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/**********************************************************************
* $Id: cpl_atomic_ops.cpp 19884 2010-06-17 22:01:19Z rouault $
*
* Name: cpl_atomic_ops.cpp
* Project: CPL - Common Portability Library
* Purpose: Atomic operation functions.
* Author: Even Rouault, <even dot rouault at mines dash paris dot org>
*
**********************************************************************
* Copyright (c) 2009, Even Rouault, <even dot rouault at mines dash paris dot org>
*
* 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.
****************************************************************************/
#include "cpl_atomic_ops.h"
#if defined(__MACH__) && defined(__APPLE__)
#include <libkern/OSAtomic.h>
int CPLAtomicAdd(volatile int* ptr, int increment)
{
return OSAtomicAdd32(increment, (int*)(ptr));
}
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
#include <windows.h>
int CPLAtomicAdd(volatile int* ptr, int increment)
{
#if defined(_MSC_VER) && (_MSC_VER <= 1200)
return InterlockedExchangeAdd((LONG*)(ptr), (LONG)(increment)) + increment;
#else
return InterlockedExchangeAdd((volatile LONG*)(ptr), (LONG)(increment)) + increment;
#endif
}
#elif defined(__MINGW32__) && defined(__i386__)
#include <windows.h>
int CPLAtomicAdd(volatile int* ptr, int increment)
{
return InterlockedExchangeAdd((LONG*)(ptr), (LONG)(increment)) + increment;
}
#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
int CPLAtomicAdd(volatile int* ptr, int increment)
{
int temp = increment;
__asm__ __volatile__("lock; xaddl %0,%1"
: "+r" (temp), "+m" (*ptr)
: : "memory");
return temp + increment;
}
#elif defined(HAVE_GCC_ATOMIC_BUILTINS)
/* Starting with GCC 4.1.0, built-in functions for atomic memory access are provided. */
/* see http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html */
/* We use a ./configure test to determine whether this builtins are available */
/* as it appears that the GCC 4.1 version used on debian etch is broken when linking */
/* such instructions... */
int CPLAtomicAdd(volatile int* ptr, int increment)
{
if (increment > 0)
return __sync_add_and_fetch(ptr, increment);
else
return __sync_sub_and_fetch(ptr, -increment);
}
#elif !defined(CPL_MULTIPROC_PTHREAD)
#warning "Needs real lock API to implement properly atomic increment"
/* Dummy implementation */
int CPLAtomicAdd(volatile int* ptr, int increment)
{
(*ptr) += increment;
return *ptr;
}
#else
#include "cpl_multiproc.h"
static void *hAtomicOpMutex = NULL;
/* Slow, but safe, implemenation using a mutex */
int CPLAtomicAdd(volatile int* ptr, int increment)
{
CPLMutexHolder oMutex(&hAtomicOpMutex);
(*ptr) += increment;
return *ptr;
}
#endif
#ifndef HAS_CPL_INLINE
int CPLAtomicInc(volatile int* ptr)
{
return CPLAtomicAdd(ptr, 1);
}
int CPLAtomicDec(volatile int* ptr)
{
return CPLAtomicAdd(ptr, -1);
}
#endif
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