------------------------------------------------------------------------------ -- -- -- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . T A S K I N G . Q U E U I N G -- -- -- -- S p e c -- -- -- -- -- -- Copyright (C) 1992-2001, 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. It is -- -- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). -- -- -- ------------------------------------------------------------------------------ with System.Tasking.Protected_Objects.Entries; package System.Tasking.Queuing is package POE renames System.Tasking.Protected_Objects.Entries; procedure Broadcast_Program_Error (Self_ID : Task_ID; Object : POE.Protection_Entries_Access; Pending_Call : Entry_Call_Link; RTS_Locked : Boolean := False); -- Raise Program_Error in all tasks calling the protected entries of Object -- The exception will not be raised immediately for the calling task; it -- will be deferred until it calls Check_Exception. -- RTS_Locked indicates whether the global RTS lock is taken (only -- relevant if Single_Lock is True). procedure Enqueue (E : in out Entry_Queue; Call : Entry_Call_Link); -- Enqueue Call at the end of entry_queue E procedure Dequeue (E : in out Entry_Queue; Call : Entry_Call_Link); -- Dequeue Call from entry_queue E function Head (E : in Entry_Queue) return Entry_Call_Link; -- Return the head of entry_queue E pragma Inline (Head); procedure Dequeue_Head (E : in out Entry_Queue; Call : out Entry_Call_Link); -- Remove and return the head of entry_queue E function Onqueue (Call : Entry_Call_Link) return Boolean; -- Return True if Call is on any entry_queue at all pragma Inline (Onqueue); function Count_Waiting (E : in Entry_Queue) return Natural; -- Return number of calls on the waiting queue of E procedure Select_Task_Entry_Call (Acceptor : Task_ID; Open_Accepts : Accept_List_Access; Call : out Entry_Call_Link; Selection : out Select_Index; Open_Alternative : out Boolean); -- Select an entry for rendezvous. On exit: -- Call will contain a pointer to the entry call record selected; -- Selection will contain the index of the alternative selected -- Open_Alternative will be True if there were any open alternatives procedure Select_Protected_Entry_Call (Self_ID : Task_ID; Object : POE.Protection_Entries_Access; Call : out Entry_Call_Link); -- Select an entry of a protected object procedure Enqueue_Call (Entry_Call : Entry_Call_Link); procedure Dequeue_Call (Entry_Call : Entry_Call_Link); -- Enqueue (dequeue) the call to (from) whatever server they are -- calling, whether a task or a protected object. procedure Requeue_Call_With_New_Prio (Entry_Call : Entry_Call_Link; Prio : System.Any_Priority); -- Change Priority of the call and re insert to the queue when priority -- queueing is in effect. When FIFO is inforced, this routine -- should not have any effect. end System.Tasking.Queuing;