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File indexing completed on 2026-05-10 08:44:27
0001 //===- llvm/Support/Atomic.h - Atomic Operations -----------------*- C++ -*-===// 0002 // 0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 0004 // See https://llvm.org/LICENSE.txt for license information. 0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 0006 // 0007 //===----------------------------------------------------------------------===// 0008 // 0009 // This file declares the llvm::sys atomic operations. 0010 // 0011 // DO NOT USE IN NEW CODE! 0012 // 0013 // New code should always rely on the std::atomic facilities in C++11. 0014 // 0015 //===----------------------------------------------------------------------===// 0016 0017 #ifndef LLVM_SUPPORT_ATOMIC_H 0018 #define LLVM_SUPPORT_ATOMIC_H 0019 0020 #include "llvm/Support/DataTypes.h" 0021 0022 // Windows will at times define MemoryFence. 0023 #ifdef MemoryFence 0024 #undef MemoryFence 0025 #endif 0026 0027 namespace llvm { 0028 namespace sys { 0029 void MemoryFence(); 0030 0031 #ifdef _MSC_VER 0032 typedef long cas_flag; 0033 #else 0034 typedef uint32_t cas_flag; 0035 #endif 0036 cas_flag CompareAndSwap(volatile cas_flag* ptr, 0037 cas_flag new_value, 0038 cas_flag old_value); 0039 } 0040 } 0041 0042 #endif
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