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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
  43.