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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), sem(4)

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.

FreeBSD 5.4		       February 15, 2000		   FreeBSD 5.4

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