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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [g-thread.adb] - Blame information for rev 281

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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                         G N A T . T H R E A D S                          --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--                    Copyright (C) 1998-2007, AdaCore                      --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
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-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
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-- Boston, MA 02110-1301, USA.                                              --
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--                                                                          --
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-- As a special exception,  if other files  instantiate  generics from this --
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-- unit, or you link  this unit with other files  to produce an executable, --
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-- this  unit  does not  by itself cause  the resulting  executable  to  be --
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-- covered  by the  GNU  General  Public  License.  This exception does not --
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-- however invalidate  any other reasons why  the executable file  might be --
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-- covered by the  GNU Public License.                                      --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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with Ada.Task_Identification; use Ada.Task_Identification;
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with System.Task_Primitives.Operations;
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with System.Tasking;
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with System.Tasking.Stages;   use System.Tasking.Stages;
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with System.OS_Interface;     use System.OS_Interface;
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with System.Soft_Links;       use System.Soft_Links;
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with Ada.Unchecked_Conversion;
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package body GNAT.Threads is
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   use System;
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   package STPO renames System.Task_Primitives.Operations;
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   type Thread_Id_Ptr is access all Thread_Id;
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   pragma Warnings (Off);
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   --  The following unchecked conversions are aliasing safe, since they
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   --  are never used to create pointers to improperly aliased data.
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   function To_Addr is new Ada.Unchecked_Conversion (Task_Id, Address);
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   function To_Id   is new Ada.Unchecked_Conversion (Address, Task_Id);
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   function To_Id   is new Ada.Unchecked_Conversion (Address, Tasking.Task_Id);
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   function To_Tid  is new Ada.Unchecked_Conversion
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     (Address, Ada.Task_Identification.Task_Id);
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   function To_Thread is new Ada.Unchecked_Conversion (Address, Thread_Id_Ptr);
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   pragma Warnings (On);
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   type Code_Proc is access procedure (Id : Address; Parm : Void_Ptr);
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   task type Thread
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     (Stsz : Natural;
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      Prio : Any_Priority;
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      Parm : Void_Ptr;
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      Code : Code_Proc)
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   is
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      pragma Priority (Prio);
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      pragma Storage_Size (Stsz);
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   end Thread;
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   task body Thread is
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   begin
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      Code.all (To_Addr (Current_Task), Parm);
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   end Thread;
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   type Tptr is access Thread;
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   -------------------
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   -- Create_Thread --
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   -------------------
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   function Create_Thread
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     (Code : Address;
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      Parm : Void_Ptr;
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      Size : Natural;
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      Prio : Integer) return System.Address
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   is
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      TP : Tptr;
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      function To_CP is new Ada.Unchecked_Conversion (Address, Code_Proc);
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   begin
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      TP := new Thread (Size, Prio, Parm, To_CP (Code));
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      return To_Addr (TP'Identity);
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   end Create_Thread;
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   ---------------------
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   -- Register_Thread --
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   ---------------------
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   function Register_Thread return System.Address is
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   begin
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      return Task_Primitives.Operations.Register_Foreign_Thread.all'Address;
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   end Register_Thread;
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   -----------------------
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   -- Unregister_Thread --
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   -----------------------
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   procedure Unregister_Thread is
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      Self_Id : constant Tasking.Task_Id := Task_Primitives.Operations.Self;
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   begin
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      Self_Id.Common.State := Tasking.Terminated;
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      Destroy_TSD (Self_Id.Common.Compiler_Data);
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      Free_Task (Self_Id);
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   end Unregister_Thread;
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   --------------------------
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   -- Unregister_Thread_Id --
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   --------------------------
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   procedure Unregister_Thread_Id (Thread : System.Address) is
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      Thr : constant Thread_Id := To_Thread (Thread).all;
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      T   : Tasking.Task_Id;
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      use type Tasking.Task_Id;
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      --  This use clause should be removed once a visibility problem
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      --  with the MaRTE run time has been fixed. ???
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      pragma Warnings (Off);
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      use type System.OS_Interface.Thread_Id;
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      pragma Warnings (On);
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   begin
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      STPO.Lock_RTS;
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      T := Tasking.All_Tasks_List;
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      loop
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         exit when T = null or else STPO.Get_Thread_Id (T) = Thr;
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         T := T.Common.All_Tasks_Link;
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      end loop;
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      STPO.Unlock_RTS;
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      if T /= null then
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         T.Common.State := Tasking.Terminated;
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         Destroy_TSD (T.Common.Compiler_Data);
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         Free_Task (T);
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      end if;
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   end Unregister_Thread_Id;
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   --------------------
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   -- Destroy_Thread --
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   --------------------
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   procedure Destroy_Thread (Id : Address) is
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      Tid : constant Task_Id := To_Id (Id);
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   begin
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      Abort_Task (Tid);
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   end Destroy_Thread;
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   ----------------
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   -- Get_Thread --
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   ----------------
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   procedure Get_Thread (Id : Address; Thread : Address) is
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      Thr : constant Thread_Id_Ptr := To_Thread (Thread);
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   begin
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      Thr.all := Task_Primitives.Operations.Get_Thread_Id (To_Id (Id));
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   end Get_Thread;
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   ----------------
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   -- To_Task_Id --
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   ----------------
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   function To_Task_Id
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     (Id : System.Address) return Ada.Task_Identification.Task_Id
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   is
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   begin
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      return To_Tid (Id);
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   end To_Task_Id;
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end GNAT.Threads;

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