| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT 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) 1992-2005, 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, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, 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 Abort 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 abort, however, the actual |
| -- aborti is done by aborted task 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; |
