thread scheduling and dispatching

7/24/2019 Thread Scheduling and Dispatching

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Thread Scheduling andDispatching

Maung Aung Han

Marc E. Loy

Jihua Zhong

CIS 642: Seminar in Real-ime Sy!em!

In!rucor: "ro#e!!or In!u$ Lee


2/75

Direction

Allo% an un&erlying !che&uling mechani!m o 'e u!e& 'y real-

ime Ja(a hrea&! 'u no !$eci#y in a&(ance he e)ac naure o#

all $o!!i'le !che&uling mechani!m!

Allo% im$lemenaion! o $ro(i&e unanici$ae& !che&ulingalgorihm!

"rogrammaic a!!ignmen o# $arameer! a$$ro$riae #or

un&erlying !che&uling mechani!m a! %ell a! $ro(i&ing any

nece!!ary #or creaion* managemen* an& erminaion o# hrea&!

"ro(i&e enough #le)i'iliy in hrea& !che&uling #rame%or+ oallo% #uure (er!ion! o# he !$eci#icaion o 'uil& on hi! relea!e

an& allo% he &ynamic loa&ing o# !che&uling $olicy mo&ule!


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Outline

I!!ue!

,e#iniion!

A"I

Sche&uler

Sche&ula'le '/ec! 0 Real-ime 1hrea&!

"arameer!


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Issues


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Issues: Threads

Muli-hrea&ing i! u!e#ul o

&ecou$le &i##eren aci(iie!

Aci(e o'/ec!* reue!

ueue!* !ynch0a!ynch Ho%e(er* %or+ in &i##eren

hrea&! com$ee! #or C"3

ime an& memory re!ource!

Mu! en!ure re!ource u!age

'y non-criical aci(iie! &oe!no iner#ere %ih nee&! o#

criical aci(iie!


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Issues: Release Characteristics

1o +no% %heher hrea&! %illiner#ere* nee& ocharacerie heir em$oral'eha(ior

5ee& &e!cri$or! %ih +eyem$oral ari'ue! E.g.,e)ecuion co!*

&ea&line

Can a'!rac ou !e$arae

&e!cri$or! #or canonical'eha(ioral cla!!e! I.e.,$erio&ic* a$erio&ic*

!$ora&ic

Time

execution cost

period

minimum inter-arrival spacing

deadline


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Issues: Release Failures

Relea!e characeri!ic!

a&(eri!e ho% hrea&! are

projectedo 'eha(e

Ho%e(er* &i##erence!'e%een $ro/ece& an&

acual 'eha(ior can lea& o

une)$ece& #ailure!

5ee& o 'e a'le o &eec

an& i# $o!!i'le han&le7relea!e #ailure!

Co! o(errun!

,ea&line mi!!e!

Time

actual execution cost

deadline

execution finished (late

pro!ected execution cost


8/75

Issues: Scheduling

"rioriie! 5ee& !u##icien unique

$rioriy le(el!

"reem$i(e !che&uling 5ee& %ell &e#ine& an&a$$ro$riae !emanic!

8airne!! among hrea&! i!no usuallya Real-1imeconcern 8I8 (!. RR7

9u may 'e u!e#ul 8ea!i'iliy

A&mi!!ion conrol*ceri#icaion0e!ing

scheduler

blocked

runnable

executing


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Issues: "riorit# Inversion "ro$lem

Con!i&er a lo% $rioriy $roce!! L an& a high$rioriy $roce!! H ha 'oh ha(e acce!! o acommon !hare& re!ource ha hey can onlyacce!! muual e)clu!i(ely

"icure a !cenario in %hich a high-$rioriyhrea& nee&! a loc+ in or&er o e)ecue* 'uhe loc+ i! 'eing hel& 'y a lo%er-$rioriy hrea&

1he lo%er-$rioriy hrea& i! $re(ening ahigher-$rioriy hrea& #rom e)ecuing


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Issues: "riorit# Inversion Solution

"rioriy Inheriance "roocol

I# hrea& :aem$! o acuire a loc+ ha i! hel& 'y a lo%er-$rioriyhrea& 2* hen 2;! $rioriy i! rai!e& o ha o# :a! long a! 2hol&!he loc+

