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Man Pages
SEM_DESTROY(3) FreeBSD Library Functions Manual SEM_DESTROY(3)

sem_destroy
destroy an unnamed semaphore

Standard C Library (libc, -lc)

#include <semaphore.h>
int
sem_destroy(sem_t *sem);

The sem_destroy() 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.

The sem_destroy() function will fail if:
[]
The sem argument points to an invalid semaphore.
[]
There are currently threads blocked on the semaphore that sem points to.

sem_init(3)

The sem_destroy() function 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 15, 2000 FreeBSD 12.0-RELEASE

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