855     pub struct sem_t {
2455 pub const SEM_FAILED: *mut crate::sem_t = 0 as *mut sem_t;
3866     pub fn sem_destroy(sem: *mut sem_t) -> c_int;  in sem_destroy()
3867     pub fn sem_wait(sem: *mut sem_t) -> c_int;  in sem_wait()
3868     pub fn sem_trywait(sem: *mut sem_t) -> c_int;  in sem_trywait()
3869     pub fn sem_post(sem: *mut sem_t) -> c_int;  in sem_post()
3870     pub fn sem_init(sem: *mut sem_t, pshared: c_int, value: c_uint) -> c_int;  in sem_init()  argument
4178     pub fn sem_timedwait(sem: *mut sem_t, abstime: *const crate::timespec) -> c_int;  in sem_timedwait()  argument
4179     pub fn sem_getvalue(sem: *mut sem_t, sval: *mut c_int) -> c_int;  in sem_getvalue()  argument
4240     pub fn sem_close(sem: *mut sem_t) -> c_int;  in sem_close()
4251     pub fn sem_open(name: *const c_char, oflag: c_int, ...) -> *mut sem_t;  in sem_open()  argument