"rioriy Ceiling Emulaion "roocol Highe! loc+er $roocol7 A monior i! gi(en a $rioriy ceiling %hen i i! creae&* %hich i! he

highe! $rioriy o# any hrea& ha coul& aem$ o ener he monior

A! !oon a! a hrea& ener! !ynchronie& co&e* i! $rioriy i! rai!e&o he monior;! ceiling $rioriy* hu! en!uring muually e)clu!i(e

acce!! o he co&e !ince i %ill no 'e $reem$e& 'y any hrea& hacoul& $o!!i'ly aem$ o ener he !ame monior

I#* hrough a $rogramming error* a hrea& ha! a higher $rioriy hanhe ceiling o# he monior i i! aem$ing o ener* hen an e)ce$ioni! hro%n


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Definitions


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Definitions

Sche&ula'le '/ec Sche&uling !cheme analogou! o hrea&!* a!+!*

mo&ule!* an& 'loc+!

Sche&ule Seuence or or&ering o# a !e o# hrea&!

Sche&uling0Sche&uling Algorihm "ro&ucion o# a !euence or or&ering #or he e)ecuion

o# a !che&ule 8ea!i'iliy Analy!i!

,eermine! i# a !che&ule ha! an acce$a'le (alue #orhe meric


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Definitions

1imely E)ecuion o# 1hrea&!

"rogrammer can &eermine 'y analy!i! o#

$rogram* e!ing $rogram on $aricularim$lemenaion!* or 'oh %heher $aricular

hrea&! %ill al%ay! com$lee e)ecuion

'e#ore a gi(en imeline!! con!rain

E)$re!!e& in relai(e or a'!olue erm!


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Definitions

"rioriy

Ineger a!!ociae& %ih a hrea& ha con(ey! o

he !y!em he or&er in %hich he hrea&! !houl&e)ecue

E)ecuion Eligi'iliy

,i!$aching

"orion o# he !y!em %hich !elec! he hrea&%ih he highe! e)ecuion eligi'iliy #rom he $ool

o# hrea&! ha are rea&y o run


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Threads and

Scheduling %"I


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Threads and Scheduling %"I

Sche&uler

Sche&ula'le 0 Realime1hrea&

"arameer!

Sche&uling"arameer!

Relea!e"arameer!

"roce!!ing


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Threads and Scheduling %"I

schedulerblocked runnable

executing

parameters

(cost& deadline& etc

parameters


parameters



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Class 'ierarch#Thread

RealtimeThread

Scheduing"arametersRelease"arameters

emor#"arameters

"riorit#"arameters

Importance"arameters

"eriodic"arameters %periodic"arameters

Sporadic"arameters

"rocessing)roup"arameters

*o'eapRealtimeThread


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Scheduler


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Scheduler

A'!rac cla!! Manage! he e)ecuion o#

!che&ula'le o'/ec! 8ea!i'iliy algorihm

May &eermine i# he +no%n !eo# !che&ula'le o'/ec!* gi(enheir $aricular e)ecuionor&ering or $rioriy a!!ignmen*i! a #ea!i'le !che&ule

$ional

Su'cla!!e! o# Schedulerareu!e& #or alernae !che&uling$olicie! an& !houl& &e#ine aninstance()cla!! meho& oreurn he &e#aul in!ance o# he!u'cla!!s

cheduler

blocked

runnable

executing


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"riorit#Scheduler

Cla!! ha e)en&!

Scheduler

Im$lemenaion #or $rioriy-

'a!e& !che&uling Calle& he base scheduler

,e#aul in!ance i! he

reuire& $rioriy !che&uler

8i)e& $rioriy* $reem$i(e

!che&uling %ih 2= uniue$rioriy le(el!

a$stract Scheduler

"riorit#Scheduler


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Threads + Schedula$le

O$!ects


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Schedula$le

Iner#ace ha e)en&!

java.lang.Runnable

'/ec! o# hi! y$e are

analogou! o threads* tasks*

modules* an& blocks

'/ec! o# hi! y$e are

manage& 'y Scheduler

1hree im$lemenaion! o#

Schedulable

RealTimeThread

NoHeapRealTimeThread

AsyncEventHandler

interface !ava,lang,Runna$le

interface Schedula$le


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Schedula$le

Each o'/ec i! a!!igne& $rioriy

re!ource! accor&ing o heir relea!e

characeri!ic!* e)ecuion eligi'iliy* an&$roce!!ing grou$ (aria'le!

