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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . T H R E A D S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1998-2005 AdaCore --
-- --
-- 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 Ada.Task_Identification; use Ada.Task_Identification;
with System.Task_Primitives.Operations;
with System.Tasking;
with System.Tasking.Stages; use System.Tasking.Stages;
with System.OS_Interface; use System.OS_Interface;
with System.Soft_Links; use System.Soft_Links;
with Unchecked_Conversion;
package body GNAT.Threads is
use System;
package STPO renames System.Task_Primitives.Operations;
type Thread_Id_Ptr is access all Thread_Id;
pragma Warnings (Off);
-- The following unchecked conversions are aliasing safe, since they
-- are never used to create pointers to improperly aliased data.
function To_Addr is new Unchecked_Conversion (Task_Id, Address);
function To_Id is new Unchecked_Conversion (Address, Task_Id);
function To_Id is new Unchecked_Conversion (Address, Tasking.Task_Id);
function To_Tid is new Unchecked_Conversion
(Address, Ada.Task_Identification.Task_Id);
function To_Thread is new Unchecked_Conversion (Address, Thread_Id_Ptr);
pragma Warnings (On);
type Code_Proc is access procedure (Id : Address; Parm : Void_Ptr);
task type Thread
(Stsz : Natural;
Prio : Any_Priority;
Parm : Void_Ptr;
Code : Code_Proc)
is
pragma Priority (Prio);
pragma Storage_Size (Stsz);
end Thread;
task body Thread is
begin
Code.all (To_Addr (Current_Task), Parm);
end Thread;
type Tptr is access Thread;
-------------------
-- Create_Thread --
-------------------
function Create_Thread
(Code : Address;
Parm : Void_Ptr;
Size : Natural;
Prio : Integer) return System.Address
is
TP : Tptr;
function To_CP is new Unchecked_Conversion (Address, Code_Proc);
begin
TP := new Thread (Size, Prio, Parm, To_CP (Code));
return To_Addr (TP'Identity);
end Create_Thread;
---------------------
-- Register_Thread --
---------------------
function Register_Thread return System.Address is
begin
return Task_Primitives.Operations.Register_Foreign_Thread.all'Address;
end Register_Thread;
-----------------------
-- Unregister_Thread --
-----------------------
procedure Unregister_Thread is
Self_Id : constant Tasking.Task_Id := Task_Primitives.Operations.Self;
begin
Self_Id.Common.State := Tasking.Terminated;
Destroy_TSD (Self_Id.Common.Compiler_Data);
Free_Task (Self_Id);
end Unregister_Thread;
--------------------------
-- Unregister_Thread_Id --
--------------------------
procedure Unregister_Thread_Id (Thread : System.Address) is
Thr : constant Thread_Id := To_Thread (Thread).all;
T : Tasking.Task_Id;
use type Tasking.Task_Id;
begin
STPO.Lock_RTS;
T := Tasking.All_Tasks_List;
loop
exit when T = null or else STPO.Get_Thread_Id (T) = Thr;
T := T.Common.All_Tasks_Link;
end loop;
STPO.Unlock_RTS;
if T /= null then
T.Common.State := Tasking.Terminated;
Destroy_TSD (T.Common.Compiler_Data);
Free_Task (T);
end if;
end Unregister_Thread_Id;
--------------------
-- Destroy_Thread --
--------------------
procedure Destroy_Thread (Id : Address) is
Tid : constant Task_Id := To_Id (Id);
begin
Abort_Task (Tid);
end Destroy_Thread;
----------------
-- Get_Thread --
----------------
procedure Get_Thread (Id : Address; Thread : Address) is
Thr : constant Thread_Id_Ptr := To_Thread (Thread);
begin
Thr.all := Task_Primitives.Operations.Get_Thread_Id (To_Id (Id));
end Get_Thread;
----------------
-- To_Task_Id --
----------------
function To_Task_Id
(Id : System.Address) return Ada.Task_Identification.Task_Id
is
begin
return To_Tid (Id);
end To_Task_Id;
end GNAT.Threads;
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