1 /*
2  * Copyright (C) 2023 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  *
15  * Description: API of message queue thread
16  */
17 
18 #ifndef MSGQUEUETHREAD_H
19 #define MSGQUEUETHREAD_H
20 
21 #include <thread>
22 #include <mutex>
23 #include <condition_variable>
24 #include <functional>
25 #include <map>
26 #include <list>
27 #include "param_bundle.h"
28 
29 using MsgType = int32_t;
30 using MsgId = uint64_t;
31 struct MsgInfo {
32     MsgType type;
33     MsgId id;
34     ParamSP param;
35 };
36 
37 class MsgHandleLoop {
38 protected:
39     MsgHandleLoop();
40     ~MsgHandleLoop();
41     void SendAsyncMsg(MsgType type, const ParamSP &msg, uint32_t delayUs = 0);
42     bool SendSyncMsg(MsgType type, const ParamSP &msg, ParamSP &reply, uint32_t waitMs = 0);
43     virtual void OnMsgReceived(const MsgInfo &info) = 0;
44     void PostReply(MsgId id, const ParamSP &reply);
45     void Stop();
46     static constexpr MsgId ASYNC_MSG_ID = 0;
47     using TimeUs = int64_t;
48     static TimeUs GetNowUs();
49 
50 private:
51     void MainLoop();
52     MsgId GenerateMsgId();
53 
54 private:
55     std::thread m_thread;
56     std::mutex m_mtx;
57     bool m_threadNeedStop = false;
58     MsgId m_lastMsgId = 0;
59     std::map<TimeUs, MsgInfo> m_msgQueue;  // msg will be sorted by timeUs
60     std::condition_variable m_threadCond;
61 
62     std::mutex m_replyMtx;
63     std::map<MsgId, ParamSP> m_replies;
64     std::condition_variable m_replyCond;
65 };
66 
67 
68 #endif
69