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71417827e8
use it to implement Atomic.h. This expunges the code previously imported from libatomic_ops. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72077 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.0 KiB
C++
75 lines
2.0 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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#if defined(_MSC_VER)
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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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inline void MemoryFence() {
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#if !defined(ENABLE_THREADS) || ENABLE_THREADS == 0
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# if defined(__GNUC__)
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__asm__ __volatile__("" : : : "memory");
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# elif defined(_MSC_VER)
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__asm { };
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# else
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# error No memory fence implementation for your platform!
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# endif
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#else
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# if defined(__GNUC__)
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__sync_synchronize();
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# elif defined(_MSC_VER)
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MemoryBarrier();
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# else
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# error No memory fence implementation for your platform!
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# endif
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#endif
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}
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#if !defined(ENABLE_THREADS) || ENABLE_THREADS == 0
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typedef unsigned long 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 defined(__GNUC__)
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typedef unsigned long cas_flag;
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inline cas_flag CompareAndSwap(cas_flag* ptr,
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cas_flag new_value,
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cas_flag old_value) {
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return __sync_val_compare_and_swap(ptr, old_value, new_value);
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}
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#elif defined(_MSC_VER) && _M_IX86 > 400
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typedef LONG cas_flag;
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inline cas_flag CompareAndSwap(cas_flag* ptr,
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cas_flag new_value,
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cas_flag old_value) {
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return InterlockedCompareExchange(addr, new_value, old_value);
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}
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#else
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# error No compare-and-swap implementation for your platform!
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#endif
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}
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}
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#endif
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