Strong APA Scheduler

Strong APA Scheduler. More...

Files
file	schedulerstrongapa.h
	Strong APA Scheduler API.
file	schedulerstrongapa.c
	Strong APA Scheduler Implementation.

Data Structures
struct	Scheduler_strong_APA_Context
	Scheduler context specialization for Strong APA schedulers. More...
struct	Scheduler_strong_APA_Node
	Scheduler node specialization for Strong APA schedulers. More...

Macros
#define	SCHEDULER_STRONG_APA_ENTRY_POINTS
	Entry points for the Strong APA Scheduler. More...

Functions
void	_Scheduler_strong_APA_Initialize (const Scheduler_Control *scheduler)
	Initializes the scheduler. More...
void	_Scheduler_strong_APA_Node_initialize (const Scheduler_Control *scheduler, Scheduler_Node *node, Thread_Control *the_thread, Priority_Control priority)
	Initializes the node with the given priority. More...
void	_Scheduler_strong_APA_Block (const Scheduler_Control *scheduler, Thread_Control *the_thread, Scheduler_Node *node)
	Blocks the thread. More...
void	_Scheduler_strong_APA_Unblock (const Scheduler_Control *scheduler, Thread_Control *the_thread, Scheduler_Node *node)
	Unblocks the thread. More...
void	_Scheduler_strong_APA_Update_priority (const Scheduler_Control *scheduler, Thread_Control *the_thread, Scheduler_Node *node)
	Updates the priority of the node. More...
bool	_Scheduler_strong_APA_Ask_for_help (const Scheduler_Control *scheduler, Thread_Control *the_thread, Scheduler_Node *node)
	Asks for help. More...
void	_Scheduler_strong_APA_Reconsider_help_request (const Scheduler_Control *scheduler, Thread_Control *the_thread, Scheduler_Node *node)
	Reconsiders help request. More...
void	_Scheduler_strong_APA_Withdraw_node (const Scheduler_Control *scheduler, Thread_Control *the_thread, Scheduler_Node *node, Thread_Scheduler_state next_state)
	Withdraws the node. More...
void	_Scheduler_strong_APA_Add_processor (const Scheduler_Control *scheduler, Thread_Control *idle)
	Adds the idle thread to a processor. More...
Thread_Control *	_Scheduler_strong_APA_Remove_processor (const Scheduler_Control *scheduler, struct Per_CPU_Control *cpu)
	Removes an idle thread from the given cpu. More...
void	_Scheduler_strong_APA_Yield (const Scheduler_Control *scheduler, Thread_Control *the_thread, Scheduler_Node *node)
	Performs a yield operation. More...

Detailed Description

Strong APA Scheduler.

This is an implementation of the global fixed priority scheduler (G-FP). It uses one ready chain per priority to ensure constant time insert operations. The scheduled chain uses linear insert operations and has at most processor count entries. Since the processor and priority count are constants all scheduler operations complete in a bounded execution time.

The the_thread preempt mode will be ignored.

Macro Definition Documentation

SCHEDULER_STRONG_APA_ENTRY_POINTS

#define SCHEDULER_STRONG_APA_ENTRY_POINTS

Value:

{ \
    _Scheduler_strong_APA_Initialize, \
    _Scheduler_default_Schedule, \
    _Scheduler_strong_APA_Yield, \
    _Scheduler_strong_APA_Block, \
    _Scheduler_strong_APA_Unblock, \
    _Scheduler_strong_APA_Update_priority, \
    _Scheduler_default_Map_priority, \
    _Scheduler_default_Unmap_priority, \
    _Scheduler_strong_APA_Ask_for_help, \
    _Scheduler_strong_APA_Reconsider_help_request, \
    _Scheduler_strong_APA_Withdraw_node, \
    _Scheduler_default_Pin_or_unpin, \
    _Scheduler_default_Pin_or_unpin, \
    _Scheduler_strong_APA_Add_processor, \
    _Scheduler_strong_APA_Remove_processor, \
    _Scheduler_strong_APA_Node_initialize, \
    _Scheduler_default_Node_destroy, \
    _Scheduler_default_Release_job, \
    _Scheduler_default_Cancel_job, \
    _Scheduler_default_Tick, \
    _Scheduler_SMP_Start_idle \
    SCHEDULER_OPERATION_DEFAULT_GET_SET_AFFINITY \
  }

Entry points for the Strong APA Scheduler.

