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| author | Owen Anderson <resistor@mac.com> | 2009-05-14 05:54:36 +0000 |
|---|---|---|
| committer | Owen Anderson <resistor@mac.com> | 2009-05-14 05:54:36 +0000 |
| commit | c082324e1940851f8db720d064d2b31915910d4e (patch) | |
| tree | 939bb10dd02e7173abf2a7312ea5bc83b9f0bac9 /include/llvm/System | |
| parent | a7c9deaa2b1df30808db376bdfcba7f2e54e59d1 (diff) | |
| download | external_llvm-c082324e1940851f8db720d064d2b31915910d4e.zip external_llvm-c082324e1940851f8db720d064d2b31915910d4e.tar.gz external_llvm-c082324e1940851f8db720d064d2b31915910d4e.tar.bz2 | |
Add an Atomic.h to the System library, for providing a platform independent API
to low-level sync operations.
The only one present at the moment is MemoryFence(), and only for the platforms
for which I could easily discern the proper way to do it. If your favorite platform
isn't represented, patches are welcome!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71770 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/System')
| -rw-r--r-- | include/llvm/System/Atomic.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/include/llvm/System/Atomic.h b/include/llvm/System/Atomic.h new file mode 100644 index 0000000..7db31d5 --- /dev/null +++ b/include/llvm/System/Atomic.h @@ -0,0 +1,45 @@ +//===- llvm/System/Atomic.h - Atomic Operations -----------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file declares the llvm::sys atomic operations. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Config/config.h" + +#ifdef __APPLE__ +#include <libkern/OSAtomic.h> +#elif LLVM_ON_WIN32 +#include <windows.h> +#endif + + +#ifndef LLVM_SYSTEM_ATOMIC_H +#define LLVM_SYSTEM_ATOMIC_H + +namespace llvm { + namespace sys { + inline void MemoryFence() { +#if !defined(ENABLE_THREADS) || ENABLE_THREADS == 0 + return; +#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1) + __sync_synchronize(); +#elif defined(__APPLE__) + OSMemoryBarrier(); +#elif defined(LLVM_ON_WIN32) +#warning Memory fence implementation requires Windows 2003 or later. + MemoryBarrier(); +#else +#warning No memory fence implementation found for you platform! +#endif + } + } +} + +#endif
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