1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "WorkerThread.h"
18 
19 #define LOG_NDEBUG 0
20 #define LOG_TAG "EmulatedCamera_WorkerThread"
21 #include <log/log.h>
22 
23 #include <algorithm>
24 
25 namespace android {
26 
WorkerThread(const char * threadName,EmulatedCameraDevice * cameraDevice,EmulatedCamera * cameraHAL)27 WorkerThread::WorkerThread(const char* threadName,
28                            EmulatedCameraDevice* cameraDevice,
29                            EmulatedCamera* cameraHAL)
30     : Thread(true),   // Callbacks may involve Java calls.
31       mCameraDevice(cameraDevice),
32       mCameraHAL(cameraHAL),
33       mRunning(false),
34       mThreadName(threadName) {
35 }
36 
startThread(bool oneBurst)37 status_t WorkerThread::startThread(bool oneBurst) {
38     ALOGV("Starting worker thread, oneBurst=%s", oneBurst ? "true" : "false");
39     mOneBurst = oneBurst;
40     {
41         Mutex::Autolock lock(mRunningMutex);
42         mRunning = true;
43     }
44     return run(mThreadName, ANDROID_PRIORITY_URGENT_DISPLAY, 0);
45 }
46 
stopThread()47 status_t WorkerThread::stopThread() {
48     ALOGV("%s: Stopping worker thread...", __FUNCTION__);
49 
50     Mutex::Autolock lock(mRunningMutex);
51     mRunning = false;
52     mRunningCondition.signal();
53     return NO_ERROR;
54 }
55 
wakeThread()56 status_t WorkerThread::wakeThread() {
57     ALOGV("%s: Waking emulated camera device's worker thread...", __FUNCTION__);
58 
59     mRunningCondition.signal();
60     return NO_ERROR;
61 }
62 
joinThread()63 status_t WorkerThread::joinThread() {
64     return join();
65 }
66 
readyToRun()67 status_t WorkerThread::readyToRun()
68 {
69     status_t res = onThreadStart();
70     if (res != NO_ERROR) {
71         return res;
72     }
73     return NO_ERROR;
74 }
75 
threadLoop()76 bool WorkerThread::threadLoop() {
77     if (inWorkerThread() && !mOneBurst) {
78         /* Only return true if we're running. If mRunning has been set to false
79          * we fall through to ensure that onThreadExit is called. */
80         Mutex::Autolock lock(mRunningMutex);
81         if (mRunning) {
82             return true;
83         }
84     }
85     onThreadExit();
86     ALOGV("%s: Exiting thread, mOneBurst=%s",
87           __FUNCTION__, mOneBurst ? "true" : "false");
88     return false;
89 }
90 
91 }  // namespace android
92 
93