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L  z ?,Content Placeholder 2@`  Enable CHESS on real-world applications IE, Firefox, Office, Apache, & Capture all sources of nondeterminism Required for reliably reproducing errors Ability to explore these nondeterministic choices Required for finding errors(   & )  2  (&  )2  ` @` I}OPMy___PPT10Y+D=' = @B +   2 * P (  P P  ^0e?Title 1"SMPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!' drs/shapexml.xmlVMo0 t:'A-F-m@Puz.hYnȔ!Y_?JM||$%jͶ:e0#$ S*g ʌ5Ko$qb-kpM#t5xz7IcSZ'0A!+I\l2j R^K6IL/ظ /I|滥b$" a A5]Ƨtvu2: GYE~wj҂aA?e|6NbbmlƋA<6"j!EIM< \Lf#"R0~Ol#<ҡ=^dtB\`! \FAou|*,XsVjE~׳Cˬ%,nB#'q 9ijLմd xClQqdRcވ5b)<"[`F'|>E{ji-^<޿\ЄF(*HfHikU[QJg\UNOMC^x6H!†`ՆM%6҆탦34Ma#Є՝_ pR95rGLK ]k ќ+)1ʦVeI ۏ$:nw+YURv=mp˱W @ R :pmǼxуt;U]Fo@0,\}];۟gGb tC'loy9,M/=5PK!}#Zdrs/downrev.xmlLMK1EBCx7b3ZشH~ { N^$vz qys9eoq&cw qJ񰾝Yc\(r1c];:c%C \Pd1\Ky1E_IKpqMEƖV5/MN6z7I1{9o=H}7O2W` |; L%PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!' *drs/shapexml.xmlPK-!}#Z=drs/downrev.xmlPKB@`}j  F>___PPT9  7Sources of Nondeterminism 1. Scheduling Nondeterminism"8 7$$7 P  z?,Content Placeholder 2@`  HInterleaving nondeterminism Threads can race to access shared variables or monitors OS can preempt threads at arbitrary points Timing nondeterminism Timers can fire in different orders Sleeping threads wake up at an arbitrary time in the future Asynchronous calls to the file system complete at an arbitrary time in the future  c     c   I ` @` I}OPMy___PPT10Y+D=' = @B +c   ~ v T^ (  T T  ^0e?Title 1"SMPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!' drs/shapexml.xmlVMo0 t:'A-F-m@Puz.hYnȔ!Y_?JM||$%jͶ:e0#$ S*g ʌ5Ko$qb-kpM#t5xz7IcSZ'0A!+I\l2j R^K6IL/ظ /I|滥b$" a A5]Ƨtvu2: GYE~wj҂aA?e|6NbbmlƋA<6"j!EIM< \Lf#"R0~Ol#<ҡ=^dtB\`! \FAou|*,XsVjE~׳Cˬ%,nB#'q 9ijLմd xClQqdRcވ5b)<"[`F'|>E{ji-^<޿\ЄF(*HfHikU[QJg\UNOMC^x6H!†`ՆM%6҆탦34Ma#Є՝_ pR95rGLK ]k ќ+)1ʦVeI ۏ$:nw+YURv=mp˱W @ R :pmǼxуt;U]Fo@0,\}];۟gGb tC'loy9,M/=5PK!}#Zdrs/downrev.xmlLMK1EBCx7b3ZشH~ { N^$vz qys9eoq&cw qJ񰾝Yc\(r1c];:c%C \Pd1\Ky1E_IKpqMEƖV5/MN6z7I1{9o=H}7O2W` |; L%PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!' *drs/shapexml.xmlPK-!}#Z=drs/downrev.xmlPKB@`}j  F>___PPT9  7Sources of Nondeterminism 1. Scheduling Nondeterminism"8 7$$72 T  z?,Content Placeholder 2@`  dxInterleaving nondeterminism Threads can race to access shared variables or monitors OS can preempt threads at arbitrary points Timing nondeterminism Timers can fire in different orders Sleeping threads wake up at an arbitrary time in the future Asynchronous calls to the file system complete at an arbitrary time in the future CHESS captures and explores this nondeterminism  c    0  c    0 y ` @` I}OPMy___PPT10Y+D=' = @B +     X (  X X  ^`0e?Title 1"SMPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!U drs/shapexml.xmlVMo0 t:'A-F-m@Puz.hYnȔ!Y_?JM||$%jͶ:e0#$ S*g ʌ5Ko$qb-kpM#t5xz7IcSZ'0A!+I\l2j R^K6IL/ظ /I|滥b$" a A5]Ƨtvu2: GYE~wj҂aA?e|6NbbmlƋA<6"j!EIM< \Lf#"R0~Ol#<ҡ=^dtB\`! \FAou|*,XsVjE~׳Cˬ%,nB#'q 9ijLմd xClQqdRcވ5b)<"[`F'|>E{ji-^<޿\ЄF(*HfHikU[QJg\UNOMC^x6H!†`ՆM%6҆탦34Ma#Є՝_ pR95rGLK ]k ќ+)1ʦVeI ۏ$:nw+YURv=mp˱W @ R :pmǼxуt;U]Fo@0,\.mjyl$K@k>o¾_ᷓ~J]3 PK!c3Adrs/downrev.xmlDJ1E،26-R)Pl^'o2ːԯ7^,VđB\O ĵזDL;ϤDVV>!+TЦWRƺ%q{5>8L9#u!]'gEq#Z-n9[Y>:ln_c~?9o./ƻ[?