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117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
//===-- Atomic.cpp - 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 header 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 <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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sys::cas_flag sys::AtomicIncrement(volatile sys::cas_flag* ptr) {
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#if LLVM_HAS_ATOMICS == 0
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++(*ptr);
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return *ptr;
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#elif defined(GNU_ATOMICS)
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return __sync_add_and_fetch(ptr, 1);
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#elif defined(_MSC_VER)
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return InterlockedIncrement(ptr);
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#else
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# error No atomic increment implementation for your platform!
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#endif
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}
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sys::cas_flag sys::AtomicDecrement(volatile sys::cas_flag* ptr) {
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#if LLVM_HAS_ATOMICS == 0
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--(*ptr);
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return *ptr;
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#elif defined(GNU_ATOMICS)
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return __sync_sub_and_fetch(ptr, 1);
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#elif defined(_MSC_VER)
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return InterlockedDecrement(ptr);
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#else
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# error No atomic decrement implementation for your platform!
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#endif
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}
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sys::cas_flag sys::AtomicAdd(volatile sys::cas_flag* ptr, sys::cas_flag val) {
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#if LLVM_HAS_ATOMICS == 0
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*ptr += val;
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return *ptr;
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#elif defined(GNU_ATOMICS)
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return __sync_add_and_fetch(ptr, val);
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#elif defined(_MSC_VER)
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return InterlockedExchangeAdd(ptr, val) + val;
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#else
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# error No atomic add implementation for your platform!
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#endif
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}
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sys::cas_flag sys::AtomicMul(volatile sys::cas_flag* ptr, sys::cas_flag val) {
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sys::cas_flag original, result;
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do {
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original = *ptr;
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result = original * val;
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} while (sys::CompareAndSwap(ptr, result, original) != original);
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return result;
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}
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sys::cas_flag sys::AtomicDiv(volatile sys::cas_flag* ptr, sys::cas_flag val) {
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sys::cas_flag original, result;
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do {
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original = *ptr;
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result = original / val;
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} while (sys::CompareAndSwap(ptr, result, original) != original);
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return result;
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}
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