mirror of https://github.com/ARMmbed/mbed-os.git
152 lines
3.6 KiB
C++
152 lines
3.6 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2017-2017 ARM Limited
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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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#ifndef BLE_PAL_SIMPLE_EVENT_QUEUE_H_
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#define BLE_PAL_SIMPLE_EVENT_QUEUE_H_
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#include <new>
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#include "ble/pal/EventQueue.h"
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#include "ble/BLEInstanceBase.h"
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#include "ble/BLE.h"
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namespace ble {
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namespace vendor {
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namespace cordio {
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/**
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* Simple implementation of the pal::EventQueue.
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*/
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struct SimpleEventQueue : pal::EventQueue {
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typedef mbed::Callback<void()> event_t;
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/**
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* Construct an empty event queue.
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*
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* @attention a call to initialize is mandatory before any other call.
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*
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* @param ble_instance_id The id of the ble instance associated with that
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* event queue.
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*/
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SimpleEventQueue() :
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_ble_base(NULL), _ble_instance_id(0), _events(NULL) { }
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/**
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* Initialize the event queue with a BLEInstanceBase and a ble id.
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*
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* @param ble_base the instance which will be used to signal the presence
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* of new events.
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*
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* @param ble_id Id of the BLE instance using that event queue.
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*/
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void initialize(BLEInstanceBase* ble_base, ::BLE::InstanceID_t ble_id)
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{
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_ble_base = ble_base;
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_ble_instance_id = ble_id;
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}
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/**
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* @see ble::pal::EventQueue
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*/
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~SimpleEventQueue()
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{
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clear();
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}
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/**
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* @see ble::pal::post
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*/
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virtual bool post(const mbed::Callback<void()>& event)
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{
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if (_ble_base == NULL) {
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return false;
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}
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void* event_buf = WsfBufAlloc(sizeof(EventNode));
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MBED_ASSERT(event_buf != NULL);
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if (event_buf == NULL) {
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return false;
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}
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EventNode* next = new(event_buf) EventNode(event);
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if (next == NULL) {
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return false;
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}
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if (_events == NULL) {
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_events = next;
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} else {
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EventNode* previous = _events;
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while (previous->next) {
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previous = previous->next;
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}
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previous->next = next;
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}
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signal_event();
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return true;
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}
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/**
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* Clear the event queue from all its events.
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*/
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void clear()
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{
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while (_events) {
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EventNode* next = _events->next;
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_events->~EventNode();
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WsfBufFree(_events);
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_events = next;
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}
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}
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/**
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* Process the event queue.
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*/
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void process()
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{
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while (_events) {
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EventNode* next = _events->next;
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_events->event();
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_events->~EventNode();
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WsfBufFree(_events);
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_events = next;
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}
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}
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private:
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struct EventNode {
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EventNode(const event_t event) : event(event), next(NULL) { }
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event_t event;
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EventNode* next;
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};
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void signal_event()
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{
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_ble_base->signalEventsToProcess(_ble_instance_id);
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}
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BLEInstanceBase* _ble_base;
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::BLE::InstanceID_t _ble_instance_id;
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EventNode* _events;
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};
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} // namespace cordio
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} // namespace vendor
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} // namespace ble
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#endif /* BLE_PAL_SIMPLE_EVENT_QUEUE_H_ */
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