1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUNTIME COMPONENTS                          --
4--                                                                          --
5--                         G N A T . T H R E A D S                          --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--            Copyright (C) 1998-2003 Ada Core Technologies, Inc.           --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
19-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
20-- MA 02111-1307, USA.                                                      --
21--                                                                          --
22-- As a special exception,  if other files  instantiate  generics from this --
23-- unit, or you link  this unit with other files  to produce an executable, --
24-- this  unit  does not  by itself cause  the resulting  executable  to  be --
25-- covered  by the  GNU  General  Public  License.  This exception does not --
26-- however invalidate  any other reasons why  the executable file  might be --
27-- covered by the  GNU Public License.                                      --
28--                                                                          --
29-- GNAT was originally developed  by the GNAT team at  New York University. --
30-- Extensive contributions were provided by Ada Core Technologies Inc.      --
31--                                                                          --
32------------------------------------------------------------------------------
33
34with Ada.Task_Identification; use Ada.Task_Identification;
35with System.Task_Primitives.Operations;
36with System.Tasking;
37with System.Tasking.Stages;   use System.Tasking.Stages;
38with System.OS_Interface;     use System.OS_Interface;
39with System.Soft_Links;       use System.Soft_Links;
40with Unchecked_Conversion;
41
42package body GNAT.Threads is
43
44   use System;
45
46   package STPO renames System.Task_Primitives.Operations;
47
48   type Thread_Id_Ptr is access all Thread_Id;
49
50   function To_Addr is new Unchecked_Conversion (Task_Id, Address);
51   function To_Id   is new Unchecked_Conversion (Address, Task_Id);
52   function To_Id   is new Unchecked_Conversion (Address, Tasking.Task_ID);
53   function To_Tid  is new Unchecked_Conversion
54     (Address, Ada.Task_Identification.Task_Id);
55   function To_Thread is new Unchecked_Conversion (Address, Thread_Id_Ptr);
56
57   type Code_Proc is access procedure (Id : Address; Parm : Void_Ptr);
58
59   task type Thread
60     (Stsz : Natural;
61      Prio : Any_Priority;
62      Parm : Void_Ptr;
63      Code : Code_Proc)
64   is
65      pragma Priority (Prio);
66      pragma Storage_Size (Stsz);
67   end Thread;
68
69   task body Thread is
70   begin
71      Code.all (To_Addr (Current_Task), Parm);
72   end Thread;
73
74   type Tptr is access Thread;
75
76   -------------------
77   -- Create_Thread --
78   -------------------
79
80   function Create_Thread
81     (Code : Address;
82      Parm : Void_Ptr;
83      Size : Natural;
84      Prio : Integer) return System.Address
85   is
86      TP : Tptr;
87
88      function To_CP is new Unchecked_Conversion (Address, Code_Proc);
89
90   begin
91      TP := new Thread (Size, Prio, Parm, To_CP (Code));
92      return To_Addr (TP'Identity);
93   end Create_Thread;
94
95   ---------------------
96   -- Register_Thread --
97   ---------------------
98
99   function Register_Thread return System.Address is
100   begin
101      return Task_Primitives.Operations.Register_Foreign_Thread.all'Address;
102   end Register_Thread;
103
104   -----------------------
105   -- Unregister_Thread --
106   -----------------------
107
108   procedure Unregister_Thread is
109      Self_Id : constant Tasking.Task_ID := Task_Primitives.Operations.Self;
110   begin
111      Self_Id.Common.State := Tasking.Terminated;
112      Destroy_TSD (Self_Id.Common.Compiler_Data);
113      Free_Task (Self_Id);
114   end Unregister_Thread;
115
116   --------------------------
117   -- Unregister_Thread_Id --
118   --------------------------
119
120   procedure Unregister_Thread_Id (Thread : System.Address) is
121      Thr : constant Thread_Id := To_Thread (Thread).all;
122      T   : Tasking.Task_ID;
123
124      use type Tasking.Task_ID;
125
126   begin
127      STPO.Lock_RTS;
128
129      T := Tasking.All_Tasks_List;
130      loop
131         exit when T = null or else STPO.Get_Thread_Id (T) = Thr;
132
133         T := T.Common.All_Tasks_Link;
134      end loop;
135
136      STPO.Unlock_RTS;
137
138      if T /= null then
139         T.Common.State := Tasking.Terminated;
140         Destroy_TSD (T.Common.Compiler_Data);
141         Free_Task (T);
142      end if;
143   end Unregister_Thread_Id;
144
145   --------------------
146   -- Destroy_Thread --
147   --------------------
148
149   procedure Destroy_Thread (Id : Address) is
150      Tid : constant Task_Id := To_Id (Id);
151   begin
152      Abort_Task (Tid);
153   end Destroy_Thread;
154
155   ----------------
156   -- Get_Thread --
157   ----------------
158
159   procedure Get_Thread (Id : Address; Thread : Address) is
160      use System.OS_Interface;
161      Thr : constant Thread_Id_Ptr := To_Thread (Thread);
162   begin
163      Thr.all := Task_Primitives.Operations.Get_Thread_Id (To_Id (Id));
164   end Get_Thread;
165
166   ----------------
167   -- To_Task_Id --
168   ----------------
169
170   function To_Task_Id
171     (Id   : System.Address) return Ada.Task_Identification.Task_Id
172   is
173   begin
174      return To_Tid (Id);
175   end To_Task_Id;
176
177end GNAT.Threads;
178