#if !defined ISO
type sem_t

constant SEM_FAILED

function int sem_close (sem_t*)
function int sem_destroy (sem_t*)
function int sem_getvalue (sem_t*, int*)
function int sem_init (sem_t*, int, unsigned int)
function {sem_t*} sem_open (const char*, int, ...)
function int sem_post (sem_t*)
function int sem_timedwait (sem_t*, const struct timespec*)
function int sem_trywait (sem_t*)
function int sem_unlink (const char*)
function int sem_wait (sem_t*)

# if !defined POSIX
allow-header fcntl.h
allow-header sys/types.h
# endif
allow-header time.h

allow sem_*
allow SEM_*
allow *_t
#endif