107 lines
5.8 KiB
Ada
107 lines
5.8 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . T A S K I N G . U T I L I T I E S --
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-- --
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-- S p e c --
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-- --
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-- --
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-- Copyright (C) 1992-2002, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNARL; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. It is --
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-- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This package provides RTS Internal Declarations.
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-- These declarations are not part of the GNARLI
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with Unchecked_Conversion;
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package System.Tasking.Utilities is
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function ATCB_To_Address is new
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Unchecked_Conversion (Task_ID, System.Address);
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---------------------------------
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-- Task_Stage Related routines --
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---------------------------------
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procedure Make_Independent;
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-- Move the current task to the outermost level (level 2) of the master
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-- hierarchy of the environment task. That is one level further out
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-- than normal tasks defined in library-level packages (level 3). The
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-- environment task will wait for level 3 tasks to terminate normally,
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-- then it will abort all the level 2 tasks. See Finalize_Global_Tasks
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-- procedure for more information.
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--
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-- This is a dangerous operation, and should only be used on nested tasks
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-- or tasks that depend on any objects that might be finalized earlier than
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-- the termination of the environment task. It is for internal use by the
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-- GNARL, to prevent such internal server tasks from preventing a partition
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-- from terminating.
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--
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-- Also note that the run time assumes that the parent of an independent
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-- task is the environment task. If this is not the case, Make_Independent
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-- will change the task's parent. This assumption is particularly
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-- important for master level completion and for the computation of
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-- Independent_Task_Count.
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Independent_Task_Count : Natural := 0;
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-- Number of independent task. This counter is incremented each time
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-- Make_Independent is called. Note that if a server task terminates,
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-- this counter will not be decremented. Since Make_Independent locks
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-- the environment task (because every independent task depends on it),
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-- this counter is protected by the environment task's lock.
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------------------------------------
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-- Task Abortion related routines --
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------------------------------------
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procedure Cancel_Queued_Entry_Calls (T : Task_ID);
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-- Cancel any entry calls queued on target task.
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-- Call this while holding T's lock (or RTS_Lock in Single_Lock mode).
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procedure Exit_One_ATC_Level (Self_ID : Task_ID);
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pragma Inline (Exit_One_ATC_Level);
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-- Call only with abort deferred and holding lock of Self_ID.
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-- This is a bit of common code for all entry calls.
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-- The effect is to exit one level of ATC nesting.
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procedure Abort_One_Task (Self_ID : Task_ID; T : Task_ID);
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-- Similar to Locked_Abort_To_Level (Self_ID, T, 0), but:
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-- (1) caller should be holding no locks
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-- (2) may be called for tasks that have not yet been activated
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-- (3) always aborts whole task
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procedure Abort_Tasks (Tasks : Task_List);
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-- Abort_Tasks is called to initiate abortion, however, the actual
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-- abortion is done by abortee by means of Abort_Handler
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procedure Make_Passive (Self_ID : Task_ID; Task_Completed : Boolean);
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-- Update counts to indicate current task is either terminated
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-- or accepting on a terminate alternative.
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-- Call holding no locks except Global_Task_Lock when calling from
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-- Terminate_Task, and RTS_Lock when Single_Lock is True.
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end System.Tasking.Utilities;
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