sem_destroy(3)             Library Functions Manual             sem_destroy(3)

NAME
       sem_destroy - destroy an unnamed semaphore

LIBRARY
       POSIX threads library (libpthread, -lpthread)

SYNOPSIS
       #include <semaphore.h>

       int sem_destroy(sem_t *sem);

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 |
       +--------------------------------------------+---------------+---------+
STANDARDS
       POSIX.1-2008.

HISTORY
       POSIX.1-2001.

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)

Linux man-pages 6.7               2023-10-31                    sem_destroy(3)