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Linux 2.6 - man page for sem_destroy (linux section 3)

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 -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 imple-
       mentations.

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

COLOPHON
       This  page  is  part of release 3.55 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					    2012-05-13				   SEM_DESTROY(3)


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