Schedulingarameters

Releasearameters rocessing!rouparameters

"emoryarameters


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RealtimeThread

Cla!! ha e)en&!java.lang.Threadan&im$lemen! Scheduable

Inclu&e! cla!!e! an& meho&!

o ge an& !e $arameer o'/ec!menione& in Schedulable7

Mu! 'e $lace& in a memoryarea !uch ha Ja(a meho&! onjava.lang.Threadcom$leenormally e)ce$ %here !uch

e)ecuion %oul& cau!e acce!!(iolaion!

In!ance! may ha(e ane)ecuion eligi'iliy logicallylo%er han he gar'age collecor


!ava,lang,Thread

RealtimeThread

interface Runna$le


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Cla!! ha e)en&!

RealtimeThread

In!ance! ha(e an im$lici e)ecuion

eligi'iliy logically higher han he

gar'age collecor "ro(i&e& in or&er o allo% ime-

criical hrea&! o e)ecue in

$re#erence o he gar'age collecor

Memory acce!! an& a!!ignmen

!emanic! are &e!igne& o

guaranee ha he e)ecuion &oe!

no lea& o an incon!i!en hea$!ae

5e(er allo%e& o allocae or

re#erence any o'/ec allocae& in he

hea$ nor mani$ulae he re#erence

o# any o'/ec in he hea$


!ava,lang,Thread

RealtimeThread


interface Runna$le


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"arameters


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"arameters

Sche&uling"arameer!

Relea!e"arameer!

"roce!!ing


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Scheduling"arameters

A'!rac cla!!

"ro(i&e! he $arameer! u!e& in Sche&uler

Change! o he (alue! in hi! o'/ec a##ec!he !che&uling 'eha(ior o# all he

Scheduableo'/ec! o %hich i i! 'oun&

Im$lemenaion!:riorityarameters

#mportancearameters


30/75

"riorit#"arameters

Cla!! ha e)en&!

Schedulingarameters

In!ance! o# hi! cla!!

!houl& 'e a!!igne& ohrea&! ha are manage& 'y

!che&uler! %hich u!e a

!inger ineger o &eermine

e)ecuion or&er.

9a!e !che&ulerriorityScheduleri!

!uch a !che&uler

a$stract Scheduling"arameters

"riorit#"arameters


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"riorit#"arameters

Cla!! ha e)en&!

Schedulingarameters

In!ance! o# hi! cla!!

!houl& 'e a!!igne& ohrea&! ha are manage& 'y

!che&uler! %hich u!e a

!inger ineger o &eermine

e)ecuion or&er.

9a!e !che&ulerriorityScheduleri!

!uch a !che&uler

scheduler

blocked

runnable

executing

.

.

/ 0

1


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Cla!! ha e)en&!"rioriy"arameer!

A&&iional !che&uling

meric ha may 'e u!e&'y !ome $rioriy-'a!e&!che&uling algorihm!&uring o(erloa&con&iion! o

&i##ereniae e)ecuionor&er among hrea&! o#he !ame $rioriy

a$stract Scheduling"arameters


"riorit#"arameters


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Release"arameters

A'!rac cla!!


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Release"arameters

A'!rac cla!!


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"eriodic"arameters

Cla!! ha e)en&!Relea!e"arameer!

In&icae! ha he$ait%orNe&teriod()

meho& in he a!!ociae&Sche&ula'le o'/ec %ill 'eun'loc+e& a he !ar o# each$erio& start: ime a %hich he #ir!

$erio& 'egin!

period: iner(al 'e%een!ucce!!i(e un'loc+!

Inheri! cost* deadline*overrunHandler* an&missHandler#rom $aren

a$stract Release"arameters

"eriodic"arameters


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"eriodic"arameters

Cla!! ha e)en&!Relea!e"arameer!

In&icae! ha he$ait%orNe&teriod()

meho& in he a!!ociae&Sche&ula'le o'/ec %ill 'eun'loc+e& a he !ar o# each$erio& start: ime a %hich he #ir!

$erio& 'egin!

period: iner(al 'e%een!ucce!!i(e un'loc+!


