QF Active Object Framework. More...

Classes
class	Attr
	Private attributes of the QF framework. More...

Functions
void	init ()

void	stop ()

int_t	run ()

void	onStartup ()

void	onCleanup ()

void	psInit (QSubscrList *const subscrSto, enum_t const maxSignal) noexcept

void	publish_ (QEvt const const e, void const const sender, std::uint_fast8_t const qsId) noexcept

void	tick (std::uint_fast8_t const tickRate, void const *const sender) noexcept

std::uint_fast16_t	getQueueMin (std::uint_fast8_t const prio) noexcept

void	poolInit (void *const poolSto, std::uint_fast32_t const poolSize, std::uint_fast16_t const evtSize) noexcept

std::uint_fast16_t	poolGetMaxBlockSize () noexcept

std::uint_fast16_t	getPoolMin (std::uint_fast8_t const poolNum) noexcept

QEvt *	newX_ (std::uint_fast16_t const evtSize, std::uint_fast16_t const margin, enum_t const sig) noexcept

void	gc (QEvt const *const e) noexcept
	Recycle a mutable (mutable) event.

QEvt const *	newRef_ (QEvt const const e, QEvt const const evtRef) noexcept

void	deleteRef_ (QEvt const *const evtRef) noexcept

template<class evtT_, typename... Args>
evtT_ *	q_new (enum_t const sig, Args... args)

template<class evtT_, typename... Args>
evtT_ *	q_new_x (std::uint_fast16_t const margin, enum_t const sig, Args... args)

template<class evtT_>
void	q_new_ref (QP::QEvt const const e, evtT_ const &evtRef)

template<class evtT_>
void	q_delete_ref (evtT_ const *&evtRef)

QEvt *	newXfromISR_ (std::uint_fast16_t const evtSize, std::uint_fast16_t const margin, enum_t const sig) noexcept

void	gcFromISR (QEvt const *e) noexcept

void	bzero_ (void *const start, std::uint_fast16_t const len) noexcept

Variables
constexpr std::uint_fast16_t	NO_MARGIN {0xFFFFU}

QF::Attr	priv_

Detailed Description

QF Active Object Framework.

Function Documentation

◆ init()

void QP::QF::init ( void )

QF initialization

Details: Initializes QF and must be called exactly once before any other QF function. Typically, QF_init() is called from main() even before initializing the Board Support Package (BSP).

Note: QF::init() clears the internal QF variables, so that the framework can start correctly even if the startup code fails to clear the uninitialized data (as is required by the C Standard).

Backward Traceability

DVR_QP_MC4_R11_08

Definition at line 97 of file qv.cpp.

◆ stop()

void QP::QF::stop ( )

Invoked by the application layer to stop the QF framework and return control to the OS/Kernel (used in some QF ports).

Details: This function stops the QF application. After calling this function, QF attempts to gracefully stop the application. This graceful shutdown might take some time to complete. The typical use of this function is for terminating the QF application to return back to the operating system or for handling fatal errors that require shutting down (and possibly re-setting) the system.

Attention: After calling QF_stop() the application must terminate and cannot continue. In particular, QF_stop() is not intended to be followed by a call to QF_init() to "resurrect" the application.

Definition at line 108 of file qv.cpp.

◆ run()

int_t QP::QF::run ( )

Transfers control to QF to run the application.

Details: QF::run() is typically called from your startup code after you initialize the QF and start at least one active object with QActive::start().

Returns: Typically in embedded systems QF::run() does not return, but in case QF runs on top of a General-Purpose OS (GPOS), QF::run() returns the error status with value 0 representing success.

Definition at line 114 of file qv.cpp.

◆ onStartup()

void QP::QF::onStartup ( )

Startup QF callback.

Details: The purpose of the QF_onStartup() callback is to configure and enable hardware interrupts. The callback is invoked from QF_run(), right before starting the underlying real-time kernel. By that time, the application is considered ready to receive and service interrupts.

This function is application-specific and is not implemented in QF, but rather in the Board Support Package (BSP) for the given application.

◆ onCleanup()

void QP::QF::onCleanup ( )

Cleanup QF callback.

Details: QP::QF::onCleanup() is called in some QF ports before QF returns to the underlying real-time kernel or operating system.

This function is strongly platform-specific and is not implemented in the QF, but either in the QF port or in the Board Support Package (BSP) for the given application. Some QF ports might not require implementing QF_onCleanup() at all, because many embedded applications don't have anything to exit to.

◆ psInit()

void QP::QF::psInit	(	QSubscrList *const	subscrSto,
		enum_t const	maxSignal )

inlinenoexcept

Deprecated

Definition at line 872 of file qp.hpp.

◆ publish_()

void QP::QF::publish_	(	QEvt const *const	e,
		void const *const	sender,
		std::uint_fast8_t const	qsId )

inlinenoexcept

Deprecated

Definition at line 880 of file qp.hpp.

