cpl_atomic_ops.h

/**********************************************************************
 * $Id$
 *
 * Name:     cpl_atomic_ops.h
 * Project:  CPL - Common Portability Library
 * Purpose:  Atomic operation functions.
 * Author:   Even Rouault, <even dot rouault at spatialys.com>
 *
 **********************************************************************
 * Copyright (c) 2009-2010, Even Rouault <even dot rouault at spatialys.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/
 
#ifndef CPL_ATOMIC_OPS_INCLUDED
#define CPL_ATOMIC_OPS_INCLUDED
 
#include "cpl_port.h"
 
CPL_C_START
 
int CPL_DLL CPLAtomicAdd(volatile int *ptr, int increment);
 
#define CPLAtomicInc(ptr) CPLAtomicAdd(ptr, 1)
 
#define CPLAtomicDec(ptr) CPLAtomicAdd(ptr, -1)
 
int CPLAtomicCompareAndExchange(volatile int *ptr, int oldval, int newval);
 
CPL_C_END
 
#endif /* CPL_ATOMIC_OPS_INCLUDED */