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Diffstat (limited to 'gcc-4.4.0/gcc/ada/s-taprob.adb')
-rw-r--r-- | gcc-4.4.0/gcc/ada/s-taprob.adb | 281 |
1 files changed, 0 insertions, 281 deletions
diff --git a/gcc-4.4.0/gcc/ada/s-taprob.adb b/gcc-4.4.0/gcc/ada/s-taprob.adb deleted file mode 100644 index ee06529d1..000000000 --- a/gcc-4.4.0/gcc/ada/s-taprob.adb +++ /dev/null @@ -1,281 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- --- -- --- S Y S T E M . T A S K I N G . P R O T E C T E D _ O B J E C T S -- --- -- --- B o d y -- --- -- --- Copyright (C) 1991-1994, Florida State University -- --- Copyright (C) 1995-2008, AdaCore -- --- -- --- GNARL is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 2, or (at your option) any later ver- -- --- sion. GNARL is distributed in the hope that it will be useful, but WITH- -- --- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- --- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- --- for more details. You should have received a copy of the GNU General -- --- Public License distributed with GNARL; see file COPYING. If not, write -- --- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- --- Boston, MA 02110-1301, USA. -- --- -- --- As a special exception, if other files instantiate generics from this -- --- unit, or you link this unit with other files to produce an executable, -- --- this unit does not by itself cause the resulting executable to be -- --- covered by the GNU General Public License. This exception does not -- --- however invalidate any other reasons why the executable file might be -- --- covered by the GNU Public License. -- --- -- --- GNARL was developed by the GNARL team at Florida State University. -- --- Extensive contributions were provided by Ada Core Technologies, Inc. -- --- -- ------------------------------------------------------------------------------- - -pragma Polling (Off); --- Turn off polling, we do not want ATC polling to take place during --- tasking operations. It causes infinite loops and other problems. - -with System.Task_Primitives.Operations; -with System.Parameters; -with System.Traces; -with System.Soft_Links.Tasking; - -package body System.Tasking.Protected_Objects is - - use System.Task_Primitives.Operations; - use System.Traces; - - ---------------- - -- Local Data -- - ---------------- - - Locking_Policy : Character; - pragma Import (C, Locking_Policy, "__gl_locking_policy"); - - ------------------------- - -- Finalize_Protection -- - ------------------------- - - procedure Finalize_Protection (Object : in out Protection) is - begin - Finalize_Lock (Object.L'Unrestricted_Access); - end Finalize_Protection; - - --------------------------- - -- Initialize_Protection -- - --------------------------- - - procedure Initialize_Protection - (Object : Protection_Access; - Ceiling_Priority : Integer) - is - Init_Priority : Integer := Ceiling_Priority; - - begin - if Init_Priority = Unspecified_Priority then - Init_Priority := System.Priority'Last; - end if; - - Initialize_Lock (Init_Priority, Object.L'Access); - Object.Ceiling := System.Any_Priority (Init_Priority); - Object.New_Ceiling := System.Any_Priority (Init_Priority); - Object.Owner := Null_Task; - end Initialize_Protection; - - ----------------- - -- Get_Ceiling -- - ----------------- - - function Get_Ceiling - (Object : Protection_Access) return System.Any_Priority is - begin - return Object.New_Ceiling; - end Get_Ceiling; - - ---------- - -- Lock -- - ---------- - - procedure Lock (Object : Protection_Access) is - Ceiling_Violation : Boolean; - - begin - -- The lock is made without deferring abort - - -- Therefore the abort has to be deferred before calling this routine. - -- This means that the compiler has to generate a Defer_Abort call - -- before the call to Lock. - - -- The caller is responsible for undeferring abort, and compiler - -- generated calls must be protected with cleanup handlers to ensure - -- that abort is undeferred in all cases. - - -- If pragma Detect_Blocking is active then, as described in the ARM - -- 9.5.1, par. 15, we must check whether this is an external call on a - -- protected subprogram with the same target object as that of the - -- protected action that is currently in progress (i.e., if the caller - -- is already the protected object's owner). If this is the case hence - -- Program_Error must be raised. - - if