---

sem_destroy(3) — Linux manual page

sem_destroy(3) Library Functions Manual sem_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 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 │
 └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

 POSIX.1-2008.

HISTORY top

 POSIX.1-2001.

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 the man-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-6.10.tar.gz
 fetched from
 ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
 2025年02月02日. 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 is not
 part of the original manual page), send a mail to
 man-pages@man7.org
Linux man-pages 6.10 2024年07月23日 sem_destroy(3)

---

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

---

---

---