C:/knet/include/kNet/Atomics.h
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00001 /* Copyright 2010 Jukka Jylänki 00002 00003 Licensed under the Apache License, Version 2.0 (the "License"); 00004 you may not use this file except in compliance with the License. 00005 You may obtain a copy of the License at 00006 00007 http://www.apache.org/licenses/LICENSE-2.0 00008 00009 Unless required by applicable law or agreed to in writing, software 00010 distributed under the License is distributed on an "AS IS" BASIS, 00011 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00012 See the License for the specific language governing permissions and 00013 limitations under the License. */ 00014 #pragma once 00015 00016 #ifdef WIN32 00017 #include <Windows.h> 00018 #endif 00019 00023 // bool CmpXChgPointer(word *dst, word newVal, word cmp); 00024 // Assigns *dst = newVal, but only if *dst == cmp before the assignment. This evaluation is done atomically. 00025 // Returns true if the assignment succeeded. 00026 // Do NOT call this macro with any side expressions on dst, newVal or cmp. 00027 00028 #ifdef WIN32 00029 // See http://msdn.microsoft.com/en-us/library/ms683568(VS.85).aspx 00030 #define CmpXChgPointer(dst, newVal, cmp) (InterlockedCompareExchangePointer((dst), (newVal), (cmp)) == (cmp)) 00031 #else 00032 // See http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Atomic-Builtins.html 00033 #define CmpXChgPointer(dst, newVal, cmp) __sync_bool_compare_and_swap((dst), (cmp), (newVal)) 00034 #endif
