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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 namespace 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