Time

deadlinecost

period

start


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%periodic"arameters

Cla!! ha e)en&!

Relea!e"arameer!

Characerie! a

!che&ula'le o'/ec ha

may 'ecome aci(e a

any ime

Inheri! cost* deadline*

overrunHandler* an&missHandler#rom

$aren


%periodic"arameters


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Sporadic"arameters

Cla!! ha e)en&!A$eri&ioc"arameer!

5oice o he !che&uler hahe a!!ociae& !che&ula'le

o'/ec;! run meho& %ill 'erelea!e& a$erio&ically 'u %iha minimum ime 'e%eenrelea!e! minInterarrival: relea!e ime!

o# he !che&ula'le o'/ec %ill

occur no le!! han hi!iner(al



Sporatic"arameters

%periodic"arameters


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Sporadic"arameters

Cla!! ha e)en&!A$eri&ioc"arameer!

5oice o he !che&uler hahe a!!ociae& !che&ula'le

o'/ec;! run meho& %ill 'erelea!e& a$erio&ically 'u %iha minimum ime 'e%eenrelea!e! minInterarrival: relea!e ime!

o# he !che&ula'le o'/ec %ill

occur no le!! han hi! iner(al Inheri! cost* deadline*

overrunHandler* an&missHandler#rom $aren

Time

deadlinecost

minInterarrival


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Cla!!

A!!ociae& %ih one or

more !che&ula'le

o'/ec! #or %hich he

!y!em guaranee! ha

he a!!ociae& o'/ec!

%ill no 'e gi(en more

ime $er $erio& hanin&icae& 'y co!



period


41/75


start: ime a %hich he #ir! $erio&'egin!

period: iner(al 'e%een !ucce!!i(eun'loc+! o#$ait%orNe&teriod()

cost: $roce!!ing ime $er $erio& deadline: lae! $ermi!!i'le

com$leion ime mea!ure& #rom he!ar o# he curren $erio&

overrunHandler: in(o+e& i# he run7meho& o# he !che&ula'le o'/ec o#he $re(iou! $erio& i! !ill e)ecuinga he !ar o# he curren $erio&

missHandler: in(o+e& i# he run7meho& o# he !che&ula'le o'/ec i!!ill e)ecuing a#er he &ea&line ha!$a!!e&




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2xample


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Realtime Thread 2xample

$u'lic cla!! Recei(e1hrea& e)en&! Realime1hrea& >

$u'lic (oi& run7 >

0? logic #or recei(e hrea& ?0

@@

Realime1hrea& r ne% Recei(e1hrea&7B

i# r.geSche&uler7.i!8ea!a'le7hro% ne% E)ce$ionDhae(erFG7B

r.!ar7B


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Realtime Thread 2xample

Realime1hrea& r2 ne% Realime1hrea&7 >

$u'lic (oi& run7 >

0? logic #or recei(e hrea& ?0

@

@

Sche&uling"arameer! !$

ne% "rioriy"arameer!"rioriySche&uler.ge5orm"rioriynull77B

Realime1hrea& 2 ne% Realime1hrea&!$7 >

$u'lic (oi& run7 >0? hrea& logic ?0

@

@


45/75

Scheduler 2xample

$u'ic !aic Sche&uler #in&Sche&ulerSring $olicy7 >

Sring cla!!5ame Sy!em.ge"ro$eryD/a(a).realime.!che&ulerG $olicy7B

Cla!! claB

ry >

i# cla!!5ame null cla Cla!!.#or5amecla!!5ame77 null7 >

reurn Sche&uler7 cla.geMeho&Din!anceG* null7.in(o+enull* null7B

@

@ cach Cla!!5o8oun&E)ce$ion no8oun&7 >

@ cach 5oSuchMeho&E)ce$ion noSuch7 >

@ cach SecuriyE)ce$ion !ecuriy7 >

@ cach IllegalAcce!!E)ce$ion acce!!7 >

@ cach IllegalArgumenE)ce$ion arg7 >@ cach In(ocaion1argeE)ce$ion arge7 >

@

reurn nullB

@


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Scheduler 2xampleSche&uler !che&uler #in&Sche&ulerDE,8G7B

i# !che&uler null7 >

Realime1hrea&

ne% Realime1rea&

null* 00 !che&uling $aram

ne% "erio&ic"arameer! 00 relea!e $aram

null* 00 !ar

ne% Relai(e1ime* 7* 00 $erio&ne% Realai(e1imeK* 7* 00 co!

