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SEM_DESTROY(3) Library Functions Manual SEM_DESTROY(3)

sem_destroydestroy an unnamed semaphore

#include <semaphore.h>

sem_destroy(sem_t *sem);

The () function destroys the unnamed semaphore pointed to by sem. After a successful call to sem_destroy(), sem is unusable until re-initialized by another call to sem_init(3).

The sem_destroy() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

sem_destroy() will fail if:

sem points to an invalid semaphore.
There are currently threads blocked on the semaphore that sem points to.

sem_getvalue(3), sem_init(3), sem_open(3), sem_post(3), sem_wait(3)

sem_destroy() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).

POSIX does not define the behavior of sem_destroy() if called while there are threads blocked on sem, but this implementation is guaranteed to return -1 and set errno to EBUSY if there are threads blocked on sem.

February 11, 2023 OpenBSD-current