some sugar

main.cpp

@@ -53,6 +53,9 @@ static void tpwriter_worker()
 			const auto cb_fetch = std::bind(&TPWriter::BinlogEventCallback, tpwriter, _1);
 
 			while (!is_term) {
+				// for (unsigned cnt = queue.size(); cnt > 0; --cnt) {
+				// 	tpwriter->BinlogEventCallback(queue.pop());
+				// }
 				queue.try_fetch(cb_fetch, timeout);
 				tpwriter->Sync();
 				tpwriter->RecvAll();

queue.h

@@ -9,65 +9,75 @@
 
 template<typename T> class Queue
 {
+	private:
+		template<typename M> class ulock : public std::unique_lock<M> {
+			std::condition_variable& cv;
+			public:
+			ulock(M& m, std::condition_variable& cv_) : std::unique_lock<M>(m), cv(cv_) {}
+			void unlock() { std::unique_lock<M>::unlock(); cv.notify_all(); }
+		};
+
 	public:
 		Queue(const unsigned limit_) : limit(limit_) {}
 
 		inline T pop()
 		{
-			std::unique_lock<std::mutex> lock(mutex);
+			// std::unique_lock<std::mutex> lock_(mutex);
+			ulock<std::mutex> lock_(mutex, cv2);
 
 			if (queue.empty()) {
-				cv1.wait(lock, [this] { return !queue.empty(); });
+				cv1.wait(lock_, [this] { return !queue.empty(); });
 			}
 
 			T item = queue.front();
 			queue.pop_front();
-			lock.unlock();
-			cv2.notify_all();
+			// lock_.unlock();
+			// cv2.notify_all();
 
 			return item;
 		}
 
-		void try_fetch(const std::function<void (T&)>& cb, const std::chrono::milliseconds timeout)
+		inline void try_fetch(const std::function<void (T&)>& cb, const std::chrono::milliseconds timeout)
 		{
-			std::unique_lock<std::mutex> lock(mutex);
-
-			if (!queue.empty() || cv1.wait_for(lock, timeout, [this] { return !queue.empty(); })) {
-				unsigned cnt = queue.size();
-				do {
-					T item = queue.front();
-					queue.pop_front();
-					lock.unlock();
-					cv2.notify_all();
-
-					cb(item);
-
-					if (--cnt) {
-						lock.lock();
-						continue;
-					}
-				} while (false);
+			// std::unique_lock<std::mutex> lock_(mutex);
+			ulock<std::mutex> lock_(mutex, cv2);
+
+			if (queue.empty() && !cv1.wait_for(lock_, timeout, [this] { return !queue.empty(); })) {
+				return;
 			}
 
-			lock.unlock();
-			cv2.notify_all();
+			unsigned cnt = queue.size();
+			do {
+				T item = queue.front();
+				queue.pop_front();
+				lock_.unlock();
+				//cv2.notify_all();
+
+				cb(item);
+
+				if (--cnt) {
+					lock_.lock();
+					continue;
+				}
+			} while (false);
 		}
 
 		inline void push(const T& item)
 		{
-			std::unique_lock<std::mutex> lock(mutex);
+			// std::unique_lock<std::mutex> lock_(mutex);
+			ulock<std::mutex> lock_(mutex, cv1);
 
 			if (queue.size() >= limit) {
-				cv2.wait(lock, [this] { return queue.size() < limit; });
+				cv2.wait(lock_, [this] { return queue.size() < limit; });
 			}
 
 			queue.push_back(item);
-			lock.unlock();
-			cv1.notify_one();
+			// lock_.unlock();
+			// cv1.notify_one();
 		}
 
 		inline unsigned size() const {
-			// std::lock_guard<std::mutex> lock(mutex);
+			// std::lock_guard<std::mutex> lock_(mutex);
 			return queue.size();
 		}