rewrite posix semaphore and mqueue implementation.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1103 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/pthreads/pthread.c

@@ -6,6 +6,10 @@ int pthread_system_init(void)
 {
 	/* initialize key area */
 	pthread_key_system_init();
+	/* initialize posix mqueue */
+	posix_mq_system_init();
+	/* initialize posix semaphore */
+	posix_sem_system_init();
 
 	return 0;
 }