LLVM  9.0.0svn
Atomic.h
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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
This class represents lattice values for constants.
Definition: AllocatorList.h:23
cas_flag CompareAndSwap(volatile cas_flag *ptr, cas_flag new_value, cas_flag old_value)
Definition: Atomic.cpp:44
void MemoryFence()
Definition: Atomic.cpp:30
uint32_t cas_flag
Definition: Atomic.h:34