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



NAME
       sem_destroy - destroy an unnamed semaphore

SYNOPSIS
       #include <semaphore.h>

       int sem_destroy(sem_t *sem);

       Link with -lrt or -pthread.

DESCRIPTION
       sem_destroy() destroys the unnamed semaphore at the address pointed to by sem.

       Only a semaphore that has been initialized by sem_init(3) should be destroyed using sem_destroy().

       Destroying  a  semaphore  that  other  processes  or threads are currently blocked on (in sem_wait(3)) produces undefined
       behavior.

       Using a semaphore that has been destroyed produces undefined results, until the semaphore has  been  reinitialized  using
       sem_init(3).

RETURN VALUE
       sem_destroy() returns 0 on success; on error, -1 is returned, and errno is set to indicate the error.

ERRORS
       EINVAL sem is not a valid semaphore.

CONFORMING TO
       POSIX.1-2001.

NOTES
       An  unnamed  semaphore  should  be  destroyed with sem_destroy() before the memory in which it is located is deallocated.
       Failure to do this can result in resource leaks on some implementations.

SEE ALSO
       sem_init(3), sem_post(3), sem_wait(3), sem_overview(7)

COLOPHON
       This page is part of release 3.25 of the Linux man-pages project.  A description of the project,  and  information  about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2006-03-25                                             SEM_DESTROY(3)