1 /*
2 * Copyright (C) 2015 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_TAG "hwc-drm-worker"
18
19 #include "worker.h"
20
21 #include <errno.h>
22 #include <pthread.h>
23 #include <stdlib.h>
24 #include <sys/resource.h>
25 #include <sys/signal.h>
26
27 #include <cutils/log.h>
28
29 namespace android {
30
Worker(const char * name,int priority)31 Worker::Worker(const char *name, int priority)
32 : name_(name), priority_(priority), exit_(false), initialized_(false) {
33 }
34
~Worker()35 Worker::~Worker() {
36 if (!initialized_)
37 return;
38
39 pthread_kill(thread_, SIGTERM);
40 pthread_cond_destroy(&cond_);
41 pthread_mutex_destroy(&lock_);
42 }
43
InitWorker()44 int Worker::InitWorker() {
45 int ret = pthread_cond_init(&cond_, NULL);
46 if (ret) {
47 ALOGE("Failed to int thread %s condition %d", name_.c_str(), ret);
48 return ret;
49 }
50
51 ret = pthread_mutex_init(&lock_, NULL);
52 if (ret) {
53 ALOGE("Failed to init thread %s lock %d", name_.c_str(), ret);
54 pthread_cond_destroy(&cond_);
55 return ret;
56 }
57
58 ret = pthread_create(&thread_, NULL, InternalRoutine, this);
59 if (ret) {
60 ALOGE("Could not create thread %s %d", name_.c_str(), ret);
61 pthread_mutex_destroy(&lock_);
62 pthread_cond_destroy(&cond_);
63 return ret;
64 }
65 initialized_ = true;
66 return 0;
67 }
68
initialized() const69 bool Worker::initialized() const {
70 return initialized_;
71 }
72
Lock()73 int Worker::Lock() {
74 return pthread_mutex_lock(&lock_);
75 }
76
Unlock()77 int Worker::Unlock() {
78 return pthread_mutex_unlock(&lock_);
79 }
80
SignalLocked()81 int Worker::SignalLocked() {
82 return SignalThreadLocked(false);
83 }
84
ExitLocked()85 int Worker::ExitLocked() {
86 int signal_ret = SignalThreadLocked(true);
87 if (signal_ret)
88 ALOGE("Failed to signal thread %s with exit %d", name_.c_str(), signal_ret);
89
90 int join_ret = pthread_join(thread_, NULL);
91 if (join_ret && join_ret != ESRCH)
92 ALOGE("Failed to join thread %s in exit %d", name_.c_str(), join_ret);
93
94 return signal_ret | join_ret;
95 }
96
Signal()97 int Worker::Signal() {
98 int ret = Lock();
99 if (ret) {
100 ALOGE("Failed to acquire lock in Signal() %d\n", ret);
101 return ret;
102 }
103
104 int signal_ret = SignalLocked();
105
106 ret = Unlock();
107 if (ret) {
108 ALOGE("Failed to release lock in Signal() %d\n", ret);
109 return ret;
110 }
111 return signal_ret;
112 }
113
Exit()114 int Worker::Exit() {
115 int ret = Lock();
116 if (ret) {
117 ALOGE("Failed to acquire lock in Exit() %d\n", ret);
118 return ret;
119 }
120
121 int exit_ret = ExitLocked();
122
123 ret = Unlock();
124 if (ret) {
125 ALOGE("Failed to release lock in Exit() %d\n", ret);
126 return ret;
127 }
128 return exit_ret;
129 }
130
WaitForSignalOrExitLocked()131 int Worker::WaitForSignalOrExitLocked() {
132 if (exit_)
133 return -EINTR;
134
135 int ret = pthread_cond_wait(&cond_, &lock_);
136
137 if (exit_)
138 return -EINTR;
139
140 return ret;
141 }
142
143 // static
InternalRoutine(void * arg)144 void *Worker::InternalRoutine(void *arg) {
145 Worker *worker = (Worker *)arg;
146
147 setpriority(PRIO_PROCESS, 0, worker->priority_);
148
149 while (true) {
150 int ret = worker->Lock();
151 if (ret) {
152 ALOGE("Failed to lock %s thread %d", worker->name_.c_str(), ret);
153 continue;
154 }
155
156 bool exit = worker->exit_;
157
158 ret = worker->Unlock();
159 if (ret) {
160 ALOGE("Failed to unlock %s thread %d", worker->name_.c_str(), ret);
161 break;
162 }
163 if (exit)
164 break;
165
166 worker->Routine();
167 }
168 return NULL;
169 }
170
SignalThreadLocked(bool exit)171 int Worker::SignalThreadLocked(bool exit) {
172 if (exit)
173 exit_ = exit;
174
175 int ret = pthread_cond_signal(&cond_);
176 if (ret) {
177 ALOGE("Failed to signal condition on %s thread %d", name_.c_str(), ret);
178 return ret;
179 }
180
181 return 0;
182 }
183 }
184