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 23 Signal::Signal() { 24 mSet = true; 25 } 26 27 Signal::~Signal() { 28 pthread_mutex_destroy(&mMutex); 29 pthread_cond_destroy(&mCondition); 30 } 31 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 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 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
