LLVM 20.0.0git
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
21
22// Windows will at times define MemoryFence.
23#ifdef MemoryFence
24#undef MemoryFence
25#endif
26
27namespace llvm {
28 namespace sys {
29 void MemoryFence();
30
31#ifdef _MSC_VER
32 typedef long cas_flag;
33#else
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
uint32_t cas_flag
Definition: Atomic.h:34
void MemoryFence()
Definition: Atomic.cpp:30
cas_flag CompareAndSwap(volatile cas_flag *ptr, cas_flag new_value, cas_flag old_value)
Definition: Atomic.cpp:44
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18