NAME    [Toc]    [Back]

     sem_destroy -- destroy an unnamed semaphore

LIBRARY    [Toc]    [Back]

     Reentrant C Library (libc_r, -lc_r)

SYNOPSIS    [Toc]    [Back]

     #include <semaphore.h>

     int
     sem_destroy(sem_t *sem);

DESCRIPTION    [Toc]    [Back]

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

RETURN VALUES    [Toc]    [Back]

     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    [Toc]    [Back]

     The sem_destroy() function will fail if:

     [EINVAL]		sem points to an invalid semaphore.

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

SEE ALSO    [Toc]    [Back]

     sem_init(3), sem(4)

STANDARDS    [Toc]    [Back]

     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.


FreeBSD 5.2.1		       February 15, 2000		 FreeBSD 5.2.1