1//===- llvm/Support/Atomic.h - Atomic Operations -----------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file declares the llvm::sys atomic operations. 11// 12// DO NOT USE IN NEW CODE! 13// 14// New code should always rely on the std::atomic facilities in C++11. 15// 16//===----------------------------------------------------------------------===// 17 18#ifndef LLVM_SUPPORT_ATOMIC_H 19#define LLVM_SUPPORT_ATOMIC_H 20 21#include "llvm/Support/DataTypes.h" 22 23// Windows will at times define MemoryFence. 24#ifdef MemoryFence 25#undef MemoryFence 26#endif 27 28namespace llvm { 29 namespace sys { 30 void MemoryFence(); 31 32#ifdef _MSC_VER 33 typedef long cas_flag; 34#else 35 typedef uint32_t cas_flag; 36#endif 37 cas_flag CompareAndSwap(volatile cas_flag* ptr, 38 cas_flag new_value, 39 cas_flag old_value); 40 } 41} 42 43#endif 44