------------------------------------------------------------------------------
--                                                                          --
--                 GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS              --
--                                                                          --
--                  S Y S T E M . T A S K I N G . D E B U G                 --
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--                                  S p e c                                 --
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--          Copyright (C) 1997-2004, Free Software Foundation, Inc.         --
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------------------------------------------------------------------------------

--  This package encapsulates all direct interfaces to task debugging services
--  that are needed by gdb with gnat mode.

with System.Tasking;
with System.OS_Interface;

package System.Tasking.Debug is

   ------------------------------------------
   -- Application-level debugging routines --
   ------------------------------------------

   procedure List_Tasks;
   --  Print a list of all the known Ada tasks with abbreviated state
   --  information, one-per-line, to the standard error file.

   procedure Print_Current_Task;
   --  Write information about current task, in hexadecimal, as one line, to
   --  the standard error file.

   procedure Print_Task_Info (T : Task_Id);
   --  Similar to Print_Current_Task, for a given task.

   procedure Set_User_State (Value : Long_Integer);
   --  Set user state value in the current task.
   --  This state will be displayed when calling List_Tasks or
   --  Print_Current_Task. It is useful for setting task specific state.

   function Get_User_State return Long_Integer;
   --  Return the user state for the current task.

   -------------------------
   -- General GDB support --
   -------------------------

   Known_Tasks : array (0 .. 999) of Task_Id;
   --  Global array of tasks read by gdb, and updated by
   --  Create_Task and Finalize_TCB

   ----------------------------------
   -- VxWorks specific GDB support --
   ----------------------------------

   --  Although the following routines are implemented in a target independent
   --  manner, only VxWorks currently uses them.

   procedure Task_Creation_Hook (Thread : OS_Interface.Thread_Id);
   --  This procedure is used to notify GDB of task's creation.
   --  It must be called by the task's creator.

   procedure Task_Termination_Hook;
   --  This procedure is used to notify GDB of task's termination.

   procedure Suspend_All_Tasks (Thread_Self : OS_Interface.Thread_Id);
   --  Suspend all the tasks except the one whose associated thread is
   --  Thread_Self by traversing All_Tasks_Lists and calling
   --  System.Task_Primitives.Operations.Suspend_Task.

   procedure Resume_All_Tasks (Thread_Self : OS_Interface.Thread_Id);
   --  Resume all the tasks except the one whose associated thread is
   --  Thread_Self by traversing All_Tasks_Lists and calling
   --  System.Task_Primitives.Operations.Continue_Task.

   -------------------------------
   -- Run-time tracing routines --
   -------------------------------

   procedure Trace
     (Self_Id  : Task_Id;
      Msg      : String;
      Flag     : Character;
      Other_Id : Task_Id := null);
   --  If traces for Flag are enabled, display on Standard_Error a given
   --  message for the current task. Other_Id is an optional second task id
   --  to display.

   procedure Set_Trace
     (Flag  : Character;
      Value : Boolean := True);
   --  Enable or disable tracing for Flag.
   --  By default, flags in the range 'A' .. 'Z' are disabled, others are
   --  enabled.

end System.Tasking.Debug;