Non-preemptive scheduling algorithms and schedulability conditions for real-time systems with precedence and latency constraints
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(2) INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE. Non-preemptive scheduling algorithms and schedulability conditions for real-time systems with precedence and latency constraints Liliana Cucu — Yves Sorel. N° 5403 Decembre 2004. N 0249-6399. ISRN INRIA/RR--5403--FR+ENG. Thème COM. apport de recherche.
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(52) # 0O.- # , /) S A# #L
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(54) #/0/ S = {s ∈ N, A ∈ V} %O. &#/ &
(55) .+ , A O
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(57) #/0/ (#/=#/)# *) / ;#/H0
(58) ,./ (# . E.O ./) E O%0 %H/ &/(0') J ( - 1 1 / ) ;#/=#/)# *)
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(70) # ( , 4 )& .O , .# 0 A. A. B. A. B. B. +. B) #/
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(75) # KO /O , /H E ,A / + (# . .#/ ( ( O
(76) #/O
(77) / /H , +*, # #/: O #/ , % 1 O !
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(80) ), . / = (# / O# , % /O #O'! / /)#/ , %O 1 L(C,B). B E A. B. B. C. E. E A. C. G. A G. D. G. D second pattern. first pattern. C. D. third pattern. first new pattern. second new pattern. svqxn`; OF u1ln`_ro!i s¤^¦XpNkn`_ pvr'km`_©v`_x2uv¢X-u1lml2` x2rk ÁÂÃ5ÁÅÄ.
(81) .
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(88) # / O , . ) O K%-=% , K # *) & E& % #) O ' 0/ ( , #) .O
(89) # 0O XY. Y. Y. X. X. Y. C. XY. ∀C,sX ≤sC ≤sY. V1 * )'!/A, '! B ∈M(A, %(#/) , E A .+,O#/ L 1 B) A,B ¾5¾ FI jl2[`.kni3k|l2` ^ stk>k2o&[`Y3q¢tu{¢`Hln[` r;ln[` x2`ysku1l>¢`_uNk|lukno&[`_3q¢`. pv>l2[`kmi3kmln`_^§<g3p°jpvxu¦k2o&[`_q¢¤` S :`d[-u²©v`. S. k2u1lnstkmi~sruv¢¤¢No!pvr-k|l2x2uvs¤r~l2k ?95 B. X`!l|::` `_§y`_o_Z\r u{q[Akn`;`¦l2uv[p{r\` pNlnxn[B`_`6^)uvrsu{k\xnlnst.xnu{p1`¦¢y©NpN[`_x2 u²©N` ` xY°«Pln[`pvX` x&u1lnspvCr-k;≤-`_¢¤δpNrvs(S)rln≤p LM(A,§B)gjp ^¡Pqkml¡X`kno&[`YC3q¢`_≤ L s^¦-Z\p~km[s`Lrµl2[ln` [pNstxnk¦`_^o!pvr-5¦3vsl2ss¤©vpN`_r kd:u`r`_No q`_u{k2x&knu{uvr~xni³ln`_`6o pvlnr[-3u1s¤l¦lnspv.r`opvu{xr u u{¢t¢u1:ln`_u²ri3o!kik2o&o![pv`Yr-3k|ql2x2¢` uvs¤r~Xld`!l|ln:p'` -`_r`6k2lnu1[l2`skm±±x&`_km5lL§Lu{:r-i δAB (S) ≤ LA,B. C∈M(A,B). A,B. Ãà ËMON P,Q%R. C. AB. A,B. C∈M(A,B). C.
