Lecture 8 Java SE – Advanced Multithreading
You should assign null to a Thread variable to indicate that it is stopped rather than use the stop() method. Page 13. 1. Threads Concurrency – Synchronization.
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JAVA - MULTITHREADING. Java is amulti threaded programming language which means we can develop multi threaded program using Java. A multi threaded program
Multithreaded Programming Guide
Oracle and Java are registered trademarks of Oracle and/or its affiliates. The concept of multithreaded programming goes back to at least the 1960s.
MultithreadedProgrammingGuide
BetaPartNo:E35303
October2012
applicable:121010@25097
Contents
1 CoveringMultithreadingBasics........................................................................................................17
MultithreadingTerms......................................................................................................................... 17
OracleSolarisMultithreadingLibrariesandStandards ................................................................. 19
Bene?tingFromMultithreading ....................................................................................................... 20
ImprovingApplicationResponsiveness .................................................................................... 20
UsingMultiprocessorsE?ciently .............................................................................................. 20
ImprovingProgramStructure .................................................................................................... 20
UsingFewerSystemResources .................................................................................................. 21
CombiningThreadsandRPC .................................................................................................... 21
MultithreadingConcepts ................................................................................................................... 21
ConcurrencyandParallelism ..................................................................................................... 21
MultithreadingStructure ............................................................................................................ 22
ThreadScheduling ....................................................................................................................... 23
ThreadCancellation .................................................................................................................... 23
ThreadSynchronization ............................................................................................................. 24
Usingthe64-bitArchitecture ............................................................................................................ 24
2 BasicThreadsProgramming..............................................................................................................27
LifecycleofaThread ........................................................................................................................... 27
ThePthreadsLibrary .......................................................................................................................... 28
CreatingaDefaultThread ..........................................................................................................28
WaitingforThreadTermination ............................................................................................... 30
SimpleThreadsExample............................................................................................................. 31
DetachingaThread ..................................................................................................................... 32
CreatingaKeyforThread-Speci?cData ................................................................................... 33
3DeletingtheThread-Speci?cDataKey ..................................................................................... 34
SettingThread-Speci?cData ......................................................................................................35
GettingThread-Speci?cData ..................................................................................................... 36
GlobalandPrivateThread-Speci?cDataExample .................................................................. 36
GettingtheThreadIdenti?er ......................................................................................................38
ComparingThreadIDs ............................................................................................................... 39
CallinganInitializationRoutineforaThread.......................................................................... 39
YieldingThreadExecution .........................................................................................................40
SettingtheThreadPolicyandSchedulingParameters ............................................................ 40
GettingtheThreadPolicyandSchedulingParameters ........................................................... 41
SettingtheThreadPriority ......................................................................................................... 42
SendingaSignaltoaThread ....................................................................................................... 43
AccessingtheSignalMaskoftheCallingThread ..................................................................... 43
ForkingSafely ............................................................................................................................... 44
TerminatingaThread ................................................................................................................. 45
FinishingUp ................................................................................................................................. 45
CancelaThread ............................................................................................................................ 46
CancellingaThread ..................................................................................................................... 47
EnablingorDisablingCancellation ........................................................................................... 48
SettingCancellationType ........................................................................................................... 48
CreatingaCancellationPoint .....................................................................................................49
PushingaHandlerOntotheStack ............................................................................................. 49
PullingaHandlerO?theStack .................................................................................................. 50
3 ThreadAttributes................................................................................................................................51
AttributeObject ................................................................................................................................... 51
InitializingAttributes .................................................................................................................. 52
DestroyingAttributes .................................................................................................................. 54
SettingDetachState ..................................................................................................................... 54
GettingtheDetachState .............................................................................................................. 55
SettingtheStackGuardSize .......................................................................................................56
GettingtheStackGuardSize ...................................................................................................... 57
SettingtheScope .......................................................................................................................... 57
GettingtheScope ......................................................................................................................... 58
SettingtheThreadConcurrencyLevel ...................................................................................... 59
Contents
MultithreadedProgrammingGuide October2012(Beta)4GettingtheThreadConcurrencyLevel ..................................................................................... 59