Detect_Blocking and then Object.Owner = Self then - raise Program_Error; - end if; - - Write_Lock (Object.L'Access, Ceiling_Violation); - - if Parameters.Runtime_Traces then - Send_Trace_Info (PO_Lock); - end if; - - if Ceiling_Violation then - raise Program_Error; - end if; - - -- We are entering in a protected action, so that we increase the - -- protected object nesting level (if pragma Detect_Blocking is - -- active), and update the protected object's owner. - - if Detect_Blocking then - declare - Self_Id : constant Task_Id := Self; - begin - -- Update the protected object's owner - - Object.Owner := Self_Id; - - -- Increase protected object nesting level - - Self_Id.Common.Protected_Action_Nesting := - Self_Id.Common.Protected_Action_Nesting + 1; - end; - end if; - end Lock; - - -------------------- - -- Lock_Read_Only -- - -------------------- - - procedure Lock_Read_Only (Object : Protection_Access) is - Ceiling_Violation : Boolean; - - begin - -- If pragma Detect_Blocking is active then, as described in the ARM - -- 9.5.1, par. 15, we must check whether this is an external call on - -- protected subprogram with the same target object as that of the - -- protected action that is currently in progress (i.e., if the caller - -- is already the protected object's owner). If this is the case hence - -- Program_Error must be raised. - -- - -- Note that in this case (getting read access), several tasks may have - -- read ownership of the protected object, so that this method of - -- storing the (single) protected object's owner does not work reliably - -- for read locks. However, this is the approach taken for two major - -- reasons: first, this function is not currently being used (it is - -- provided for possible future use), and second, it largely simplifies - -- the implementation. - - if Detect_Blocking and then Object.Owner = Self then - raise Program_Error; - end if; - - Read_Lock (Object.L'Access, Ceiling_Violation); - - if Parameters.Runtime_Traces then - Send_Trace_Info (PO_Lock); - end if; - - if Ceiling_Violation then - raise Program_Error; - end if; - - -- We are entering in a protected action, so we increase the protected - -- object nesting level (if pragma Detect_Blocking is active). - - if Detect_Blocking then - declare - Self_Id : constant Task_Id := Self; - begin - -- Update the protected object's owner - - Object.Owner := Self_Id; - - -- Increase protected object nesting level - - Self_Id.Common.Protected_Action_Nesting := - Self_Id.Common.Protected_Action_Nesting + 1; - end; - end if; - end Lock_Read_Only; - - ----------------- - -- Set_Ceiling -- - ----------------- - - procedure Set_Ceiling - (Object : Protection_Access; - Prio : System.Any_Priority) is - begin - Object.New_Ceiling := Prio; - end Set_Ceiling; - - ------------ - -- Unlock -- - ------------ - - procedure Unlock (Object : Protection_Access) is - begin - -- We are exiting from a protected action, so that we decrease the - -- protected object nesting level (if pragma Detect_Blocking is - -- active), and remove ownership of the protected object. - - if Detect_Blocking then - declare - Self_Id : constant Task_Id := Self; - - begin - -- Calls to this procedure can only take place when being within - -- a protected action and when the caller is the protected - -- object's owner. - - pragma Assert (Self_Id.Common.Protected_Action_Nesting > 0 - and then Object.Owner = Self_Id); - - -- Remove ownership of the protected object - - Object.Owner := Null_Task; - - -- We are exiting from a protected action, so we decrease the - -- protected object nesting level. - - Self_Id.Common.Protected_Action_Nesting := - Self_Id.Common.Protected_Action_Nesting - 1; - end; - end if; - - -- Before releasing the mutex we must actually update its ceiling - -- priority if it has been changed. - - if Object.New_Ceiling /= Object.Ceiling then - if Locking_Policy = 'C' then - System.Task_Primitives.Operations.Set_Ceiling - (Object.L'Access, Object.New_Ceiling); - end if; - - Object.Ceiling := Object.New_Ceiling; - end if; - - Unlock (Object.L'Access); - - if Parameters.Runtime_Traces then - Send_Trace_Info (PO_Unlock); - end if; - end Unlock; - -begin - -- Ensure that tasking is initialized, as well as tasking soft links - -- when using protected objects. - - Tasking.Initialize; - System.Soft_Links.Tasking.Init_Tasking_Soft_Links; -end System.Tasking.Protected_Objects; |