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sem_destroy(3) — Linux manual page

sem_destroy(3)           Library Functions Manualsem_destroy(3)

NAME        top

       sem_destroy - destroy an unnamed semaphore

LIBRARY        top

       POSIX threads library (libpthread,-lpthread)

SYNOPSIS        top

#include <semaphore.h>int sem_destroy(sem_t *sem);

DESCRIPTION        top

sem_destroy() destroys the unnamed semaphore at the address       pointed to bysem.       Only a semaphore that has been initialized bysem_init(3) should       be destroyed usingsem_destroy().       Destroying a semaphore that other processes or threads are       currently blocked on (insem_wait(3)) produces undefined behavior.       Using a semaphore that has been destroyed produces undefined       results, until the semaphore has been reinitialized usingsem_init(3).

RETURN VALUE        top

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

ERRORS        top

EINVALsem is not a valid semaphore.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │sem_destroy()                        │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001.

NOTES        top

       An unnamed semaphore should be destroyed withsem_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 theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17sem_destroy(3)

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

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