gcc/ada/s-tasdeb.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                  GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                --
   4 --                                                                          --
   5 --                  S Y S T E M . T A S K I N G . D E B U G                 --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --          Copyright (C) 1997-2005 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNARL 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. GNARL 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 GNARL; 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 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package encapsulates all direct interfaces to task debugging services
  35 --  that are needed by gdb with gnat mode.
  36
  37 --  Note : This file *must* be compiled with debugging information
  38
  39 --  Do not add any dependency to GNARL packages since this package is used
  40 --  in both normal and restricted (ravenscar) environments.
  41
  42 with System.CRTL;
  43 with System.Task_Primitives.Operations;
  44 with Unchecked_Conversion;
  45
  46 package body System.Tasking.Debug is
  47
  48    package STPO renames System.Task_Primitives.Operations;
  49
  50    function To_Integer is new
  51      Unchecked_Conversion (Task_Id, System.Address);
  52
  53    type Trace_Flag_Set is array (Character) of Boolean;
  54
  55    Trace_On : Trace_Flag_Set := ('A' .. 'Z' => False, others => True);
  56
  57    -----------------------
  58    -- Local Subprograms --
  59    -----------------------
  60
  61    procedure Write (Fd : Integer; S : String; Count : Integer);
  62
  63    procedure Put (S : String);
  64    --  Display S on standard output.
  65
  66    procedure Put_Line (S : String := "");
  67    --  Display S on standard output with an additional line terminator.
  68
  69    --------------------
  70    -- Get_User_State --
  71    --------------------
  72
  73    function Get_User_State return Long_Integer is
  74    begin
  75       return STPO.Self.User_State;
  76    end Get_User_State;
  77
  78    ----------------
  79    -- List_Tasks --
  80    ----------------
  81
  82    procedure List_Tasks is
  83       C : Task_Id;
  84    begin
  85       C := All_Tasks_List;
  86
  87       while C /= null loop
  88          Print_Task_Info (C);
  89          C := C.Common.All_Tasks_Link;
  90       end loop;
  91    end List_Tasks;
  92
  93    ------------------------
  94    -- Print_Current_Task --
  95    ------------------------
  96
  97    procedure Print_Current_Task is
  98    begin
  99       Print_Task_Info (STPO.Self);
 100    end Print_Current_Task;
 101
 102    ---------------------
 103    -- Print_Task_Info --
 104    ---------------------
 105
 106    procedure Print_Task_Info (T : Task_Id) is
 107       Entry_Call : Entry_Call_Link;
 108       Parent     : Task_Id;
 109
 110    begin
 111       if T = null then
 112          Put_Line ("null task");
 113          return;
 114       end if;
 115
 116       Put (T.Common.Task_Image (1 .. T.Common.Task_Image_Len) & ": " &
 117            Task_States'Image (T.Common.State));
 118
 119       Parent := T.Common.Parent;
 120
 121       if Parent = null then
 122          Put (", parent: <none>");
 123       else
 124          Put (", parent: " &
 125               Parent.Common.Task_Image (1 .. Parent.Common.Task_Image_Len));
 126       end if;
 127
 128       Put (", prio:" & T.Common.Current_Priority'Img);
 129
 130       if not T.Callable then
 131          Put (", not callable");
 132       end if;
 133
 134       if T.Aborting then
 135          Put (", aborting");
 136       end if;
 137
 138       if T.Deferral_Level /= 0 then
 139          Put (", abort deferred");
 140       end if;
 141
 142       if T.Common.Call /= null then
 143          Entry_Call := T.Common.Call;
 144          Put (", serving:");
 145
 146          while Entry_Call /= null loop
 147             Put (To_Integer (Entry_Call.Self)'Img);
 148             Entry_Call := Entry_Call.Acceptor_Prev_Call;
 149          end loop;
 150       end if;
 151
 152       if T.Open_Accepts /= null then