GettingtheSchedulingPolicy .................................................................................................... 61
SettingtheInheritedSchedulingPolicy .................................................................................... 62
GettingtheInheritedSchedulingPolicy ................................................................................... 62
SettingtheSchedulingParameters............................................................................................. 63
GettingtheSchedulingParameters ........................................................................................... 64
AboutStacks ................................................................................................................................. 65
SettingtheStackSize ................................................................................................................... 66
GettingtheStackSize .................................................................................................................. 67
SettingtheStackAddressandSize ............................................................................................. 68
GettingtheStackAddressandSize ............................................................................................ 69
4 ProgrammingwithSynchronizationObjects.................................................................................71
MutualExclusionLockAttributes ..................................................................................................... 72
InitializingaMutexAttributeObject......................................................................................... 73
DestroyingaMutexAttributeObject ........................................................................................ 75
SettingtheScopeofaMutex ....................................................................................................... 75
GettingtheScopeofaMutex ...................................................................................................... 76
SettingtheMutexTypeAttribute ............................................................................................... 76
GettingtheMutexTypeAttribute.............................................................................................. 77
SettingtheMutexAttribute"sProtocol ...................................................................................... 78
GettingtheMutexAttribute"sProtocol ..................................................................................... 80
SettingtheMutexAttribute"sPriorityCeiling .......................................................................... 80
GettingtheMutexAttribute"sPriorityCeiling ......................................................................... 81
SettingtheMutex"sPriorityCeiling ........................................................................................... 82
GettingtheMutex"sPriorityCeiling .......................................................................................... 82
SettingtheMutex"sRobustAttribute ......................................................................................... 83
GettingtheMutex"sRobustAttribute ........................................................................................ 84
UsingMutualExclusionLocks .......................................................................................................... 85
InitializingaMutex ...................................................................................................................... 86
MakingaMutexConsistent ........................................................................................................ 87
LockingaMutex ........................................................................................................................... 88
UnlockingaMutex ...................................................................................................................... 89
LockingaMutexWithoutBlocking ........................................................................................... 90
Contents
5LockingaMutexBeforeaSpeci?edAbsoluteTime................................................................. 91
LockingaMutexWithinaSpeci?edTimeInterval ................................................................. 92
DestroyingaMutex...................................................................................................................... 93
CodeExamplesofMutexLocking ............................................................................................. 93
UsingSpinLocks ................................................................................................................................. 98
InitializingaSpinLock ................................................................................................................ 99
AcquiringaSpinLock ...............................................................................................................100
UnlockingaSpinLock ..............................................................................................................101
DestroyingaSpinLock .............................................................................................................101
ConditionVariableAttributes .........................................................................................................102
InitializingaConditionVariableAttribute ............................................................................103
SettingtheScopeofaConditionVariable ..............................................................................104
GettingtheScopeofaConditionVariable .............................................................................105
SettingtheClockSelectionConditionVariable .....................................................................106
GettingtheClockSelectionConditionVariable ....................................................................106
UsingConditionVariables ...............................................................................................................107
InitializingaConditionVariable .............................................................................................108
BlockingonaConditionVariable ...........................................................................................109
UnblockingOneThread ...........................................................................................................110
BlockingUntilaSpeci?edTime ...............................................................................................111
BlockingForaSpeci?edInterval ..............................................................................................113
UnblockingAllThreads ............................................................................................................114
DestroyingtheConditionVariableState ................................................................................115
LostWake-UpProblem ............................................................................................................115
ProducerandConsumerProblem ...........................................................................................116
SynchronizationWithSemaphores ................................................................................................119
NamedandUnnamedSemaphores .........................................................................................120
CountingSemaphoresOverview .............................................................................................120
InitializingaSemaphore ...........................................................................................................121
IncrementingaSemaphore .......................................................................................................122
DecrementingaSemaphoreCount .........................................................................................124
DestroyingtheSemaphoreState ..............................................................................................124
ProducerandConsumerProblemUsingSemaphores .........................................................125
Contents
MultithreadedProgrammingGuide October2012(Beta)6Read-WriteLockAttributes .............................................................................................................126
InitializingaRead-WriteLockAttribute ................................................................................127
