-- --
-- S p e c --
-- --
--- --
--- Copyright (C) 1992-2002, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2003, 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- --
-- 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. (http://www.gnat.com). --
+-- GNARL was developed by the GNARL team at Florida State University. --
+-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- used for Size_Type
with System.Task_Info;
--- used for Task_Info_Type, Task_Image_Type
+-- used for Task_Info_Type
with System.Soft_Links;
-- used for TSD
-- State >= Done, in which case it may or may not be still Onqueue.
-- Please do not modify the order of the values, without checking
- -- all uses of this type. We rely on partial "monotonicity" of
+ -- all uses of this type. We rely on partial "monotonicity" of
-- Entry_Call_Record.State to avoid locking when we access this
- -- value for certain tests. In particular:
+ -- value for certain tests. In particular:
-- 1) Once State >= Done, we can rely that the call has been
- -- completed. If State >= Done, it will not
+ -- completed. If State >= Done, it will not
-- change until the task does another entry call at this level.
-- 2) Once State >= Was_Abortable, we can rely that the call has
-- Note: The order of the fields is important to implement efficiently
-- tasking support under gdb.
-- Currently gdb relies on the order of the State, Parent, Base_Priority,
- -- Task_Image, Call and LL fields.
+ -- Task_Image, Task_Image_Len, Call and LL fields.
----------------------------------------------------------------------
-- Common ATCB section --
-- accepts an entry or when Created activates, at which points Self is
-- suspended.
- Task_Image : System.Task_Info.Task_Image_Type;
- -- holds an access to string that provides a readable id for task,
+ Task_Image : String (1 .. 32);
+ -- Hold a string that provides a readable id for task,
-- built from the variable of which it is a value or component.
+ Task_Image_Len : Natural;
+ -- Actual length of Task_Image.
+
Call : Entry_Call_Link;
-- The entry call that has been accepted by this task.
-- Protection: Self.L. Self will modify this field
-- takes care of all of its synchronization.
Task_Arg : System.Address;
- -- The argument to task procedure. Currently unused; this will
- -- provide a handle for discriminant information.
+ -- The argument to task procedure. Provide a handle for discriminant
+ -- information.
-- Protection: Part of the synchronization between Self and
-- Activator. Activator writes it, once, before Self starts
-- executing. Thereafter, Self only reads it.
type Entry_Call_Array is array (ATC_Level_Index) of
aliased Entry_Call_Record;
- D_I_Count : constant := 2;
- -- This constant may be adjusted, to allow more Address-sized
- -- attributes to be stored directly in the task control block.
-
- subtype Direct_Index is Integer range 0 .. D_I_Count - 1;
+ type Direct_Index is range 0 .. Parameters.Default_Attribute_Count;
+ subtype Direct_Index_Range is Direct_Index range 1 .. Direct_Index'Last;
-- Attributes with indices in this range are stored directly in
- -- the task control block. Such attributes must be Address-sized.
+ -- the task control block. Such attributes must be Address-sized.
-- Other attributes will be held in dynamically allocated records
-- chained off of the task control block.
+ type Direct_Attribute_Element is mod Memory_Size;
+ pragma Atomic (Direct_Attribute_Element);
+
type Direct_Attribute_Array is
- array (Direct_Index) of aliased System.Address;
+ array (Direct_Index_Range) of aliased Direct_Attribute_Element;
- type Direct_Index_Vector is mod 2 ** D_I_Count;
+ type Direct_Index_Vector is mod 2 ** Parameters.Default_Attribute_Count;
-- This is a bit-vector type, used to store information about
-- the usage of the direct attribute fields.
-- signal (and resulting abortion exception) are not handled any more.
-- In other words, the flag prevents a race between multiple aborters
-- and the abortee.
- -- Protection: Self.L.
+ -- Protection: protected by atomic access.
ATC_Hack : Boolean := False;
pragma Atomic (ATC_Hack);
Pending_Action : Boolean := False;
-- Unified flag indicating some action needs to be take when abort
- -- next becomes undeferred. Currently set if:
+ -- next becomes undeferred. Currently set if:
-- . Pending_Priority_Change is set
-- . Pending_ATC_Level is changed
-- . Requeue involving POs
Known_Tasks_Index : Integer := -1;
-- Index in the System.Tasking.Debug.Known_Tasks array.
- User_State : Integer := 0;
- -- user-writeable location, for use in debugging tasks;
- -- debugger can display this value to show where the task currently
- -- is, in user terms
+ User_State : Long_Integer := 0;
+ -- User-writeable location, for use in debugging tasks;
+ -- also provides a simple task specific data.
Direct_Attributes : Direct_Attribute_Array;
-- For task attributes that have same size as Address
-- Protection: Self.L. Once a task has set Self.Stage to Completing, it
-- has exclusive access to this field.
end record;
- pragma Volatile (Ada_Task_Control_Block);
---------------------
-- Initialize_ATCB --
pragma Volatile (Activation_Chain);
-- Activation_chain is an in-out parameter of initialization procedures
- -- and it must be passed by reference because the init_proc may terminate
+ -- and it must be passed by reference because the init proc may terminate
-- abnormally after creating task components, and these must be properly
-- registered for removal (Expunge_Unactivated_Tasks).
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