? ? ? ? ?Atomic是muduo原子操作的實現類。

Atomic.h

// Use of this source code is governed by a BSD-style license // that can be found in the License file. // // Author: Shuo Chen (chenshuo at chenshuo dot com)#ifndef MUDUO_BASE_ATOMIC_H #define MUDUO_BASE_ATOMIC_H#include "muduo/base/noncopyable.h"#include <stdint.h>namespace muduo {namespace detail { template<typename T> //可以根據你所需要的類型就行匹配。其實就是模板 class AtomicIntegerT : noncopyable {public:AtomicIntegerT(): value_(0){}// uncomment if you need copying and assignment//// AtomicIntegerT(const AtomicIntegerT& that)// : value_(that.get())// {}//// AtomicIntegerT& operator=(const AtomicIntegerT& that)// {// getAndSet(that.get());// return *this;// }T get(){// in gcc >= 4.7: __atomic_load_n(&value_, __ATOMIC_SEQ_CST)return __sync_val_compare_and_swap(&value_, 0, 0);}T getAndAdd(T x){// in gcc >= 4.7: __atomic_fetch_add(&value_, x, __ATOMIC_SEQ_CST)return __sync_fetch_and_add(&value_, x);}T addAndGet(T x){return getAndAdd(x) + x;}T incrementAndGet(){return addAndGet(1);}T decrementAndGet(){return addAndGet(-1);}void add(T x){getAndAdd(x);}void increment(){incrementAndGet();}void decrement(){decrementAndGet();}T getAndSet(T newValue){// in gcc >= 4.7: __atomic_exchange_n(&value, newValue, __ATOMIC_SEQ_CST)return __sync_lock_test_and_set(&value_, newValue);}private:volatile T value_; }; } // namespace detailtypedef detail::AtomicIntegerT<int32_t> AtomicInt32; typedef detail::AtomicIntegerT<int64_t> AtomicInt64;} // namespace muduo#endif // MUDUO_BASE_ATOMIC_H

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