gcc/ada/a-taside.adb

   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) 1992-2009, 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 with System.Address_Image;
  33 with System.Parameters;
  34 with System.Soft_Links;
  35 with System.Task_Primitives;
  36 with System.Task_Primitives.Operations;
  37 with Ada.Unchecked_Conversion;
  38
  39 pragma Warnings (Off);
  40 --  Allow withing of non-Preelaborated units in Ada 2005 mode where this
  41 --  package will be categorized as Preelaborate. See AI-362 for details.
  42 --  It is safe in the context of the run-time to violate the rules!
  43
  44 with System.Tasking.Utilities;
  45
  46 pragma Warnings (On);
  47
  48 package body Ada.Task_Identification is
  49
  50    use System.Parameters;
  51
  52    package STPO renames System.Task_Primitives.Operations;
  53
  54    -----------------------
  55    -- Local Subprograms --
  56    -----------------------
  57
  58    function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id;
  59    function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id;
  60    pragma Inline (Convert_Ids);
  61    --  Conversion functions between different forms of Task_Id
  62
  63    ---------
  64    -- "=" --
  65    ---------
  66
  67    function "=" (Left, Right : Task_Id) return Boolean is
  68    begin
  69       return System.Tasking."=" (Convert_Ids (Left), Convert_Ids (Right));
  70    end "=";
  71
  72    -----------------
  73    -- Abort_Task --
  74    ----------------
  75
  76    procedure Abort_Task (T : Task_Id) is
  77    begin
  78       if T = Null_Task_Id then
  79          raise Program_Error;
  80       else
  81          System.Tasking.Utilities.Abort_Tasks
  82            (System.Tasking.Task_List'(1 => Convert_Ids (T)));
  83       end if;
  84    end Abort_Task;
  85
  86    -----------------
  87    -- Convert_Ids --
  88    -----------------
  89
  90    function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id is
  91    begin
  92       return System.Tasking.Task_Id (T);
  93    end Convert_Ids;
  94
  95    function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id is
  96    begin
  97       return Task_Id (T);
  98    end Convert_Ids;
  99
 100    ------------------
 101    -- Current_Task --
 102    ------------------
 103
 104    function Current_Task return Task_Id is
 105    begin
 106       return Convert_Ids (System.Task_Primitives.Operations.Self);
 107    end Current_Task;
 108
 109    -----------
 110    -- Image --
 111    -----------
 112
 113    function Image (T : Task_Id) return String is
 114       function To_Address is new
 115         Ada.Unchecked_Conversion
 116           (Task_Id, System.Task_Primitives.Task_Address);
 117
 118    begin
 119       if T = Null_Task_Id then
 120          return "";
 121
 122       elsif T.Common.Task_Image_Len = 0 then
 123          return System.Address_Image (To_Address (T));
 124
 125       else
 126          return T.Common.Task_Image (1 .. T.Common.Task_Image_Len)
 127             & "_" &  System.Address_Image (To_Address (T));
 128       end if;
 129    end Image;
 130
 131    -----------------
 132    -- Is_Callable --
 133    -----------------
 134
 135    function Is_Callable (T : Task_Id) return Boolean is
 136       Result : Boolean;
 137       Id     : constant System.Tasking.Task_Id := Convert_Ids (T);
 138    begin
 139       if T = Null_Task_Id then
 140          raise Program_Error;
 141       else
 142          System.Soft_Links.Abort_Defer.all;
 143
 144          if Single_Lock then
 145             STPO.Lock_RTS;
 146          end if;
 147
 148          STPO.Write_Lock (Id);
 149          Result := Id.Callable;
 150          STPO.Unlock (Id);
 151
 152          if Single_Lock then
 153             STPO.Unlock_RTS;
 154          end if;
 155
 156          System.Soft_Links.Abort_Undefer.all;
 157          return Result;
 158       end if;
 159    end Is_Callable;
 160
 161    -------------------
 162    -- Is_Terminated --
 163    -------------------
 164
 165    function Is_Terminated (T : Task_Id) return Boolean is
 166       Result : Boolean;
 167       Id     : constant System.Tasking.Task_Id := Convert_Ids (T);
 168
 169       use System.Tasking;
 170
 171    begin
 172       if T = Null_Task_Id then
 173          raise Program_Error;
 174       else
 175          System.Soft_Links.Abort_Defer.all;
 176
 177          if Single_Lock then
 178             STPO.Lock_RTS;
 179          end if;
 180
 181          STPO.Write_Lock (Id);
 182          Result := Id.Common.State = Terminated;
 183          STPO.Unlock (Id);
 184
 185          if Single_Lock then
 186             STPO.Unlock_RTS;
 187          end if;
 188
 189          System.Soft_Links.Abort_Undefer.all;
 190          return Result;
 191       end if;
 192    end Is_Terminated;
 193
 194 end Ada.Task_Identification;