040000 tree 2796ece60efce9f453540184258d83baae027695	os_sem_init
040000 tree 54f1beff1db377aa26f1ee0a5d54c1eb25689134	os_sem_pend
040000 tree 06b7c52e362b98eae62610d307d18127627ace88	os_sem_release
040000 tree a4ad407604d45d9721b3ac234c9f91077d151b76	semaphore