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SEM_DESTROY(3) - man page online | library functions

Destroy an unnamed semaphore.

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2015-08-08
SEM_DESTROY(3)                      Linux Programmer's Manual                      SEM_DESTROY(3)

NAME sem_destroy - destroy an unnamed semaphore
SYNOPSIS #include <semaphore.h> int sem_destroy(sem_t *sem); Link with -pthread.
DESCRIPTION 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 sem_destroy() returns 0 on success; on error, -1 is returned, and errno is set to indicate the error.
ERRORS EINVAL sem is not a valid semaphore.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────┼───────────────┼─────────┤ │sem_destroy() │ Thread safety │ MT-Safe │ └──────────────┴───────────────┴─────────┘
CONFORMING TO POSIX.1-2001, POSIX.1-2008.
NOTES 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 imple‐ mentations.
SEE ALSO sem_init(3), sem_post(3), sem_wait(3), sem_overview(7)
COLOPHON This page is part of release 4.04 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 http://www.kernel.org/doc/man-pages/.
Linux 2015-08-08 SEM_DESTROY(3)
This manual Reference Other manuals
sem_destroy(3) referred by sem(4freebsd) | sem_init(3) | sem_overview(7)
refer to attributes(7) | sem_init(3) | sem_overview(7) | sem_post(3) | sem_wait(3)