| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-2021, 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 -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- 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); |
| -- 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. |
| |
| 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; |
