fsfw/osal/FreeRTOS/MessageQueue.h

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#ifndef MESSAGEQUEUE_H_
#define MESSAGEQUEUE_H_
#include <framework/internalError/InternalErrorReporterIF.h>
#include <framework/ipc/MessageQueueIF.h>
#include <framework/ipc/MessageQueueMessage.h>
#include <FreeRTOS.h>
#include "queue.h"
#include "portmacro.h"
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//TODO this class assumes that MessageQueueId_t is the same size as void* (the FreeRTOS handle type), compiler will catch this but it might be nice to have something checking or even an always working solution
// https://scaryreasoner.wordpress.com/2009/02/28/checking-sizeof-at-compile-time/
/**
* @brief This class manages sending and receiving of message queue messages.
*
* @details Message queues are used to pass asynchronous messages between processes.
* They work like post boxes, where all incoming messages are stored in FIFO
* order. This class creates a new receiving queue and provides methods to fetch
* received messages. Being a child of MessageQueueSender, this class also provides
* methods to send a message to a user-defined or a default destination. In addition
* it also provides a reply method to answer to the queue it received its last message
* from.
*
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* The MessageQueue should be used as "post box" for a single owning object. So all
* message queue communication is "n-to-one".
* For creating the queue, as well as sending and receiving messages, the class makes
* use of the operating system calls provided.
*
* Please keep in mind that FreeRTOS offers
* different calls for message queue operations if called from an ISR.
* For now, the system context needs to be switched manually.
* @ingroup osal
* @ingroup message_queue
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*/
class MessageQueue : public MessageQueueIF {
friend class MessageQueueSenderIF;
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public:
/**
* @brief The constructor initializes and configures the message queue.
* @details By making use of the according operating system call, a message queue is created
* and initialized. The message depth - the maximum number of messages to be
* buffered - may be set with the help of a parameter, whereas the message size is
* automatically set to the maximum message queue message size. The operating system
* sets the message queue id, or i case of failure, it is set to zero.
* @param message_depth The number of messages to be buffered before passing an error to the
* sender. Default is three.
* @param max_message_size With this parameter, the maximum message size can be adjusted.
* This should be left default.
*/
MessageQueue( size_t message_depth = 3, size_t max_message_size = MessageQueueMessage::MAX_MESSAGE_SIZE );
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/**
* @brief The destructor deletes the formerly created message queue.
* @details This is accomplished by using the delete call provided by the operating system.
*/
virtual ~MessageQueue();
/*!
* Used by calling function to tell the callbacks if they are being called from
* within an ISR or from a regular task. This is required because FreeRTOS
* has different functions for handling semaphores from within an ISR and task.
*/
typedef enum _SystemContext {
task_context = 0x00,//!< task_context
isr_context = 0xFF //!< isr_context
} SystemContext;
/**
* This function is used to specify whether a message queue operation is called
* from within an ISR or a task. FreeRTOS offers different functions for this task.
* @param callContext
*/
void switchSystemContext(SystemContext callContext);
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/**
* @brief This operation sends a message to the given destination.
* @details It directly uses the sendMessage call of the MessageQueueSender parent, but passes its
* queue id as "sentFrom" parameter.
* @param sendTo This parameter specifies the message queue id of the destination message queue.
* @param message A pointer to a previously created message, which is sent.
* @param ignoreFault If set to true, the internal software fault counter is not incremented if queue is full.
*/
ReturnValue_t sendMessage(MessageQueueId_t sendTo,
MessageQueueMessage* message, bool ignoreFault = false );
/**
* @brief This operation sends a message to the default destination.
* @details As in the sendMessage method, this function uses the sendToDefault call of the
* MessageQueueSender parent class and adds its queue id as "sentFrom" information.
* @param message A pointer to a previously created message, which is sent.
*/
ReturnValue_t sendToDefault( MessageQueueMessage* message );
/**
* @brief This operation sends a message to the last communication partner.
* @details This operation simplifies answering an incoming message by using the stored
* lastParnter information as destination. If there was no message received yet
* (i.e. lastPartner is zero), an error code is returned.
* @param message A pointer to a previously created message, which is sent.
