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man: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 4.16 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)

/data/webs/external/dokuwiki/data/pages/man/sem_destroy.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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