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/*
* pthread_spin_destroy.c
*
* Description:
* This translation unit implements spin lock 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_spin_destroy (pthread_spinlock_t * lock)
{
register pthread_spinlock_t s;
int result = 0;
if (lock == NULL || *lock == NULL)
{
return EINVAL;
}
if ((s = *lock) != PTHREAD_SPINLOCK_INITIALIZER)
{
if (s->interlock == PTW32_SPIN_USE_MUTEX)
{
result = pthread_mutex_destroy (&(s->u.mutex));
}
else if ((PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED !=
PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG ((PTW32_INTERLOCKED_LONGPTR) &s->interlock,
(PTW32_INTERLOCKED_LONG) PTW32_SPIN_INVALID,
(PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED))
{
result = EINVAL;
}
if (0 == result)
{
/*
* We are relying on the application to ensure that all other threads
* have finished with the spinlock before destroying it.
*/
*lock = NULL;
(void) free (s);
}
}
else
{
/*
* See notes in ptw32_spinlock_check_need_init() above also.
*/
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_spinlock_test_init_lock, &node);
/*
* Check again.
*/
if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
{
/*
* This is all we need to do to destroy a statically
* initialised spinlock that has not yet been used (initialised).
* If we get to here, another thread
* waiting to initialise this mutex will get an EINVAL.
*/
*lock = NULL;
}
else
{
/*
* The spinlock 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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