a1200   NEWS   APPS   DOCS   ABOUT
a1200
----
a1200
----
Autodocs
 Libraries:
 exec.library
  AVL_AddNode
  AVL_FindFirstNode
  AVL_FindLastNode
  AVL_FindNextNodeByAddress
  AVL_FindNextNodeByKey
  AVL_FindNode
  AVL_FindPrevNodeByAddress
  AVL_FindPrevNodeByKey
  AVL_RemNodeByAddress
  AVL_RemNodeByKey
  AbortIO
  AddDevice
  AddHead
  AddIntServer
  AddLibrary
  AddMemHandler
  AddMemList
  AddPort
  AddResource
  AddSemaphore
  AddTail
  AddTask
  Alert
  AllocAbs
  AllocEntry
  AllocMem
  AllocPooled
  AllocSignal
  AllocTrap
  AllocVec
  Allocate
  AttemptSemaphore
  AttemptSemaphoreShared
  AvailMem
  CacheClearE
  CacheClearU
  CacheControl
  CachePostDMA
  CachePreDMA
  Cause
  CheckIO
  CloseDevice
  CloseLibrary
  ColdReboot
  CopyMem
  CopyMemQuick
  CreateIORequest
  CreateMsgPort
  CreatePool
  Deallocate
  Debug
  DeleteIORequest
  DeleteMsgPort
  DeletePool
  Disable
  DoIO
  Enable
  Enqueue
  FindName
  FindPort
  FindResident
  FindSemaphore
  FindTask
  Forbid
  FreeEntry
  FreeMem
  FreePooled
  FreeSignal
  FreeTrap
  FreeVec
  GetCC
  GetMsg
  InitCode
  InitResident
  InitSemaphore
  InitStruct
  Insert
  MakeFunctions
  MakeLibrary
  ObtainQuickVector
  ObtainSemaphore
  ObtainSemaphoreList
  ObtainSemaphoreShared
  OldOpenLibrary
  OpenDevice
  OpenLibrary
  OpenResource
  Permit
  Procure
  PutMsg
  RawDoFmt
  ReleaseSemaphore
  ReleaseSemaphoreList
  RemDevice
  RemHead
  RemIntServer
  RemLibrary
  RemMemHandler
  RemPort
  RemResource
  RemSemaphore
  RemTail
  RemTask
  Remove
  ReplyMsg
  SendIO
  SetExcept
  SetFunction
  SetIntVector
  SetSR
  SetSignal
  SetTaskPri
  Signal
  StackSwap
  SumKickData
  SumLibrary
  SuperState
  Supervisor
  TypeOfMem
  UserState
  Vacate
  Wait
  WaitIO
  WaitPort
Include
GuruMeditation
Docs » Autodocs » exec.library » ObtainSemaphoreList

NAME

	ObtainSemaphoreList -- get a list of semaphores.

SYNOPSIS

	ObtainSemaphoreList(list)
A0
void ObtainSemaphoreList(struct List *);

FUNCTION

	Signal semaphores may be linked together into a list. This function
takes a list of these semaphores and attempts to lock all of them at
once. This call is preferable to applying ObtainSemaphore() to each
element in the list because it attempts to lock all the elements
simultaneously, and won't deadlock if someone is attempting to lock
in some other order.
This function assumes that only one task at a time will attempt to
lock the entire list of semaphores. In other words, there needs to
be a higher level lock (perhaps another signal semaphore...) that is
used before someone attempts to lock the semaphore list via
ObtainSemaphoreList().
Note that deadlocks may result if this call is used AND someone
attempts to use ObtainSemaphore() to lock more than one semaphore on
the list. If you wish to lock more than semaphore (but not all of
them) then you should obtain the higher level lock (see above)

INPUTS

       list -- a list of signal semaphores

SEE ALSO

ObtainSemaphoreShared(), InitSemaphore(), ReleaseSemaphore(), AttemptSemaphore(), ObtainSemaphoreShared(), Procure(), Vacate()

Comments

Name:
E-mail: Use this if you want a message if you get a response, will not be shown.
Comment:
Select correct short for:

Alpha Flight 1970

AFL
SPB
PHA
ANA

Comments:

$VER: d0.se 1.14 Copyright © 2011-2020 Tobias Geijersson support at d0 dot se