| //===- llvm/Support/Atomic.h - Atomic Operations -----------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file declares the llvm::sys atomic operations. |
| // |
| // DO NOT USE IN NEW CODE! |
| // |
| // New code should always rely on the std::atomic facilities in C++11. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_SUPPORT_ATOMIC_H |
| #define LLVM_SUPPORT_ATOMIC_H |
| |
| #include "llvm/Support/DataTypes.h" |
| |
| // Windows will at times define MemoryFence. |
| #ifdef MemoryFence |
| #undef MemoryFence |
| #endif |
| |
| namespace llvm { |
| namespace sys { |
| void MemoryFence(); |
| |
| #ifdef _MSC_VER |
| typedef long cas_flag; |
| #else |
| typedef uint32_t cas_flag; |
| #endif |
| cas_flag CompareAndSwap(volatile cas_flag* ptr, |
| cas_flag new_value, |
| cas_flag old_value); |
| } |
| } |
| |
| #endif |