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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 #include <errno.h>
     19 
     20 using namespace android;
     21 using namespace android::renderscript;
     22 
     23 
     24 Signal::Signal() {
     25     mSet = true;
     26 }
     27 
     28 Signal::~Signal() {
     29     pthread_mutex_destroy(&mMutex);
     30     pthread_cond_destroy(&mCondition);
     31 }
     32 
     33 bool 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 
     50 void 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 
     72 bool 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