Implement WinNT condition variables, add semaphors

src/thread_posix.c

@@ -87,6 +87,42 @@ int bh_mutex_unlock(bh_mutex_t *mutex)
     return pthread_mutex_unlock(&mutex->handle);
 }
 
+int bh_semaphore_init(bh_semaphore_t *semaphore, int count)
+{
+    return sem_init(&semaphore->handle, 0, count);
+}
+
+void bh_semaphore_destroy(bh_semaphore_t *semaphore)
+{
+    sem_destroy(&semaphore->handle);
+}
+
+int bh_semaphore_post(bh_semaphore_t *semaphore)
+{
+    return sem_post(&semaphore->handle);
+}
+
+int bh_semaphore_wait(bh_semaphore_t *semaphore)
+{
+    return sem_wait(&semaphore->handle);
+}
+
+int bh_semaphore_wait_for(bh_semaphore_t *semaphore,
+                          unsigned long timeout)
+{
+    struct timespec ts;
+
+    ts.tv_sec = timeout / 1000;
+    ts.tv_nsec = (timeout - ts.tv_sec * 1000) * 1000000;
+
+    return sem_timedwait(&semaphore->handle, &ts);
+}
+
+int bh_semaphore_try_wait(bh_semaphore_t *semaphore)
+{
+    return sem_trywait(&semaphore->handle);
+}
+
 int bh_cond_init(bh_cond_t *cond)
 {
     return pthread_cond_init(&cond->handle, NULL);