rt-thread/components/cplusplus/Queue.h

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/*
2018-10-14 19:28:18 +08:00
* Copyright (c) 2006-2018, RT-Thread Development Team
*
2018-10-14 19:28:18 +08:00
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2016/10/1 Bernard The first version
*/
#pragma once
#include <stdint.h>
#include <string.h>
#include <rtthread.h>
namespace rtthread {
/**
* The Queue class allow to control, send, receive, or wait for messages.
* A message can be a integer or pointer value to a certain type T that is send
* to a thread or interrupt service routine.
* @param T data type of a single message element.
* @param queue_sz maximum number of messages in queue.
*/
template<typename T, uint32_t queue_sz>
class Queue
{
public:
/** Create and initialise a message Queue. */
Queue()
{
rt_mq_init(&mID, "mq", mPool, sizeof(T), sizeof(mPool), RT_IPC_FLAG_FIFO);
};
~Queue()
{
rt_mq_detach(&mID);
};
/** Put a message in a Queue.
@param data message pointer.
@param millisec timeout value or 0 in case of no time-out. (default: 0)
@return status code that indicates the execution status of the function.
*/
rt_err_t put(T& data, int32_t millisec = 0)
{
return rt_mq_send(&mID, &data, sizeof(data));
}
/** Get a message or Wait for a message from a Queue.
@param millisec timeout value or 0 in case of no time-out. (default: osWaitForever).
@return bool .
*/
bool get(T& data, int32_t millisec = WAIT_FOREVER)
{
rt_int32_t tick;
if (millisec < 0)
tick = -1;
else
tick = rt_tick_from_millisecond(millisec);
return rt_mq_recv(&mID, &data, sizeof(data), tick) == RT_EOK;
}
private:
struct rt_messagequeue mID;
char mPool[(sizeof(struct rt_messagequeue)+sizeof(T)) * queue_sz];
};
}