43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
//===- llvm/Support/Atomic.h - Atomic Operations -----------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys atomic operations.
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//
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// DO NOT USE IN NEW CODE!
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//
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// New code should always rely on the std::atomic facilities in C++11.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ATOMIC_H
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#define LLVM_SUPPORT_ATOMIC_H
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/DataTypes.h"
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// Windows will at times define MemoryFence.
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#ifdef MemoryFence
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#undef MemoryFence
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#endif
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namespace llvm {
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namespace sys {
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LLVM_ABI void MemoryFence();
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#ifdef _MSC_VER
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using cas_flag = long;
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#else
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using cas_flag = uint32_t;
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#endif
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LLVM_ABI cas_flag CompareAndSwap(volatile cas_flag *ptr, cas_flag new_value,
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cas_flag old_value);
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}
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}
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#endif
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