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) 1992-2013, 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 with
  49   SPARK_Mode => Off
  50 is
  51
  52    use System.Parameters;
  53
  54    package STPO renames System.Task_Primitives.Operations;
  55
  56    -----------------------
  57    -- Local Subprograms --
  58    -----------------------
  59
  60    function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id;
  61    function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id;
  62    pragma Inline (Convert_Ids);
  63    --  Conversion functions between different forms of Task_Id
  64
  65    ---------
  66    -- "=" --
  67    ---------
  68
  69    function "=" (Left, Right : Task_Id) return Boolean is
  70    begin
  71       return System.Tasking."=" (Convert_Ids (Left), Convert_Ids (Right));
  72    end "=";
  73
  74    -----------------
  75    -- Abort_Task --
  76    ----------------
  77
  78    procedure Abort_Task (T : Task_Id) is
  79    begin
  80       if T = Null_Task_Id then
  81          raise Program_Error;
  82       else
  83          System.Tasking.Utilities.Abort_Tasks
  84            (System.Tasking.Task_List'(1 => Convert_Ids (T)));
  85       end if;
  86    end Abort_Task;
  87
  88    ----------------------------
  89    -- Activation_Is_Complete --
  90    ----------------------------
  91
  92    function Activation_Is_Complete (T : Task_Id) return Boolean is
  93       use type System.Tasking.Task_Id;
  94    begin
  95       return Convert_Ids (T).Common.Activator = null;
  96    end Activation_Is_Complete;
  97
  98    -----------------
  99    -- Convert_Ids --
 100    -----------------
 101
 102    function Convert_Ids (T : Task_Id) return System.Tasking.Task_Id is
 103    begin
 104       return System.Tasking.Task_Id (T);
 105    end Convert_Ids;
 106
 107    function Convert_Ids (T : System.Tasking.Task_Id) return Task_Id is
 108    begin
 109       return Task_Id (T);
 110    end Convert_Ids;
 111
 112    ------------------
 113    -- Current_Task --
 114    ------------------
 115
 116    function Current_Task return Task_Id is
 117    begin
 118       return Convert_Ids (System.Task_Primitives.Operations.Self);
 119    end Current_Task;
 120
 121    ----------------------
 122    -- Environment_Task --
 123    ----------------------
 124
 125    function Environment_Task return Task_Id is
 126    begin
 127       return Convert_Ids (System.Task_Primitives.Operations.Environment_Task);
 128    end Environment_Task;
 129
 130    -----------
 131    -- Image --
 132    -----------
 133
 134    function Image (T : Task_Id) return String is
 135       function To_Address is new
 136         Ada.Unchecked_Conversion
 137           (Task_Id, System.Task_Primitives.Task_Address);
 138
 139    begin
 140       if T = Null_Task_Id then
 141          return "";
 142
 143       elsif T.Common.Task_Image_Len = 0 then
 144          return System.Address_Image (To_Address (T));
 145
 146       else
 147          return T.Common.Task_Image (1 .. T.Common.Task_Image_Len)
 148             & "_" &  System.Address_Image (To_Address (T));
 149       end if;
 150    end Image;
 151
 152    -----------------
 153    -- Is_Callable --
 154    -----------------
 155
 156    function Is_Callable (T : Task_Id) return Boolean is
 157       Result : Boolean;
 158       Id     : constant System.Tasking.Task_Id := Convert_Ids (T);
 159    begin
 160       if T = Null_Task_Id then
 161          raise Program_Error;
 162       else
 163          System.Soft_Links.Abort_Defer.all;
 164
 165          if Single_Lock then
 166             STPO.Lock_RTS;
 167          end if;
 168
 169          STPO.Write_Lock (Id);
 170          Result := Id.Callable;
 171          STPO.Unlock (Id);
 172
 173          if Single_Lock then
 174             STPO.Unlock_RTS;
 175          end if;
 176
 177          System.Soft_Links.Abort_Undefer.all;
 178          return Result;
 179       end if;
 180    end Is_Callable;
 181
 182    -------------------
 183    -- Is_Terminated --
 184    -------------------
 185
 186    function Is_Terminated (T : Task_Id) return Boolean is
 187       Result : Boolean;
 188       Id     : constant System.Tasking.Task_Id := Convert_Ids (T);
 189
 190       use System.Tasking;
 191
 192    begin
 193       if T = Null_Task_Id then
 194          raise Program_Error;
 195       else
 196          System.Soft_Links.Abort_Defer.all;
 197
 198          if Single_Lock then
 199             STPO.Lock_RTS;
 200          end if;
 201
 202          STPO.Write_Lock (Id);
 203          Result := Id.Common.State = Terminated;
 204          STPO.Unlock (Id);
 205
 206          if Single_Lock then
 207             STPO.Unlock_RTS;
 208          end if;
 209
 210          System.Soft_Links.Abort_Undefer.all;
 211          return Result;
 212       end if;
 213    end Is_Terminated;
 214
 215 end Ada.Task_Identification;