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SEM_DESTROY(3P)            POSIX Programmer's Manual           SEM_DESTROY(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       sem_destroy - destroy an unnamed semaphore (REALTIME)
SYNOPSIS
       #include <semaphore.h>
       int sem_destroy(sem_t *sem);

DESCRIPTION
       The sem_destroy() function shall destroy the  unnamed  semaphore  indi-
       cated by sem. Only a semaphore that was created using sem_init() may be
       destroyed using sem_destroy(); the effect of calling sem_destroy() with
       a  named  semaphore  is  undefined. The effect of subsequent use of the
       semaphore sem is undefined until sem is reinitialized by  another  call
       to sem_init().
       It  is  safe  to destroy an initialized semaphore upon which no threads
       are currently blocked. The effect of destroying a semaphore upon  which
       other threads are currently blocked is undefined.
RETURN VALUE
       Upon  successful  completion, a value of zero shall be returned. Other-
       wise, a value of -1 shall be returned and errno  set  to  indicate  the
       error.
ERRORS
       The sem_destroy() function shall fail if:
       EINVAL The sem argument is not a valid semaphore.

       The sem_destroy() function may fail if:
       EBUSY  There are currently processes blocked on the semaphore.

       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       The  sem_destroy()  function  is part of the Semaphores option and need
       not be available on all implementations.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       semctl(), semget(), semop(), sem_init(), sem_open(), the  Base  Defini-
       tions volume of IEEE Std 1003.1-2001, <semaphore.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                      SEM_DESTROY(3P)