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
25using android::Mutex;
26
27ALooper::ALooper()
28    : mAwoken(false) {
29}
30
31void ALooper::signalSensorEvents(ASensorEventQueue *queue) {
32    Mutex::Autolock autoLock(mLock);
33    mReadyQueues.insert(queue);
34    mCondition.signal();
35}
36
37void ALooper::wake() {
38    Mutex::Autolock autoLock(mLock);
39    mAwoken = true;
40    mCondition.signal();
41}
42
43int 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 =
54            systemTime(SYSTEM_TIME_MONOTONIC) + timeoutMillis * 1000000ll;
55    }
56
57    Mutex::Autolock autoLock(mLock);
58    int64_t nowNs;
59    while ((timeoutMillis < 0
60                || (nowNs = systemTime(SYSTEM_TIME_MONOTONIC)) < waitUntilNs)
61            && mReadyQueues.empty()
62            && !mAwoken) {
63        if (timeoutMillis < 0) {
64            mCondition.wait(mLock);
65        } else {
66            mCondition.waitRelative(mLock, waitUntilNs - nowNs);
67        }
68    }
69
70    int result = ALOOPER_POLL_TIMEOUT;
71
72    if (!mReadyQueues.empty()) {
73        result = ALOOPER_POLL_CALLBACK;
74
75        for (auto queue : mReadyQueues) {
76            queue->dispatchCallback();
77        }
78
79        mReadyQueues.clear();
80    } else if (mAwoken) {
81        result = ALOOPER_POLL_WAKE;
82        mAwoken = false;
83    }
84
85    LOG(VERBOSE) << "pollOnce returning " << result;
86
87    return result;
88}
89
90void ALooper::invalidateSensorQueue(ASensorEventQueue *queue) {
91    Mutex::Autolock autoLock(mLock);
92    mReadyQueues.erase(queue);
93}
94
95