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82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
//===- llvm/System/Atomic.h - Atomic Operations -----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYSTEM_ATOMIC_H
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#define LLVM_SYSTEM_ATOMIC_H
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#include <stdint.h>
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#if defined(__APPLE__)
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#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ == 0)
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#include <libkern/OSAtomic.h>
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#endif
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#elif LLVM_ON_WIN32
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#include <windows.h>
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#endif
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namespace llvm {
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namespace sys {
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#if !defined(ENABLE_THREADS) || ENABLE_THREADS == 0
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inline void MemoryFence() {
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return;
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}
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typedef uint32_t cas_flag;
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inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
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cas_flag result = *dest;
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if (result == c)
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*dest = exc;
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return result;
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}
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#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
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inline void MemoryFence() {
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__sync_synchronize();
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}
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typedef volatile uint32_t cas_flag;
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inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
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return __sync_val_compare_and_swap(dest, exc, c);
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}
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#elif defined(__APPLE__)
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inline void MemoryFence() {
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OSMemoryBarrier();
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}
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typedef volatile int32_t cas_flag;
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inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
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cas_flag old = *dest;
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OSAtomicCompareAndSwap32(c, exc, dest);
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return old;
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}
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#elif defined(LLVM_ON_WIN32)
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#warning Memory fence implementation requires Windows 2003 or later.
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inline void MemoryFence() {
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MemoryBarrier();
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}
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typedef volatile long cas_flag;
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inline cas_flag CompareAndSwap(cas_flag* dest, cas_flag exc, cas_flag c) {
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return InterlockedCompareExchange(dest, exc, c);
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}
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#else
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#error No memory atomics implementation for your platform!
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#endif
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}
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}
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#endif |