1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . T A S K _ T E R M I N A T I O N --
9 -- Copyright (C) 2005-2008, Free Software Foundation, Inc. --
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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
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. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
35 with System.Task_Primitives.Operations;
36 with System.Parameters;
37 with System.Soft_Links;
39 with Ada.Unchecked_Conversion;
41 package body Ada.Task_Termination is
43 use type Ada.Task_Identification.Task_Id;
45 package STPO renames System.Task_Primitives.Operations;
46 package SSL renames System.Soft_Links;
48 use System.Parameters;
50 -----------------------
51 -- Local subprograms --
52 -----------------------
54 function To_TT is new Ada.Unchecked_Conversion
55 (System.Tasking.Termination_Handler, Termination_Handler);
57 function To_ST is new Ada.Unchecked_Conversion
58 (Termination_Handler, System.Tasking.Termination_Handler);
60 function To_Task_Id is new Ada.Unchecked_Conversion
61 (Ada.Task_Identification.Task_Id, System.Tasking.Task_Id);
63 -----------------------------------
64 -- Current_Task_Fallback_Handler --
65 -----------------------------------
67 function Current_Task_Fallback_Handler return Termination_Handler is
69 -- There is no need for explicit protection against race conditions
70 -- for this function because this function can only be executed by
71 -- Self, and the Fall_Back_Handler can only be modified by Self.
73 return To_TT (STPO.Self.Common.Fall_Back_Handler);
74 end Current_Task_Fallback_Handler;
76 -------------------------------------
77 -- Set_Dependents_Fallback_Handler --
78 -------------------------------------
80 procedure Set_Dependents_Fallback_Handler
81 (Handler : Termination_Handler)
83 Self : constant System.Tasking.Task_Id := STPO.Self;
92 STPO.Write_Lock (Self);
94 Self.Common.Fall_Back_Handler := To_ST (Handler);
102 SSL.Abort_Undefer.all;
103 end Set_Dependents_Fallback_Handler;
105 --------------------------
106 -- Set_Specific_Handler --
107 --------------------------
109 procedure Set_Specific_Handler
110 (T : Ada.Task_Identification.Task_Id;
111 Handler : Termination_Handler)
114 -- Tasking_Error is raised if the task identified by T has already
115 -- terminated. Program_Error is raised if the value of T is
118 if T = Ada.Task_Identification.Null_Task_Id then
120 elsif Ada.Task_Identification.Is_Terminated (T) then
124 Target : constant System.Tasking.Task_Id := To_Task_Id (T);
133 STPO.Write_Lock (Target);
135 Target.Common.Specific_Handler := To_ST (Handler);
137 STPO.Unlock (Target);
143 SSL.Abort_Undefer.all;
146 end Set_Specific_Handler;
148 ----------------------
149 -- Specific_Handler --
150 ----------------------
152 function Specific_Handler
153 (T : Ada.Task_Identification.Task_Id) return Termination_Handler
156 -- Tasking_Error is raised if the task identified by T has already
157 -- terminated. Program_Error is raised if the value of T is
160 if T = Ada.Task_Identification.Null_Task_Id then
162 elsif Ada.Task_Identification.Is_Terminated (T) then
166 Target : constant System.Tasking.Task_Id := To_Task_Id (T);
167 TH : Termination_Handler;
176 STPO.Write_Lock (Target);
178 TH := To_TT (Target.Common.Specific_Handler);
180 STPO.Unlock (Target);
186 SSL.Abort_Undefer.all;
191 end Specific_Handler;
193 end Ada.Task_Termination;