1 /*
2  * Copyright (c) 2020-2021 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 
16 #include "event_handler.h"
17 
18 using namespace std;
19 
20 namespace OHOS {
21 namespace Media {
EventHandler()22 EventHandler::EventHandler() : running_(false)
23 {
24     hdlThrd_ = new thread(EventDispatch, this);
25 }
26 
~EventHandler()27 EventHandler::~EventHandler()
28 {
29     while (!running_) {
30         this_thread::yield();
31     }
32     running_ = false;
33     cv_.notify_all();
34     hdlThrd_->join();
35     delete hdlThrd_;
36 }
37 
IsRunning()38 bool EventHandler::IsRunning()
39 {
40     return running_;
41 }
42 
EventDispatch(EventHandler * hdl)43 void EventHandler::EventDispatch(EventHandler *hdl)
44 {
45     if (hdl == nullptr) {
46         return;
47     }
48     std::unique_lock<std::mutex> lock(hdl->mtx_);
49     hdl->running_ = true;
50     while (hdl->running_) {
51         if (hdl->msgQ_.empty()) {
52             hdl->cv_.wait(lock); // wait for task or exit signal
53         } else {
54             auto mission = hdl->msgQ_.front();
55             hdl->msgQ_.pop();
56             lock.unlock();
57             mission->Exec();
58             delete mission;
59             lock.lock();
60         }
61     }
62     /* Exec all tasks before exit */
63     while (!hdl->msgQ_.empty()) {
64         auto mission = hdl->msgQ_.front();
65         hdl->msgQ_.pop();
66         lock.unlock();
67         mission->Exec();
68         delete mission;
69         lock.lock();
70     }
71 }
72 } // namespace Media
73 } // namespace OHOS