(90) . LO,/
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(92) lno![pN`?rkm¢u{lnx&lnu{`_rsrNo!l;isto!k;pvs¤r-^¦k|l2Xx2pNuvkns¤`_r~«l_§° }uvr¢¤¢S¦l2l2[[`_`kn`;¢tuvknkmo&l.[pN`Y-3q`_x2¢`_u{k:lns¢pv`_r6uvp{«lnpLl2[ln`[¢t`du1l2k2`u{r^¦o `;i6kmo!` pvl\r-pvk|l2>x2pvuvXs¤r~` l_x&°~u1kml2`s¤pNl<rl2k:[knu1o&l\[.`Y3`¯qo ¢u{`_¢ ¢ 7|-^¦` l|sr.s¤`_^6` ruv¢Xlnkn[`!`dl\±o!pvx&k|x2l\x2`_pvknX-` pNx&ru13l2s¤spNrr l2pLlnb¯[`%r ¢tlnu1[l2`%` ro o pvir~lno!x&pNu{rx2k|i¦l2x2suv
(93) s¤-r~`l 8&l|.§ `_` rln[`Ykm`;pvX` x&u1l2s¤pNrk.ln[`_xn`;stk\u1l ¢¤`Yuvkml pvr`dpvX` x&u1l2s¤pNrX` ¢pvrNs¤r?lnp uv56rstp{kl2[pNr` x\¢iuvrs¤`Yx o!`YpNknr k2u{ x2[i so&? [³kn` uL`¦¢l2u{[ln` `_pNrxno!`_i^4o pv rB§³kmlnx&Z\u{[sr~stkl:ststk\ksX^LpNXk2kmpNskn`_¢ `l2-[`Y` o ruvqlnkm[``uvo!¢¤pv¢:r-kn3o&s[l2`_s¤pN3r q¢N`_s¤k_©N°` k2r u1l2~sikmijln[s¤r`_³pvx2ln` [^ ` -uvru{xn'lnstl2u{[¢<`?pN¢tx2uvkm` l;x?pvX`!` ±x&ru1ln`YsJpvrµjiJp{Hu®ln[v`?x&u{¢tu1l2[ ` rpvo x¡i® o!pv[r-so&k|[l2x2uv:s¤r~`l_pN°X3^6l2uvu²i³s¤ro!lnpv[r~`l&u{kms^6rµu{u{¢¢t¢km`_p kml¡pvlnXs`^¦x&u1` l2s¤XpN`!rl|k:X` `_` rJ¢pvrln[N`s¤r±x&lnk|p l uvkn`!rl&p{k
(94) l2p{[S` x\pvX` uvx&s¤u1x l2pNs¤pNr'r k
(95) kn[o&s[o&['`Y3u¦q¢¢t`_u1Lln`_Xr`!o!l|i :o!` pv` r-r?k|lnl2[x2uv` s¤±r~l\x&k|slHk pvsX^¦` -x&u1p~l2kms¤`YpN«rL§yuv}r¢¡¢«l2ln[[`_` kn¢t`uvkmknlyo&[pv`_X3` qx&¢u1`_l2k\s¤pN¢r¡`_uNp{Xl2lnp[` 3¢s u{Xln`_` xnr-`_o!rNi l o pvrZ\kmln[x&u{`dsr~±l_x&°3kml kn`!o l2pvk:rl2kn[` u1~lq`_:r`o!`¯o uvp{¢¤O¢ ln7m[^¦`Ys¤kmr`;s¤^6srNu{l2¢5` x2kn`!l&x2k `!l2o!u{pNlnxnspvx2`_rknk.-p{pNrln3[sr`_pv?x2ln` pL^ ln[5;`%stk<¢tu1l2l2[` `ro o!i pNxno pNpv¢¤¢tru{kmx2ln>i x&u{5dsr~o 9l pv8r§ o ` x2rs¤r l2o [pv`rkmo lnuNx&u{km`Lsr~p{l s^¦u'-kmp~i3kmkm`Yln¡`_^fpNr? udsl2[ u{spvx
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(97) ln` r-uvo!s¤i x pNuvrr km[q3st´o&[ o s¤u?`_rN¢tu1lYln§ `_ro!io pvrkmlnx&u{sr~l.stk:s¤^¦XpNkn`_u{rln[`;o!pNr3s¤lnspvrNs¤©N` r ~i¦l2[` pNxn`_^ 5¯stk:r`_o `_k2knuvxni * #J!
(98) #.O KO'! # %-= # O - )#/< ¾ ¾ ( ( 3 » , /% .#OK,)& @%-=G%< = (V,E) @%-=%< .O ./)# *) )@#(O -A )& @(A,%B) #) ' 0/ ( , ,) .O , .# 0* )'!/'! 1< M(A, B) %(#/) A .+O# L 1 A,B ¾5¾ FI «:` [u²©v` pNr¢¤i?pvr` ¢tu1l2` ro i?o pvrkmlnx&u{sr~lHln[`_rk|l2q3ijs¤r;ln[`k2o&[`Y3q¢tu{s¢¤s¤l|i¡pv-l2[`kni3k|l2` ^. -± uv^¦x2[kmspvlyo&q['u{r~rl2l2¡[kd`lnl2[pµ¢t` u1lno!¢t`_uvpNrkmrlHo!knispv3Xo!`_` pNxx&ru1u{k|l2¢l2¢<s¤x2pNuvk2r¡o&s¤r~[p{l`_-3stlnkq[¢¤` s`Y^¦k¢tu1-knl2p~u{` kmrln`Ysto k|«i¡§ijo!sI rpNrr'3km` lnln`Y[x&u{`srNpvl
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(101) # ,O @ #= #) )#/< - O%
(102) #/O 1 & !
