit = 1;
+	assert(!pthread_cond_broadcast(&cond));
+	pthread_mutex_unlock(&mtx);
+
+	pthread_join(t1, NULL);
+	pthread_join(t2, NULL);
+}
+
+static void test_timedwait_timedout() {
+	// Use CLOCK_MONOTONIC.
+	pthread_condattr_t attr;
+	pthread_condattr_init(&attr);
+	assert(!pthread_condattr_setclock(&attr, CLOCK_MONOTONIC));
+
+	struct timespec before_now;
+	assert(!clock_gettime(CLOCK_MONOTONIC, &before_now));
+	before_now.tv_nsec -= 10000;
+
+	pthread_mutex_lock(&mtx);
+	int e = pthread_cond_timedwait(&cond, &mtx, &before_now);
+	assert(e == ETIMEDOUT);
+	pthread_mutex_unlock(&mtx);
+
+	long nanos_per_second = 1000000000;
+	struct timespec after_now;
+	assert(!clock_gettime(CLOCK_MONOTONIC, &after_now));
+	after_now.tv_nsec += nanos_per_second / 10; // 100ms
+	if (after_now.tv_nsec >= nanos_per_second) {
+		after_now.tv_nsec -= nanos_per_second;
+		after_now.tv_sec++;
+	}
+
+	pthread_mutex_lock(&mtx);
+	e = pthread_cond_timedwait(&cond, &mtx, &after_now);
+	assert(e == ETIMEDOUT);
+	pthread_mutex_unlock(&mtx);
+
+	after_now.tv_nsec += nanos_per_second;
+	pthread_mutex_lock(&mtx);
+	e = pthread_cond_timedwait(&cond, &mtx, &after_now);
+	assert(e == EINVAL);
+	pthread_mutex_unlock(&mtx);
+}
+
+static void test_attr() {
+	pthread_condattr_t attr;
+	pthread_condattr_init(&attr);
+
+	clockid_t clock;
+	assert(!pthread_condattr_getclock(&attr, &clock));
+	assert(clock == CLOCK_REALTIME);
+	assert(!pthread_condattr_setclock(&attr, CLOCK_MONOTONIC));
+	assert(!pthread_condattr_getclock(&attr, &clock));
+	assert(clock == CLOCK_MONOTONIC);
+
+	int pshared;
+	assert(!pthread_condattr_getpshared(&attr, &pshared));
+	assert(pshared == PTHREAD_PROCESS_PRIVATE);
+	assert(!pthread_condattr_setpshared(&attr, PTHREAD_PROCESS_SHARED));
+	assert(!pthread_condattr_getpshared(&attr, &pshared));
+	assert(pshared == PTHREAD_PROCESS_SHARED);
+
+	pthread_condattr_destroy(&attr);
+	pthread_condattr_init(&attr);
+
+	// Make sure that we can create a pthread_cond_t with an attr.
+	pthread_cond_t cond;
+	pthread_cond_init(&cond, &attr);
+	pthread_cond_destroy(&cond);
+	pthread_condattr_destroy(&attr);
+}
+
+int main() {
+	test_attr();
+	test_broadcast_wakes_all();
+	test_timedwait_timedout();
+}