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 --                                                                          --
  10 --           Copyright (C) 1992-2001 Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with System.Address_Image;
  36 --  used for the function itself
  37
  38 with System.Tasking;
  39 --  used for Task_List
  40
  41 with System.Tasking.Stages;
  42 --  used for Terminated
  43 --           Abort_Tasks
  44
  45 with System.Tasking.Rendezvous;
  46 --  used for Callable
  47
  48 with System.Task_Primitives.Operations;
  49 --  used for Self
  50
  51 with System.Task_Info;
  52 use type System.Task_Info.Task_Image_Type;
  53
  54 with Unchecked_Conversion;
  55
  56 package body Ada.Task_Identification is
  57
  58    -----------------------
  59    -- Local Subprograms --
  60    -----------------------
  61
  62    function Convert_Ids (T : Task_Id) return System.Tasking.Task_ID;
  63    function Convert_Ids (T : System.Tasking.Task_ID) return Task_Id;
  64    pragma Inline (Convert_Ids);
  65    --  Conversion functions between different forms of Task_Id
  66
  67    ---------
  68    -- "=" --
  69    ---------
  70
  71    function  "=" (Left, Right : Task_Id) return Boolean is
  72    begin
  73       return System.Tasking."=" (Convert_Ids (Left), Convert_Ids (Right));
  74    end "=";
  75
  76    -----------------
  77    -- Abort_Task --
  78    ----------------
  79
  80    procedure Abort_Task (T : Task_Id) is
  81    begin
  82       if T = Null_Task_Id then
  83          raise Program_Error;
  84       else
  85          System.Tasking.Stages.Abort_Tasks
  86            (System.Tasking.Task_List'(1 => Convert_Ids (T)));
  87       end if;
  88    end Abort_Task;
  89
  90    -----------------
  91    -- Convert_Ids --
  92    -----------------
  93
  94    function Convert_Ids (T : Task_Id) return System.Tasking.Task_ID is
  95    begin
  96       return System.Tasking.Task_ID (T);
  97    end Convert_Ids;
  98
  99    function Convert_Ids (T : System.Tasking.Task_ID) return Task_Id is
 100    begin
 101       return Task_Id (T);
 102    end Convert_Ids;
 103
 104    ------------------
 105    -- Current_Task --
 106    ------------------
 107
 108    function Current_Task return Task_Id is
 109    begin
 110       return Convert_Ids (System.Task_Primitives.Operations.Self);
 111    end Current_Task;
 112
 113    -----------
 114    -- Image --
 115    -----------
 116
 117    function Image (T : Task_Id) return String is
 118       use System.Task_Info;
 119       function To_Address is new
 120         Unchecked_Conversion (Task_Id, System.Address);
 121
 122    begin
 123       if T = Null_Task_Id then
 124          return "";
 125
 126       elsif T.Common.Task_Image = null then
 127          return System.Address_Image (To_Address (T));
 128
 129       else
 130          return T.Common.Task_Image.all
 131             & "_" &  System.Address_Image (To_Address (T));
 132       end if;
 133    end Image;
 134
 135    -----------------
 136    -- Is_Callable --
 137    -----------------
 138
 139    function Is_Callable (T : Task_Id) return Boolean is
 140    begin
 141       if T = Null_Task_Id then
 142          raise Program_Error;
 143       else
 144          return System.Tasking.Rendezvous.Callable (Convert_Ids (T));
 145       end if;
 146    end Is_Callable;
 147
 148    -------------------
 149    -- Is_Terminated --
 150    -------------------
 151
 152    function Is_Terminated (T : Task_Id) return Boolean is
 153    begin
 154       if T = Null_Task_Id then
 155          raise Program_Error;
 156       else
 157          return System.Tasking.Stages.Terminated (Convert_Ids (T));
 158       end if;
 159    end Is_Terminated;
 160
 161 end Ada.Task_Identification;