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Each process utilizes a resource as follows: request use release &U &9 >9N) Resource-Allocation GraphXV - two types: P, processes P = {P1, P2, & , Pn} R, resource types R = {R1, R2, & , Rm} Request edge  directed edge P1 Rj Assignment edge  directed edge Rj Pi  #*(Deadlock CharacterizationKMutual exclusion: only one process at a time can use a resource. Hold and wait: process holding resources can request additional No preemption: previously granted resources cannot forcibly be taken away Circular wait: must be a circular chain of 2 or more processes each is waiting for resource held by next member of the chain0n" n+"Deadlocks and Cycles/&Methods for Handling DeadlocksPrevention  by structurally negating one of the conditions Avoidance  by careful resource allocation Detection and recovery  let the deadlock occur, detect it and then take action Ignore it altogether - the Ostrich approach Reasonable if deadlocks occur very rarely cost of prevention is high UNIX and Windows takes this approach It is a trade off between convenience correctness 8@8@ ib.Deadlock Prevention  1AAttacking the Mutual Exclusion Condition Some devices (printer) can be spooled only the printer daemon uses printer resource thus deadlock for printer eliminated But not all devices can be spooled Principle: avoid assigning resource when not absolutely necessary as few processes as possible actually claim the resource x)&S.p)&S. png.Deadlock Prevention  2@Attacking Hold and Wait Require processes to request resources before starting a process never has to wait for what it needs Problems may not know required resources at start of run also ties up resources other processes could be using Variation: process must give up all resources then request all immediately needed 7. f G7- f Gkd.Deadlock Prevention  3Attacking the No Preemption Condition This is not a viable option Consider a process given the printer halfway through its job now forcibly take away printer !!??<&A<&A<mf.Deadlock Prevention  4Attacking the Circular Wait Condition Impose total order on resources If all processes follow order, no circular wait occurs Advantage Simple Disadvantage Arbitrary orderingd&b &b 2)Deadlock Avoidance Knowing what processes will request we could schedule carefully to avoid deadlocks Each process must declare maximum # of resources Examine each request and ensure circular-wait will not hold Not commonly used too much knowledge processes are created dynamically &66@7Deadlock DetectionAllow system to enter deadlock state Detection algorithm Check Every time a request cannot be granted Every now and then or when CPU utilization drops Look at dependencies to detect deadlock Recovery scheme Inform operator Recover automatically Terminating one or more processes All deadlocked processes or one at a time until broken? Which one? Preempting resources from deadlocked processes Checkpoint and rollback, which one? Careful with starvation! 9X(&"C/>9X( &"C/>  ` .T3f` T3f3f` 999MMM` lff3f3޲` eoHff33Ҷ` ff!>?" dd@ ?nPd@ d " @ ` n?" dd@   @@``PR   @ ` `$p>>      (    Nff??"?  Nff??"?  Nff??"?  s *5 "0@  T Click to edit Master title style! !  c $ "0  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  Nff??"p   Nff??"p   Nff??"p   c $ "Ss  P*&0(2 2  # l 1?"  Fabin E. Bustamante - Fall 2002L!0(2 '    # l?  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JP0 @` u Nd?"P0   KMax @` v NN?"0 P  KHas @` w Np4?"0   R  @`B x N 1 ?"0 0 B y N 1 ?",,B z N 1 ?"0 ,B { N 1 ?"0 ,B | H 1 ?"0 ,B } H 1 ?"P0 P,B ~ H 1 ?"  B  H 1 ?"  B  H 1 ?"mm  H$B?"P@ +  h,Total 10 Allocated 7 Free 3 Safe: P1, P2, P0 -0 2-  HE?"P  v:Total 10 Allocated 8 Free 2 Unsafe: P1 4 free and need 5! ;0 2;H  0޽h ? ̙33  $(  r  S ,q0@  q r  S Ԑq0 q H  0޽h ? ̙33rt@XR:mHY]%|_( 2dha+f/j2u@Uilkgpm son)AnOh+'0R hp   ( 4@H#Classical Synchronization ProblemsiFabian E. Bustamantetio nwu-2002 BuFabian E. Bustamantetio29iMicrosoft PowerPointtio@3@PxaE@kC\u GPg  R('& &&#TNPP2OMi & TNPP &&TNPP     'A x(xKʦ """)))UUUMMMBBB999|PP3f3333f333ff3fffff3f3f̙f3333f3333333333f3333333f3f33ff3f3f3f3333f3333333f3̙33333f333ff3ffffff3f33f3ff3f3f3ffff3fffffffff3fffffff3f̙ffff3ff333f3ff33fff33f3ff̙3f3f3333f333ff3fffff̙̙3̙f̙̙̙3f̙3f3f3333f333ff3fffff3f3f̙3ffffffffff!___wwweeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee--&TNPP &՜.+,00    On-screen ShowNorthwestern University_  ArialTahomaTimes New Roman WingdingsVerdanaSymbol Helvetica nwu-2002 DeadlockThe Deadlock ProblemResource-Allocation GraphDeadlock CharacterizationDeadlocks and CyclesMethods for Handling DeadlocksDeadlock Prevention 1Deadlock Prevention 2Deadlock Prevention 3Deadlock Prevention 4Deadlock AvoidanceDeadlock Detection  Fonts UsedDesign Template Slide Titles ,_㽜qFabian E. BustamanteFabian E. 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