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
20using namespace android;
21using namespace android::renderscript;
22
23
24Signal::Signal() {
25    mSet = true;
26}
27
28Signal::~Signal() {
29    pthread_mutex_destroy(&mMutex);
30    pthread_cond_destroy(&mCondition);
31}
32
33bool Signal::init() {
34    int status = pthread_mutex_init(&mMutex, nullptr);
35    if (status) {
36        ALOGE("LocklessFifo mutex init failure");
37        return false;
38    }
39
40    status = pthread_cond_init(&mCondition, nullptr);
41    if (status) {
42        ALOGE("LocklessFifo condition init failure");
43        pthread_mutex_destroy(&mMutex);
44        return false;
45    }
46
47    return true;
48}
49
50void Signal::set() {
51    int status;
52
53    status = pthread_mutex_lock(&mMutex);
54    if (status) {
55        ALOGE("LocklessCommandFifo: error %i locking for set condition.", status);
56        return;
57    }
58
59    mSet = true;
60
61    status = pthread_cond_signal(&mCondition);
62    if (status) {
63        ALOGE("LocklessCommandFifo: error %i on set condition.", status);
64    }
65
66    status = pthread_mutex_unlock(&mMutex);
67    if (status) {
68        ALOGE("LocklessCommandFifo: error %i unlocking for set condition.", status);
69    }
70}
71
72bool Signal::wait(uint64_t timeout) {
73    int status;
74    bool ret = false;
75
76    status = pthread_mutex_lock(&mMutex);
77    if (status) {
78        ALOGE("LocklessCommandFifo: error %i locking for condition.", status);
79        return false;
80    }
81
82    if (!mSet) {
83        if (!timeout) {
84            status = pthread_cond_wait(&mCondition, &mMutex);
85        } else {
86#if defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE)
87            status = pthread_cond_timeout_np(&mCondition, &mMutex, timeout / 1000000);
88#else
89            // This is safe it will just make things less reponsive
90            status = pthread_cond_wait(&mCondition, &mMutex);
91#endif
92        }
93    }
94
95    if (!status) {
96        mSet = false;
97        ret = true;
98    } else {
99#ifndef RS_SERVER
100        if (status != ETIMEDOUT) {
101            ALOGE("LocklessCommandFifo: error %i waiting for condition.", status);
102        }
103#endif
104    }
105
106    status = pthread_mutex_unlock(&mMutex);
107    if (status) {
108        ALOGE("LocklessCommandFifo: error %i unlocking for condition.", status);
109    }
110
111    return ret;
112}
113
114