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(143) ±x&u¦kml\¢tu1pNl2-` r`_x2o u{i lnso!pvpNr'rkmu{lnrx& u{srNXl `!:pvx2`;`dqlnr[3`%`_¢tx2uvkmkml2l uvrpv«X°3` x&pNu1xl2s¤kmpNpNr ^¦pv`>lnkn[o&[`%`Y¢3u{qln`¢`vr-°3o!l2iv[§ `%pvX` x&u1l2s¤pNrk k2o&[`_3q¢¤`Y Ãà ËMON P,Q%R.
(144) 5Y . LO,/
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(149)
(150) "!$# !" %&'#( )#+*, -$./ /0/. 5+5. `;pv
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(155) ¢tu1sl2^¦` r-o p~i km`Yo!LpNrpvr6kmlnx&u{uvss¤rNx&l&k
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(157) x?s^Lpvr XpN-knu{`_sk
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(159) 5². LO,/
(160) . .º%O O# A, B ∈ V (* / /.O< ,
(161) *#/- 0/ *. )#/"! " ! @#@ %O-= % ,& #! = . ,* - # !/ .#. G = (V, E) - ,& / O# s +PC(A,<B)s ∈+PC1 - / @O# Ss ∈+SC < s + C 1 ) S 0 ∀H &6∈ M(A, , ,) B) O .O ) , H %O.> &#/ H∃H 6∈AM(A,AB) /H& s0 + CB < sB0 + CH < sH0 + C -L& δ (S) ≤ δ (S 0 ) S0 ∀S 0 ∈ S 0. 1. A. A. H. H. B. B. AB. AB. :`<[u²©N` su{x2`;+Ckno&[`Y<3qs¢`_+CxnpN^ ° Np x\ .¾5l2p ¾`dd[.u²©v`Yu{` o ruvs qkm.`+`;SC[stu²k©Nu¯<` kno&s[`_3+qC¢`.knq°3o&pv[%rl2¢i6[u1pvl X∀H` x&u1l26∈s¤pNrM(A, k:-`_¢¤pNB)rv°{sr`_?sl2[lnp` x
(162) M(A, B) s s X ?C B C δ (S) = pvx6knpv^¦`k2o&[`Y3q¢` S §H∈¨S`%[-°.u²¢¤©v` `l N = {H ∈ V knqo&[ l2[u1l H 6∈ M(A, B) u{r s + C < s +C <s +C } X X ? + B δ (S ) = C + C , ∀S ∈ S :i knq3l2x2uN§ ol2s¤s¤rruv¢¤ln¢i[`³:` `;~[qu²u1©vl2`s¤pNr$k ?C+ B¦u{r ? B!°\.`° pv3l&u{sr δ§yZ\[(S`;¢)` ^¦−^6δ u¦sk\(S)x2p1=©v`Y P C ≥ 0,∀S ∈ S δ (S) ≤ δ (S ) ∀S ∈ S .º& / #/= / ),/ T
(163) # 0O A, B, C # D ∈ V - ) (A, B) 8:8 (C, D) ) (A, B) = (C, D) M(A, B) M(C, D) = ∅ 1 ¾5 ¾ ¦¨£`%xnp1©N`¯jio pvr~lnx&uvso!lnspvrl2[u1ls¤ (A, B) = (C, D) ln[`_r M(A, B) T M(C, D) = ∅ § ¨£`Lknq°.X`%pNkn[-`?u²ln©v[` u{l ∃F ∈ M(A, B) T M(C, D) §:`Yo u{q-km` F ∈ M(A, B) °«x2`_knX`_ol2s¤©N` ¢i F ∈ M(C, D) ? " B P (A, F ) ∈ P uvr ?D B P (F, B) ∈ P x2`_knX`_ol2s¤©N` ¢i ? +B P (C, F ) ∈ P uvr ? /B P (F, D) ∈ P §PpNrH`LZ\xn[u1pNstl2^ k:[®sk.?" x2spvB:r ^fuvo!rpNur~ln-?x&u{uvBs3x¯°stoxnl2l2`Yps¤kmpNXl2r[`_o!