  
  
                          [1XHPC-GAP --- Reference Manual[101X
  
  
                           Release 4.16.0, 2026-06-02
  
  
                                 The GAP Group
  
                                Reimer Behrends
  
                                Vladimir Janjic
  
  
  
  The GAP Group
      Email:    [7Xmailto:support@gap-system.org[107X
      Homepage: [7Xhttps://www.gap-system.org[107X
  Reimer Behrends
      Email:    [7Xmailto:behrends@gmail.com[107X
  Vladimir Janjic
      Email:    [7Xmailto:vj32@st-andrews.ac.uk[107X
  
  -------------------------------------------------------
  [1XCopyright[101X
  [33X[0;0YCopyright  ©  (1987-2026)  for  the  core  part of the [5XGAP[105X system by the [5XGAP[105X
  Group.[133X
  
  [33X[0;0YMost  parts  of this distribution, including the core part of the [5XGAP[105X system
  are  distributed  under  the  terms  of  the GNU General Public License, see
  [7Xhttps://www.gnu.org/licenses/gpl.html[107X  or  the file [11XGPL[111X in the [11Xetc[111X directory
  of the [5XGAP[105X installation.[133X
  
  [33X[0;0YMore  detailed  information  about  copyright  and licenses of parts of this
  distribution can be found in [14X'Reference: Copyright and License'[114X.[133X
  
  [33X[0;0Y[5XGAP[105X  is  developed  over  a long time and has many authors and contributors.
  More   detailed   information  can  be  found  in  [14X'Reference:  Authors  and
  Maintainers'[114X.[133X
  
