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sem_destroy.c    145 lines (131 with data), 4.7 kB

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/*
* -------------------------------------------------------------
*
* Module: sem_destroy.c
*
* Purpose:
* Semaphores aren't actually part of the PThreads standard.
* They are defined by the POSIX Standard:
*
* POSIX 1003.1b-1993 (POSIX.1b)
*
* -------------------------------------------------------------
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "semaphore.h"
#include "implement.h"
int
sem_destroy (sem_t * sem)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function destroys an unnamed semaphore.
*
* PARAMETERS
* sem
* pointer to an instance of sem_t
*
* DESCRIPTION
* This function destroys an unnamed semaphore.
*
* RESULTS
* 0 successfully destroyed semaphore,
* -1 failed, error in errno
* ERRNO
* EINVAL 'sem' is not a valid semaphore,
* ENOSYS semaphores are not supported,
* EBUSY threads (or processes) are currently
* blocked on 'sem'
*
* ------------------------------------------------------
*/
{
int result = 0;
sem_t s = NULL;
if (sem == NULL || *sem == NULL)
{
result = EINVAL;
}
else
{
s = *sem;
if ((result = pthread_mutex_lock (&s->lock)) == 0)
{
if (s->value < 0)
{
(void) pthread_mutex_unlock (&s->lock);
result = EBUSY;
}
else
{
/* There are no threads currently blocked on this semaphore. */
if (!CloseHandle (s->sem))
{
(void) pthread_mutex_unlock (&s->lock);
result = EINVAL;
}
else
{
/*
* Invalidate the semaphore handle when we have the lock.
* Other sema operations should test this after acquiring the lock
* to check that the sema is still valid, i.e. before performing any
* operations. This may only be necessary before the sema op routine
* returns so that the routine can return EINVAL - e.g. if setting
* s->value to SEM_VALUE_MAX below does force a fall-through.
*/
*sem = NULL;
/* Prevent anyone else actually waiting on or posting this sema.
*/
s->value = SEM_VALUE_MAX;
(void) pthread_mutex_unlock (&s->lock);
do
{
/* Give other threads a chance to run and exit any sema op
* routines. Due to the SEM_VALUE_MAX value, if sem_post or
* sem_wait were blocked by us they should fall through.
*/
Sleep(0);
}
while (pthread_mutex_destroy (&s->lock) == EBUSY);
}
}
}
}
if (result != 0)
{
errno = result;
return -1;
}
free (s);
return 0;
} /* sem_destroy */