------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K I N G --
-- --
-- B o d y --
-- --
--- $Revision$
--- --
--- Copyright (C) 1991-2001 Florida State University --
+-- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
-- --
-- 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- --
-- 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. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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, --
-- 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). --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
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);
+ ---------------------
+ -- Detect_Blocking --
+ ---------------------
+
+ function Detect_Blocking return Boolean is
+ GL_Detect_Blocking : Integer;
+ pragma Import (C, GL_Detect_Blocking, "__gl_detect_blocking");
+ -- Global variable exported by the binder generated file.
+ -- A value equal to 1 indicates that pragma Detect_Blocking is active,
+ -- while 0 is used for the pragma not being present.
+
+ begin
+ return GL_Detect_Blocking = 1;
+ end Detect_Blocking;
----------
-- Self --
----------
- function Self return Task_ID renames STPO.Self;
+ function Self return Task_Id renames STPO.Self;
---------------------
-- Initialize_ATCB --
---------------------
procedure Initialize_ATCB
- (Self_ID : Task_ID;
+ (Self_ID : Task_Id;
Task_Entry_Point : Task_Procedure_Access;
Task_Arg : System.Address;
- Parent : Task_ID;
+ 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;
+ T : Task_Id;
Success : out Boolean) is
begin
T.Common.State := Unactivated;
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.Protected_Action_Nesting := 0;
T.Common.Call := null;
T.Common.Task_Arg := Task_Arg;
T.Common.Task_Entry_Point := Task_Entry_Point;
T.Common.Elaborated := Elaborated;
T.Common.Activation_Failed := False;
T.Common.Task_Info := Task_Info;
+ T.Common.Global_Task_Lock_Nesting := 0;
+ T.Common.Fall_Back_Handler := null;
+ T.Common.Specific_Handler := null;
if T.Common.Parent = null then
-- For the environment task, the adjusted stack size is
(Parameters.Adjust_Storage_Size (Stack_Size));
end if;
- -- Link the task into the list of all tasks.
+ -- 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.
+ ----------------
+ -- Initialize --
+ ----------------
- Main_Priority : Priority;
+ Main_Task_Image : constant String := "main_task";
+ -- Image of environment task
+
+ Main_Priority : Integer;
pragma Import (C, Main_Priority, "__gl_main_priority");
+ -- Priority for main task. Note that this is of type Integer, not
+ -- Priority, because we use the value -1 to indicate the default
+ -- main priority, and that is of course not in Priority'range.
+
+ Initialized : Boolean := False;
+ -- Used to prevent multiple calls to Initialize
- ----------------------------
- -- 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;
+ procedure Initialize is
+ T : Task_Id;
Success : Boolean;
Base_Priority : Any_Priority;
begin
+ if Initialized then
+ return;
+ end if;
+
+ Initialized := True;
+
-- Initialize Environment Task
if Main_Priority = Unspecified_Priority then
Base_Priority := Default_Priority;
else
- Base_Priority := Main_Priority;
+ Base_Priority := Priority (Main_Priority);
end if;
Success := True;
STPO.Initialize (T);
STPO.Set_Priority (T, T.Common.Base_Priority);
T.Common.State := Runnable;
- T.Common.Task_Image := Main_Task_Image'Unrestricted_Access;
+ T.Common.Task_Image_Len := Main_Task_Image'Length;
+ T.Common.Task_Image (Main_Task_Image'Range) := Main_Task_Image;
-- 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 Initialize;
+
end System.Tasking;
OSDN Git Service
