+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- S Y S T E M . T A S K I N G --
--- --
--- B o d y --
--- --
--- $Revision: 1.1 $
--- --
--- Copyright (C) 1991-2001 Florida State University --
--- --
--- GNARL is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. It is --
--- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
--- State University (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
-pragma Polling (Off);
--- Turn off polling, we do not want ATC polling to take place during
--- tasking operations. It causes infinite loops and other problems.
-
-with System.Task_Primitives.Operations;
--- used for Self
-
-with Unchecked_Deallocation;
--- To recover from failure of ATCB initialization.
-
-with System.Storage_Elements;
--- Needed for initializing Stack_Info.Size
-
-with System.Parameters;
--- Used for Adjust_Storage_Size
-
-package body System.Tasking is
-
- package STPO renames System.Task_Primitives.Operations;
-
- procedure Free is new
- Unchecked_Deallocation (Ada_Task_Control_Block, Task_ID);
-
- ----------
- -- Self --
- ----------
-
- function Self return Task_ID renames STPO.Self;
-
- ---------------------
- -- Initialize_ATCB --
- ---------------------
-
- -- Call this only with abort deferred and holding All_Tasks_L.
-
- procedure Initialize_ATCB
- (Self_ID : Task_ID;
- Task_Entry_Point : Task_Procedure_Access;
- Task_Arg : System.Address;
- Parent : Task_ID;
- Elaborated : Access_Boolean;
- Base_Priority : System.Any_Priority;
- Task_Info : System.Task_Info.Task_Info_Type;
- Stack_Size : System.Parameters.Size_Type;
- T : in out Task_ID;
- Success : out Boolean) is
- begin
- T.Common.State := Unactivated;
-
- -- Initialize T.Common.LL
-
- STPO.Initialize_TCB (T, Success);
-
- if not Success then
- Free (T);
- return;
- end if;
-
- T.Common.Parent := Parent;
- T.Common.Base_Priority := Base_Priority;
- T.Common.Current_Priority := 0;
- T.Common.Call := null;
- T.Common.Task_Arg := Task_Arg;
- T.Common.Task_Entry_Point := Task_Entry_Point;
- T.Common.Activator := Self_ID;
- T.Common.Wait_Count := 0;
- T.Common.Elaborated := Elaborated;
- T.Common.Activation_Failed := False;
- T.Common.Task_Info := Task_Info;
-
- if T.Common.Parent = null then
- -- For the environment task, the adjusted stack size is
- -- meaningless. For example, an unspecified Stack_Size means
- -- that the stack size is determined by the environment, or
- -- can grow dynamically. The Stack_Checking algorithm
- -- therefore needs to use the requested size, or 0 in
- -- case of an unknown size.
-
- T.Common.Compiler_Data.Pri_Stack_Info.Size :=
- Storage_Elements.Storage_Offset (Stack_Size);
-
- else
- T.Common.Compiler_Data.Pri_Stack_Info.Size :=
- Storage_Elements.Storage_Offset
- (Parameters.Adjust_Storage_Size (Stack_Size));
- end if;
-
- -- Link the task into the list of all tasks.
-
- T.Common.All_Tasks_Link := All_Tasks_List;
- All_Tasks_List := T;
- end Initialize_ATCB;
-
- Main_Task_Image : aliased String := "main_task";
- -- Declare a global variable to avoid allocating dynamic memory.
-
- Main_Priority : Priority;
- pragma Import (C, Main_Priority, "__gl_main_priority");
-
- ----------------------------
- -- Tasking Initialization --
- ----------------------------
-
- -- This block constitutes the first part of the initialization of the
- -- GNARL. This includes creating data structures to make the initial thread
- -- into the environment task. The last part of the initialization is done
- -- in System.Tasking.Initialization or System.Tasking.Restricted.Stages.
- -- All the initializations used to be in Tasking.Initialization, but this
- -- is no longer possible with the run time simplification (including
- -- optimized PO and the restricted run time) since one cannot rely on
- -- System.Tasking.Initialization being present, as was done before.
-
-begin
- declare
- T : Task_ID;
- Success : Boolean;
- Base_Priority : Any_Priority;
-
- begin
- -- Initialize Environment Task
-
- if Main_Priority = Unspecified_Priority then
- Base_Priority := Default_Priority;
- else
- Base_Priority := Main_Priority;
- end if;
-
- Success := True;
- T := STPO.New_ATCB (0);
- Initialize_ATCB
- (null, null, Null_Address, Null_Task, null, Base_Priority,
- Task_Info.Unspecified_Task_Info, 0, T, Success);
- pragma Assert (Success);
-
- STPO.Initialize (T);
- STPO.Set_Priority (T, T.Common.Base_Priority);
- T.Common.State := Runnable;
- T.Common.Task_Image := Main_Task_Image'Unrestricted_Access;
-
- -- Only initialize the first element since others are not relevant
- -- in ravenscar mode. Rest of the initialization is done in Init_RTS.
-
- T.Entry_Calls (1).Self := T;
- end;
-end System.Tasking;
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