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------------------------------------------------------------------------------
-- --
-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K I N G . U T I L I T I E S --
-- --
-- S p e c --
-- --
-- --
-- Copyright (C) 1992-2002, 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- --
-- 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. (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- This package provides RTS Internal Declarations.
-- These declarations are not part of the GNARLI
with Unchecked_Conversion;
package System.Tasking.Utilities is
function ATCB_To_Address is new
Unchecked_Conversion (Task_ID, System.Address);
---------------------------------
-- Task_Stage Related routines --
---------------------------------
procedure Make_Independent;
-- Move the current task to the outermost level (level 2) of the master
-- hierarchy of the environment task. That is one level further out
-- than normal tasks defined in library-level packages (level 3). The
-- environment task will wait for level 3 tasks to terminate normally,
-- then it will abort all the level 2 tasks. See Finalize_Global_Tasks
-- procedure for more information.
--
-- This is a dangerous operation, and should only be used on nested tasks
-- or tasks that depend on any objects that might be finalized earlier than
-- the termination of the environment task. It is for internal use by the
-- GNARL, to prevent such internal server tasks from preventing a partition
-- from terminating.
--
-- Also note that the run time assumes that the parent of an independent
-- task is the environment task. If this is not the case, Make_Independent
-- will change the task's parent. This assumption is particularly
-- important for master level completion and for the computation of
-- Independent_Task_Count.
Independent_Task_Count : Natural := 0;
-- Number of independent task. This counter is incremented each time
-- Make_Independent is called. Note that if a server task terminates,
-- this counter will not be decremented. Since Make_Independent locks
-- the environment task (because every independent task depends on it),
-- this counter is protected by the environment task's lock.
------------------------------------
-- Task Abortion related routines --
------------------------------------
procedure Cancel_Queued_Entry_Calls (T : Task_ID);
-- Cancel any entry calls queued on target task.
-- Call this while holding T's lock (or RTS_Lock in Single_Lock mode).
procedure Exit_One_ATC_Level (Self_ID : Task_ID);
pragma Inline (Exit_One_ATC_Level);
-- Call only with abort deferred and holding lock of Self_ID.
-- This is a bit of common code for all entry calls.
-- The effect is to exit one level of ATC nesting.
procedure Abort_One_Task (Self_ID : Task_ID; T : Task_ID);
-- Similar to Locked_Abort_To_Level (Self_ID, T, 0), but:
-- (1) caller should be holding no locks
-- (2) may be called for tasks that have not yet been activated
-- (3) always aborts whole task
procedure Abort_Tasks (Tasks : Task_List);
-- Abort_Tasks is called to initiate abortion, however, the actual
-- abortion is done by abortee by means of Abort_Handler
procedure Make_Passive (Self_ID : Task_ID; Task_Completed : Boolean);
-- Update counts to indicate current task is either terminated
-- or accepting on a terminate alternative.
-- Call holding no locks except Global_Task_Lock when calling from
-- Terminate_Task, and RTS_Lock when Single_Lock is True.
end System.Tasking.Utilities;
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