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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* Copyright (C) 2009 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.
*/
#include <stdint.h>
#include <errno.h>
#include <sys/types.h>
#include <utils/threads.h>
#include <utils/Timers.h>
#include <utils/Log.h>
#include <binder/IPCThreadState.h>
#include "MessageQueue.h"
namespace android {
void MessageList::insert(const sp<MessageBase>& node)
{
LIST::iterator cur(mList.begin());
LIST::iterator end(mList.end());
while (cur != end) {
if (*node < **cur) {
mList.insert(cur, node);
return;
}
++cur;
}
mList.insert(++end, node);
}
void MessageList::remove(MessageList::LIST::iterator pos)
{
mList.erase(pos);
}
MessageQueue::MessageQueue()
: mInvalidate(false)
{
mInvalidateMessage = new MessageBase(INVALIDATE);
}
MessageQueue::~MessageQueue()
{
}
sp<MessageBase> MessageQueue::waitMessage(nsecs_t timeout)
{
sp<MessageBase> result;
bool again;
do {
const nsecs_t timeoutTime = systemTime() + timeout;
while (true) {
Mutex::Autolock _l(mLock);
nsecs_t now = systemTime();
nsecs_t nextEventTime = -1;
LIST::iterator cur(mMessages.begin());
if (cur != mMessages.end()) {
result = *cur;
}
if (result != 0) {
if (result->when <= now) {
// there is a message to deliver
mMessages.remove(cur);
break;
}
nextEventTime = result->when;
result = 0;
}
// see if we have an invalidate message
if (mInvalidate) {
mInvalidate = false;
mInvalidateMessage->when = now;
result = mInvalidateMessage;
break;
}
if (timeout >= 0) {
if (timeoutTime < now) {
// we timed-out, return a NULL message
result = 0;
break;
}
if (nextEventTime > 0) {
if (nextEventTime > timeoutTime) {
nextEventTime = timeoutTime;
}
} else {
nextEventTime = timeoutTime;
}
}
if (nextEventTime >= 0) {
//ALOGD("nextEventTime = %lld ms", nextEventTime);
if (nextEventTime > 0) {
// we're about to wait, flush the binder command buffer
IPCThreadState::self()->flushCommands();
const nsecs_t reltime = nextEventTime - systemTime();
if (reltime > 0) {
mCondition.waitRelative(mLock, reltime);
}
}
} else {
//ALOGD("going to wait");
// we're about to wait, flush the binder command buffer
IPCThreadState::self()->flushCommands();
mCondition.wait(mLock);
}
}
// here we're not holding the lock anymore
if (result == 0)
break;
again = result->handler();
if (again) {
// the message has been processed. release our reference to it
// without holding the lock.
result->notify();
result = 0;
}
} while (again);
return result;
}
status_t MessageQueue::postMessage(
const sp<MessageBase>& message, nsecs_t relTime, uint32_t flags)
{
return queueMessage(message, relTime, flags);
}
status_t MessageQueue::invalidate() {
Mutex::Autolock _l(mLock);
mInvalidate = true;
mCondition.signal();
return NO_ERROR;
}
status_t MessageQueue::queueMessage(
const sp<MessageBase>& message, nsecs_t relTime, uint32_t flags)
{
Mutex::Autolock _l(mLock);
message->when = systemTime() + relTime;
mMessages.insert(message);
//ALOGD("MessageQueue::queueMessage time = %lld ms", message->when);
//dumpLocked(message);
mCondition.signal();
return NO_ERROR;
}
void MessageQueue::dump(const sp<MessageBase>& message)
{
Mutex::Autolock _l(mLock);
dumpLocked(message);
}
void MessageQueue::dumpLocked(const sp<MessageBase>& message)
{
LIST::const_iterator cur(mMessages.begin());
LIST::const_iterator end(mMessages.end());
int c = 0;
while (cur != end) {
const char tick = (*cur == message) ? '>' : ' ';
ALOGD("%c %d: msg{.what=%08x, when=%lld}",
tick, c, (*cur)->what, (*cur)->when);
++cur;
c++;
}
}
}; // namespace android
|
