blob: e19ebf2d616bdfc65e3bf0cc6ba04ccf4d781b61 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.hardware.camera2.legacy;
import android.os.ConditionVariable;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.MessageQueue;
public class RequestHandlerThread extends HandlerThread {
/**
* Ensure that the MessageQueue's idle handler gets run by poking the message queue;
* normally if the message queue is already idle, the idle handler won't get invoked.
*
* <p>Users of this handler thread should ignore this message.</p>
*/
public final static int MSG_POKE_IDLE_HANDLER = -1;
private final ConditionVariable mStarted = new ConditionVariable(false);
private final ConditionVariable mIdle = new ConditionVariable(true);
private Handler.Callback mCallback;
private volatile Handler mHandler;
public RequestHandlerThread(String name, Handler.Callback callback) {
super(name, Thread.MAX_PRIORITY);
mCallback = callback;
}
@Override
protected void onLooperPrepared() {
mHandler = new Handler(getLooper(), mCallback);
mStarted.open();
}
// Blocks until thread has started
public void waitUntilStarted() {
mStarted.block();
}
// May return null if the handler is not set up yet.
public Handler getHandler() {
return mHandler;
}
// Blocks until thread has started
public Handler waitAndGetHandler() {
waitUntilStarted();
return getHandler();
}
// Atomic multi-type message existence check
public boolean hasAnyMessages(int[] what) {
synchronized (mHandler.getLooper().getQueue()) {
for (int i : what) {
if (mHandler.hasMessages(i)) {
return true;
}
}
}
return false;
}
// Atomic multi-type message remove
public void removeMessages(int[] what) {
synchronized (mHandler.getLooper().getQueue()) {
for (int i : what) {
mHandler.removeMessages(i);
}
}
}
private final MessageQueue.IdleHandler mIdleHandler = new MessageQueue.IdleHandler() {
@Override
public boolean queueIdle() {
mIdle.open();
return false;
}
};
// Blocks until thread is idling
public void waitUntilIdle() {
Handler handler = waitAndGetHandler();
MessageQueue queue = handler.getLooper().getQueue();
if (queue.isIdle()) {
return;
}
mIdle.close();
queue.addIdleHandler(mIdleHandler);
// Ensure that the idle handler gets run even if the looper already went idle
handler.sendEmptyMessage(MSG_POKE_IDLE_HANDLER);
if (queue.isIdle()) {
return;
}
mIdle.block();
}
}
|
