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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;