SEM_DESTROY(3) (2020-08-13) 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). allbox; lb lb lb l l l. Interface Attribute Value T{ sem_destroy() T} 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 implementations. SEE ALSO sem_init(3), sem_post(3), sem_wait(3), sem_overview(7) Page 1 Linux (printed 5/17/22) SEM_DESTROY(3) (2020-08-13) SEM_DESTROY(3) COLOPHON This page is part of release 5.10 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 https://www.kernel.org/doc/man-pages/. Page 2 Linux (printed 5/17/22)