ne% Relai(e1imeK* 7* 00 &ea&line

null* 00 o(errunHan&ler

null7* 00 mi!!Han&ler

null* 00 memory $aram

null* 00 memory area

null7 > 00 grou$ $aram

$u'lic (oi& run7 > 00 runna'le logic0? hrea& $roce!!ing ?0

@

@


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Scheduler 2xample

ry >

Sche&uler.!e,e#aulSche&uler!che&uler7B

@ cach SecuriyE)ce$ion !ecuriy7 >

@

'oolean u!eE,8 #al!eB

ry >

i# Sche&uler.ge,e#aulSche&uler7.ge"olicy5ame7.eual!DE,8G77 >

u!eE,8 rueB

@


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"rocessing)roup 2xample

Sche&uling"arameer! $$

ne% "rioriy"arameer!"rioriySche&uler.ge5orm"rioriy77B

"roce!!ing


49/75


Realime1hrea&

ne% Realime1hrea&

$$* 00 $rioriy $arameer!

ne% A$erio&ic"arameer! 00 $erio&ic $arameer!

ne% Relai(e1ime* 7* 00 co!ne% Relai(e1ime* 7* 00 &ea&line

null* 00 co! o(errun han&ler

null7* 00 &ea&line mi!! han&ler

null* 00 memory $arameer!

null* 00 memory

grou$7 > 00 grou$ $aramer!$u'lic (oi& run7 >

0? &o hrea& a!+ ?0

@

@


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Realime1hrea& 2

ne% Realime1hrea&

$$* 00 $rioriy $arameer!

ne% A$erio&ic"arameer! 00 $erio&ic $arameer!

ne% Relai(e1imeK* 7* 00 co!ne% Relai(e1ime2* 7* 00 &ea&line

null* 00 co! o(errun han&ler

null7* 00 &ea&line mi!! han&ler

null* 00 memory $arameer!

null* 00 memory

grou$7 > 00 grou$ $aramer!$u'lic (oi& run7 >

0? &o hrea& a!+ ?0

@

@


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!$.!e"rioriy


52/75

Ta3ea4a#s

S$eci#icaion* no an im$lemenaion

E)en!i'iliy

9ene#i! o# Ja(a


53/75

%"I Reference


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%"I Summar#

iner#ace Sche&ula'le e)en&! /a(a.lang.Runna'le

cla!! Realime1hrea& e)en&! /a(a.lang.1hrea& im$lemen! Sche&ula'le

cla!! 5oHea$Realime1hrea& e)en&! Realime1hrea&

a'!rac cla!! Sche&uler

cla!! "rioriySche&uler e)en&! Sche&uler

a'!rac cla!! Sche&uling"arameer!

cla!! "rioriy"arameer! e)en&! Sche&uling"arameer!

cla!! Im$orance"arameer! e)en&! "rioriy"arameer!

a'!rac cla!! Relea!e"arameer!

cla!! "erio&ic"arameer! e)en&! Relea!e"arameer!

cla!! A$erio&ic"arameer! e)en&! Relea!e"arameer!

cla!! S$ora&ic"arameer! e)en&! A$erio&ic"arameer!

cla!! "roce!!ing


55/75

Scheduler

Syntax:

$u'lic a'!rac cla!! Sche&uler

Constructor:

$u'lic Sche&uler7


56/75

Scheduler ethods

$roece& a'!rac (oi& a&&1o8ea!i'iliySche&ula'le !che&ua'le7

$u'lic 'oolean changeI#8ea!i'leSche&ula'le !che&ula'le*

Relea!e"arameer! relea!e* Memory"arameer!* memory7

$u'lic !aic Sche&uler ge,e#aulSche&uler7

$u'lic a'!rac /a(a.lang.Sring ge"olicy5ame7

$u'lic a'!rac 'oolean i!8ea!i'le7

$roece& a'!rac (oi& remo(e8rom8ea!i'iliySche&ula'le !che&ula'le7

$u'lic !aic (oi& !e,e#aulSche&ulerSche&uler !che&uler7


57/75

"riorit#Scheduler

Syntax:

$u'lic cla!! "rioriySche&uler e)en&!

