NAME    [Toc]    [Back]

     sem_destroy - destroy an unnamed semaphore

SYNOPSIS    [Toc]    [Back]

     #include <semaphore.h>

     int
     sem_destroy(sem_t *sem);

DESCRIPTION    [Toc]    [Back]

     The sem_destroy() function destroys  the  unnamed  semaphore
pointed to by
     sem.  After a successful call to sem_destroy(), sem is unusable until reinitialized
 by another call to sem_init().

RETURN VALUES    [Toc]    [Back]

     The sem_destroy() function returns the value 0  if  successful; otherwise
     the  value  -1  is returned and the global variable errno is
set to indicate
     the error.

ERRORS    [Toc]    [Back]

     sem_destroy() will fail if:

     [EINVAL]      sem points to an invalid semaphore.

     [EBUSY]       There are currently  threads  blocked  on  the
semaphore that
                   sem points to.

SEE ALSO    [Toc]    [Back]

     sem_init(3)

STANDARDS    [Toc]    [Back]

     sem_destroy() conforms to ISO/IEC 9945-1:1996 (``POSIX'').

     POSIX  does  not  define  the  behavior  of sem_destroy() if
called while there
     are threads blocked on sem, but this implementation is guaranteed to return
  -1 and set errno to EBUSY if there are threads blocked
on sem.

OpenBSD     3.6                        February     15,      2000