`L lnsp{s©vl2ln[` [¢`ivl2x;[°~`dx2pvu{^s`!x;±u{r?Drs¤lnB:®spvu{lnrr[ p{`_xn5?`L "x2` Bs¢tkd°3u1:l2rs¤p`¯pNrEpN3u{='l2lnuv[® s¤r [x2sPpvo&[^¸(A,knl2u²[i3D)`LkHl2¢uN∈[k|u1l;Pl:lnu{[u{rs` xdx2`¯lnPp stk\(C,lnu1[l.`?B)¢±`_uNx&k|k|∈ll r-p{u{l\sx_ln§:x2¨q``¡u{[r-u²©v`:`;u6[o pvu²©vr~`lnx&uv3stol2s¤pNr³kmTp¦l2[`?knqXpNknsl2s¤pN§ rln[u{lln[`_xn`¡sk F ∈ M(A, B) T M(C, D) stk Z\[`dx2pjp{5pNx<l2[`%o M(A, uvkn`pv>B)x2` ¢tu1lnsM(C, pvCr 8:8~stk\D)kms^¦=s¤¢t∅u{x.lnp¦o uNkm`¯p{>x2` ¢tu1l2s¤pNr A§Z\[`d¢¤`_^¦^¦u?stk.xnp1©N`_ H. B. A. B. H. H. A. A. H. B. I. AB. I∈M(A,B). 0. 0 H. H. 0 B. 0. 0 A. AB. 0. I. H. AB. AB. AB. 0. 0. H∈N. I∈M(A,B). 0. A. B. 0. 0. 0. 0. AB. H∈N. H. ÁÂÃ5ÁÅÄ.
(164) 5Y.
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(166) slnr~[l u{L(C, { u s ' r v u j r i v p D) M(A, B) M(C, D) l2o_p6uvknu¡`_k_¢t°~u1lnl2[` r`%o ^¦iso!rpNs¤^6rk|uvl2¢>x2uvkms¤` r~ll o!o!pNpNxnrNx2l&`_u{kn-srpNk:rpv3r=sr¢i6∅pvl2Bp6X§'` `_Z\x&uNu1[o&l2[ss¤k¡pN¢trs¤u1^¦k:ln`_-r`_¢o!s¢¤`_pNi k%ro!vl2pv[sr-ru1k|?l?l2x2ln`_uvpLuvs¤o&r~ln[ [l ssk^¦k\o sstrpv3rs¤`_^6rNkmlnl2uvx&s¢.o_u{u{sknr~¢D`!§l_l?°jo kmpvpLx2xnpN`Yx.kmXl2pv[r`;l|s¤:rp ºj¾ º , G = (V, E) *. #4!
(167) #.O K"! # %-= # # / #/ .-( / '0 # ,,- %
(168) #0 #
(169) O= - #/
(170) O , :
(171) )# 0 8:8 - ,& '= ' # , # & @)#/< -E /% .#O ) #/ E -A ) X C ≤ L -),/ #/ A1 # B #/C'! #A)# ,,H AB H∈M(A,B) /% .#O 1 ¾5¾ 6Z\[`;¢` ^¦^6u$;5 kn[p1k.ln[-u1l_°jpNx\l|.p¦pN-`_x2u{lnspvrk A u{r- B xn`_¢u{ln`YjiuLu{ln[5°k2o&[`Y3q¢s¤r. pNZ\r[¢si?kpN^¦-`_`_x2uvu{rlnkspvl2r[k<u1 l'[s¤Lso&[u -kn`_o&¢¤[pN`Yr3%qln¢`vp °¯M(A, -pv` rl|.¢i·`_` pvr XA` x&u1lnl2p s¤pNBrk s¤¢¢S[3so&`_[ o xn-`Yuv`_kn¢¤pN`\rln[`dl2p ©1u{¢q`p{ δ (.)uvxn` § B) ¤ s r. [ s & o [ k 2o&s[¢¢C`Y§3Z\q¢[`_` x2`!-` pvl|x2.`¡`_uv` rr 'A-l2`Ypo uvBqkm°` 3pLrp{lk2u1l2sTkmiuL¢u{ln`_ro!io pvr°-kmlnpvx&xdu{su{r~¢l¢-Lu{sx2k °j l2[[` sr'o&[µruvp¦xn`¡p{M(A, l2s¤[r®` x x2` k2¢to&u1B)[l2`_s¤pNrq¢¤8:` 8 pl2N[x;stk\s¤r l|ijx2-` ¢t`Nu1§ lnspvr = ? ¢¤`_^¦^¦u 56u{r-M(A, µ¢` ^¦^6B)u³ BM(C, °>xnpN^ D)rp1= ∅pNr5°5:`¦ s¤¢¢yo!pNrkmst3`_x%pvr¢i®kno&[`_3q¢`_k;pv } [u²k2©jo&s¤[r`_Jqu ¢¤` ¢tu1Sl2` rknou{ilnstk|o!