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
23namespace llvm {
24  namespace sys {
25    void MemoryFence();
26
27#ifdef _MSC_VER
28    typedef long cas_flag;
29#else
30    typedef uint32_t cas_flag;
31#endif
32    cas_flag CompareAndSwap(volatile cas_flag* ptr,
33                            cas_flag new_value,
34                            cas_flag old_value);
35  }
36}
37
38#endif
39