/*
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* Copyright (C) 2014 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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#include "looper.h"
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#include <assert.h>
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#include <jni.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include <semaphore.h>
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// for __android_log_print(ANDROID_LOG_INFO, "YourApp", "formatted message");
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#include <android/log.h>
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#define TAG "NativeCodec-looper"
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#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, TAG, __VA_ARGS__)
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struct loopermessage;
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typedef struct loopermessage loopermessage;
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struct loopermessage {
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int what;
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void *obj;
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loopermessage *next;
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bool quit;
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};
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void* looper::trampoline(void* p) {
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((looper*)p)->loop();
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return NULL;
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}
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looper::looper() {
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sem_init(&headdataavailable, 0, 0);
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sem_init(&headwriteprotect, 0, 1);
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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pthread_create(&worker, &attr, trampoline, this);
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running = true;
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}
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looper::~looper() {
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if (running) {
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LOGV("Looper deleted while still running. Some messages will not be processed");
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quit();
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}
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}
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void looper::post(int what, void *data, bool flush) {
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loopermessage *msg = new loopermessage();
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msg->what = what;
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msg->obj = data;
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msg->next = NULL;
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msg->quit = false;
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addmsg(msg, flush);
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}
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void looper::addmsg(loopermessage *msg, bool flush) {
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sem_wait(&headwriteprotect);
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loopermessage *h = head;
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if (flush) {
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while(h) {
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loopermessage *next = h->next;
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delete h;
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h = next;
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}
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h = NULL;
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}
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if (h) {
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while (h->next) {
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h = h->next;
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}
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h->next = msg;
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} else {
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head = msg;
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}
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//LOGV("post msg %d", msg->what);
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sem_post(&headwriteprotect);
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sem_post(&headdataavailable);
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}
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void looper::loop() {
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while(true) {
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// wait for available message
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sem_wait(&headdataavailable);
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// get next available message
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sem_wait(&headwriteprotect);
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loopermessage *msg = head;
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if (msg == NULL) {
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LOGV("no msg");
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sem_post(&headwriteprotect);
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continue;
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}
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head = msg->next;
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sem_post(&headwriteprotect);
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if (msg->quit) {
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LOGV("quitting");
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delete msg;
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return;
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}
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//LOGV("processing msg %d", msg->what);
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handle(msg->what, msg->obj);
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delete msg;
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}
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}
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void looper::quit() {
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LOGV("quit");
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loopermessage *msg = new loopermessage();
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msg->what = 0;
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msg->obj = NULL;
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msg->next = NULL;
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msg->quit = true;
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addmsg(msg, false);
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void *retval;
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pthread_join(worker, &retval);
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sem_destroy(&headdataavailable);
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sem_destroy(&headwriteprotect);
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running = false;
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}
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void looper::handle(int what, void* obj) {
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LOGV("dropping msg %d %p", what, obj);
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}
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