119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __MESSAGE_QUEUE_H__
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#define __MESSAGE_QUEUE_H__
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#include <cstdint>
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#include "message.hpp"
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#include "fifo.hpp"
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#include <ch.h>
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class MessageQueue {
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public:
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MessageQueue() = delete;
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MessageQueue(const MessageQueue&) = delete;
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MessageQueue(MessageQueue&&) = delete;
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MessageQueue(
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uint8_t* const data,
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size_t k
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) : fifo { data, k }
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{
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chMtxInit(&mutex_write);
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}
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template<typename T>
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bool push(const T& message) {
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static_assert(sizeof(T) <= Message::MAX_SIZE, "Message::MAX_SIZE too small for message type");
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static_assert(std::is_base_of<Message, T>::value, "type is not based on Message");
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return push(&message, sizeof(message));
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}
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template<typename T>
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bool push_and_wait(const T& message) {
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const bool result = push(message);
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if( result ) {
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// TODO: More graceful method of waiting for empty? Maybe sleep for a bit?
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while( !is_empty() );
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}
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return result;
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}
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template<typename HandlerFn>
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void handle(HandlerFn handler) {
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std::array<uint8_t, Message::MAX_SIZE> message_buffer;
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while(Message* const message = peek(message_buffer)) {
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handler(message);
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skip();
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}
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}
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bool is_empty() const {
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return fifo.is_empty();
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}
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void reset() {
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fifo.reset();
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}
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private:
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FIFO<uint8_t> fifo;
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Mutex mutex_write { };
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Message* peek(std::array<uint8_t, Message::MAX_SIZE>& buf) {
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Message* const p = reinterpret_cast<Message*>(buf.data());
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return fifo.peek_r(buf.data(), buf.size()) ? p : nullptr;
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}
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bool skip() {
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return fifo.skip();
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}
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Message* pop(std::array<uint8_t, Message::MAX_SIZE>& buf) {
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Message* const p = reinterpret_cast<Message*>(buf.data());
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return fifo.out_r(buf.data(), buf.size()) ? p : nullptr;
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}
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size_t len() const {
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return fifo.len();
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}
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bool push(const void* const buf, const size_t len) {
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chMtxLock(&mutex_write);
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const auto result = fifo.in_r(buf, len);
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chMtxUnlock();
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const bool success = (result == len);
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if( success ) {
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signal();
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}
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return success;
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}
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void signal();
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};
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#endif/*__MESSAGE_QUEUE_H__*/
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