Function Documentation

_Scheduler_strong_APA_Add_processor()

void _Scheduler_strong_APA_Add_processor	(	const Scheduler_Control *	scheduler,
		Thread_Control *	idle
	)

Adds the idle thread to a processor.

Parameters

	scheduler	The scheduler control instance.
[in,out]	The	idle thread to add to the processor.

_Scheduler_strong_APA_Ask_for_help()

bool _Scheduler_strong_APA_Ask_for_help	(	const Scheduler_Control *	scheduler,
		Thread_Control *	the_thread,
		Scheduler_Node *	node
	)

Asks for help.

Parameters

scheduler	The scheduler control instance.
the_thread	The thread that asks for help.
node	The node of the_thread.

Return values

true	The request for help was successful.
false	The request for help was not successful.

_Scheduler_strong_APA_Block()

void _Scheduler_strong_APA_Block	(	const Scheduler_Control *	scheduler,
		Thread_Control *	the_thread,
		Scheduler_Node *	node
	)

Blocks the thread.

Parameters

	scheduler	The scheduler control instance.
[in,out]	the_thread	The thread to block.
[in,out]	node	The node of the thread to block.

_Scheduler_strong_APA_Initialize()

void _Scheduler_strong_APA_Initialize

(

const Scheduler_Control *

scheduler

)

Initializes the scheduler.

Parameters

scheduler

The scheduler to initialize.

_Scheduler_strong_APA_Node_initialize()

void _Scheduler_strong_APA_Node_initialize	(	const Scheduler_Control *	scheduler,
		Scheduler_Node *	node,
		Thread_Control *	the_thread,
		Priority_Control	priority
	)

Initializes the node with the given priority.

Parameters

	scheduler	The scheduler control instance.
[out]	node	The node to initialize.
	the_thread	The thread of the node to initialize.
	priority	The priority for node.

_Scheduler_strong_APA_Reconsider_help_request()

void _Scheduler_strong_APA_Reconsider_help_request	(	const Scheduler_Control *	scheduler,
		Thread_Control *	the_thread,
		Scheduler_Node *	node
	)

Reconsiders help request.

Parameters

	scheduler	The scheduler control instance.
	the_thread	The thread to reconsider the help request of.
[in,out]	node	The node of the_thread

_Scheduler_strong_APA_Remove_processor()

Thread_Control* _Scheduler_strong_APA_Remove_processor	(	const Scheduler_Control *	scheduler,
		struct Per_CPU_Control *	cpu
	)

Removes an idle thread from the given cpu.

Parameters

scheduler	The scheduler instance.
cpu	The cpu control to remove from scheduler.

Returns

The idle thread of the processor.

_Scheduler_strong_APA_Unblock()

void _Scheduler_strong_APA_Unblock	(	const Scheduler_Control *	scheduler,
		Thread_Control *	the_thread,
		Scheduler_Node *	node
	)

Unblocks the thread.

Parameters

	scheduler	The scheduler control instance.
[in,out]	the_thread	The thread to unblock.
[in,out]	node	The node of the thread to unblock.

_Scheduler_strong_APA_Update_priority()

void _Scheduler_strong_APA_Update_priority	(	const Scheduler_Control *	scheduler,
		Thread_Control *	the_thread,
		Scheduler_Node *	node
	)

Updates the priority of the node.

Parameters

	scheduler	The scheduler control instance.
	the_thread	The thread for the operation.
[in,out]	node	The node to update the priority of.

_Scheduler_strong_APA_Withdraw_node()

void _Scheduler_strong_APA_Withdraw_node	(	const Scheduler_Control *	scheduler,
		Thread_Control *	the_thread,
		Scheduler_Node *	node,
		Thread_Scheduler_state	next_state
	)

Withdraws the node.

Parameters

	scheduler	The scheduler control instance.
[in,out]	the_thread	The thread to change the state to next_state.
[in,out]	node	The node to withdraw.
	next_state	The next state for the_thread.

_Scheduler_strong_APA_Yield()

void _Scheduler_strong_APA_Yield	(	const Scheduler_Control *	scheduler,
		Thread_Control *	the_thread,
		Scheduler_Node *	node
	)

Performs a yield operation.

Parameters

	scheduler	The scheduler control instance.
	the_thread	The thread to yield.
[in,out]	node	The node of the_thread.