±-pN`_rk¦k|l2u{x2¢uv¢\s¤r~ln[l4`³? ¢tu1`!l2±` rrs¤o lnispvr o!pN+rBk|§l2x2uv:s¤r~`_l&o_k?u{qs¤%kn` u{r¶pvr¢is¤ δ ≤° ` Ls¤ln[` x° :∀A`'[u{u²r-©v ` ∀B °5pvxd.`L[u²©N` s X °Sln[∀H`_r£u6∈ knM(A, o&[`_3q¢B)` S k2u1lnstkm±`_k;u{¢¢ln[` s +C < s +C +C < s +C ¢tu1l2` ro iµo!pNrkmlnx&u{srNl&k;suvrµpNr¢iµs¤ °pvxuv¢¤¢ A u{r B [u²©jsr³u ¢tu1l2` ro i C ≤L o pvrkmlnx&u{sr~l_§
(172) Z\[`;ln[` pvx2` ^0sk\x2p1©v`Y. º 3 O , & >)#/< - /% .#O # . $ . ,)#/0/+8:8 . ,)#/0/ = -@& >EO # @ %
(173) , / /"! <4#:)# ,,-4 O%
(174) #/O .+,O#/H<:O ( , #) .O
(175) # 0O * )'!/'!4 > AB. AB. AB. H. H. A. A. B. B. H. H. AB. H. AB. H∈M(A,B). # ,,- O%
(176) #/O 1 O % O# % ,)A "#/) '%
(177) # , &' / #) 1 %( º ' '#/) '%
(178) # , & # * - / 0 ), #E%-=%< D#)
(179) # 0O /H&J# ,,- /% .#O(
(180) )# 0 8:8 . ,)#/0/ = O !
(181) #.O ! , !
(182) / /%0 & )#/< - /% .#O L(A, C) - L(D, F ) - L(H,1 I) #/ - . % O . = - - L(J, L) , /E#/ (A, C) - (D, F ) - (H, I) # -K
(183) , , - - (J, L) 1 '@ )# ,,- O%
(184) #/O #/
(185) A. +O# # = 1, ∀A ∈ V 1 E @ /0 &#/ # #/ # . ,& @>
(186) )# 0B 8:8 -L & @>
(187) )# 0' = 1 3 O @, C A . / ) # * . / . 0 $ . 0 ,. @ & / # L ) # ,. , 0 ,. E ' % L . *. !
(188). # ,. . & / # & @. % # ). ' . , 0 % , ) .O
(189) # 0O 1 ( :% O= &#/E&' / 0 :#/ &
(190) #() # /. * / 0.4# , = %- O%
(191) #/O # )& %-= 1 !/
(192) ! %%O 4#( 1 .
(193) . I r6pNx2` x
(194) lnp%xn`Ykm`_rNlHl2[`x2`_knq¢¤l2kyo pvro ` x2rs¤rkmi3kmln` ^6kH s¤ln[6¢tu1l2` ro i?o pvrkmlnx&u{sr~l2k
(195) s^LXpNkn`_¦pNr¦u{sx2k. sr'xn`_¢u{lnspvr"A°.`;sr~lnx2pjqo!`;l|:p?r` rp{l&u1lnspvr-k § ÃÃ ËMON P,Q%R.
(196) 5_ . LO,/
(197) . L(A,C) A. B. C. L(D,F) D. E. F L(H,I). G. H. I. L(J,L) J. K. L. svqx2` F<gji3kmln`_^¦k\pvpN-`_x2u{lnspvrk:¢tu1l2` ro io!pNrk|l2x2uvs¤r~l&k.sr'xn`_¢u{lnspvr98:8pvx\sr'xn`_¢u{lnspvr. t=0. t=1. A. t=2. B. =. t=3. C. D. E. F. G. J. K. L. H. I. svqx2` Fyg3o&[`Y3q¢`%knu{lnstk|ijsr6u{¢¢>o!pNrk|l2x2uvs¤r~l\p{ln[`kni3k|l2` ^. ÁÂÃ5ÁÅÄ.
(198) 5².
(199) "!$# !" %&'#( )#+*, -$./ /0/. ->u{s¤ªNsx:`.>[-s`!r?luvk\ln(A,[pv`\XB), `x&x2u1` l2©j(C,s¤spNpvrqk:D)k
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