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/*
* pthread_mutex_destroy.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* 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:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
int
pthread_mutex_destroy (pthread_mutex_t * mutex)
{
int result = 0;
pthread_mutex_t mx;
/*
* Let the system deal with invalid pointers.
*/
/*
* Check to see if we have something to delete.
*/
if (*mutex < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
{
mx = *mutex;
result = pthread_mutex_trylock (&mx);
/*
* If trylock succeeded and the mutex is not recursively locked it
* can be destroyed.
*/
if (0 == result || ENOTRECOVERABLE == result)
{
if (mx->kind != PTHREAD_MUTEX_RECURSIVE || 1 == mx->recursive_count)
{
/*
* FIXME!!!
* The mutex isn't held by another thread but we could still
* be too late invalidating the mutex below since another thread
* may already have entered mutex_lock and the check for a valid
* *mutex != NULL.
*/
*mutex = NULL;
result = (0 == result)?pthread_mutex_unlock(&mx):0;
if (0 == result)
{
if (mx->robustNode != NULL)
{
free(mx->robustNode);
}
if (!CloseHandle (mx->event))
{
*mutex = mx;
result = EINVAL;
}
else
{
free (mx);
}
}
else
{
/*
* Restore the mutex before we return the error.
*/
*mutex = mx;
}
}
else /* mx->recursive_count > 1 */
{
/*
* The mutex must be recursive and already locked by us (this thread).
*/
mx->recursive_count--; /* Undo effect of pthread_mutex_trylock() above */
result = EBUSY;
}
}
}
else
{
ptw32_mcs_local_node_t node;
/*
* See notes in ptw32_mutex_check_need_init() above also.
*/
ptw32_mcs_lock_acquire(&ptw32_mutex_test_init_lock, &node);
/*
* Check again.
*/
if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
{
/*
* This is all we need to do to destroy a statically
* initialised mutex that has not yet been used (initialised).
* If we get to here, another thread
* waiting to initialise this mutex will get an EINVAL.
*/
*mutex = NULL;
}
else
{
/*
* The mutex has been initialised while we were waiting
* so assume it's in use.
*/
result = EBUSY;
}
ptw32_mcs_lock_release(&node);
}
return (result);
}
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