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