Sche&uler

Constructor:

$u'lic "rioriySche&uler7


58/75

"riorit#Scheduler ethods

$roece& (oi& a&&1o8ea!i'iliySche&ula'le !7

$u'lic 'oolean changeI#8ea!i'leSche&ua'le !che&ula'le* Relea!e"arameer!relea!e* Memory"arameer! memory7

$u'lic (oi& #ireSche&ula'leSche&ua'le !che&ula'le7

$u'lic in geMa)"rioriy7

$u'lic !aic in geMa)"rioriy7

$u'lic !aic in geMa)"rioriy/a(a.lang.1hrea& hrea&7

$u'lic in geMin"rioriy7

$u'lic !aic in geMin"rioriy/a(a.lang.1hrea& hrea&7

$u'lic in ge5orm"rioriy7

$u'lic !aic in ge5orm"rioriy/a(a.lang.1hrea& hrea&7$u'lic /a(a.lang.Sring ge"olicy5ame7

$u'lic !aic "rioriySche&ular in!ance7

$u'lic 'oolean i!8ea!i'le7

$roece& (oi& remo(e8rom8ea!i'iliySche&ula'le !7


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Schedua$le

Syntax:

$u'lic iner#ace Sche&ula'le e)en&! /a(a.lang.Runna'le


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Schedua$le ethods

$u'lic (oi& a&&1o8ea!i'iliy7

$u'lic Memory"arameer! geMemory"arameer!7

$u'lic Relea!e"arameer! geRelea!e"arameer!7

$u'lic Sche&uler geSche&uler7$u'lic Sche&uling"arameer! geSche&uling"arameer!7

$u'lic (oi& remo(e8rom8ea!i'iliy7

$u'lic (oi& !eMemory"arameer!Memory"arameer! memory7

$u'lic (oi& !eRelea!e"arameer!Relea!e"arameer! relea!e7

$u'lic (oi& !eSche&ulerSche&uler !che&uler7

$u'lic (oi& !eSche&uling"arameer!Sche&uling"arameer!7


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RealtimeThread

Syntax:

$u'lic cla!! Realime1hrea& e)en&! /a(a.lang.1hrea& im$lemen!Sche&ula'le

Constructors:

$u'lic Realime1hrea&7

$u'lic Realime1hrea&Sche&uling"arameer! !che&uling7

$u'lic Realime1hrea&Sche&uling"arameer! !che&uling*Relea!e"arameer! relea!e7

$u'lic Realime1hrea&Sche&uling"arameer !che&uling*Relea!e"arameer! relea!e* Memory"arameer! memory*MemoryArea area* "roce!!ing


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RealtimeThread ethods

$u'lic (oi& a&&1o8ea!i'iliy7

$u'lic !aic Realime1hrea& currenRealime1hrea&7

$u'lic !ynchronie& (oi& &e!che&ule"erio&ic7

$u'lic MemoryArea geMemoryArea7$u'lic Memory"arameer! geMemory"arameer!

$u'lic "roce!!ing


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RealtimeThread ethods

$u'lic (oi& remo(e8rom8rea!i'iliy7

$u'lic !ynchronie& (oi& !che&ule"erio&ic7

$u'lic (oi& !eMemory"arameer!Memory"arameer! $arameer!7

$u'lic (oi& !e"roce!!!ing


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Syntax:

$u'lic cla!! 5oHea$Realime1hrea& e)en&! Realime1hrea&

Constructors:5oHea$Realime1hrea&Sche&uling"arameer! !che&uling*

MemoryArea area7

5oHea$Realime1hrea&!che&uling"arameer! !che&uling*

Relea!e"arameer! relea!e* MemoryArea area7

5oHea$Realime1hrea&Sche&uling"arameer! !che&uling*Relea!e"arameer! relea!e* Memory"arameer! memory*

MemoryArea area* "roce!!ing


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Scheduling"arameters

Syntax:

$u'lic a'!rac cla!! Sche&uling"arameer!

Contructor:

$u'lic Sche&uling"arameer!7


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"riorit#"arameters

Syntax:

$u'lic cla!! "rioriy"arameer! e)en&! Sche&uling"arameer!

