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



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

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
       indicated 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.
       Otherwise, 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.1-2017, <semaphore.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                       SEM_DESTROY(3)
