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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "rsSignal.h"
using namespace android;
using namespace android::renderscript;
Signal::Signal() {
mSet = true;
}
Signal::~Signal() {
pthread_mutex_destroy(&mMutex);
pthread_cond_destroy(&mCondition);
}
bool Signal::init() {
int status = pthread_mutex_init(&mMutex, NULL);
if (status) {
LOGE("LocklessFifo mutex init failure");
return false;
}
status = pthread_cond_init(&mCondition, NULL);
if (status) {
LOGE("LocklessFifo condition init failure");
pthread_mutex_destroy(&mMutex);
return false;
}
return true;
}
void Signal::set() {
int status;
status = pthread_mutex_lock(&mMutex);
if (status) {
LOGE("LocklessCommandFifo: error %i locking for set condition.", status);
return;
}
mSet = true;
status = pthread_cond_signal(&mCondition);
if (status) {
LOGE("LocklessCommandFifo: error %i on set condition.", status);
}
status = pthread_mutex_unlock(&mMutex);
if (status) {
LOGE("LocklessCommandFifo: error %i unlocking for set condition.", status);
}
}
bool Signal::wait(uint64_t timeout) {
int status;
bool ret = false;
status = pthread_mutex_lock(&mMutex);
if (status) {
LOGE("LocklessCommandFifo: error %i locking for condition.", status);
return false;
}
if (!mSet) {
if (!timeout) {
status = pthread_cond_wait(&mCondition, &mMutex);
} else {
#if defined(HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE)
status = pthread_cond_timeout_np(&mCondition, &mMutex, timeout / 1000000);
#else
// This is safe it will just make things less reponsive
status = pthread_cond_wait(&mCondition, &mMutex);
#endif
}
}
if (!status) {
mSet = false;
ret = true;
} else {
if (status != ETIMEDOUT) {
LOGE("LocklessCommandFifo: error %i waiting for condition.", status);
}
}
status = pthread_mutex_unlock(&mMutex);
if (status) {
LOGE("LocklessCommandFifo: error %i unlocking for condition.", status);
}
return ret;
}
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