~*'@4Cz1QPݲiPK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!U *drs/shapexml.xmlPK-!c3A>drs/downrev.xmlPKB@`}j  F>___PPT9  2Sources of Nondeterminism 2. Input nondeterminism"3 2$$2 X  z Q?,Content Placeholder 2@` ^V___PPT980 User Inputs User can provide different inputs The program can receive network packets with different contents Nondeterministic system calls Calls to gettimeofday(), random() ReadFile can either finish synchronously or asynchronously h c  ^  c]  @` I}OPMy___PPT10Y+D=' = @B +}     \x (  \ \  ^Q0e?Title 1"SMPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!U drs/shapexml.xmlVMo0 t:'A-F-m@Puz.hYnȔ!Y_?JM||$%jͶ:e0#$ S*g ʌ5Ko$qb-kpM#t5xz7IcSZ'0A!+I\l2j R^K6IL/ظ /I|滥b$" a A5]Ƨtvu2: GYE~wj҂aA?e|6NbbmlƋA<6"j!EIM< \Lf#"R0~Ol#<ҡ=^dtB\`! \FAou|*,XsVjE~׳Cˬ%,nB#'q 9ijLմd xClQqdRcވ5b)<"[`F'|>E{ji-^<޿\ЄF(*HfHikU[QJg\UNOMC^x6H!†`ՆM%6҆탦34Ma#Є՝_ pR95rGLK ]k ќ+)1ʦVeI ۏ$:nw+YURv=mp˱W @ R :pmǼxуt;U]Fo@0,\.mjyl$K@k>o¾_ᷓ~J]3 PK!c3Adrs/downrev.xmlDJ1E،26-R)Pl^'o2ːԯ7^,VđB\O ĵזDL;ϤDVV>!+TЦWRƺ%q{5>8L9#u!]'gEq#Z-n9[Y>:ln_c~?9o./ƻ[?~*'@4Cz1QPݲiPK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!U *drs/shapexml.xmlPK-!c3A>drs/downrev.xmlPKB@`}j  F>___PPT9  2Sources of Nondeterminism 2. Input nondeterminism"3 2$$2Q \  z`S?,Content Placeholder 2@` ^V___PPT980 GUser Inputs User can provide different inputs The program can receive network packets with different contents CHESS relies on the user to provide a scenario Nondeterministic system calls Calls to gettimeofday(), random() ReadFile can either finish synchronously or asynchronously CHESS provides wrappers for such system calls      b/]/  G@` I}OPMy___PPT10Y+D=' = @B +>   Y Q `9 (  ` `  ^T0e?Title 1"LFPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!=.Z drs/shapexml.xmlVMo0 tZ'A-F-m@Puz.hYnȔ!Y_?J]`Q&E>>ROvb[il1g.k;g4ʌgϟNԶMیk$b-ǺHJm}i%:pQd4:Invi$K2 l̓^M/ oU|B$  aA5s8]Ƨtvm2hl~~ iA+e{;ڌ)U Px1v#RwNWcF PlDO>@ʺG9C:Ǜ N§ㅛ k%TAS+JY{vqZ/Ɨ:PqÙ^MGր(&l+±-۱q Ņm3:=`l®ݥ2]'*L Hl܄L !/u5uH)eqG9xbobE9#j"y8Hjm [N&U?ʟa[Q/Uڸ}l.rXVlU]D?~$QytIᯬdUIvM/vA84GyoJ8PH aMd]xha>*=OUBcW'='^I,`&<y03mPK!{Tdrs/downrev.xmlDQK0C^ĥlldl/2mMI|9|ol#:8V0g W >޷ !"kl+XnokcDpQAcK,kSW:o1+= n9Ͳh8=Ҧx 7~[V':?gnxziSYw_kSzF0D [2M W?PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!=.Z *drs/shapexml.xmlPK-!{T6drs/downrev.xmlPK;@`}j  F>___PPT9  2Sources of Nondeterminism 3. Memory Model Effects"3 2$$2 `  zU?,Content Placeholder 2@` ^V___PPT980 Hardware relaxations The processor can reorder memory instructions Can potentially introduce new behavior in a concurrent program Compiler relaxations Compiler can reorder memory instructions Can potentially introduce new behavior in a concurrent program (with data races) m   z my  @` I}OPMy___PPT10Y+D=' = @B +     d (  d d  ^ T0e?Title 1"LFPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!=.Z drs/shapexml.xmlVMo0 tZ'A-F-m@Puz.hYnȔ!Y_?J]`Q&E>>ROvb[il1g.k;g4ʌgϟNԶMیk$b-ǺHJm}i%:pQd4:Invi$K2 l̓^M/ oU|B$  aA5s8]Ƨtvm2hl~~ iA+e{;ڌ)U Px1v#RwNWcF PlDO>@ʺG9C:Ǜ N§ㅛ k%TAS+JY{vqZ/Ɨ:PqÙ^MGր(&l+±-۱q Ņm3:=`l®ݥ2]'*L Hl܄L !/u5uH)eqG9xbobE9#j"y8Hjm [N&U?ʟa[Q/Uڸ}l.rXVlU]D?~$QytIᯬdUIvM/vA84GyoJ8PH aMd]xha>*=OUBcW'='^I,`&<y03mPK!{Tdrs/downrev.xmlDQK0C^ĥlldl/2mMI|9|ol#:8V0g W >޷ !"kl+XnokcDpQAcK,kSW:o1+= n9Ͳh8=Ҧx 7~[V':?gnxziSYw_kSzF0D [2M W?PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!=.Z *drs/shapexml.xmlPK-!