◆ tick()

void QP::QF::tick	(	std::uint_fast8_t const	tickRate,
		void const *const	sender )

inlinenoexcept

Deprecated

Definition at line 889 of file qp.hpp.

◆ getQueueMin()

std::uint_fast16_t QP::QF::getQueueMin ( std::uint_fast8_t const prio )

inlinenoexcept

Deprecated

This function returns the minimum of free entries of the given event queue.

Details: Queries the minimum of free ever present in the given event queue of an active object with priority prio, since the active object was started.

Note: This function is available only when the native QF event queue implementation is used. Requesting the queue minimum of an unused priority level raises an assertion in the QF. (A priority level becomes used in QF after the call to the QActive_register_() function.)

Parameters

[in] prio Priority of the active object, whose queue is queried

Returns: The minimum of free ever present in the given event queue of an active object with priority prio, since the active object was started.

Definition at line 897 of file qp.hpp.

◆ poolInit()

void QP::QF::poolInit	(	void *const	poolSto,
		std::uint_fast32_t const	poolSize,
		std::uint_fast16_t const	evtSize )

noexcept

Event pool initialization for dynamic allocation of events.

Details: This function initializes one event pool at a time and must be called exactly once for each event pool before the pool can be used.

Parameters

[in]	poolSto	pointer to the storage for the event pool
[in]	poolSize	size of the storage for the pool in bytes
[in]	evtSize	the block-size of the pool in bytes, which determines the maximum size of events that can be allocated from the pool.

Precondition qf_dyn:200

the number of event-pools initialized so far must not exceed the maximum QF_MAX_EPOOL

Precondition qf_dyn:201

except the first event-pool 0, the event-size of the previously initialized event pool must not exceed the next event size.

You might initialize many event pools by making many consecutive calls to the QF_poolInit() function. However, for the simplicity of the internal implementation, you must initialize event pools in the ascending order of the event size.

Remarks: Many RTOSes provide fixed block-size heaps, a.k.a. memory pools that can be adapted for QF event-pools. In case the pools from the RTOS are not used, QF provides a native memory pool implementation (QMPool). The macro QF_EPOOL_TYPE_ determines the type of event pool used by a particular QF port.

Note: The actual number of events available in the pool might be actually less than (poolSize / evtSize) due to the internal alignment of the blocks that the pool might perform. You can always check the capacity of the pool by calling QF_getPoolMin().; The dynamic allocation of events is optional, meaning that you might choose not to use mutable events. In that case calling QF_poolInit() and using up memory for the memory blocks is unnecessary.

Definition at line 51 of file qf_dyn.cpp.

◆ poolGetMaxBlockSize()

std::uint_fast16_t QP::QF::poolGetMaxBlockSize ( )

noexcept

Obtain the block size of any registered event pools.

Details: Obtain the block size of any registered event pools

Definition at line 88 of file qf_dyn.cpp.

◆ getPoolMin()

std::uint_fast16_t QP::QF::getPoolMin ( std::uint_fast8_t const poolNum )

noexcept

Obtain the minimum of free entries of the given event pool.

Details: This function obtains the minimum number of free blocks in the given event pool since this pool has been initialized by a call to QF_poolInit().

Parameters

[in] poolNum event pool ID in the range 1..max_pool, where max_pool is the number of event pools initialized with the function QF_poolInit().

Returns: the minimum number of unused blocks in the given event pool.

Precondition qf_dyn:400

the poolNum must be in range

Definition at line 99 of file qf_dyn.cpp.

◆ newX_()

QEvt * QP::QF::newX_	(	std::uint_fast16_t const	evtSize,
		std::uint_fast16_t const	margin,
		enum_t const	sig )

noexcept

Internal QF implementation of creating new mutable event.

Details: Allocates an event dynamically from one of the QF event pools.

Parameters

[in]	evtSize	the size (in bytes) of the event to allocate
[in]	margin	the number of un-allocated events still available in a given event pool after the allocation completes. The special value QF::NO_MARGIN means that this function will assert if allocation fails.
[in]	sig	the signal to be assigned to the allocated event

Returns: Pointer to the newly allocated event. This pointer can be NULL only if margin != QF::NO_MARGIN and the event cannot be allocated with the specified margin still available in the given pool.

Precondition qf_dyn:300

the event size must fit one of the initialized event pools

Note: The internal QF function QF_newX_() raises an assertion when the margin parameter is QF::NO_MARGIN and allocation of the event turns out to be impossible due to event pool depletion, or incorrect (too big) size of the requested event.; The application code should not call this function directly. The only allowed use is thorough the QP::QF::q_new() or QP::QF::q_new_x() function templates.

Definition at line 115 of file qf_dyn.cpp.

◆ gc()

void QP::QF::gc ( QEvt const *const e )

noexcept

Recycle a mutable (mutable) event.

