------------------------------------------------------------------------------ -- -- -- 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) 1992-2004, 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. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ -- 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;