1 /*
2 * Copyright (C) 2010 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 //#define LOG_NDEBUG 0
18 #define LOG_TAG "ALooperRoster"
19 #include <utils/Log.h>
20 #include <utils/String8.h>
21
22 #include "ALooperRoster.h"
23
24 #include "ADebug.h"
25 #include "AHandler.h"
26 #include "AMessage.h"
27
28 namespace android {
29
30 static bool verboseStats = false;
31
ALooperRoster()32 ALooperRoster::ALooperRoster()
33 : mNextHandlerID(1) {
34 }
35
registerHandler(const sp<ALooper> looper,const sp<AHandler> & handler)36 ALooper::handler_id ALooperRoster::registerHandler(
37 const sp<ALooper> looper, const sp<AHandler> &handler) {
38 Mutex::Autolock autoLock(mLock);
39
40 if (handler->id() != 0) {
41 CHECK(!"A handler must only be registered once.");
42 return INVALID_OPERATION;
43 }
44
45 HandlerInfo info;
46 info.mLooper = looper;
47 info.mHandler = handler;
48 ALooper::handler_id handlerID = mNextHandlerID++;
49 mHandlers.add(handlerID, info);
50
51 handler->setID(handlerID, looper);
52
53 return handlerID;
54 }
55
unregisterHandler(ALooper::handler_id handlerID)56 void ALooperRoster::unregisterHandler(ALooper::handler_id handlerID) {
57 Mutex::Autolock autoLock(mLock);
58
59 ssize_t index = mHandlers.indexOfKey(handlerID);
60
61 if (index < 0) {
62 return;
63 }
64
65 const HandlerInfo &info = mHandlers.valueAt(index);
66
67 sp<AHandler> handler = info.mHandler.promote();
68
69 if (handler != NULL) {
70 handler->setID(0, NULL);
71 }
72
73 mHandlers.removeItemsAt(index);
74 }
75
unregisterStaleHandlers()76 void ALooperRoster::unregisterStaleHandlers() {
77
78 Vector<sp<ALooper> > activeLoopers;
79 {
80 Mutex::Autolock autoLock(mLock);
81
82 for (size_t i = mHandlers.size(); i > 0;) {
83 i--;
84 const HandlerInfo &info = mHandlers.valueAt(i);
85
86 sp<ALooper> looper = info.mLooper.promote();
87 if (looper == NULL) {
88 ALOGV("Unregistering stale handler %d", mHandlers.keyAt(i));
89 mHandlers.removeItemsAt(i);
90 } else {
91 // At this point 'looper' might be the only sp<> keeping
92 // the object alive. To prevent it from going out of scope
93 // and having ~ALooper call this method again recursively
94 // and then deadlocking because of the Autolock above, add
95 // it to a Vector which will go out of scope after the lock
96 // has been released.
97 activeLoopers.add(looper);
98 }
99 }
100 }
101 }
102
makeFourCC(uint32_t fourcc,char * s)103 static void makeFourCC(uint32_t fourcc, char *s) {
104 s[0] = (fourcc >> 24) & 0xff;
105 if (s[0]) {
106 s[1] = (fourcc >> 16) & 0xff;
107 s[2] = (fourcc >> 8) & 0xff;
108 s[3] = fourcc & 0xff;
109 s[4] = 0;
110 } else {
111 sprintf(s, "%u", fourcc);
112 }
113 }
114
dump(int fd,const Vector<String16> & args)115 void ALooperRoster::dump(int fd, const Vector<String16>& args) {
116 bool clear = false;
117 bool oldVerbose = verboseStats;
118 for (size_t i = 0; i < args.size(); i++) {
119 if (args[i] == String16("-c")) {
120 clear = true;
121 } else if (args[i] == String16("-von")) {
122 verboseStats = true;
123 } else if (args[i] == String16("-voff")) {
124 verboseStats = false;
125 }
126 }
127 String8 s;
128 if (verboseStats && !oldVerbose) {
129 s.append("(verbose stats collection enabled, stats will be cleared)\n");
130 }
131
132 Mutex::Autolock autoLock(mLock);
133 size_t n = mHandlers.size();
134 s.appendFormat(" %zu registered handlers:\n", n);
135
136 for (size_t i = 0; i < n; i++) {
137 s.appendFormat(" %d: ", mHandlers.keyAt(i));
138 HandlerInfo &info = mHandlers.editValueAt(i);
139 sp<ALooper> looper = info.mLooper.promote();
140 if (looper != NULL) {
141 s.append(looper->getName());
142 sp<AHandler> handler = info.mHandler.promote();
143 if (handler != NULL) {
144 handler->mVerboseStats = verboseStats;
145 s.appendFormat(": %u messages processed", handler->mMessageCounter);
146 if (verboseStats) {
147 for (size_t j = 0; j < handler->mMessages.size(); j++) {
148 char fourcc[15];
149 makeFourCC(handler->mMessages.keyAt(j), fourcc);
150 s.appendFormat("\n %s: %u",
151 fourcc,
152 handler->mMessages.valueAt(j));
153 }
154 } else {
155 handler->mMessages.clear();
156 }
157 if (clear || (verboseStats && !oldVerbose)) {
158 handler->mMessageCounter = 0;
159 handler->mMessages.clear();
160 }
161 } else {
162 s.append(": <stale handler>");
163 }
164 } else {
165 s.append("<stale>");
166 }
167 s.append("\n");
168 }
169 write(fd, s.string(), s.size());
170 }
171
172 } // namespace android
173