{T6drs/downrev.xmlPK;@`}j  F>___PPT9  2Sources of Nondeterminism 3. Memory Model Effects"3 2$$2_ d  z@X?,Content Placeholder 2@` ^V___PPT980 +UHardware relaxations The processor can reorder memory instructions Can potentially introduce new behavior in a concurrent program CHESS contains a monitor for detecting such relaxations Compiler relaxations Compiler can reorder memory instructions Can potentially introduce new behavior in a concurrent program (with data races) Future Work     m8z   U@` I}OPMy___PPT10Y+D=' = @B +@  ?? h?(  h h  ^0e?Title 1"GAPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!=%vL drs/shapexml.xmlVMo0 tZ'A-F-m@Puz.hYNȔ!Y_?Ju˺`S&E>>RNf;i23” ]]}yAtliftiM$Nld 4IW[]'NOjLF|Np7K$q[ZʌO8C)Jy-٘'30bz; J ?)oR`%m6NNfɗs@F;( ea)SH Rso]@x:/jDBT֛JyVMFD`Cx3C{9脸.B:AUXROEXsVjEгC۬%,nC#q 9ijLմeFY(821oD܎-.dv0Ovu>ڢvm(^QEtBb|؃ $t3݋xݶͽ(3.6OMC^x6H!@jKM&g[iS͙:Ma#ЄՃ8U'dfi\*Qrit4WJkJ8U~FDUǣOa%J ?.' nz9C<?>xT+N!+p}|1a! *>O]B?{,пZW5X.͸y'q`53j/PK!xMdrs/downrev.xmlDQK0C/'.1&m"vܶ&qp{ۈ#`+f W ^DǤD)u.V"A8䨠ͥ EMеĩ+Se٭h8=Ңce</^fܽMWE"Rǟ˛_z F b$d,A~PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!=%vL *drs/shapexml.xmlPK-!xM0drs/downrev.xmlPK6@`}j  F>___PPT9  ~$Interleaving Nondeterminism: Example"% $$$$6 v ?xLa hC *Group 17"@`  #l v ?xQ h3 $Group 16v ?xQ  h  1dTף?YRectangle 73"P  @> PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!-*K %drs/shapexml.xmlWMo8/uڎ|U&@vA`9)*"r}CʉdmKAgqUcR-Ð3e+כcBYU }j2lCі|c[ AU#*FDAUP6GFhO]NۉZNm<-1lZXվCb7,:Qf<uG # Lb~< $,FGtCHȴ!ܫbP=~ zlkf@qmT^Z? -vRpԹl)LɅqFnkm̛9oǽ?r`cٷshKWQy%bqu534}mhVΝ/>ʄ8r{DэRtRP: 2'm͹;hRMK~= @DK{T^]thUtVb\8N[I1VNd̤ x̣YfƐm7fx85_ggXzJκi<\Y$(fYD4X',ɕO'ݸu\ٽS47JZ٤+ M^/$g 婓p&zSoʴ8JF߫Le4u6[7i\ixxnDc)j.F 7gtE uGA{dVض]ǩX\qkٕY_Fzp0֫4vO/&~dMW"`t@Q:d@/SlG?ěމ*>'ZIR{]Oln}w;Sg]{kSWM0+Bײu\Ba: 6srF YM;/Hi{(4`3{o&#q(8kLgm Jķ0͡J| uRZVS~2~Bz&JOK,GnTY*61*JT(ܼqQ;Ƿ]6IdnoDs[+e/3#]A-uYvpSh.'.?3uã&Aqj2qΌ$gm8uRZUe0 1n`2^ \bUb)0ܚZURTo/LEYqbO94Z9 pwnZ\q-} `i@) ?:#&:ƺ&HgsEphq7oIR0vy83iB;ȏ"4^zV"DmZҍ3.Kvy@+rVnIl+,wE"A]N6H/Wz*#=ſ#}l.swGbLLZߢ[7RzY?c%fv]bH~PK!+qdrs/downrev.xmlDAK@aCiQ*Ŷ>N`v6n߻xo\Fp;3Xjo;i=H,^Vˋ֟d65*C$Ц4ZǺeGq|pm2ΘvInhi৖!Ǐ[M[|/WSy_zya}އn(&-fKPK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!-*K %*drs/shapexml.xmlPK-!+q1drs/downrev.xmlPK3 v !ȟ=7 `void Deposit100(){ EnterCriticalSection(&cs); balance += 100; LeaveCriticalSection(&cs); } aag a R h D 7TextBox 8l`1p/} NF>___PPT9  Deposit Thread&PP    h  #dFף?YRectangle 93"  @Û PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!,4Odrs/shapexml.xml\O8?˯'--V wU}Fn9nvynoA>n2Ǟ/8b3i>t9:3ySg:hgv^'Mn:iDR^al%Nme#*9vO;(5@Wz6ַв2- E 8d dgyրGI:ɼUKs+a[|prNȹci ٠)DR.ER)͛b[4.Z~#o#G1YS4o1Z/ ,y, reX-'-6(z7Qˢ z1C^F?Z_v/M`2nȺؔgzv7HBg ]kS*aoh܅:ǒcQЦ\bXF*|L 2FE]䏱 q*- = ) eXqfiF;aSV1dל]sM· xz{7j^*5!*oG!_1'nHvTvHRYR)r[%5'5@&# c.ϭjc&5o.@qDjDŽ[=x1(h6023. a5zp:Fm'V|0T7WtJwjpJQgew*~mw*0?PK!\Ydrs/downrev.xmlD[K1FC7UڴW t3Y$K> LfmŎBlSp9@+n\`z:w`snAeK\QI˥!q;r*,&>C-u=m+l,-6 v`^nl0O-)7b^|Jw nz) ^`L @NPK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!,4O*drs/shapexml.xmlPK-!\Ydrs/downrev.xmlPK &oE!?xQ void Withdraw100(){ int t; EnterCriticalSection(&cs); t = balance; LeaveCriticalSection(&cs); EnterCriticalSection(&cs); balance = t - 100; LeaveCriticalSection(&cs); } g    h F TextBox 10"e_PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!Q!@drs/shapexml.xmlTO0~iZhDc-ϓ8%cGSZ}g0M2iyH.;֊muc8:7EWc~9:y c_L>~8o20\.k&K?ZcH ]il-<~*itR{VI&4̛%), rE WfO:2g~SSP'/Ud]o-x)K MO8!h4DDYN)ᐳh0A3!:Ewgј[{ )2:CCб67R Am2ؑ%GdÛfVJ=M{tl|iq%˽wvoe`imuΟsV/"wq /n6?)*sXQ@/=#h伭$̃ZZwXCPipisI~ Kᤪh\5 rQYǩN#e܀U4DڗPELφvA[ mO.y a~ am;-eɁIY%~BRDE^)rq AR3az/*o;yhQh[aCtPK!X$tdrs/downrev.xmlDj@2&J% 오fwӝƷ҃=|hzq!