  
  -------------------------------------------------------
  
  
  [1XContents (hpc)[101X
  
  1 [33X[0;0YTasks[133X
    1.1 [33X[0;0YOverview[133X
    1.2 [33X[0;0YRunning tasks[133X
      1.2-1 RunTask
      1.2-2 ScheduleTask
      1.2-3 DelayTask
      1.2-4 RunAsyncTask
      1.2-5 ScheduleAsyncTask
      1.2-6 MakeTaskAsync
      1.2-7 ImmediateTask
      1.2-8 ExecuteTask
      1.2-9 WaitTask
      1.2-10 WaitAnyTask
      1.2-11 TaskResult
      1.2-12 CullIdleTasks
    1.3 [33X[0;0YInformation about tasks[133X
      1.3-1 TaskSuccess
      1.3-2 TaskError
      1.3-3 CurrentTask
      1.3-4 RunningTasks
      1.3-5 TaskStarted
      1.3-6 TaskFinished
      1.3-7 TaskIsAsync
    1.4 [33X[0;0YCancelling tasks[133X
      1.4-1 CancelTask
      1.4-2 TaskCancellationRequested
      1.4-3 OnTaskCancellation
      1.4-4 OnTaskCancellationReturn
    1.5 [33X[0;0YConditions[133X
    1.6 [33X[0;0YMilestones[133X
      1.6-1 NewMilestone
      1.6-2 ContributeToMilestone
      1.6-3 AchieveMilestone
      1.6-4 IsMilestoneAchieved
  2 [33X[0;0YVariables in HPC-GAP[133X
    2.1 [33X[0;0YGlobal variables[133X
    2.2 [33X[0;0YThread-local variables[133X
      2.2-1 MakeThreadLocal
      2.2-2 BindThreadLocal
      2.2-3 BindThreadLocalConstructor
      2.2-4 ThreadVar
  3 [33X[0;0YHow HPC-GAP organizes shared memory: Regions[133X
    3.1 [33X[0;0YThread-local regions[133X
    3.2 [33X[0;0YShared regions[133X
    3.3 [33X[0;0YOrdering of shared regions[133X
    3.4 [33X[0;0YThe public region[133X
    3.5 [33X[0;0YThe read-only region[133X
    3.6 [33X[0;0YMigrating objects between regions[133X
    3.7 [33X[0;0YRegion names[133X
    3.8 [33X[0;0YControlling access to regions[133X
    3.9 [33X[0;0YFunctions relating to regions[133X
      3.9-1 NewRegion
      3.9-2 NewLibraryRegion
      3.9-3 NewSystemRegion
      3.9-4 NewKernelRegion
      3.9-5 NewInternalRegion
      3.9-6 NewSpecialRegion
      3.9-7 RegionOf
      3.9-8 RegionPrecedence
      3.9-9 ShareObj
      3.9-10 ShareLibraryObj
      3.9-11 ShareSystemObj
      3.9-12 ShareKernelObj
      3.9-13 ShareInternalObj
      3.9-14 ShareSpecialObj
      3.9-15 ShareSingleObj
      3.9-16 ShareSingleLibraryObj
      3.9-17 ShareSingleSystemObj
      3.9-18 ShareSingleKernelObj
      3.9-19 ShareSingleInternalObj
      3.9-20 ShareSingleSpecialObj
      3.9-21 MigrateObj
      3.9-22 MigrateSingleObj
      3.9-23 LockAndMigrateObj
      3.9-24 IncorporateObj
      3.9-25 AtomicIncorporateObj
      3.9-26 AdoptObj
      3.9-27 AdoptSingleObj
      3.9-28 LockAndAdoptObj
      3.9-29 CopyRegion
      3.9-30 IsPublic
      3.9-31 IsThreadLocal
      3.9-32 IsShared
      3.9-33 HaveReadAccess
      3.9-34 HaveWriteAccess
      3.9-35 MakeReadOnlyObj
      3.9-36 MakeReadOnlySingleObj
      3.9-37 IsReadOnlyObj
      3.9-38 SetRegionName
      3.9-39 ClearRegionName
      3.9-40 RegionName
      3.9-41 ViewShared
      3.9-42 UNSAFE_VIEW
      3.9-43 [33X[0;0YThe [10Xatomic[110X statement.[133X
    3.10 [33X[0;0YAtomic functions[133X
    3.11 [33X[0;0YWrite-once functionality[133X
      3.11-1 BindOnce
      3.11-2 TestBindOnce
      3.11-3 BindOnceExpr
      3.11-4 TestBindOnceExpr
      3.11-5 StrictBindOnce
  4 [33X[0;0YConsole User Interface[133X
    4.1 [33X[0;0YConsole UI commands[133X
      4.1-1 [33X[0;0Y!shell [name][133X
      4.1-2 [33X[0;0Y!fork [name][133X
      4.1-3 [33X[0;0Y!list[133X
      4.1-4 [33X[0;0Y!kill id[133X
      4.1-5 [33X[0;0Y!break id[133X
      4.1-6 [33X[0;0Y!name [id] name[133X
      4.1-7 [33X[0;0Y!info id[133X
      4.1-8 [33X[0;0Y!hide [id|*][133X
