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) 1992-2002 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,  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
  34 with System.Address_Image;
  35 --  used for the function itself
  36
  37 with System.Tasking;
  38 --  used for Task_List
  39
  40 with System.Tasking.Stages;
  41 --  used for Terminated
  42 --           Abort_Tasks
  43
  44 with System.Tasking.Rendezvous;
  45 --  used for Callable
  46
  47 with System.Task_Primitives.Operations;
  48 --  used for Self
  49
  50 with Unchecked_Conversion;
  51
  52 package body Ada.Task_Identification is
  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.Stages.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         Unchecked_Conversion (Task_Id, System.Address);
 116
 117    begin
 118       if T = Null_Task_Id then
 119          return "";
 120
 121       elsif T.Common.Task_Image_Len = 0 then
 122          return System.Address_Image (To_Address (T));
 123
 124       else
 125          return T.Common.Task_Image (1 .. T.Common.Task_Image_Len)
 126             & "_" &  System.Address_Image (To_Address (T));
 127       end if;
 128    end Image;
 129
 130    -----------------
 131    -- Is_Callable --
 132    -----------------
 133
 134    function Is_Callable (T : Task_Id) return Boolean is
 135    begin
 136       if T = Null_Task_Id then
 137          raise Program_Error;
 138       else
 139          return System.Tasking.Rendezvous.Callable (Convert_Ids (T));
 140       end if;
 141    end Is_Callable;
 142
 143    -------------------
 144    -- Is_Terminated --
 145    -------------------
 146
 147    function Is_Terminated (T : Task_Id) return Boolean is
 148    begin
 149       if T = Null_Task_Id then
 150          raise Program_Error;
 151       else
 152          return System.Tasking.Stages.Terminated (Convert_Ids (T));
 153       end if;
 154    end Is_Terminated;
 155
 156 end Ada.Task_Identification;