EventQueue.cpp

00001 /* events
00002  * Copyright (c) 2016 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "events/EventQueue.h"
00017 
00018 #include "events/mbed_events.h"
00019 #include "mbed.h"
00020 
00021 
00022 EventQueue::EventQueue(unsigned event_size, unsigned char *event_pointer) {
00023     if (!event_pointer) {
00024         equeue_create(&_equeue, event_size);
00025     } else {
00026         equeue_create_inplace(&_equeue, event_size, event_pointer);
00027     }
00028 }
00029 
00030 EventQueue::~EventQueue() {
00031     equeue_destroy(&_equeue);
00032 }
00033 
00034 void EventQueue::dispatch(int ms) {
00035     return equeue_dispatch(&_equeue, ms);
00036 }
00037 
00038 void EventQueue::break_dispatch() {
00039     return equeue_break(&_equeue);
00040 }
00041 
00042 unsigned EventQueue::tick() {
00043     return equeue_tick();
00044 }
00045 
00046 void EventQueue::cancel(int id) {
00047     return equeue_cancel(&_equeue, id);
00048 }
00049 
00050 void EventQueue::background(Callback<void(int)> update) {
00051     _update = update;
00052 
00053     if (_update) {
00054         equeue_background(&_equeue, &Callback<void(int)>::thunk, &_update);
00055     } else {
00056         equeue_background(&_equeue, 0, 0);
00057     }
00058 }
00059 
00060 void EventQueue::chain(EventQueue *target) {
00061     if (target) {
00062         equeue_chain(&_equeue, &target->_equeue);
00063     } else {
00064         equeue_chain(&_equeue, 0);
00065     }
00066 }