------------------------------------------------------------------------------ -- -- -- GNAT 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) 1992-2018, 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 3, or (at your option) any later ver- -- -- sion. GNAT 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNARL was developed by the GNARL team at Florida State University. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ 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 : Entry_Queue) return Entry_Call_Link; pragma Inline (Head); -- Return the head of entry_queue E 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; pragma Inline (Onqueue); -- Return True if Call is on any entry_queue at all function Count_Waiting (E : 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 enforced, this routine -- should not have any effect. end System.Tasking.Queuing;