------------------------------------------------------------------------------ -- -- -- 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) 2005-2006, Free Software Foundation, Inc. -- -- -- -- This specification is derived from the Ada Reference Manual for use with -- -- GNAT. The copyright notice above, and the license provisions that follow -- -- apply solely to the contents of the part following the private keyword. -- -- -- -- 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 2, 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. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; 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. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with System.Tasking; -- used for Task_Id with System.Task_Primitives.Operations; -- used for Self -- Write_Lock -- Unlock -- Lock_RTS -- Unlock_RTS with System.Parameters; -- used for Single_Lock with System.Soft_Links; -- use for Abort_Defer -- Abort_Undefer with 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 Unchecked_Conversion (System.Tasking.Termination_Handler, Termination_Handler); function To_ST is new Unchecked_Conversion (Termination_Handler, System.Tasking.Termination_Handler); function To_Task_Id is new 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;