UM0-401
OMG
OMG OCRES-Intermediate Exam
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Question:1
Anexampleofamodule exhibiting temporalcohesionisacombinationof------
A. thecontrolandmanagementoftwoonboardhardwareclocks
B.a40millisecondperiodicnavigationfunctionanda40millisecondperiodic displayupdate function
C. severalmathematicalfunctionssuchasthesine,cosine,and arctangent functions
D. the vehiclespeed and accelerationmanagement functions
Answer:B
Question:2
Whattwo actionsmust occurinsystemsthat useoverlaying withadiskdrive backingstore?(Choosetwo.)
A. OnlydataisstoredonthediskandcodeisstoredinRAM.
B. Atask executingin RAMcanalsoexecutecodethatis storedonthedisk.
C.TheoperatingsystemmustpreventeachtaskinRAMfromaccessingRAM
outsidetheareareservedforit.
D.ThecodeforthecurrentlyexecutingtasksisstoredinRAMandthatforthe currentlyinactivetasksisstoredonthedisk,asmanagedbytheoperatingsystem.
Answer:C, D
Question:3
Whichtwostatements about staticmemoryallocation aretrue?(Choosetwo.)
A. Garbagecollectionis notrequired.
B. Memoryfragmentationdoes notoccur.
C. Memoryallocation units are always the samefixed size.
D.Tasksmustinformtherun-time(e.g.,operatingsystem)thetotalamountof memorytheywill needbeforetheybeginrequestingmemory.
Answer: A,B
Question:4
POSIX------
A. is thesameasUNIX
B. isnotdesignedforreal-timesystems
C. doesnotsupport asynchronousI/O
D. isanoperatingsysteminterfacestandard
Answer:D
Question:5
Aschedulerrunstaskstocompletioninsteadofpre-emptingtasksby timeslicingor accordingtopriority. What twoactions willoccur?(Choosetwo.)
A. Maximizethenumberof completedtasksperunitoftime
B. Minimize thetaskschedulingand contextswitchingoverheads
C. Honor thecommitmentmade tocompletethetaskonceithasbegun executing
D. Sharetheprocessortimefairlyamongreadytasks
Answer:B,C
Question:6
Whichtwostatementsaretrueofamonitorforsynchronization?(Choosetwo.)
A. Noconcurrentaccessbytasksisallowed toanyresource(s)withinamonitor.
B.Onemonitormayencapsulateanynumberofresourcesandtheirsynchronization functions.
C. Ifarequestingtaskentersamonitorbutfinds the resourceisn'tavailable, thetask exitsthemonitor and isplacedattheendofthemonitor'sexternalqueue.
D.Iftwotasksarewaitinginamonitor'squeuesforseparateresources,whenthe taskthathasbeenaccessingaresourcefinishesdoingso,all thequeueswithwaiting
tasks areservedround-robin.
Answer: A,B
Question:7
Whichtwoare POSIXreal-timeextensions?(Choosetwo.)
A. suspend/resumeAPI's
B. directcyclicexecutivesupport
C. tasksynchronization
D. priority-based preemptivetaskscheduling
Answer:C, D
Question:8
Which two of these techniques would successfully avoid mutual exclusion
deadlocks?(Choosetwo.)
A. Setupacirculardependencyoftasksandresources
B. Allowatask'suseofaresourcetobepre-empted
C. Require taskstoacquire and useonlyoneresourceatatime
D. Require tasks toacquire resourcesinorderofthe tasks'priorities
Answer:B,C
Question:9
Thepriorityofarunnabletaskblockedonaresourcerequestis temporarilychanged tobethesameasthepriority ofanothertask. Whichtwophrasescoulddescribethe newpriority?(Choosetwo.)
A. Thepriorityofthehighestprioritytask
B. Thepriorityofthelowest prioritytaskwhichusestheresource
C. Thepriorityofthehigherprioritytaskbeingblockedbythelowerpriorityone
D. Theceilingpriorityoftheresourceonwhichthelowerprioritytaskisblocked
Answer:C, D
Question:10
Whattworesultsoccurbychangingprioritiesdynamically?(Choosetwo.)
A. Reducesoverhead
B. Increasesoverhead
C. Maystarvelowerprioritytasks
D. Avoidstheneedforpriorityqueues
Answer:B,C
Question:11
Arepresentativebenchmarkdiffersfromasyntheticbenchmarkinthata------
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