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//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_SUPPORT_ATOMIC_H
15#define LLVM_SUPPORT_ATOMIC_H
16
17#include "llvm/Support/DataTypes.h"
18
19namespace llvm {
20  namespace sys {
21    void MemoryFence();
22
23#ifdef _MSC_VER
24    typedef long cas_flag;
25#else
26    typedef uint32_t cas_flag;
27#endif
28    cas_flag CompareAndSwap(volatile cas_flag* ptr,
29                            cas_flag new_value,
30                            cas_flag old_value);
31    cas_flag AtomicIncrement(volatile cas_flag* ptr);
32    cas_flag AtomicDecrement(volatile cas_flag* ptr);
33    cas_flag AtomicAdd(volatile cas_flag* ptr, cas_flag val);
34    cas_flag AtomicMul(volatile cas_flag* ptr, cas_flag val);
35    cas_flag AtomicDiv(volatile cas_flag* ptr, cas_flag val);
36  }
37}
38
39#endif
40