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//===-- Atomic.cpp - 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 header file implements atomic operations.
//
//===----------------------------------------------------------------------===//
#include "llvm/System/Atomic.h"
#include "llvm/Config/config.h"
using namespace llvm;
#if defined(_MSC_VER)
#include <windows.h>
#undef MemoryFence
#endif
void sys::MemoryFence() {
#if LLVM_MULTITHREADED==0
return;
#else
# if defined(__GNUC__)
__sync_synchronize();
# elif defined(_MSC_VER)
MemoryBarrier();
# else
# error No memory fence implementation for your platform!
# endif
#endif
}
sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
sys::cas_flag new_value,
sys::cas_flag old_value) {
#if LLVM_MULTITHREADED==0
sys::cas_flag result = *ptr;
if (result == old_value)
*ptr = new_value;
return result;
#elif defined(__GNUC__)
return __sync_val_compare_and_swap(ptr, old_value, new_value);
#elif defined(_MSC_VER)
return InterlockedCompareExchange(ptr, new_value, old_value);
#else
# error No compare-and-swap implementation for your platform!
#endif
}
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