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

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Linux man-pages 6.9.1          2024-05-02                 sem_destroy(3)

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

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