Laxity based message priority strategy. More...

#include <Dynamic_Message_Strategy.h>

Inheritance diagram for ACE_Laxity_Message_Strategy:

Collaboration diagram for ACE_Laxity_Message_Strategy:

Public Member Functions
	ACE_Laxity_Message_Strategy (unsigned long static_bit_field_mask=0x3FFUL, unsigned long static_bit_field_shift=10, unsigned long dynamic_priority_max=0x3FFFFFUL, unsigned long dynamic_priority_offset=0x200000UL)
	Ctor, with all arguments defaulted. More...

virtual	~ACE_Laxity_Message_Strategy (void)
	virtual dtor. More...

virtual void	convert_priority (ACE_Time_Value &priority, const ACE_Message_Block &mb)
	Dynamic priority conversion function based on laxity. More...

virtual void	dump (void) const
	Dump the state of the strategy. More...

Public Member Functions inherited from ACE_Dynamic_Message_Strategy
	ACE_Dynamic_Message_Strategy (unsigned long static_bit_field_mask, unsigned long static_bit_field_shift, unsigned long dynamic_priority_max, unsigned long dynamic_priority_offset)
	Constructor. More...

virtual	~ACE_Dynamic_Message_Strategy (void)
	Virtual destructor. More...

Priority_Status	priority_status (ACE_Message_Block &mb, const ACE_Time_Value &tv)
	Updates the message's priority and returns its priority status. More...

unsigned long	static_bit_field_mask (void) const
	Get static bit field mask. More...

void	static_bit_field_mask (unsigned long)
	Set static bit field mask. More...

unsigned long	static_bit_field_shift (void) const
	Get left shift value to make room for static bit field. More...

void	static_bit_field_shift (unsigned long)
	Set left shift value to make room for static bit field. More...

unsigned long	dynamic_priority_max (void) const
	Get maximum supported priority value. More...

void	dynamic_priority_max (unsigned long)
	Set maximum supported priority value. More...

unsigned long	dynamic_priority_offset (void) const
	Get offset to boundary between signed range and unsigned range. More...

void	dynamic_priority_offset (unsigned long)
	Set offset to boundary between signed range and unsigned range. More...

Additional Inherited Members
Public Types inherited from ACE_Dynamic_Message_Strategy
enum	Priority_Status { PENDING = 0x01, LATE = 0x02, BEYOND_LATE = 0x04, ANY_STATUS = 0x07 }

Protected Attributes inherited from ACE_Dynamic_Message_Strategy
unsigned long	static_bit_field_mask_
	This is a bit mask with all ones in the static bit field. More...

unsigned long	static_bit_field_shift_

unsigned long	dynamic_priority_max_
	Maximum supported priority value. More...

unsigned long	dynamic_priority_offset_
	Offset to boundary between signed range and unsigned range. More...

ACE_Time_Value	max_late_
	Maximum late time value that can be represented. More...

ACE_Time_Value	min_pending_
	Minimum pending time value that can be represented. More...

ACE_Time_Value	pending_shift_
	Time value by which to shift pending priority. More...

Detailed Description

Laxity based message priority strategy.

Assigns dynamic message priority according to laxity (time to deadline minus worst case execution time). The message priority is divided into high and low order bit fields. The high order bit field is used for dynamic message priority, which is updated whenever the convert_priority() method is called. The low order bit field is used for static message priority and is left unchanged. The partitioning of the priority value into high and low order bit fields is done according to the arguments passed to the strategy object's constructor.

Constructor & Destructor Documentation

ACE_Laxity_Message_Strategy::ACE_Laxity_Message_Strategy	(	unsigned long	static_bit_field_mask = `0x3FFUL`,
		unsigned long	static_bit_field_shift = `10`,
		unsigned long	dynamic_priority_max = `0x3FFFFFUL`,
		unsigned long	dynamic_priority_offset = `0x200000UL`
	)