| 1 | //===- llvm/Support/Atomic.h - Atomic Operations -----------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file declares the llvm::sys atomic operations. |
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| 10 | // |
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| 11 | // DO NOT USE IN NEW CODE! |
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| 12 | // |
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| 13 | // New code should always rely on the std::atomic facilities in C++11. |
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| 14 | // |
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| 15 | //===----------------------------------------------------------------------===// |
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| 16 | |
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| 17 | #ifndef LLVM_SUPPORT_ATOMIC_H |
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| 18 | #define LLVM_SUPPORT_ATOMIC_H |
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| 19 | |
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| 20 | #include "llvm/Support/DataTypes.h" |
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| 21 | |
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| 22 | // Windows will at times define MemoryFence. |
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| 23 | #ifdef MemoryFence |
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| 24 | #undef MemoryFence |
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| 25 | #endif |
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| 26 | |
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| 27 | namespace llvm { |
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| 28 | namespace sys { |
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| 29 | void MemoryFence(); |
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| 30 | |
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| 31 | #ifdef _MSC_VER |
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| 32 | typedef long cas_flag; |
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| 33 | #else |
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| 34 | typedef uint32_t cas_flag; |
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| 35 | #endif |
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| 36 | cas_flag CompareAndSwap(volatile cas_flag* ptr, |
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| 37 | cas_flag new_value, |
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| 38 | cas_flag old_value); |
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| 39 | } |
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| 40 | } |
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| 41 | |
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| 42 | #endif |
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| 43 | |
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