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) 1992-2001 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 System.Task_Info;
  51 use type System.Task_Info.Task_Image_Type;
  52
  53 with Unchecked_Conversion;
  54
  55 package body Ada.Task_Identification is
  56
  57    -----------------------
  58    -- Local Subprograms --
  59    -----------------------
  60
  61    function Convert_Ids (T : Task_Id) return System.Tasking.Task_ID;
  62    function Convert_Ids (T : System.Tasking.Task_ID) return Task_Id;
  63    pragma Inline (Convert_Ids);
  64    --  Conversion functions between different forms of Task_Id
  65
  66    ---------
  67    -- "=" --
  68    ---------
  69
  70    function  "=" (Left, Right : Task_Id) return Boolean is
  71    begin
  72       return System.Tasking."=" (Convert_Ids (Left), Convert_Ids (Right));
  73    end "=";
  74
  75    -----------------
  76    -- Abort_Task --
  77    ----------------
  78
  79    procedure Abort_Task (T : Task_Id) is
  80    begin
  81       if T = Null_Task_Id then
  82          raise Program_Error;
  83       else
  84          System.Tasking.Stages.Abort_Tasks
  85            (System.Tasking.Task_List'(1 => Convert_Ids (T)));
  86       end if;
  87    end Abort_Task;
  88
  89    -----------------
  90    -- Convert_Ids --
  91    -----------------
  92
  93    function Convert_Ids (T : Task_Id) return System.Tasking.Task_ID is
  94    begin
  95       return System.Tasking.Task_ID (T);
  96    end Convert_Ids;
  97
  98    function Convert_Ids (T : System.Tasking.Task_ID) return Task_Id is
  99    begin
 100       return Task_Id (T);
 101    end Convert_Ids;
 102
 103    ------------------
 104    -- Current_Task --
 105    ------------------
 106
 107    function Current_Task return Task_Id is
 108    begin
 109       return Convert_Ids (System.Task_Primitives.Operations.Self);
 110    end Current_Task;
 111
 112    -----------
 113    -- Image --
 114    -----------
 115
 116    function Image (T : Task_Id) return String is
 117       use System.Task_Info;
 118       function To_Address is new
 119         Unchecked_Conversion (Task_Id, System.Address);
 120
 121    begin
 122       if T = Null_Task_Id then
 123          return "";
 124
 125       elsif T.Common.Task_Image = null then
 126          return System.Address_Image (To_Address (T));
 127
 128       else
 129          return T.Common.Task_Image.all
 130             & "_" &  System.Address_Image (To_Address (T));
 131       end if;
 132    end Image;
 133
 134    -----------------
 135    -- Is_Callable --
 136    -----------------
 137
 138    function Is_Callable (T : Task_Id) return Boolean is
 139    begin
 140       if T = Null_Task_Id then
 141          raise Program_Error;
 142       else
 143          return System.Tasking.Rendezvous.Callable (Convert_Ids (T));
 144       end if;
 145    end Is_Callable;
 146
 147    -------------------
 148    -- Is_Terminated --
 149    -------------------
 150
 151    function Is_Terminated (T : Task_Id) return Boolean is
 152    begin
 153       if T = Null_Task_Id then
 154          raise Program_Error;
 155       else
 156          return System.Tasking.Stages.Terminated (Convert_Ids (T));
 157       end if;
 158    end Is_Terminated;
 159
 160 end Ada.Task_Identification;