DestroyingaRead-WriteLockAttribute ................................................................................127
SettingaRead-WriteLockAttribute .......................................................................................128
GettingaRead-WriteLockAttribute ......................................................................................128
UsingRead-WriteLocks ..................................................................................................................129
InitializingaRead-WriteLock .................................................................................................129
AcquiringtheReadLockonRead-WriteLock ......................................................................130
AcquiringaReadLockonaRead-WriteLockBeforeaSpeci?edAbsoluteTime .............131 AcquiringaNon-BlockingReadLockonaRead-WriteLock ..............................................132AcquiringtheWriteLockonaRead-WriteLock ..................................................................133
AcquiringaNon-blockingWriteLockonaRead-WriteLock ............................................134 AcquiringaWriteLockonaRead-WriteLockBeforeaSpeci?edAbsoluteTime ............134UnlockingaRead-WriteLock ..................................................................................................135
DestroyingaRead-WriteLock .................................................................................................136
UsingBarrierSynchronization ........................................................................................................137
InitializingaSynchronizationBarrier .....................................................................................137
WaitingforThreadstoSynchronizeataBarrier ...................................................................138
DestroyingaSynchronizationBarrier .....................................................................................139
InitializingaBarrierAttributesObject ....................................................................................139
SettingaBarrierProcess-SharedAttribute .............................................................................140
GettingaBarrierProcess-SharedAttribute ............................................................................140
DestroyingaBarrierAttributesObject ...................................................................................141
SynchronizationAcrossProcessBoundaries .................................................................................142
ProducerandConsumerProblemExample ...........................................................................142
ComparingPrimitives ......................................................................................................................143
5 ProgrammingWiththeOracleSolarisSoftware..........................................................................145
ForkingIssuesinProcessCreation ..................................................................................................145
Fork-OneModel ........................................................................................................................146
Fork-AllModel ...........................................................................................................................148
ChoosingtheRightFork ...........................................................................................................149
ProcessCreation:execandexitIssues ..........................................................................................149
Timers .........................................................................................................................................149
Contents
7Alarms .........................................................................................................................................150
Pro?lingaMultithreadedProgram .........................................................................................150
ResourceLimits .................................................................................................................................151
LWPsandSchedulingClasses ..........................................................................................................151
TimeshareScheduling ...............................................................................................................152
RealtimeScheduling ..................................................................................................................152
FairShareScheduling ................................................................................................................153
ExtendingTraditionalSignals .........................................................................................................153
SynchronousSignals ..................................................................................................................154
AsynchronousSignals ...............................................................................................................154
ContinuationSemantics ...........................................................................................................155
OperationsonSignals ................................................................................................................155
Thread-DirectedSignals ...........................................................................................................157
CompletionSemantics ..............................................................................................................158
SignalHandlersandAsync-SignalSafety ................................................................................159
InterruptedWaitsonConditionVariables .............................................................................161
I/OIssues ............................................................................................................................................162
I/OasaRemoteProcedureCall ...............................................................................................162
TamedAsynchrony ...................................................................................................................162
AsynchronousI/O .....................................................................................................................162
SharedI/OandNewI/OSystemCalls .....................................................................................164
NewSystemCallsForReliableMultithreadedProgramming ..............................................1656 ProgrammingWithOracleSolarisThreads...................................................................................167
ComparingAPIsforOracleSolarisThreadsandPOSIXThreads ..............................................167
MajorAPIDi?erences ...............................................................................................................168
UniqueOracleSolarisThreadsFunctions ......................................................................................172
SuspendingThreadExecution .................................................................................................172
ContinuingaSuspendedThread .............................................................................................173
SimilarSynchronizationFunctions:Read-WriteLocks ...............................................................173
InitializeaRead-WriteLock .....................................................................................................174
Contents
MultithreadedProgrammingGuide October2012(Beta)8AcquiringaReadLock ..............................................................................................................175
TryingtoAcquireaReadLock .................................................................................................176
AcquiringaWriteLock .............................................................................................................176
TryingtoAcquireaWriteLock ................................................................................................177
UnlockaRead-WriteLock .......................................................................................................178
DestroyingtheRead-WriteLockState ....................................................................................178
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