ϝ Iltg%YRp#avW>4"J,稠 aȥ%___PPT9  Withdraw Thread&UU ;  h  @^ɵd}`ף?ɵYRectangle 53" @êPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!ĀB drs/shapexml.xmlVMO1W|&PbPx!wT!Bx>bSk+k LaKe9r5[& M!4yy5﶑*jtqK ZgǽYV2|zLIn=qL?@.R` -):RAu6|ru"%#Wt۪bggۂNO{= r Ly4cZ T8B!CPA[ 'dae2<I|w#LbktA,)im>;kYU!g1skVƺײ/W*^ʖ[ g-FʀK .K>̨>$2tר]46V0^)dS.zTsV'l:fU$ܚ+gemil;+Kl}ؔ&h>6FPLi=9׸J!N U|E;MuΞLyq"91M:bI\ZJbaGܠ MNpF;g+hF 8:FDX5h$ԊBmY[ET.`]_k-"inkP7UIqAp/w%3ˁm#+mGj1&eÈWHB/&6dG0cԣr :IDO%B9ƈtB>-(fPK!ydrs/downrev.xmlDKk1p L_RF`[F\8^'wur3$Qg\9|o:M+|cY(A\Xpkzx2)|v{3T o震JD!tɠَ8vuC%M+d, 6jhYSqOFkfajfD>}+O` [􁜂M%/PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!ĀB *drs/shapexml.xmlPK-!ydrs/downrev.xmlPK 2P yinit: balance = 100; g  I  h   ɵd}`ף?ɵYRectangle 63" @ïPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!UG drs/shapexml.xmlVMO0um"Mzؑ픖_3vJҲ#94x<fz~4[J59v9FB?_q52k:5gu!Y\Vm- Up:^Us:(Gh,đ$nTS TN IK6VԣlPή mA*]Ն pyd,*Gp:'ۥx )1/j NΒB'EB᧴{GP"A ;'hxae2|'xoAbȱvl : JŔAoTZ;nkY9G֯c|JʾXZ/: +[) zl2`ܺS*}Dn:ՇkƮ*p71^)e ,ٔ~^9+dyK·~:fU$ܘ+ge<Mi쑦#s}ؕ&h>6ZPLiz]z^9ոJ!F mw/˰^;k묙טET 0K 2D.5%rq]4o Ōs.׋"ZIɹA4Z0v%$Kp6Ʊ+ExM6؉r\6_}ZFhCQ{hӠ"nV>MmC2j%ojnL `CfZ9 Z 0αmgj*1>&1eÈ?*s !K Ѭ,a4D_C8x9ħpȺK$śGPK!;|`;q$Z G35vIgWS̵;UlDpQϥ !az흷SO n;ei`WCwu "֋qYn[dno HCWz(?/j<ؿw L%/PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!UG *drs/shapexml.xmlPK-!___PPT9  )Invoke the Scheduler at Preemption Points"* ))& v ;?xx` lC *Group 16"@`   l  \dTף?YRectangle 43"  @ã PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!ަ >6drs/shapexml.xmlYMo8/uN"M 0eH];~IE{H%lJq8o>5qYJZKP\gʘJt%,xV+T):W%SQ2NWBa.צdfҩB9栨n}d7XJ-FX )^RX c)Hvj/ tvװa-,sS[d̰`w,yN)}uy>/C3K !ѻ^vD'ċVƺB+J2%lqoaߖX#Pxܭ ? 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8drs/downrev.xmlD 0VfSEişXڵ-6Ķ$eenDG +G15 l yäCtu#qk Z:T?o`K :gvi_<)5 -Ow?\~PK-![Content_Types].xmlPK-!Z,[ _rels/.relsPK-! 8drs/downrev.xmlPKi     c $IS"PK![Content_Types].xml|N0 HC+jS8 @:Q۸ ??\o<7p]V޷O(I'6E=, ){Ō4>I)q7UuDހǏ)}nL"Mᴸ&g0eSA)΄2';2 WYu7{ɯΒzŘqFrj9K*(]mOlPK!Z,[ _rels/.relslj0 ``t_Pƈ[>,dgzjǎ?I'f#®Pb-\/Ƿ0Z]nLnp__3.iJV KQBiDžrL,Vʌ/7р4`ANar+m;E/'3U Aںv83/PK!Hdrs/downrev.xmlDj@E0RZl9.4[C*XT.˩ƯFٸ{h zDPK-![Content_Types].xmlPK-!Z,[ _rels/.relsPK-!Hdrs/downrev.xmlPK  NF>___PPT9  Fair Demonic Scheduler(   I}OPM  ___PPT10 +vD~ ' = @B D9 ' = @BA?%,( < +O%,( < +Dp ' =%(D ' =%(D' =ABBB@B0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =ABBB@B0B%(D' =1:Bvisible*o3>+B#style.visibility<* 9%(D' =ABBB@B0B%(D' =1:Bvisible*o3>+B#style.visibility<*:M%(D' =ABBB@B0B%(D' =1:Bvisible*o3>+B#style.visibility<*M\%(D)' =4B BB@B%(D' =-g6B fade*<3<* D' =1:Bhidden*o3>+B#style.visibility<* %(D+' =4B BB@B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =-g6B fade*<3<* +8+0+ +[  vnV(  .   ^0e?Title 1@`}^  :2___PPT9  :     z ?,Content Placeholder 2@`j F>___PPT9  L What notion of  fairness do we use?,' $  & @` I}OPMy___PPT10Y+D=' = @B +3  222(     ^JS0e?Title 1@`}   O Weak fairness  -   z`LS?,Content Placeholder 2" PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!\g,drs/shapexml.xmlZn6;YۊFE X,z hUSJҮc_WGJOzcH4p\06*wmJ:cL?ߝ(IDLWW?tY lA0YAөsŠղ|*rfB(̡k[V(6e+j[9Rj1.FƷȐ,)%V+d$S-aHD[t93[A)1/й QW:~VFM3i1%)ΙqP i7wQXBc m4F'K6 zK>~=B KcR/1U*Ølt%3a?3dX0k8ٓ-t' ypGF4̸Uh  y[)oWb$(}I ATZf1tv56HS]ͨP/~mKD˂=ʙR<ǣmhB'cy&0"x@+CMjmk6/ Ud =qކm7H^ƨF~llo3.I>aJv &5}sZ }s_}G[uAfSuy@~Wr&fcr{@7lj#TAn0 kr4"8EŊlR α3.Iv>`3KDX,Lac_^Ü{g̳u*|\%;ق};iQhIe{V%6iAH Z0>?