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/*
* pthread_spin_lock.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_lock (pthread_spinlock_t * lock)
{
register pthread_spinlock_t s;
if (NULL == lock || NULL == *lock)
{
return (EINVAL);
}
if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
{
int result;
if ((result = ptw32_spinlock_check_need_init (lock)) != 0)
{
return (result);
}
}
s = *lock;
while ((PTW32_INTERLOCKED_LONG) PTW32_SPIN_LOCKED ==
PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG ((PTW32_INTERLOCKED_LONGPTR) &s->interlock,
(PTW32_INTERLOCKED_LONG) PTW32_SPIN_LOCKED,
(PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED))
{
}
if (s->interlock == PTW32_SPIN_LOCKED)
{
return 0;
}
else if (s->interlock == PTW32_SPIN_USE_MUTEX)
{
return pthread_mutex_lock (&(s->u.mutex));
}
return EINVAL;
}
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