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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                  GNAT 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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--         Copyright (C) 1992-2009, 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 3,  or (at your option) any later ver- --
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-- sion.  GNAT 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.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNARL was developed by the GNARL team at Florida State University.       --
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-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
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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 Ada.Unchecked_Conversion;
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with System.Task_Primitives;
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package System.Tasking.Utilities is
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   function ATCB_To_Address is new
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     Ada.Unchecked_Conversion (Task_Id, System.Task_Primitives.Task_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 never 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 Abort 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 abort, however, the actual
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   --  aborting is done by aborted task 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 or
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   --  accepting on a terminate alternative. Call holding no locks except
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   --  Global_Task_Lock when calling from Terminate_Task, and RTS_Lock when
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   --  Single_Lock is True.
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end System.Tasking.Utilities;

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