sem_destroy

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.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).

       +--------------+---------------+---------+
       |Interface     | Attribute     | Value   |
       +--------------+---------------+---------+
       |sem_destroy() | Thread safety | MT-Safe |
       +--------------+---------------+---------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

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 4.15 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.

Linux                             2017-09-15                    SEM_DESTROY(3)
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