sem_destroy(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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

NAME         top

       sem_destroy - destroy an unnamed semaphore

SYNOPSIS         top

       #include <semaphore.h>

       int sem_destroy(sem_t *sem);

       Link with -pthread.

DESCRIPTION         top

       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         top

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

ERRORS         top

       EINVAL sem is not a valid semaphore.

ATTRIBUTES         top

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

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             Attribute     Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │sem_destroy()                         │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 5.12 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                          2021-03-22                 SEM_DESTROY(3)

Pages that refer to this page: sem_init(3)sem_overview(7)