| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 -- |
| -- -- |
| -- $Revision: 1.34 $ -- |
| -- -- |
| -- Copyright (C) 1991-1998 Florida State University -- |
| -- -- |
| -- 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. in cooperation with Florida -- |
| -- State University (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 1) of the master |
| -- master hierarchy of the environment task. This is one level further |
| -- out than normal tasks defined in library-level packages (level 2). |
| -- The environment task will wait for level 2 tasks to terminate normally, |
| -- then it will abort all the level 1 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 |
| -- GNARL, to prevent such internal server tasks from preventing a |
| -- partition from terminating. |
| |
| 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. |
| -- Do not call this while holding any locks. |
| |
| 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. |
| |
| end System.Tasking.Utilities; |