̦GO9zU`%|2"@m1犳JPnr)ϧǸGfZ{[wx58ipK= 4Tp _D!{M4D,e=b؛H CM*FyeR rC:pBTP"deHg e3&h?㪃rm]OM& QC}6DHÜK|pfɏ٭w9jvS97a^3L@wv"DFyCXAb 8h]yw 3ۺ@N\ԏR4 Z5_ o޳0*m/Qp@A `¿kq\TWUBBL{ t+C̈́LbUr_6_=9<~.swcPK!1drs/downrev.xmlDN0EH5HC VPȊ 0ē6MX,`yuYm&۫#9AeX*g:i%I N6ƍ!6*A$8ZeKa[)FOc^ϳl-uZxru۰x,Ͳؽͨo~xy1=܃<.iW p~=})D-&KPK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!\g,*drs/shapexml.xmlPK-!1drs/downrev.xmlPK @`j F>___PPT9  BForall t :: GF ( enabled(t) scheduled(t) ) A thread that remains enabled should eventually be scheduled A weakly-fair scheduler will eventually schedule Thread 2 Example: round-robinrl   O >O@` "   QSdTף?(YRounded Rectangle 33" @PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK! 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D>_z ʧ+Hn4Y\PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!)=5*drs/shapexml.xmlPK-!xdrs/downrev.xmlPK!@`}j  F>___PPT9  +Robustness of the Good Samaritan assumption", +$$+   z`R?,Content Placeholder 2@` ^V___PPT980 A violation of the Good Samaritan assumption is a performance error Programs are parsimonious in the use of yields A Sleep() almost always indicates a lack of progress Implies that the thread is stuck in a state-space cycle`G  / m I/l  @` "   RdTף?(YRounded Rectangle 33" @PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!֫kdrs/shapexml.xmlXQo0~G?X~EEd! &T]g uvJ_wv˜bhK|ٟɫֈqc)UjE)?J"يǏ^uE:Pt+F.uKE[|Kby5Ũc eWnRVS/RXjrz[J̴D.hnɶcX!Iź0UV`fIk.` 6l=(&1Sa·N{OK@ 4Y 6?6 d31:<@&o=gRƋRRȜXaƘ C<`?X_XMĴrg.xXZ}p^:Kv+U }t*'s#'r^o'("Zga̒aVHRfoMg/9&u>:) dr ك M{0|c9NMUL@vn[L!&ٶMǼoh]:W7)qs"DZd=h̲N',9Oۦu )V\Jm>QބUV,Z٥/E.OYNX7OK@ ipTޒitM MsuG(8XuP̊$8T0o+\[}畹|IfzfStM S{=:C4n500su"/3Ḣ׎vL;d6Lbǎ$ :#?.!wrh*߫^Ql5%O8nNVhg0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!% drs/shapexml.xmlVMO1W|h> (X 8W+ۛ&7""¡6x>g|]kRW|ϙ2Y`̙B[rQ}tda8l|!&|P_m Jj)LjǽZTY͚#Iޮ&UEGQԶP*@Z#tX A=MKWwZ8 Rd,:G'~@mr>!õ:0 hx$4ƇcJ  i6·o#C9w0E&V7>$[?;$|**K @"u[ s!% gA ۲GUYswc|2ֽ}t_֛,/mpE[r.K}Qk9斫])aBbKt#D`SY;1=dpR̅čtKyF_# 3 46S;Z7%3ˁMJ!萚DJ _lHߵI+pqx-hA!'Wq&_7gPK!tdrs/downrev.xmlDN0DHHܨn+ Z(p\vkqhFovb!!\N Z^[1Sy\̩T~p+ޯbI&26-ʼnn냥cR2v(R򃡞 7Eyq=}_OYkD1lE=+kۧWhՊb‐ݲi8PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!% *drs/shapexml.xmlPK-!t}drs/downrev.xmlPK 0 0 NF>___PPT9   done = 1;*    C ,A TextBox 5#"tPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!\drs/shapexml.xmlTN0}:AT"Ppؖ픖߱Ĥi>׹^{o ;nldN%\Vn:OKJcfBIf˵ά&H698$Նw̞+%|2sؚu \:Px4%k%(+xz- i(C߻;'4"|0q{|DD۳l8etCZ {u24'x)9t|NgQeTQ:)%"&d؉ƺ\}+ʩ,cuԱ,}+g!FPuxȅL $XbmpXė g ';Rm<;f9)`<CDoe 5LPRf%Wtd\l!4Jې%#7R6LAe/+Ԅ,t{ZVMG7Pmoc_G-¬ֲ/^N=q<}Cce*ˀcހ/-\}vw!ōsSUzǮ8(2!U,Jx [FpӐ)X ےY.Z/y (n\0J1HD8?F'L_àB哟>bk&di0G}BAU÷N 7{,:*Qف4x ߬6^ p`AzzPK! ndrs/downrev.xmltN0EH5HZ5Mԭ*UE[,]g$$NMτ"un|ޙ;ٱ*k@t#`hMvm mڢzM&z:X? 1dXi߭U:Pv;bUl<JåW(ϧ˓C(Liơ=>)LS%~OGDBBoax$e\@mRAr7PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!\*drs/shapexml.xmlPK-! ndrs/downrev.xmlPKiF   C ,A TextBox 6#"tPK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!rd\drs/shapexml.xmlTn0}:!25T$TB?Iplv(wl:iZuۻ}+Ȏ(r@ jv1:&+&9=pK_jdi3Ӎs:K[nx\W+2Y'p˥cZ qҲF)^o!MH֢݃ړ1MLr*wr~ gl_oOa/.Yꚠu:Iu:6J }ҷ4HG4Dh|3 }@;XOwEA95tel7.:🥚5B|oUgO/\00Ie*Vw}׉E|9aldG mߑgc< ``2Ɛ J*^X|Mzud\l.J%#{7R6LAE'KԄ\du(1yc߼G\-¬֢[q<}CcE*ˀSހ/-\]۴w!ōs҉Ǯ8)2!2XldFpӐ)X ۂY./yja]5a=%ʏXؘu$"- Z ߩ^>)탸!,2Sט#x\vT!yJ[+/esp}(mOoMWYE^ p`AzzPK! 2 drs/downrev.xmltAO@&͘xm),۲҆.PS5!