Implement WinNT condition variables, add semaphors

src/thread_null.c

@@ -55,6 +55,43 @@ int bh_mutex_unlock(bh_mutex_t *mutex)
     return -1;
 }
 
+int bh_semaphore_init(bh_semaphore_t *semaphore, int count)
+{
+    (void)semaphore;
+    (void)count;
+    return -1;
+}
+
+void bh_semaphore_destroy(bh_semaphore_t *semaphore)
+{
+    (void)semaphore;
+}
+
+int bh_semaphore_post(bh_semaphore_t *semaphore)
+{
+    (void)semaphore;
+    return -1;
+}
+
+int bh_semaphore_wait(bh_semaphore_t *semaphore)
+{
+    (void)semaphore;
+    return -1;
+}
+
+int bh_semaphore_wait_for(bh_semaphore_t *semaphore,
+                          unsigned long timeout)
+{
+    (void)semaphore;
+    return -1;
+}
+
+int bh_semaphore_try_wait(bh_semaphore_t *semaphore)
+{
+    (void)semaphore;
+    return -1;
+}
+
 int bh_cond_init(bh_cond_t *cond)
 {
     (void)cond;