040000 tree 1c1d705460552d5750a81f3c133a7a8561cbd26c	os_sem_init
040000 tree e335982f4e9dde47c8d172fb1037496930452b0c	os_sem_pend
040000 tree 86c4c73594bdf0f0e2dedc0508a13611e56f72c5	os_sem_release
040000 tree 099dbbcecb0a7bf004ab3027cdfb51032bd0ec54	semaphore