looper.cpp revision 42c03e579aade011b451e2a13ea3f44a2ef0056a 
1/*
2 * Copyright (C) 2010 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#define LOG_TAG "ALooper"
18#include <utils/Log.h>
19
20#include <android/looper.h>
21#include <utils/PollLoop.h>
22
23using android::PollLoop;
24using android::sp;
25
26ALooper* ALooper_forThread() {
27    return PollLoop::getForThread().get();
28}
29
30ALooper* ALooper_prepare(int32_t opts) {
31    bool allowFds = (opts&ALOOPER_PREPARE_ALLOW_NON_CALLBACKS) != 0;
32    sp<PollLoop> loop = PollLoop::getForThread();
33    if (loop == NULL) {
34        loop = new PollLoop(allowFds);
35        PollLoop::setForThread(loop);
36    }
37    if (loop->getAllowNonCallbacks() != allowFds) {
38        LOGW("ALooper_prepare again with different ALOOPER_PREPARE_ALLOW_NON_CALLBACKS");
39    }
40    return loop.get();
41}
42
43int32_t ALooper_pollOnce(int timeoutMillis, int* outEvents, void** outData) {
44    sp<PollLoop> loop = PollLoop::getForThread();
45    if (loop == NULL) {
46        LOGW("ALooper_pollOnce: No looper for this thread!");
47        return -1;
48    }
49    return loop->pollOnce(timeoutMillis, outEvents, outData);
50}
51
52int32_t ALooper_pollAll(int timeoutMillis, int* outEvents, void** outData) {
53    sp<PollLoop> loop = PollLoop::getForThread();
54    if (loop == NULL) {
55        LOGW("ALooper_pollOnce: No looper for this thread!");
56        return -1;
57    }
58
59    int32_t result;
60    while ((result = loop->pollOnce(timeoutMillis, outEvents, outData)) == ALOOPER_POLL_CALLBACK) {
61        ;
62    }
63
64    return result;
65}
66
67void ALooper_acquire(ALooper* looper) {
68    static_cast<PollLoop*>(looper)->incStrong((void*)ALooper_acquire);
69}
70
71void ALooper_release(ALooper* looper) {
72    static_cast<PollLoop*>(looper)->decStrong((void*)ALooper_acquire);
73}
74
75void ALooper_addFd(ALooper* looper, int fd, int ident, int events,
76        ALooper_callbackFunc* callback, void* data) {
77    static_cast<PollLoop*>(looper)->setLooperCallback(fd, ident, events, callback, data);
78}
79
80int32_t ALooper_removeFd(ALooper* looper, int fd) {
81    return static_cast<PollLoop*>(looper)->removeCallback(fd) ? 1 : 0;
82}
83