Constructor:$u'lic "rioriy"arameer!in $rioriy7

Methods:

$u'lic in ge"rioriy7

$u'lic (oi& !e"rioriyin $rioriy7

$u'lic /a(a.lang.Sring oSring7


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Syntax:

$u'lic cla!! Im$orance"arameer! e)en&! "rioriy"arameer!

Constructor:$u'lic Im$orance"arameer!in $rioriy* in im$orance7

Methods:

$u'lic in geIm$orance7

$u'lic (oi& !eIm$orancein im$orance7

$u'lic /a(a.lang.Sring oSring7


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Release"arameters

Syntax:

$u'lic a'!rac cla!! Relea!e"arameer!

Constructor:

$roece& Relea!e"arameer!Relai(e1ime

co!* Relai(e1ime &ea&line*A!yncE(enHan&ler o(errunHan&ler*

A!yncE(enHan&ler mi!!Han&ler7


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Release"arameters ethods

$u'lic Relai(e1ime geCo!7

$u'lic A!yncE(enHan&ler geCo!(errunHan&er7

$u'lic Relai(e1ime ge,ea&line7

$u'lic A!yncE(enHan&ler ge,ea&lineMi!!Han&ler7

$u'lic (oi& !eCo!Relai(e1ime co!7

$u'lic (oi& !eCo!(errunHan&lerA!yncE(enHan&lerhan&ler7

$u'lic (oi& !e,ea&lineRelai(e1ime &ea&line7$u'lic (oi& !e,ea&lineMi!!Han&lerA!yncE(enHan&ler

han&er7


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"eriodic"arameters

Syntax:

$u'lic cla!! "erio&"arameer! e)en&! Relea!e"arameer!

Constructor:

$u'lic "erio&ic"arameer!HighRe!oluion !ar* Relai(e1ime $erio&*Relai(e1ime co!* Relai(e1ime &ea&line* A!yncE(enHan&lero(errunHan&ler* A!yncE(enHan&ler mi!!Han&ler7

Methods:

$u'lic Relai(e1ime ge"erio&7$u'lic HighRe!oluion geSar7

$u'lic (oi& !e"erio&Relai(e1ime $erio&7

$u'lic (oi& !eSarHighRe!oluion !ar7


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%periodic"arameters

Syntax:

$u'lic cla!! A$erio&ic"arameer! e)en&!

Relea!e"arameer!

Constructor:

$u'lic A$erio&ic"arameer!Relai(e1ime co!*

Relai(e1ime &ea&line* A!yncE(enHan&ler

o(errunHan&ler* A!yncE(enHan&ler mi!!Han&ler7


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Sporadic"arameters

Syntax:

$u'lic cla!! S$ora&ic"arameer! e)en&! A$erio&ic"arameer!

Constructor:$u'lic S$ora&ic"arameer!Relai(e1ime minIner(al* Relai(e1ime

co!* Relai(e1ime &ea&line* A!yncE(enHan&ler

o(errunHan&ler* A!yncE(enHan&ler mi!!Han&ler7

Methods:

$u'lic Relai(e1ime geMinimumInerarri(al7

$u'lic (oi& !eMinimumInerarri(alRelai(e1ime minimum7


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Syntax:

$u'lic cla!! "roce!!ing


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"rocessing)roup"arameters ethods

$u'lic Relai(e1ime geCo!7

$u'lic A!yncE(enHan&ler geCo!(errunHan&ler7

$u'lic Relai(e1ime ge,ea&line7

$u'lic A!yncE(enHan&ler ge,ea&lineMi!!Han&ler7

$u'lic Relai(e1ime ge"erio&7

$u'lic HighRe!oluion1ime geSar7

$u'lic (oi& !eCo!Relai(e1ime co!7

$u'lic (oi& !eCo!(errunHan&lerA!yncE(enHan&ler han&ler7

$u'lic (oi& !e,ea&lineRelai(e1ime &ea&line7$u'lic (oi& !e,ea&lineMi!!Han&lerA!yncE(enHan&ler han&ler7

$u'lic (oi& !e"erio&Relai(e1ime $erio&7

$u'lic (oi& !eSarHighRe!oluion1ime !ar7


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Reference

h$:00%%%.r/.org0

thread scheduling and dispatching

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