sem_destroy(3) — Linux manual page


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

       │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 5.08 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

Linux                            2020-08-13                   SEM_DESTROY(3)

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