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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
//===-- Atomic.cpp - Atomic Operations --------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements atomic operations.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Atomic.h"
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#include "llvm/Config/llvm-config.h"
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using namespace llvm;
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#if defined(_MSC_VER)
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#include <intrin.h>
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// We must include windows.h after intrin.h.
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#include <windows.h>
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#undef MemoryFence
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#endif
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#if defined(__GNUC__) || (defined(__IBMCPP__) && __IBMCPP__ >= 1210)
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#define GNU_ATOMICS
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#endif
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void sys::MemoryFence() {
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#if LLVM_HAS_ATOMICS == 0
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return;
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#else
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# if defined(GNU_ATOMICS)
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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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sys::cas_flag sys::CompareAndSwap(volatile sys::cas_flag* ptr,
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sys::cas_flag new_value,
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sys::cas_flag old_value) {
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#if LLVM_HAS_ATOMICS == 0
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sys::cas_flag result = *ptr;
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if (result == old_value)
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*ptr = new_value;
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return result;
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#elif defined(GNU_ATOMICS)
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return __sync_val_compare_and_swap(ptr, old_value, new_value);
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#elif defined(_MSC_VER)
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return InterlockedCompareExchange(ptr, new_value, old_value);
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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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