Dispatcher Class Reference

The dispatcher dispatches threads and, by that, puts the scheduler's decisions into action. More...

#include <thread/dispatcher.h>

Inheritance diagram for Dispatcher:

Static Public Member Functions
static Thread *	active ()
	Returns the thread currently running on the CPU core calling this method.
static bool	isActive (const Thread *thread, unsigned *cpu=nullptr)
	Check if thread is currently active. More...
static void	go (Thread *first)
	This method stores first as life pointer for this CPU core and triggers the execution of first thread. More...
static void	dispatch (Thread *next)
	Updates the life pointer to next and issues a thread change from the old to the new life pointer. More...

Detailed Description

The dispatcher dispatches threads and, by that, puts the scheduler's decisions into action.

The dispatcher manages the life pointer that refers to the currently active thread and performs the actual switching of processes. For single-core systems, a single life pointer is sufficient, as only a single thread can be active at any one time. On multi-core systems, every CPU core needs its own life pointer.

Member Function Documentation

isActive()

static bool Dispatcher::isActive ( const Thread *  thread, unsigned *  cpu = nullptr  )

inlinestatic

Check if thread is currently active.

Parameters

thread	Pointer to the thread in question
cpu	will receive the core number if cpu pointer is not nullptr and the thread is currently active

Returns

true if currently running, false otherwise

Todo:

Implement method for kill IPI (in MPStuBS only)

go()

void Dispatcher::go ( Thread *  first )

static

This method stores first as life pointer for this CPU core and triggers the execution of first thread.

Note

Only to be used for the first thread running on a CPU core.

Parameters

first

First thread to be executed on this CPU core.

dispatch()

void Dispatcher::dispatch ( Thread *  next )

static

Updates the life pointer to next and issues a thread change from the old to the new life pointer.

Parameters

next	Next thread to be executed.

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The documentation for this class was generated from the following files:

• thread/dispatcher.h
• thread/dispatcher.cc