Yi Kong | 7bf2a68 | 2019-04-18 17:30:49 -0700 | [diff] [blame] | 1 | //===- llvm/Support/Atomic.h - Atomic Operations -----------------*- C++ -*-===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This file declares the llvm::sys atomic operations. |
| 10 | // |
| 11 | // DO NOT USE IN NEW CODE! |
| 12 | // |
| 13 | // New code should always rely on the std::atomic facilities in C++11. |
| 14 | // |
| 15 | //===----------------------------------------------------------------------===// |
| 16 | |
| 17 | #ifndef LLVM_SUPPORT_ATOMIC_H |
| 18 | #define LLVM_SUPPORT_ATOMIC_H |
| 19 | |
| 20 | #include "llvm/Support/DataTypes.h" |
| 21 | |
| 22 | // Windows will at times define MemoryFence. |
| 23 | #ifdef MemoryFence |
| 24 | #undef MemoryFence |
| 25 | #endif |
| 26 | |
| 27 | namespace llvm { |
| 28 | namespace sys { |
| 29 | void MemoryFence(); |
| 30 | |
| 31 | #ifdef _MSC_VER |
| 32 | typedef long cas_flag; |
| 33 | #else |
| 34 | typedef uint32_t cas_flag; |
| 35 | #endif |
| 36 | cas_flag CompareAndSwap(volatile cas_flag* ptr, |
| 37 | cas_flag new_value, |
| 38 | cas_flag old_value); |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | #endif |