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/*
* Copyright (C) 2017 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 "ALooper.h"
#include "ASensorEventQueue.h"
#define LOG_TAG "libsensorndkbridge"
#include <android/looper.h>
#include <android-base/logging.h>
using android::Mutex;
ALooper::ALooper()
: mAwoken(false) {
}
void ALooper::signalSensorEvents(const std::shared_ptr<ASensorEventQueue>& queue) {
Mutex::Autolock autoLock(mLock);
mReadyQueues.push_back(std::weak_ptr<ASensorEventQueue>(queue));
mCondition.signal();
}
void ALooper::wake() {
Mutex::Autolock autoLock(mLock);
mAwoken = true;
mCondition.signal();
}
int ALooper::pollOnce(
int timeoutMillis, int *outFd, int *outEvents, void **outData) {
if (outFd) { *outFd = 0; }
if (outEvents) { *outEvents = 0; }
if (outData) { *outData = NULL; }
int64_t waitUntilNs;
if (timeoutMillis < 0) {
waitUntilNs = -1;
} else {
waitUntilNs = systemTime(SYSTEM_TIME_MONOTONIC) + timeoutMillis * 1000000LL;
}
Mutex::Autolock autoLock(mLock);
int64_t nowNs;
while ((timeoutMillis < 0
|| (nowNs = systemTime(SYSTEM_TIME_MONOTONIC)) < waitUntilNs)
&& mReadyQueues.empty()
&& !mAwoken) {
if (timeoutMillis < 0) {
mCondition.wait(mLock);
} else {
mCondition.waitRelative(mLock, waitUntilNs - nowNs);
}
}
int result = ALOOPER_POLL_TIMEOUT;
if (!mReadyQueues.empty()) {
result = ALOOPER_POLL_CALLBACK;
for (auto& queue : mReadyQueues) {
std::shared_ptr<ASensorEventQueue> promotedQueue = queue.lock();
if (promotedQueue != nullptr) {
promotedQueue->dispatchCallback();
}
}
mReadyQueues.clear();
} else if (mAwoken) {
result = ALOOPER_POLL_WAKE;
mAwoken = false;
}
LOG(VERBOSE) << "pollOnce returning " << result;
return result;
}
void ALooper::invalidateSensorQueue(const std::shared_ptr<ASensorEventQueue>& queue) {
Mutex::Autolock autoLock(mLock);
mReadyQueues.erase(std::remove_if(mReadyQueues.begin(), mReadyQueues.end(),
[&](const std::weak_ptr<ASensorEventQueue>& ptr) {
std::shared_ptr<ASensorEventQueue> in = ptr.lock();
return (in == nullptr) || (in == queue);
}),
mReadyQueues.end());
}
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