100 lines
4.9 KiB
Ada
100 lines
4.9 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
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-- --
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-- S Y S T E M . T A S K I N G . Q U E U I N G --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNARL is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNARL was developed by the GNARL team at Florida State University. --
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-- Extensive contributions were provided by Ada Core Technologies, Inc. --
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-- --
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------------------------------------------------------------------------------
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with System.Tasking.Protected_Objects.Entries;
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package System.Tasking.Queuing is
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package POE renames System.Tasking.Protected_Objects.Entries;
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procedure Broadcast_Program_Error
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(Self_ID : Task_Id;
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Object : POE.Protection_Entries_Access;
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Pending_Call : Entry_Call_Link;
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RTS_Locked : Boolean := False);
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-- Raise Program_Error in all tasks calling the protected entries of Object
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-- The exception will not be raised immediately for the calling task; it
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-- will be deferred until it calls Check_Exception.
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-- RTS_Locked indicates whether the global RTS lock is taken (only
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-- relevant if Single_Lock is True).
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procedure Enqueue (E : in out Entry_Queue; Call : Entry_Call_Link);
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-- Enqueue Call at the end of entry_queue E
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procedure Dequeue (E : in out Entry_Queue; Call : Entry_Call_Link);
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-- Dequeue Call from entry_queue E
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function Head (E : Entry_Queue) return Entry_Call_Link;
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pragma Inline (Head);
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-- Return the head of entry_queue E
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procedure Dequeue_Head
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(E : in out Entry_Queue;
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Call : out Entry_Call_Link);
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-- Remove and return the head of entry_queue E
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function Onqueue (Call : Entry_Call_Link) return Boolean;
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pragma Inline (Onqueue);
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-- Return True if Call is on any entry_queue at all
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function Count_Waiting (E : Entry_Queue) return Natural;
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-- Return number of calls on the waiting queue of E
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procedure Select_Task_Entry_Call
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(Acceptor : Task_Id;
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Open_Accepts : Accept_List_Access;
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Call : out Entry_Call_Link;
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Selection : out Select_Index;
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Open_Alternative : out Boolean);
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-- Select an entry for rendezvous. On exit:
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-- Call will contain a pointer to the entry call record selected;
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-- Selection will contain the index of the alternative selected
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-- Open_Alternative will be True if there were any open alternatives
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procedure Select_Protected_Entry_Call
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(Self_ID : Task_Id;
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Object : POE.Protection_Entries_Access;
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Call : out Entry_Call_Link);
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-- Select an entry of a protected object
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procedure Enqueue_Call (Entry_Call : Entry_Call_Link);
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procedure Dequeue_Call (Entry_Call : Entry_Call_Link);
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-- Enqueue (dequeue) the call to (from) whatever server they are
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-- calling, whether a task or a protected object.
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procedure Requeue_Call_With_New_Prio
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(Entry_Call : Entry_Call_Link; Prio : System.Any_Priority);
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-- Change Priority of the call and re insert to the queue when priority
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-- queueing is in effect. When FIFO is enforced, this routine
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-- should not have any effect.
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end System.Tasking.Queuing;
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