| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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, 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, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, 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 |
| |
| with Ada.Exceptions; |
| -- Used for Raise_Exception |
| |
| package body System.Soft_Links.Tasking is |
| |
| package STPO renames System.Task_Primitives.Operations; |
| package SSL renames System.Soft_Links; |
| |
| ---------------- |
| -- 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_Machine_State_Addr return Address; |
| procedure Set_Machine_State_Addr (Addr : Address); |
| -- Get/Set the address for storing the current task's machine state |
| |
| 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 |
| |
| -------------------------- |
| -- 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_Machine_State_Addr return Address is |
| begin |
| return STPO.Self.Common.Compiler_Data.Machine_State_Addr; |
| end Get_Machine_State_Addr; |
| |
| 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_Machine_State_Addr (Addr : Address) is |
| begin |
| STPO.Self.Common.Compiler_Data.Machine_State_Addr := Addr; |
| end Set_Machine_State_Addr; |
| |
| 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 |
| Ada.Exceptions.Raise_Exception |
| (Program_Error'Identity, "potentially blocking operation"); |
| else |
| STPO.Timed_Delay (Self_Id, Time, Mode); |
| end if; |
| |
| end Timed_Delay_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_Machine_State_Addr := Get_Machine_State_Addr'Access; |
| SSL.Set_Machine_State_Addr := Set_Machine_State_Addr'Access; |
| SSL.Get_Current_Excep := Get_Current_Excep'Access; |
| SSL.Timed_Delay := Timed_Delay_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); |
| SSL.Set_Machine_State_Addr (SSL.Get_Machine_State_Addr_NT); |
| end if; |
| end Init_Tasking_Soft_Links; |
| |
| end System.Soft_Links.Tasking; |