*/
ReturnValue_t reply( MessageQueueMessage* message );
/**
* \brief With the sendMessage call, a queue message is sent to a receiving queue.
* \details This method takes the message provided, adds the sentFrom information and passes
* it on to the destination provided with an operating system call. The OS's return
* value is returned.
* \param sendTo This parameter specifies the message queue id to send the message to.
* \param message This is a pointer to a previously created message, which is sent.
* \param sentFrom The sentFrom information can be set to inject the sender's queue id into the message.
* This variable is set to zero by default.
* \param ignoreFault If set to true, the internal software fault counter is not incremented if queue is full.
*/
virtual ReturnValue_t sendMessageFrom( MessageQueueId_t sendTo, MessageQueueMessage* message,
MessageQueueId_t sentFrom = NO_QUEUE, bool ignoreFault = false );
/**
* \brief The sendToDefault method sends a queue message to the default destination.
* \details In all other aspects, it works identical to the sendMessage method.
* \param message This is a pointer to a previously created message, which is sent.
* \param sentFrom The sentFrom information can be set to inject the sender's queue id into the message.
* This variable is set to zero by default.
*/
virtual ReturnValue_t sendToDefaultFrom( MessageQueueMessage* message, MessageQueueId_t sentFrom = NO_QUEUE, bool ignoreFault = false );
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/**
* @brief This function reads available messages from the message queue and returns the sender.
* @details It works identically to the other receiveMessage call, but in addition returns the
* sender's queue id.
* @param message A pointer to a message in which the received data is stored.
* @param receivedFrom A pointer to a queue id in which the sender's id is stored.
*/
ReturnValue_t receiveMessage(MessageQueueMessage* message,
MessageQueueId_t *receivedFrom);
/**
* @brief This function reads available messages from the message queue.
* @details If data is available it is stored in the passed message pointer. The message's
* original content is overwritten and the sendFrom information is stored in the
* lastPartner attribute. Else, the lastPartner information remains untouched, the
* message's content is cleared and the function returns immediately.
* @param message A pointer to a message in which the received data is stored.
*/
ReturnValue_t receiveMessage(MessageQueueMessage* message);
/**
* Deletes all pending messages in the queue.
* @param count The number of flushed messages.
* @return RETURN_OK on success.
*/
ReturnValue_t flush(uint32_t* count);
/**
* @brief This method returns the message queue id of the last communication partner.
*/
MessageQueueId_t getLastPartner() const;
/**
* @brief This method returns the message queue id of this class's message queue.
*/
MessageQueueId_t getId() const;
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/**
* \brief This method is a simple setter for the default destination.
*/
void setDefaultDestination(MessageQueueId_t defaultDestination);
/**
* \brief This method is a simple getter for the default destination.
*/
MessageQueueId_t getDefaultDestination() const;
bool isDefaultDestinationSet() const;
protected:
/**
* Implementation to be called from any send Call within MessageQueue and MessageQueueSenderIF
* \details This method takes the message provided, adds the sentFrom information and passes
* it on to the destination provided with an operating system call. The OS's return
* value is returned.
* \param sendTo This parameter specifies the message queue id to send the message to.
* \param message This is a pointer to a previously created message, which is sent.
* \param sentFrom The sentFrom information can be set to inject the sender's queue id into the message.
* This variable is set to zero by default.
* \param ignoreFault If set to true, the internal software fault counter is not incremented if queue is full.
* \param context
*/
static ReturnValue_t sendMessageFromMessageQueue(MessageQueueId_t sendTo,
MessageQueueMessage* message, MessageQueueId_t sentFrom = NO_QUEUE,
bool ignoreFault=false, SystemContext callContex = SystemContext::task_context);
static ReturnValue_t handleSendResult(BaseType_t result, bool ignoreFault);
/**
* In this function, a function dependant on the portmacro.h header function calls
* to request a context switch can be specified.
* This can be used if sending to the queue from an ISR caused a task to unblock
* and a context switch is required.
*/
static void requestContextSwitch(SystemContext callContext);
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private:
QueueHandle_t handle;
MessageQueueId_t defaultDestination;
MessageQueueId_t lastPartner;
SystemContext callContext; //!< Stores the current system context
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};
#endif /* MESSAGEQUEUE_H_ */