From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/ada/a-taster.adb | 191 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 191 insertions(+) create mode 100644 gcc/ada/a-taster.adb (limited to 'gcc/ada/a-taster.adb') diff --git a/gcc/ada/a-taster.adb b/gcc/ada/a-taster.adb new file mode 100644 index 000000000..c4b4aaa81 --- /dev/null +++ b/gcc/ada/a-taster.adb @@ -0,0 +1,191 @@ +------------------------------------------------------------------------------ +-- -- +-- 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 -- +-- . -- +-- -- +-- 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; -- cgit v1.2.3