1 /*
2 * Copyright (C) 2017 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 "ALooper.h"
18
19 #include "ASensorEventQueue.h"
20
21 #define LOG_TAG "libsensorndkbridge"
22 #include <android/looper.h>
23 #include <android-base/logging.h>
24
25 using android::Mutex;
26
ALooper()27 ALooper::ALooper()
28 : mAwoken(false) {
29 }
30
signalSensorEvents(const std::shared_ptr<ASensorEventQueue> & queue)31 void ALooper::signalSensorEvents(const std::shared_ptr<ASensorEventQueue>& queue) {
32 Mutex::Autolock autoLock(mLock);
33 mReadyQueues.push_back(std::weak_ptr<ASensorEventQueue>(queue));
34 mCondition.signal();
35 }
36
wake()37 void ALooper::wake() {
38 Mutex::Autolock autoLock(mLock);
39 mAwoken = true;
40 mCondition.signal();
41 }
42
pollOnce(int timeoutMillis,int * outFd,int * outEvents,void ** outData)43 int ALooper::pollOnce(
44 int timeoutMillis, int *outFd, int *outEvents, void **outData) {
45 if (outFd) { *outFd = 0; }
46 if (outEvents) { *outEvents = 0; }
47 if (outData) { *outData = NULL; }
48
49 int64_t waitUntilNs;
50 if (timeoutMillis < 0) {
51 waitUntilNs = -1;
52 } else {
53 waitUntilNs = systemTime(SYSTEM_TIME_MONOTONIC) + timeoutMillis * 1000000LL;
54 }
55
56 Mutex::Autolock autoLock(mLock);
57 int64_t nowNs;
58 while ((timeoutMillis < 0
59 || (nowNs = systemTime(SYSTEM_TIME_MONOTONIC)) < waitUntilNs)
60 && mReadyQueues.empty()
61 && !mAwoken) {
62 if (timeoutMillis < 0) {
63 mCondition.wait(mLock);
64 } else {
65 mCondition.waitRelative(mLock, waitUntilNs - nowNs);
66 }
67 }
68
69 int result = ALOOPER_POLL_TIMEOUT;
70
71 if (!mReadyQueues.empty()) {
72 result = ALOOPER_POLL_CALLBACK;
73
74 for (auto& queue : mReadyQueues) {
75 std::shared_ptr<ASensorEventQueue> promotedQueue = queue.lock();
76 if (promotedQueue != nullptr) {
77 promotedQueue->dispatchCallback();
78 }
79 }
80
81 mReadyQueues.clear();
82 } else if (mAwoken) {
83 result = ALOOPER_POLL_WAKE;
84 mAwoken = false;
85 }
86
87 LOG(VERBOSE) << "pollOnce returning " << result;
88
89 return result;
90 }
91
invalidateSensorQueue(const std::shared_ptr<ASensorEventQueue> & queue)92 void ALooper::invalidateSensorQueue(const std::shared_ptr<ASensorEventQueue>& queue) {
93 Mutex::Autolock autoLock(mLock);
94
95 mReadyQueues.erase(std::remove_if(mReadyQueues.begin(), mReadyQueues.end(),
96 [&](const std::weak_ptr<ASensorEventQueue>& ptr) {
97 std::shared_ptr<ASensorEventQueue> in = ptr.lock();
98 return (in == nullptr) || (in == queue);
99 }),
100 mReadyQueues.end());
101 }
102