Ƹoޛy36dC0[/Ҥ 8b,Giu4+___PPT9  lFair demonic scheduler E   zR?,Content Placeholder 2@` ___PPT9x Maintain a priority-order (a partial-order) on threads t < u : t will not be scheduled when u is enabled Threads get a lower priority only when they yield Scheduler is fully demonic on yield-free paths When t yields, add t < u if Thread u was continuously enabled since last yield of t, or Thread u was disabled by t since the last yield of t A thread loses its priority once it executes Remove all edges t < u when u executes7 4  2 K r  - ' 742  Kr-&  $$ I}OPMy___PPT10Y+D=' = @B +Z   u m 0U (     ^R0e?Title 1"2,PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!)-drs/shapexml.xmlTKo0 t:'A-F-m@PuzhYNȔ!Y_?Ji.[ؔl/S3>O1@56 x:ZHzpzS)*>و~)ks$ 0.2!jPN:4SQ֜ZA?쐛^]hu*Ù^M.[ ʲEAǑIy#&׈lvx|iq-?k*?y|akF!ZIwtCb|8 5$L3݃xݵͣ(3.!OMC]x6H)BjGC&g;i[͙Ma#gBI*2GTQ.(h c:[5Ft_Ѫ #aH&U%j؆0!^ T?iA*BBB>s^?H8Oס6 zFI,`/+}WifPK!drs/downrev.xmlDQK0C/LF]6d2Et |mn`sSvp[ۊ#`+3ĥӆkoD[ǤDVˋ."A8䨠˥ eCuĩSf٭h8=4Ѻsm3en p",&/I+O7z!Wܒi<PK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!)-*drs/shapexml.xmlPK-!drs/downrev.xmlPK!@`}j  F>___PPT9  }#Four outcomes of the semi-algorithm"$ #$$#^   zR?,Content Placeholder 2@`  Terminates without finding any errors Terminates with a safety violation Diverges with an infinite execution that violates the GS assumption (a performance error) that is strongly-fair (a livelock) In practice: detect infinite executions by a very long executionBn Y B nYB @` I}OPMy___PPT10Y+D=' = @B +  @(     ^R0e ?Title 3 `Sj F>___PPT9  Data Races & Memory Model Races(   I}OPMy___PPT10Y+D=' = @B +  P(  j   ^R0e?Title 1 Cj  F>___PPT9  jWhat is a Data Race?    zR?,Content Placeholder 2PP  FRIf two conflicting memory accesses happen concurrently, we have a data race. Two memory accesses conflict if They target the same location They are not both reads They are not both synchronization operations Best practice: write  correctly synchronized programs that do not contain data races. n c X      cY *@` I}OPMy___PPT10Y+D=' = @B +  6.`(  x   ^`R0e?Title 1Ppj  F>___PPT9  x"What Makes Data Races significant?# ""^   zR?,Content Placeholder 2PP  Data races may reveal synchronization errors Most typically, programmer forgot to take a lock, use an interlocked operation, or declare a variable volatile. Racy programs risk obscure failures caused by memory model relaxations in the hardware and the compiler But: many programmers tolerate  benign races Race-free programs are easier to verify if program is race-free, it is enough to consider schedules that preempt on synchronizations only CHESS heavily relies on this reduction|-   (  -,( @` I}OPMy___PPT10Y+D=' = @B +O  jbpJ(  k   ^ R0e?Title 1@`}j  F>___PPT9  kHow do we find races?    z@R?,Content Placeholder 2  Remember: races are concurrent conflicting accesses. But what does concurrent actually mean? Two general approaches to do race-detection. 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}P8N9Gӵ24m{9j*6s8(t"wά@i9J˯.~21Z6rt˒ĊlN"jmZpjIgQht p]t3-qT9? %ʹBIvēFÆ ԦBXEy2]ldDls~tt261C&7 OFgggt@$1uߥpTosCʐ~zjaO4JPVIT8L(ۻ5Pi`ʰ5TP'%yںQӈ'___PPT9  tHow to Find Store Buffer Bugs?    z`Lv?,Content Placeholder 2P ^V___PPT980 UQNave: simulate machine Too many schedules. Better: build a borderline monitor [CAV 2008]. Idea: While exploring schedules under CHESS, check for stale loads. A stale load is a load that may return a value under TSO that it could never return under SC. [Thm.] A program is TSO-safe if and only if all executions are free of stale loads.  