// 生产者-消费者模式 无锁队列
get()时,如果deque里面没有元素了,则会一直阻塞,还有待改进的空间
template <class T>
class BlockingQueue {
public:
explicit BlockingQueue() : shutdown_(false) {}
~BlockingQueue() {}
void put(const T& value) {
boost::mutex::scoped_lock lock(mutex_);
dq_.push_back(value);
cv_.notify_one();
}
bool get(T& value) {
boost::mutex::scoped_lock lock(mutex_);
if (!shutdown_ && dq_.empty()) {
cv_.wait(lock);
}
if (shutdown_) {
return false;
}
value = dq_.front();
dq_.pop_front();
return true;
}
void Shutdown() {
boost::mutex::scoped_lock lock(mutex_);
shutdown_ = true;
cv_.notify_all();
}
private:
boost::mutex::scoped_lock mutex_;
bool shutdown_;
boost::condition_variable cv_;
std::deque<T> dq_;
};