bionic (3) sem_destroy.3posix.gz

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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 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.1‐2008, <semaphore.h>


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