t  D    Q@` I}OPMy___PPT10Y+D=' = @B +  P (   {    ^}x0e?Title 1@`j  F>___PPT9  {Demos: Dekker / PFX.       z|x?,Content Placeholder 2"P J PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!Zdrs/shapexml.xmlXn6} ZDZ(E ۃQq=4EŚ)R#)~b_!)v0 kkf=PxI{%J0*w}J:/cJ?ߞ)IDJo~&NҹzYt- m*h{V(&d/G^b(י5aR)=D ShГdq2$Zǎ hfl Haah?,h'<4d~zISJmqPݤtLy29k;Fk[ kdMayy(&%[;#Q2d"͵ηwx"zDh9B'8M"q(j^;7y,{Hn+" tER13Kir> gTextBox 2" ý PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!!gYdrs/shapexml.xml]s6L^;9%Mڇ4e02eW dz&![j?~])?cfdQ{]3dI},BJ˟v:=>6ZY0%,LL,,4Vjd&Unbi~ U0 fâqpE M˹N[E ,nB] z]St硉ձ0^n [<==B- дB?Y.NNa|P}sq~%Z+X45U&{waE=nd`+fM-:GJKO_Oմ/|Äxfؙ\ə&Q=vҫ m١](on Gț0u.̍Ez Rn 5Sex/FçBƁ"Rk\D+Rp@t^ =:Ք)KA`L@cK\pYfcl(?? +e玬|0V?@"V<.P㳗eGKl 4>q'F0tP i7r}54*DKt2tW=H )2^Q0 UoHdRE Lz Rw()RϲJc QTHmN!K0_(sv"7In"i؝|,l08R LSa2_W^ڃm1Ð < b^1(O4eٜ:N-lI O龢 *JQARy{2*tpSi S)mFMkYASo½@Ȅ{ *i5d l _y ~1rPp:OVFCᯈI,脄>^B%0.+3F+e9&S!y#y2)oYhw7V~6)S  %CBثw!B(&ZD=eSJ~?H^Lf?nβ쒋\lb;mcѿ hj j0F5֕vw[dM֙3YC[gPeP-n1r5 eŚ)YS-vqALF$6d/^<ܔ˿WQk0+BsLi[G94(^Y ºCڔv RHJ(W7k\HAc^XaUaV#$J;ɻe N(+((ޅn@˞3#\]B-$<}؂mX'_ju)L7>6>^7cocg…|m7dZI6)GucM=R'NI bG'Vz$vh O0\`{x5{+۷[x,ߗ,P7OjH9DQ`'hjtFGSJ BmjQj*N^]FMK߉ܨ U @nGKJ^!_SS߲Vjnw]+SӜմeK|Ad*}Bjm@ 1l<_OsNlOft7O7bk(']?%sL7S6^2K?GPCi]+A;y<.Te O0qcCMs]ؘ/PK!>hdrs/downrev.xmlDJ1!MjڴiMp3Yn^;|;q\` A\p|_=H`4\(b~}5ʄ3tȭ(Nj91BO\&DJ\ྒྷJ=H˃Ş^,՟okvm7)RKoo'?qVWFD|Dg2E ŭKPK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!!gY*drs/shapexml.xmlPK-!>h drs/downrev.xmlPK NF>___PPT9  Yvolatile bool isIdling; volatile bool hasWork; //Consumer thread void BlockOnIdle(){ lock (condVariable){ isIdling = true; if (!hasWork) Monitor.Wait(condVariable); isIdling = false; } } //Producer thread void NotifyPotentialWork(){ hasWork = true; if (isIdling) lock (condVariable) { Monitor.Pulse(condVariable); } }Xcgw<cgU cg;cgw< cgUZcg%cgU cgw___PPT9  tStore Buffer Bugs - Experience  (  zn?,Content Placeholder 2" × PK!Zf[Content_Types].xmlMO &2WR=cJ`F0iK`#̼vLw 9uSq:w`G ^i ½KI)c/ $oVjTMRc|}042ҥCƔM̏P~*ka/8^DkHbL8e i"K\XN\6rco4y@_;oPK!1_a _rels/.relsj0 ѽqCNo^K [ILcX&m߾0XFo;>0xM e`|X}đ I`߽N4aG2$RKIZ)4(M9`ctB{m:f@`3n|O,ܗr޾jxR0T ,0@}WBLǬ5vPK!2e3 drs/shapexml.xmlWn6?2v'v($@څQq]4EŪ)R%)β?/ tffـMK{I]|֒lV9=~?D(J=ф*Jt',p6Nk+Q3^7BVjS3y4FXsl8<ԬRC͢lTENO(QƔ7Z9Dd\,!$Ȁf&HS u>CC`A~AAS@'mV>' mNGlkal-MZl˒`hzM&h;#xQceFhmuK#1_N'J!<"lPWeT߉&~O`GHn'kJxD"4N20]Nѐ+Ubszy0JJ Q޳ӥ͸#L]/=RBYQɌiVL=p80lܑ ðҎCkQvFIҽP*5H7pJ [)5jK24؂'zSyk3O^tz;{}I^xo2^yK/^j'T1g޿ϼR{ҿE{a}~QyQN/Eϯrxk-Vn0 ~Aסs]9MZ/2eHr丗cF8 ݷ1`?GW_ӛє`~4aw0خUhgs,ˬ{I$_M fU7nU6n!HaX ft9dW1g V]ί&ۛ9@1犳J/P.94N8CO |0۰蝦LnnהYѣCV N±Wų9AوqR&cyK޲TD3<&1&A4qeܺ-_T܃h^H^ArKPK-!Zf[Content_Types].xmlPK-!1_a /_rels/.relsPK-!2e3 *drs/shapexml.xmlPK-!YKdrs/downrev.xmlPK @` ^V___PPT980 HRelatively rare& found only 3 so far We expect to find more as we cover more code& detection is on by default whenever race detection is on Found 1 false positive so far (i.e.  benign stale load). 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" # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~                            ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~                            ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~                            ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s u v w x y z { ~  | Root EntrydO)4Jӥ PicturesoCurrent User SummaryInformation(t PowerPoint Document(DvDocumentSummaryInformation8 MsoDataStore GӥGӥGDIDS3FEK0M==2GӥGӥItem  } Properties1KJJUIB0ZQ==2 GӥGӥItem  PropertiesTOZUU4545JA==2GӥGӥItem IPropertiesKkeywords" minOccurs="0" maxOccurs="1" type="xsd:string"/> This value indicates the number of saves or revisions. The application is responsible for updating this value after each revision. d:all> This value indicates the number of saves or revisions. The application is responsible for updating this value after each revision.   !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHJLMN DocumentLibraryFormDocumentLibraryFormDocumentLibraryForm ՜.+,D՜.+,     $ U On-screen Show (4:3)Microsoft Research_W eCalibriArial Wingdings 2 Courier New WingdingsSymbol ConsolasTimes New RomanEquity 1_Equity 2_Equity 3_Equity 4_Equity 5_Equity5CHESS: Analysis and Testing of Concurrent Programs%What you will learn in this tutorialConcurrent Programming is HARDCHESS in a nutshell CHESS DemoCHESS ArchitectureThe Design Space for CHESS1Comparison with other approaches to verificationErrors that CHESS can findCHESS Scheduler+Concurrent Executions are Nondeterministic"High level goals of the scheduler8Sources of Nondeterminism 1. Scheduling Nondeterminism8Sources of Nondeterminism 1. Scheduling Nondeterminism3Sources of Nondeterminism 2. Input nondeterminism3Sources of Nondeterminism 2. Input nondeterminism3Sources of Nondeterminism 3. Memory Model Effects3Sources of Nondeterminism 3. Memory Model Effects%Interleaving Nondeterminism: Example*Invoke the Scheduler at Preemption Points=Introduce Predictable Delays with Additional Synchronization6Blindly Inserting Synchronization Can Cause DeadlocksCHESS Scheduler BasicsCHESS Synchronization WrappersCHESS AlgorithmsState space explosionPreemption boundingPolynomial state space"Advantages of preemption bounding&Finding and reproducing CCR Heisenbug%George Chrysanthakopoulos Challenge-Concurrent programs have cyclic state spaces3A demonic scheduler unrolls any cycle ad-infinitumDepth bounding'Problem 1: Ineffective state coverage !Problem 2: Cannot find livelocks Key ideaWe need a fair scheduler Slide 39Weak fairnessWeak fairness does not sufficeStrong Fairness'Implementing a strongly-fair schedulerWe also need to be demonic*(Good) Programs indicate lack of progress,Robustness of the Good Samaritan assumptionFair demonic scheduler$Four outcomes of the semi-algorithm Data Races & Memory Model RacesWhat is a Data Race?#What Makes Data Races significant?How do we find races?Synchronization = Locks ??? Happens-Before Order [Lamport]!Happens-Before for Shared MemoryExampleBasic Algorithm!Reduction for Race-Free Programs#Preemption / Instrumentation LevelDemos: SimpleBank / CCR%Bugs Caused By Relaxed Memory Models$Example: Store Buffers Break DekkerMemory Access TerminologyStore BuffersHow to Find Store Buffer Bugs?Demos: Dekker / PFX Slide 67Store Buffer Bugs - ExperienceWriting a CHESS MonitorSpecifications? More Monitors Find More Bugs%Monitors Benefit from InfrastructureChess <-> Monitor interfaceAbstractions Provided%ConcurrencyExplorer View of Schedule Event IDsSyncVar SyncVarOpSome CallbacksHappens-before informationReduction-Compatible MonitorsRefinement CheckingConcurrent Data TypesCorrectness Criteria7Observation Enumeration Method [CheckFence, PLDI07]Demo Conclusion  Fonts UsedTheme Slide TitlesW0PublishingExpirationDatePublishingStartDate 2019-06-16T10:13:53Z2000-01-01T00:00:0