 153          Put (", accepting:");
 154
 155          for J in T.Open_Accepts'Range loop
 156             Put (T.Open_Accepts (J).S'Img);
 157          end loop;
 158
 159          if T.Terminate_Alternative then
 160             Put (" or terminate");
 161          end if;
 162       end if;
 163
 164       if T.User_State /= 0 then
 165          Put (", state:" & T.User_State'Img);
 166       end if;
 167
 168       Put_Line;
 169    end Print_Task_Info;
 170
 171    ---------
 172    -- Put --
 173    ---------
 174
 175    procedure Put (S : String) is
 176    begin
 177       Write (2, S, S'Length);
 178    end Put;
 179
 180    --------------
 181    -- Put_Line --
 182    --------------
 183
 184    procedure Put_Line (S : String := "") is
 185    begin
 186       Write (2, S & ASCII.LF, S'Length + 1);
 187    end Put_Line;
 188
 189    ----------------------
 190    -- Resume_All_Tasks --
 191    ----------------------
 192
 193    procedure Resume_All_Tasks (Thread_Self : OS_Interface.Thread_Id) is
 194       C     : Task_Id;
 195       Dummy : Boolean;
 196       pragma Unreferenced (Dummy);
 197
 198    begin
 199       STPO.Lock_RTS;
 200       C := All_Tasks_List;
 201
 202       while C /= null loop
 203          Dummy := STPO.Resume_Task (C, Thread_Self);
 204          C := C.Common.All_Tasks_Link;
 205       end loop;
 206
 207       STPO.Unlock_RTS;
 208    end Resume_All_Tasks;
 209
 210    ---------------
 211    -- Set_Trace --
 212    ---------------
 213
 214    procedure Set_Trace (Flag  : Character; Value : Boolean := True) is
 215    begin
 216       Trace_On (Flag) := Value;
 217    end Set_Trace;
 218
 219    --------------------
 220    -- Set_User_State --
 221    --------------------
 222
 223    procedure Set_User_State (Value : Long_Integer) is
 224    begin
 225       STPO.Self.User_State := Value;
 226    end Set_User_State;
 227
 228    -----------------------
 229    -- Suspend_All_Tasks --
 230    -----------------------
 231
 232    procedure Suspend_All_Tasks (Thread_Self : OS_Interface.Thread_Id) is
 233       C     : Task_Id;
 234       Dummy : Boolean;
 235       pragma Unreferenced (Dummy);
 236
 237    begin
 238       STPO.Lock_RTS;
 239       C := All_Tasks_List;
 240
 241       while C /= null loop
 242          Dummy := STPO.Suspend_Task (C, Thread_Self);
 243          C := C.Common.All_Tasks_Link;
 244       end loop;
 245
 246       STPO.Unlock_RTS;
 247    end Suspend_All_Tasks;
 248
 249    ------------------------
 250    -- Task_Creation_Hook --
 251    ------------------------
 252
 253    procedure Task_Creation_Hook (Thread : OS_Interface.Thread_Id) is
 254       pragma Inspection_Point (Thread);
 255       --  gdb needs to access the thread parameter in order to implement
 256       --  the multitask mode under VxWorks.
 257
 258    begin
 259       null;
 260    end Task_Creation_Hook;
 261
 262    ---------------------------
 263    -- Task_Termination_Hook --
 264    ---------------------------
 265
 266    procedure Task_Termination_Hook is
 267    begin
 268       null;
 269    end Task_Termination_Hook;
 270
 271    -----------
 272    -- Trace --
 273    -----------
 274
 275    procedure Trace
 276      (Self_Id  : Task_Id;
 277       Msg      : String;
 278       Flag     : Character;
 279       Other_Id : Task_Id := null)
 280    is
 281    begin
 282       if Trace_On (Flag) then
 283          Put (To_Integer (Self_Id)'Img &
 284               ':' & Flag & ':' &
 285               Self_Id.Common.Task_Image (1 .. Self_Id.Common.Task_Image_Len) &
 286               ':');
 287
 288          if Other_Id /= null then
 289             Put (To_Integer (Other_Id)'Img & ':');
 290          end if;
 291
 292          Put_Line (Msg);
 293       end if;
 294    end Trace;
 295
 296    -----------
 297    -- Write --
 298    -----------
 299
 300    procedure Write (Fd : Integer; S : String; Count : Integer) is
 301       Discard : Integer;
 302       pragma Unreferenced (Discard);
 303    begin
 304       Discard := System.CRTL.write (Fd, S (S'First)'Address, Count);
 305       --  Is it really right to ignore write errors here ???
 306    end Write;
 307
 308 end System.Tasking.Debug;