------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . S O F T _ L I N K S . T A S K I N G -- -- -- -- B o d y -- -- -- -- Copyright (C) 2004-2006, 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 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. -- -- -- ------------------------------------------------------------------------------ pragma Style_Checks (All_Checks); -- Turn off subprogram alpha ordering check, since we group soft link -- bodies and dummy soft link bodies together separately in this unit. pragma Polling (Off); -- Turn polling off for this package. We don't need polling during any -- of the routines in this package, and more to the point, if we try -- to poll it can cause infinite loops. with System.Task_Primitives.Operations; -- Used for Self -- Timed_Delay with System.Tasking; -- Used for Task_Id -- Cause_Of_Termination with Ada.Exceptions; -- Used for Exception_Id -- Exception_Occurrence -- Save_Occurrence with Ada.Exceptions.Is_Null_Occurrence; package body System.Soft_Links.Tasking is package STPO renames System.Task_Primitives.Operations; package SSL renames System.Soft_Links; use Ada.Exceptions; use type System.Tasking.Task_Id; use type System.Tasking.Termination_Handler; ---------------- -- Local Data -- ---------------- Initialized : Boolean := False; -- Boolean flag that indicates whether the tasking soft links have -- already been set. ----------------------------------------------------------------- -- Tasking Versions of Services Needed by Non-Tasking Programs -- ----------------------------------------------------------------- function Get_Jmpbuf_Address return Address; procedure Set_Jmpbuf_Address (Addr : Address); -- Get/Set Jmpbuf_Address for current task function Get_Sec_Stack_Addr return Address; procedure Set_Sec_Stack_Addr (Addr : Address); -- Get/Set location of current task's secondary stack function Get_Current_Excep return SSL.EOA; -- Task-safe version of SSL.Get_Current_Excep procedure Timed_Delay_T (Time : Duration; Mode : Integer); -- Task-safe version of SSL.Timed_Delay procedure Task_Termination_Handler_T (Excep : SSL.EO); -- Task-safe version of the task termination procedure -------------------------- -- Soft-Link Get Bodies -- -------------------------- function Get_Current_Excep return SSL.EOA is begin return STPO.Self.Common.Compiler_Data.Current_Excep'Access; end Get_Current_Excep; function Get_Jmpbuf_Address return Address is begin return STPO.Self.Common.Compiler_Data.Jmpbuf_Address; end Get_Jmpbuf_Address; function Get_Sec_Stack_Addr return Address is begin return STPO.Self.Common.Compiler_Data.Sec_Stack_Addr; end Get_Sec_Stack_Addr; -------------------------- -- Soft-Link Set Bodies -- -------------------------- procedure Set_Jmpbuf_Address (Addr : Address) is begin STPO.Self.Common.Compiler_Data.Jmpbuf_Address := Addr; end Set_Jmpbuf_Address; procedure Set_Sec_Stack_Addr (Addr : Address) is begin STPO.Self.Common.Compiler_Data.Sec_Stack_Addr := Addr; end Set_Sec_Stack_Addr; ------------------- -- Timed_Delay_T -- ------------------- procedure Timed_Delay_T (Time : Duration; Mode : Integer) is Self_Id : constant System.Tasking.Task_Id := STPO.Self; begin -- In case pragma Detect_Blocking is active then Program_Error -- must be raised if this potentially blocking operation -- is called from a protected operation. if System.Tasking.Detect_Blocking and then Self_Id.Common.Protected_Action_Nesting > 0 then raise Program_Error with "potentially blocking operation"; else Abort_Defer.all; STPO.Timed_Delay (Self_Id, Time, Mode); Abort_Undefer.all; end if; end Timed_Delay_T; -------------------------------- -- Task_Termination_Handler_T -- -------------------------------- procedure Task_Termination_Handler_T (Excep : SSL.EO) is Self_Id : constant System.Tasking.Task_Id := STPO.Self; Cause : System.Tasking.Cause_Of_Termination; EO : Ada.Exceptions.Exception_Occurrence; begin -- We can only be here because we are terminating the environment task. -- Task termination for the rest of the tasks is handled in the -- Task_Wrapper. pragma Assert (Self_Id = STPO.Environment_Task); -- Normal task termination if Is_Null_Occurrence (Excep) then Cause := System.Tasking.Normal; Ada.Exceptions.Save_Occurrence (EO, Ada.Exceptions.Null_Occurrence); -- Abnormal task termination elsif Exception_Identity (Excep) = Standard'Abort_Signal'Identity then Cause := System.Tasking.Abnormal; Ada.Exceptions.Save_Occurrence (EO, Ada.Exceptions.Null_Occurrence); -- Termination because of an unhandled exception else Cause := System.Tasking.Unhandled_Exception; Ada.Exceptions.Save_Occurrence (EO, Excep); end if; -- There is no need for explicit protection against race conditions -- for this part because it can only be executed by the environment -- task after all the other tasks have been finalized. if Self_Id.Common.Specific_Handler /= null then Self_Id.Common.Specific_Handler.all (Cause, Self_Id, EO); elsif Self_Id.Common.Fall_Back_Handler /= null then Self_Id.Common.Fall_Back_Handler.all (Cause, Self_Id, EO); end if; end Task_Termination_Handler_T; ----------------------------- -- Init_Tasking_Soft_Links -- ----------------------------- procedure Init_Tasking_Soft_Links is begin -- Set links only if not set already if not Initialized then -- Mark tasking soft links as initialized Initialized := True; -- The application being executed uses tasking so that the tasking -- version of the following soft links need to be used. SSL.Get_Jmpbuf_Address := Get_Jmpbuf_Address'Access; SSL.Set_Jmpbuf_Address := Set_Jmpbuf_Address'Access; SSL.Get_Sec_Stack_Addr := Get_Sec_Stack_Addr'Access; SSL.Set_Sec_Stack_Addr := Set_Sec_Stack_Addr'Access; SSL.Get_Current_Excep := Get_Current_Excep'Access; SSL.Timed_Delay := Timed_Delay_T'Access; SSL.Task_Termination_Handler := Task_Termination_Handler_T'Access; -- No need to create a new Secondary Stack, since we will use the -- default one created in s-secsta.adb SSL.Set_Sec_Stack_Addr (SSL.Get_Sec_Stack_Addr_NT); SSL.Set_Jmpbuf_Address (SSL.Get_Jmpbuf_Address_NT); end if; end Init_Tasking_Soft_Links; end System.Soft_Links.Tasking;