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Diffstat (limited to 'gcc-4.2.1/gcc/ada/a-taster.adb')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/a-taster.adb | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/a-taster.adb b/gcc-4.2.1/gcc/ada/a-taster.adb new file mode 100644 index 000000000..8b0be0a22 --- /dev/null +++ b/gcc-4.2.1/gcc/ada/a-taster.adb @@ -0,0 +1,209 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |