1 /*
2 * Copyright (C) 2009 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 "rsSignal.h"
18 #include <errno.h>
19
20 namespace android {
21 namespace renderscript {
22
Signal()23 Signal::Signal() {
24 mSet = true;
25 }
26
~Signal()27 Signal::~Signal() {
28 pthread_mutex_destroy(&mMutex);
29 pthread_cond_destroy(&mCondition);
30 }
31
init()32 bool Signal::init() {
33 int status = pthread_mutex_init(&mMutex, nullptr);
34 if (status) {
35 ALOGE("Signal::init: mutex init failure: %s", strerror(status));
36 return false;
37 }
38
39 status = pthread_cond_init(&mCondition, nullptr);
40 if (status) {
41 ALOGE("Signal::init: condition init failure: %s", strerror(status));
42 pthread_mutex_destroy(&mMutex);
43 return false;
44 }
45
46 return true;
47 }
48
set()49 void Signal::set() {
50 int status = pthread_mutex_lock(&mMutex);
51 if (status) {
52 ALOGE("Signal::set: error locking for set condition: %s", strerror(status));
53 return;
54 }
55
56 mSet = true;
57
58 status = pthread_cond_signal(&mCondition);
59 if (status) {
60 ALOGE("Signal::set: error on set condition: %s", strerror(status));
61 }
62
63 status = pthread_mutex_unlock(&mMutex);
64 if (status) {
65 ALOGE("Signal::set: error unlocking for set condition: %s", strerror(status));
66 }
67 }
68
wait()69 void Signal::wait() {
70 int status = pthread_mutex_lock(&mMutex);
71 if (status) {
72 ALOGE("Signal::wait: error locking for condition: %s", strerror(status));
73 return;
74 }
75
76 if (!mSet) {
77 status = pthread_cond_wait(&mCondition, &mMutex);
78 }
79
80 if (!status) {
81 mSet = false;
82 } else {
83 ALOGE("Signal::wait: error waiting for condition: %s", strerror(status));
84 }
85
86 status = pthread_mutex_unlock(&mMutex);
87 if (status) {
88 ALOGE("Signal::wait: error unlocking for condition: %s", strerror(status));
89 }
90 }
91
92 } // namespace renderscript
93 } // namespace android
94