sem_destroy(3posix) [linux man page]

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

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 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 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 Definitions 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 Technol-
       ogy -- 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(P)

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 correspond-
       ing 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>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	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 Stan-
       dard 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 .

IEEE
/The Open Group						       2013							   SEM_DESTROY(3P)