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) 2005-2007, 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 ------------------------------------------------------------------------------
37 with System.Task_Primitives.Operations;
44 with System.Parameters;
45 -- used for Single_Lock
47 with System.Soft_Links;
48 -- use for Abort_Defer
51 with Ada.Unchecked_Conversion;
53 package body Ada.Task_Termination is
55 use type Ada.Task_Identification.Task_Id;
57 package STPO renames System.Task_Primitives.Operations;
58 package SSL renames System.Soft_Links;
60 use System.Parameters;
62 -----------------------
63 -- Local subprograms --
64 -----------------------
66 function To_TT is new Ada.Unchecked_Conversion
67 (System.Tasking.Termination_Handler, Termination_Handler);
69 function To_ST is new Ada.Unchecked_Conversion
70 (Termination_Handler, System.Tasking.Termination_Handler);
72 function To_Task_Id is new Ada.Unchecked_Conversion
73 (Ada.Task_Identification.Task_Id, System.Tasking.Task_Id);
75 -----------------------------------
76 -- Current_Task_Fallback_Handler --
77 -----------------------------------
79 function Current_Task_Fallback_Handler return Termination_Handler is
81 -- There is no need for explicit protection against race conditions
82 -- for this function because this function can only be executed by
83 -- Self, and the Fall_Back_Handler can only be modified by Self.
85 return To_TT (STPO.Self.Common.Fall_Back_Handler);
86 end Current_Task_Fallback_Handler;
88 -------------------------------------
89 -- Set_Dependents_Fallback_Handler --
90 -------------------------------------
92 procedure Set_Dependents_Fallback_Handler
93 (Handler : Termination_Handler)
95 Self : constant System.Tasking.Task_Id := STPO.Self;
104 STPO.Write_Lock (Self);
106 Self.Common.Fall_Back_Handler := To_ST (Handler);
114 SSL.Abort_Undefer.all;
115 end Set_Dependents_Fallback_Handler;
117 --------------------------
118 -- Set_Specific_Handler --
119 --------------------------
121 procedure Set_Specific_Handler
122 (T : Ada.Task_Identification.Task_Id;
123 Handler : Termination_Handler)
126 -- Tasking_Error is raised if the task identified by T has already
127 -- terminated. Program_Error is raised if the value of T is
130 if T = Ada.Task_Identification.Null_Task_Id then
132 elsif Ada.Task_Identification.Is_Terminated (T) then
136 Target : constant System.Tasking.Task_Id := To_Task_Id (T);
145 STPO.Write_Lock (Target);
147 Target.Common.Specific_Handler := To_ST (Handler);
149 STPO.Unlock (Target);
155 SSL.Abort_Undefer.all;
158 end Set_Specific_Handler;
160 ----------------------
161 -- Specific_Handler --
162 ----------------------
164 function Specific_Handler
165 (T : Ada.Task_Identification.Task_Id) return Termination_Handler
168 -- Tasking_Error is raised if the task identified by T has already
169 -- terminated. Program_Error is raised if the value of T is
172 if T = Ada.Task_Identification.Null_Task_Id then
174 elsif Ada.Task_Identification.Is_Terminated (T) then
178 Target : constant System.Tasking.Task_Id := To_Task_Id (T);
179 TH : Termination_Handler;
188 STPO.Write_Lock (Target);
190 TH := To_TT (Target.Common.Specific_Handler);
192 STPO.Unlock (Target);
198 SSL.Abort_Undefer.all;
203 end Specific_Handler;
205 end Ada.Task_Termination;