85448bbecd
This factors out the boiler-plate code from the sample app to a common glue code that can be used for everyone writing this style of app: a dedicated app thread that takes care of waiting for events and processing them. As part of doing this, ALooper has a new facility to allow registration of fds that cause ALooper_pollOnce() to return the fd that has data, allowing the app to drive the loop without callbacks. Hopefully this makes some people feel better. :) Also do some other cleanup of the ALooper API, plus some actual documentation. Change-Id: Ic53bd56bdf627e3ba28a3c093faa06a92be522b8
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "ALooper"
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#include <utils/Log.h>
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#include <android/looper.h>
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#include <utils/PollLoop.h>
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using android::PollLoop;
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using android::sp;
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ALooper* ALooper_forThread() {
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return PollLoop::getForThread().get();
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}
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ALooper* ALooper_prepare(int32_t opts) {
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bool allowFds = (opts&ALOOPER_PREPARE_ALLOW_NON_CALLBACKS) != 0;
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sp<PollLoop> loop = PollLoop::getForThread();
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if (loop == NULL) {
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loop = new PollLoop(allowFds);
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PollLoop::setForThread(loop);
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}
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if (loop->getAllowNonCallbacks() != allowFds) {
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LOGW("ALooper_prepare again with different ALOOPER_PREPARE_ALLOW_NON_CALLBACKS");
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}
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return loop.get();
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}
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int32_t ALooper_pollOnce(int timeoutMillis, int* outEvents, void** outData) {
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sp<PollLoop> loop = PollLoop::getForThread();
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if (loop == NULL) {
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LOGW("ALooper_pollOnce: No looper for this thread!");
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return -1;
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}
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return loop->pollOnce(timeoutMillis, outEvents, outData);
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}
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int32_t ALooper_pollAll(int timeoutMillis, int* outEvents, void** outData) {
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sp<PollLoop> loop = PollLoop::getForThread();
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if (loop == NULL) {
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LOGW("ALooper_pollOnce: No looper for this thread!");
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return -1;
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}
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int32_t result;
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while ((result = loop->pollOnce(timeoutMillis, outEvents, outData)) == ALOOPER_POLL_CALLBACK) {
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;
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}
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return result;
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}
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void ALooper_acquire(ALooper* looper) {
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static_cast<PollLoop*>(looper)->incStrong((void*)ALooper_acquire);
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}
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void ALooper_release(ALooper* looper) {
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static_cast<PollLoop*>(looper)->decStrong((void*)ALooper_acquire);
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}
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void ALooper_addFd(ALooper* looper, int fd, int events,
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ALooper_callbackFunc* callback, void* data) {
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static_cast<PollLoop*>(looper)->setLooperCallback(fd, events, callback, data);
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}
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int32_t ALooper_removeFd(ALooper* looper, int fd) {
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return static_cast<PollLoop*>(looper)->removeCallback(fd) ? 1 : 0;
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}
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