freebsd man page for sem_destroy

SEM_DESTROY(3)						   BSD Library Functions Manual 					    SEM_DESTROY(3)

NAME
     sem_destroy -- destroy an unnamed semaphore

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <semaphore.h>

     int
     sem_destroy(sem_t *sem);

DESCRIPTION
     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).

RETURN VALUES
     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.

ERRORS
     The sem_destroy() function will fail if:

     [EINVAL]		The sem argument points to an invalid semaphore.

     [EBUSY]		There are currently threads blocked on the semaphore that sem points to.

SEE ALSO
     sem_init(3)

STANDARDS
     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.

BSD
								 February 15, 2000							       BSD