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) 1992-2005 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 ------------------------------------------------------------------------------
  33
  34 pragma Warnings (Off);
  35 --  Allow withing of non-Preelaborated units in Ada 2005 mode where this
  36 --  package will be categorized as Preelaborate. See AI-362 for details.
  37 --  It is safe in the context of the run-time to violate the rules!
  38
  39 with System.Address_Image;
  40 --  used for the function itself
  41
  42 with System.Tasking;
  43 --  used for Task_List
  44
  45 with System.Tasking.Stages;
  46 --  used for Terminated
  47 --           Abort_Tasks
  48
  49 with System.Tasking.Rendezvous;
  50 --  used for Callable
  51
  52 with System.Task_Primitives.Operations;
  53 --  used for Self
  54
  55 with Unchecked_Conversion;
  56
  57 pragma Warnings (Off);
  58
  59 package body Ada.Task_Identification is
  60
  61    -----------------------
  62    -- Local Subprograms --
  63    -----------------------
  64
  65    function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id;
  66    function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id;
  67    pragma Inline (Convert_Ids);
  68    --  Conversion functions between different forms of Task_Id
  69
  70    ---------
  71    -- "=" --
  72    ---------
  73
  74    function  "=" (Left, Right : Task_Id) return Boolean is
  75    begin
  76       return System.Tasking."=" (Convert_Ids (Left), Convert_Ids (Right));
  77    end "=";
  78
  79    -----------------
  80    -- Abort_Task --
  81    ----------------
  82
  83    procedure Abort_Task (T : Task_Id) is
  84    begin
  85       if T = Null_Task_Id then
  86          raise Program_Error;
  87       else
  88          System.Tasking.Stages.Abort_Tasks
  89            (System.Tasking.Task_List'(1 => Convert_Ids (T)));
  90       end if;
  91    end Abort_Task;
  92
  93    -----------------
  94    -- Convert_Ids --
  95    -----------------
  96
  97    function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id is
  98    begin
  99       return System.Tasking.Task_Id (T);
 100    end Convert_Ids;
 101
 102    function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id is
 103    begin
 104       return Task_Id (T);
 105    end Convert_Ids;
 106
 107    ------------------
 108    -- Current_Task --
 109    ------------------
 110
 111    function Current_Task return Task_Id is
 112    begin
 113       return Convert_Ids (System.Task_Primitives.Operations.Self);
 114    end Current_Task;
 115
 116    -----------
 117    -- Image --
 118    -----------
 119
 120    function Image (T : Task_Id) return String is
 121       function To_Address is new
 122         Unchecked_Conversion (Task_Id, System.Address);
 123
 124    begin
 125       if T = Null_Task_Id then
 126          return "";
 127
 128       elsif T.Common.Task_Image_Len = 0 then
 129          return System.Address_Image (To_Address (T));
 130
 131       else
 132          return T.Common.Task_Image (1 .. T.Common.Task_Image_Len)
 133             & "_" &  System.Address_Image (To_Address (T));
 134       end if;
 135    end Image;
 136
 137    -----------------
 138    -- Is_Callable --
 139    -----------------
 140
 141    function Is_Callable (T : Task_Id) return Boolean is
 142    begin
 143       if T = Null_Task_Id then
 144          raise Program_Error;
 145       else
 146          return System.Tasking.Rendezvous.Callable (Convert_Ids (T));
 147       end if;
 148    end Is_Callable;
 149
 150    -------------------
 151    -- Is_Terminated --
 152    -------------------
 153
 154    function Is_Terminated (T : Task_Id) return Boolean is
 155    begin
 156       if T = Null_Task_Id then
 157          raise Program_Error;
 158       else
 159          return System.Tasking.Stages.Terminated (Convert_Ids (T));
 160       end if;
 161    end Is_Terminated;
 162
 163 end Ada.Task_Identification;