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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- A D A . T A S K _ T E R M I N A T I O N --
--- --
--- B o d y --
--- --
--- Copyright (C) 2005-2009, Free Software Foundation, Inc. --
--- --
--- GNAT 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 3, or (at your option) any later ver- --
--- sion. GNAT 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. --
--- --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception, --
--- version 3.1, as published by the Free Software Foundation. --
--- --
--- You should have received a copy of the GNU General Public License and --
--- a copy of the GCC Runtime Library Exception along with this program; --
--- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
--- <http://www.gnu.org/licenses/>. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with System.Tasking;
-with System.Task_Primitives.Operations;
-with System.Parameters;
-with System.Soft_Links;
-
-with Ada.Unchecked_Conversion;
-
-package body Ada.Task_Termination is
-
- use type Ada.Task_Identification.Task_Id;
-
- package STPO renames System.Task_Primitives.Operations;
- package SSL renames System.Soft_Links;
-
- use System.Parameters;
-
- -----------------------
- -- Local subprograms --
- -----------------------
-
- function To_TT is new Ada.Unchecked_Conversion
- (System.Tasking.Termination_Handler, Termination_Handler);
-
- function To_ST is new Ada.Unchecked_Conversion
- (Termination_Handler, System.Tasking.Termination_Handler);
-
- function To_Task_Id is new Ada.Unchecked_Conversion
- (Ada.Task_Identification.Task_Id, System.Tasking.Task_Id);
-
- -----------------------------------
- -- Current_Task_Fallback_Handler --
- -----------------------------------
-
- function Current_Task_Fallback_Handler return Termination_Handler is
- begin
- -- There is no need for explicit protection against race conditions
- -- for this function because this function can only be executed by
- -- Self, and the Fall_Back_Handler can only be modified by Self.
-
- return To_TT (STPO.Self.Common.Fall_Back_Handler);
- end Current_Task_Fallback_Handler;
-
- -------------------------------------
- -- Set_Dependents_Fallback_Handler --
- -------------------------------------
-
- procedure Set_Dependents_Fallback_Handler
- (Handler : Termination_Handler)
- is
- Self : constant System.Tasking.Task_Id := STPO.Self;
-
- begin
- SSL.Abort_Defer.all;
-
- if Single_Lock then
- STPO.Lock_RTS;
- end if;
-
- STPO.Write_Lock (Self);
-
- Self.Common.Fall_Back_Handler := To_ST (Handler);
-
- STPO.Unlock (Self);
-
- if Single_Lock then
- STPO.Unlock_RTS;
- end if;
-
- SSL.Abort_Undefer.all;
- end Set_Dependents_Fallback_Handler;
-
- --------------------------
- -- Set_Specific_Handler --
- --------------------------
-
- procedure Set_Specific_Handler
- (T : Ada.Task_Identification.Task_Id;
- Handler : Termination_Handler)
- is
- begin
- -- Tasking_Error is raised if the task identified by T has already
- -- terminated. Program_Error is raised if the value of T is
- -- Null_Task_Id.
-
- if T = Ada.Task_Identification.Null_Task_Id then
- raise Program_Error;
- elsif Ada.Task_Identification.Is_Terminated (T) then
- raise Tasking_Error;
- else
- declare
- Target : constant System.Tasking.Task_Id := To_Task_Id (T);
-
- begin
- SSL.Abort_Defer.all;
-
- if Single_Lock then
- STPO.Lock_RTS;
- end if;
-
- STPO.Write_Lock (Target);
-
- Target.Common.Specific_Handler := To_ST (Handler);
-
- STPO.Unlock (Target);
-
- if Single_Lock then
- STPO.Unlock_RTS;
- end if;
-
- SSL.Abort_Undefer.all;
- end;
- end if;
- end Set_Specific_Handler;
-
- ----------------------
- -- Specific_Handler --
- ----------------------
-
- function Specific_Handler
- (T : Ada.Task_Identification.Task_Id) return Termination_Handler
- is
- begin
- -- Tasking_Error is raised if the task identified by T has already
- -- terminated. Program_Error is raised if the value of T is
- -- Null_Task_Id.
-
- if T = Ada.Task_Identification.Null_Task_Id then
- raise Program_Error;
- elsif Ada.Task_Identification.Is_Terminated (T) then
- raise Tasking_Error;
- else
- declare
- Target : constant System.Tasking.Task_Id := To_Task_Id (T);
- TH : Termination_Handler;
-
- begin
- SSL.Abort_Defer.all;
-
- if Single_Lock then
- STPO.Lock_RTS;
- end if;
-
- STPO.Write_Lock (Target);
-
- TH := To_TT (Target.Common.Specific_Handler);
-
- STPO.Unlock (Target);
-
- if Single_Lock then
- STPO.Unlock_RTS;
- end if;
-
- SSL.Abort_Undefer.all;
-
- return TH;
- end;
- end if;
- end Specific_Handler;
-
-end Ada.Task_Termination;