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
20namespace android {
21namespace renderscript {
22
23Signal::Signal() {
24    mSet = true;
25}
26
27Signal::~Signal() {
28    pthread_mutex_destroy(&mMutex);
29    pthread_cond_destroy(&mCondition);
30}
31
32bool 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
49void 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
69void 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