      4.1-9 [33X[0;0Y!watch [id|*][133X
      4.1-10 [33X[0;0Y!keep num[133X
      4.1-11 [33X[0;0Y!prompt (id|*) string[133X
      4.1-12 [33X[0;0Y!prefix (id|*) string[133X
      4.1-13 [33X[0;0Y!select id[133X
      4.1-14 [33X[0;0Y!next[133X
      4.1-15 [33X[0;0Y!previous[133X
      4.1-16 [33X[0;0Y!replay num [id][133X
      4.1-17 [33X[0;0Y!id[133X
      4.1-18 [33X[0;0Y!source file[133X
      4.1-19 [33X[0;0Y!alias shortcut expansion[133X
      4.1-20 [33X[0;0Y!unalias shortcut[133X
      4.1-21 [33X[0;0Y!eval expr[133X
      4.1-22 [33X[0;0Y!run function string[133X
    4.2 [33X[0;0YGAP functions to access the Shell UI[133X
      4.2-1 TextUIRegisterCommand
      4.2-2 TextUIForegroundThread
      4.2-3 TextUIForegroundThreadName
      4.2-4 TextUISelectThread
      4.2-5 TextUIOutputHistory
      4.2-6 TextUISetOutputHistoryLength
      4.2-7 TextUINewSession
      4.2-8 TextUIRunCommand
      4.2-9 TextUIWritePrompt
  5 [33X[0;0YAtomic objects[133X
    5.1 [33X[0;0YAtomic lists[133X
      5.1-1 AtomicList
      5.1-2 FixedAtomicList
      5.1-3 MakeFixedAtomicList
      5.1-4 FromAtomicList
      5.1-5 ATOMIC_ADDITION
      5.1-6 COMPARE_AND_SWAP
    5.2 [33X[0;0YAtomic records and component objects[133X
      5.2-1 AtomicRecord
      5.2-2 FromAtomicRecord
    5.3 [33X[0;0YReplacement policy functions[133X
      5.3-1 MakeWriteOnceAtomic
      5.3-2 MakeStrictWriteOnceAtomic
      5.3-3 MakeReadWriteAtomic
    5.4 [33X[0;0YThread-local records[133X
      5.4-1 ThreadLocalRecord
      5.4-2 SetTLDefault
      5.4-3 SetTLConstructor
  6 [33X[0;0YThread functions[133X
    6.1 [33X[0;0YThread functions[133X
      6.1-1 CreateThread
      6.1-2 WaitThread
      6.1-3 CurrentThread
      6.1-4 ThreadID
      6.1-5 KillThread
      6.1-6 PauseThread
      6.1-7 ResumeThread
      6.1-8 InterruptThread
      6.1-9 SetInterruptHandler
      6.1-10 NewInterruptID
      6.1-11 MAX_INTERRUPT
  7 [33X[0;0YChannels[133X
    7.1 [33X[0;0YChannels[133X
      7.1-1 CreateChannel
      7.1-2 SendChannel
      7.1-3 TransmitChannel
      7.1-4 TrySendChannel
      7.1-5 TryTransmitChannel
      7.1-6 ReceiveChannel
      7.1-7 TryReceiveChannel
      7.1-8 MultiSendChannel
      7.1-9 TryMultiSendChannel
      7.1-10 MultiReceiveChannel
      7.1-11 ReceiveAnyChannel
      7.1-12 ReceiveAnyChannelWithIndex
      7.1-13 TallyChannel
      7.1-14 InspectChannel
  8 [33X[0;0YSemaphores[133X
    8.1 [33X[0;0YSemaphores[133X
      8.1-1 CreateSemaphore
      8.1-2 WaitSemaphore
      8.1-3 SignalSemaphore
      8.1-4 [33X[0;0YSimulating locks[133X
  9 [33X[0;0YSynchronization variables[133X
    9.1 [33X[0;0YSynchronization variables[133X
      9.1-1 CreateSyncVar
      9.1-2 SyncWrite
      9.1-3 SyncRead
  10 [33X[0;0YSerialization support[133X
    10.1 [33X[0;0YSerialization support[133X
      10.1-1 SerializeToNativeString
      10.1-2 DeserializeNativeString
      10.1-3 InstallTypeSerializationTag
      10.1-4 InstallSerializer
      10.1-5 InstallDeserializer
  11 [33X[0;0YLow-level functionality[133X
    11.1 [33X[0;0YExplicit lock and unlock primitives[133X
      11.1-1 LOCK
      11.1-2 TRYLOCK
      11.1-3 UNLOCK
    11.2 [33X[0;0YHash locks[133X
      11.2-1 HASH_LOCK
      11.2-2 HASH_UNLOCK
      11.2-3 HASH_LOCK_SHARED
      11.2-4 HASH_UNLOCK_SHARED
    11.3 [33X[0;0YMigration to the public region[133X
      11.3-1 MAKE_PUBLIC
      11.3-2 MAKE_PUBLIC_NORECURSE
    11.4 [33X[0;0YMemory barriers[133X
      11.4-1 ORDERED_WRITE
      11.4-2 ORDERED_READ
    11.5 [33X[0;0YObject manipulation[133X
      11.5-1 SWITCH_OBJ
      11.5-2 FORCE_SWITCH_OBJ
  
  
  [32X
