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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . T A S K _ I D E N T I F I C A T I O N --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2007, Free Software Foundation, 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, 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 ------------------------------------------------------------------------------
34 with System.Address_Image;
35 with System.Parameters;
36 with System.Soft_Links;
37 with System.Task_Primitives.Operations;
38 with Ada.Unchecked_Conversion;
40 pragma Warnings (Off);
41 -- Allow withing of non-Preelaborated units in Ada 2005 mode where this
42 -- package will be categorized as Preelaborate. See AI-362 for details.
43 -- It is safe in the context of the run-time to violate the rules!
45 with System.Tasking.Utilities;
46 -- Used for Abort_Tasks
48 pragma Warnings (On);
50 package body Ada.Task_Identification is
52 use System.Parameters;
54 package STPO renames System.Task_Primitives.Operations;
56 -----------------------
57 -- Local Subprograms --
58 -----------------------
60 function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id;
61 function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id;
62 pragma Inline (Convert_Ids);
63 -- Conversion functions between different forms of Task_Id
65 ---------
66 -- "=" --
67 ---------
69 function "=" (Left, Right : Task_Id) return Boolean is
70 begin
71 return System.Tasking."=" (Convert_Ids (Left), Convert_Ids (Right));
72 end "=";
74 -----------------
75 -- Abort_Task --
76 ----------------
78 procedure Abort_Task (T : Task_Id) is
79 begin
80 if T = Null_Task_Id then
81 raise Program_Error;
82 else
83 System.Tasking.Utilities.Abort_Tasks
84 (System.Tasking.Task_List'(1 => Convert_Ids (T)));
85 end if;
86 end Abort_Task;
88 -----------------
89 -- Convert_Ids --
90 -----------------
92 function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id is
93 begin
94 return System.Tasking.Task_Id (T);
95 end Convert_Ids;
97 function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id is
98 begin
99 return Task_Id (T);
100 end Convert_Ids;
102 ------------------
103 -- Current_Task --
104 ------------------
106 function Current_Task return Task_Id is
107 begin
108 return Convert_Ids (System.Task_Primitives.Operations.Self);
109 end Current_Task;
111 -----------
112 -- Image --
113 -----------
115 function Image (T : Task_Id) return String is
116 function To_Address is new
117 Ada.Unchecked_Conversion (Task_Id, System.Address);
119 begin
120 if T = Null_Task_Id then
121 return "";
123 elsif T.Common.Task_Image_Len = 0 then
124 return System.Address_Image (To_Address (T));
126 else
127 return T.Common.Task_Image (1 .. T.Common.Task_Image_Len)
128 & "_" & System.Address_Image (To_Address (T));
129 end if;
130 end Image;
132 -----------------
133 -- Is_Callable --
134 -----------------
136 function Is_Callable (T : Task_Id) return Boolean is
137 Result : Boolean;
138 Id : constant System.Tasking.Task_Id := Convert_Ids (T);
139 begin
140 if T = Null_Task_Id then
141 raise Program_Error;
142 else
143 System.Soft_Links.Abort_Defer.all;
145 if Single_Lock then
146 STPO.Lock_RTS;
147 end if;
149 STPO.Write_Lock (Id);
150 Result := Id.Callable;
151 STPO.Unlock (Id);
153 if Single_Lock then
154 STPO.Unlock_RTS;
155 end if;
157 System.Soft_Links.Abort_Undefer.all;
158 return Result;
159 end if;
160 end Is_Callable;
162 -------------------
163 -- Is_Terminated --
164 -------------------
166 function Is_Terminated (T : Task_Id) return Boolean is
167 Result : Boolean;
168 Id : constant System.Tasking.Task_Id := Convert_Ids (T);
170 use System.Tasking;
172 begin
173 if T = Null_Task_Id then
174 raise Program_Error;
175 else
176 System.Soft_Links.Abort_Defer.all;
178 if Single_Lock then
179 STPO.Lock_RTS;
180 end if;
182 STPO.Write_Lock (Id);
183 Result := Id.Common.State = Terminated;
184 STPO.Unlock (Id);
186 if Single_Lock then
187 STPO.Unlock_RTS;
188 end if;
190 System.Soft_Links.Abort_Undefer.all;
191 return Result;
192 end if;
193 end Is_Terminated;
195 end Ada.Task_Identification;