mirror of
https://github.com/c64scene-ar/llvm-6502.git
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84e5cac70a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72088 91177308-0d34-0410-b5e6-96231b3b80d8
93 lines
2.3 KiB
C++
93 lines
2.3 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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template<typename T>
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inline T CompareAndSwap(volatile T* dest,
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T exc, T c) {
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T 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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template<typename T>
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inline T CompareAndSwap(volatile T* ptr,
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T new_value,
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T 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)
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typedef LONG cas_flag;
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template<typename T>
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inline T CompareAndSwap(volatile T* ptr,
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T new_value,
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T old_value) {
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if (sizeof(T) == 4)
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return InterlockedCompareExchange(ptr, new_value, old_value);
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else if (sizeof(T) == 8)
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return InterlockedCompareExchange64(ptr, new_value, old_value);
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else
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assert(0 && "Unsupported compare-and-swap size!");
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}
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template<typename T>
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inline T* CompareAndSwap<T*>(volatile T** ptr,
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T* new_value,
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T* old_value) {
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return InterlockedCompareExchangePtr(ptr, 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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