Details: This function implements a simple garbage collector for the mutable events. Only mutable events are candidates for recycling. (A mutable event is one that is allocated from an event-pool, which is determined as non-zero QEvt_getPoolId_(e)) Next, the function decrements the reference counter of the event (e->refCtr_), and recycles the event only if the counter drops to zero (meaning that no more references are outstanding for this event). The mutable event is recycled by returning it to the pool from which it was originally allocated.

Parameters

[in] e pointer to the event to recycle

Note: QF invokes the garbage collector at all appropriate contexts, when an event can become garbage (automatic garbage collection), so the application code should have no need to call QF_gc() directly. The QF_gc() function is exposed only for special cases when your application sends mutable events to the "raw" thread-safe queues (see QEQueue). Such queues are processed outside of QF and the automatic garbage collection is NOT performed for these events. In this case you need to call QF_gc() explicitly.

Backward Traceability

DVR_QP_MC4_R11_08: Rule 11.8(Required): A cast shall not remove any 'const' or 'volatile' qualification from the type pointer to by a pointer

Definition at line 188 of file qf_dyn.cpp.

◆ newRef_()

QEvt const * QP::QF::newRef_	(	QEvt const *const	e,
		QEvt const *const	evtRef )

noexcept

Definition at line 243 of file qf_dyn.cpp.

◆ deleteRef_()

void QP::QF::deleteRef_ ( QEvt const *const evtRef )

noexcept

Definition at line 278 of file qf_dyn.cpp.

◆ q_new()

template<class evtT_, typename... Args>

evtT_ * QP::QF::q_new	(	enum_t const	sig,
		Args...	args )

inline

Definition at line 938 of file qp.hpp.

◆ q_new_x()

template<class evtT_, typename... Args>

evtT_ * QP::QF::q_new_x	(	std::uint_fast16_t const	margin,
		enum_t const	sig,
		Args...	args )

inline

Definition at line 948 of file qp.hpp.

◆ q_new_ref()

template<class evtT_>

void QP::QF::q_new_ref	(	QP::QEvt const *const	e,
		evtT_ const *&	evtRef )

inline

Create a new reference of the current event e

Details: The current event processed by an Active Object is available only for the duration of the run-to-completion (RTC) step. After that step, the current event is no longer available and the framework might recycle (garbage-collect) the event. The function template QP::QF::q_new_ref() explicitly creates a new reference to the current event that can be stored and used beyond the current RTC step, until the reference is explicitly recycled by means of the function template QP::QF::q_delete_ref().

See also: Q_NEW_REF()

Template Parameters

evtT_ event class (class name) of the event to allocate

Parameters

[in]	e	event to create a reference to
[in,out]	evtRef	reference object (of the type `evtT_*`

Returns: This function template does not return a value, but it modifies the evtRef parameter.

Usage: The example examples/posix-win32/defer illustrates the use of QP::QF::q_new_ref()

Definition at line 962 of file qp.hpp.

◆ q_delete_ref()

template<class evtT_>

void QP::QF::q_delete_ref ( evtT_ const *& evtRef )

inline

Delete a new reference of the current event e

Details: Every event reference created with the function template QP::QF::q_new_ref() needs to be eventually deleted by means of the function template QP::QF::q_delete_ref() to avoid leaking the event.

See also: Q_DELETE_REF()

Template Parameters

evtT_ event class (class name) of the event to allocate

Parameters

[in,out] evtRef_ event reference to delete

Returns: This function template does not return a value, but it modifies the evtRef parameter.

Usage: The example examples/posix-win32/defer illustrates the use of QP::QF::q_delete_ref()

Definition at line 970 of file qp.hpp.

◆ newXfromISR_()

QEvt * QP::QF::newXfromISR_	(	std::uint_fast16_t const	evtSize,
		std::uint_fast16_t const	margin,
		enum_t const	sig )

noexcept

◆ gcFromISR()

void QP::QF::gcFromISR ( QEvt const * e )

noexcept

◆ bzero_()

void QP::QF::bzero_	(	void *const	start,
		std::uint_fast16_t const	len )

noexcept

Definition at line 56 of file qf_act.cpp.

Variable Documentation

◆ NO_MARGIN

std::uint_fast16_t QP::QF::NO_MARGIN {0xFFFFU}

constexpr

Definition at line 901 of file qp.hpp.

◆ priv_

QF::Attr QP::QF::priv_

Definition at line 54 of file qf_act.cpp.

Classes

Functions

Variables

Detailed Description

Function Documentation

◆ init()

◆ stop()

◆ run()

◆ onStartup()

◆ onCleanup()

◆ psInit()

◆ publish_()

◆ tick()

◆ getQueueMin()

◆ poolInit()

◆ poolGetMaxBlockSize()

◆ getPoolMin()

◆ newX_()

◆ gc()

◆ newRef_()

◆ deleteRef_()

◆ q_new()

◆ q_new_x()

◆ q_new_ref()

◆ q_delete_ref()

◆ newXfromISR_()

◆ gcFromISR()

◆ bzero_()

Variable Documentation

◆ NO_MARGIN

◆ priv_