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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
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 may fail if:
       EINVAL The sem argument is not a valid semaphore.
       EBUSY  There are currently processes blocked on the semaphore.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       semctl(), semget(), semop(), sem_init(), sem_open()
       The Base Definitions volume of POSIX.1-2008, <semaphore.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                      SEM_DESTROY(3P)