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HPC-GAP — Reference Manual

Release 4.12.1, 2022-10-20

The GAP Group
Email: support@gap-system.org
Homepage: https://www.gap-system.org

Reimer Behrends
Email: behrends@gmail.com

Vladimir Janjic
Email: vj32@st-andrews.ac.uk

Copyright

Copyright © (1987-2022) for the core part of the GAP system by the GAP Group.

Most parts of this distribution, including the core part of the GAP system are distributed under the terms of the GNU General Public License, see https://www.gnu.org/licenses/gpl.html or the file GPL in the etc directory of the GAP installation.

More detailed information about copyright and licenses of parts of this distribution can be found in Reference: Copyright and License.

GAP is developed over a long time and has many authors and contributors. More detailed information can be found in Reference: Authors and Maintainers.

Contents

1 Tasks
 1.1 Overview
 1.2 Running tasks

  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 Information about tasks

  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 Cancelling tasks

  1.4-1 CancelTask
  1.4-2 TaskCancellationRequested
  1.4-3 OnTaskCancellation
  1.4-4 OnTaskCancellationReturn
 1.5 Conditions
 1.6 Milestones

  1.6-1 NewMilestone
  1.6-2 ContributeToMilestone
  1.6-3 AchieveMilestone
  1.6-4 IsMilestoneAchieved
2 Variables in HPC-GAP
 2.1 Global variables
 2.2 Thread-local variables

  2.2-1 MakeThreadLocal
  2.2-2 BindThreadLocal
  2.2-3 BindThreadLocalConstructor
  2.2-4 ThreadVar
3 How HPC-GAP organizes shared memory: Regions
 3.1 Thread-local regions
 3.2 Shared regions
 3.3 Ordering of shared regions
 3.4 The public region
 3.5 The read-only region
 3.6 Migrating objects between regions
 3.7 Region names
 3.8 Controlling access to regions
 3.9 Functions relating to regions

  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 The atomic statement.
 3.10 Atomic functions
 3.11 Write-once functionality

  3.11-1 BindOnce
  3.11-2 TestBindOnce
  3.11-3 BindOnceExpr
  3.11-4 TestBindOnceExpr
  3.11-5 StrictBindOnce
4 Console User Interface
 4.1 Console UI commands

  4.1-1 !shell [name]
  4.1-2 !fork [name]
  4.1-3 !list
  4.1-4 !kill id
  4.1-5 !break id
  4.1-6 !name [id] name
  4.1-7 !info id
  4.1-8 !hide [id|*]
  4.1-9 !watch [id|*]
  4.1-10 !keep num
  4.1-11 !prompt (id|*) string
  4.1-12 !prefix (id|*) string
  4.1-13 !select id
  4.1-14 !next
  4.1-15 !previous
  4.1-16 !replay num [id]
  4.1-17 !id
  4.1-18 !source file
  4.1-19 !alias shortcut expansion
  4.1-20 !unalias shortcut
  4.1-21 !eval expr
  4.1-22 !run function string
 4.2 GAP functions to access the Shell UI

  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 Atomic objects
 5.1 Atomic lists

  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 Atomic records and component objects

  5.2-1 AtomicRecord
  5.2-2 FromAtomicRecord
 5.3 Replacement policy functions

  5.3-1 MakeWriteOnceAtomic
  5.3-2 MakeStrictWriteOnceAtomic
  5.3-3 MakeReadWriteAtomic
 5.4 Thread-local records

  5.4-1 ThreadLocalRecord
  5.4-2 SetTLDefault
  5.4-3 SetTLConstructor
6 Thread functions
 6.1 Thread functions

  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 Channels
 7.1 Channels

  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 Semaphores
 8.1 Semaphores

  8.1-1 CreateSemaphore
  8.1-2 WaitSemaphore
  8.1-3 SignalSemaphore
  8.1-4 Simulating locks
9 Synchronization variables
 9.1 Synchronization variables

  9.1-1 CreateSyncVar
  9.1-2 SyncWrite
  9.1-3 SyncRead
10 Serialization support
 10.1 Serialization support

  10.1-1 SerializeToNativeString
  10.1-2 DeserializeNativeString
  10.1-3 InstallTypeSerializationTag
  10.1-4 InstallSerializer
  10.1-5 InstallDeserializer
11 Low-level functionality
 11.1 Explicit lock and unlock primitives

  11.1-1 LOCK
  11.1-2 TRYLOCK
  11.1-3 UNLOCK
 11.2 Hash locks

  11.2-1 HASH_LOCK
  11.2-2 HASH_UNLOCK
  11.2-3 HASH_LOCK_SHARED
  11.2-4 HASH_UNLOCK_SHARED
 11.3 Migration to the public region

  11.3-1 MAKE_PUBLIC
  11.3-2 MAKE_PUBLIC_NORECURSE
 11.4 Memory barriers

  11.4-1 ORDERED_WRITE
  11.4-2 ORDERED_READ
 11.5 Object manipulation

  11.5-1 SWITCH_OBJ
  11.5-2 FORCE_SWITCH_OBJ
Index

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