File : s-tasren.ads
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-- --
-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . T A S K I N G . R E N D E Z V O U S --
-- --
-- S p e c --
-- --
-- $Revision: 1.26 $ --
-- --
-- Copyright (C) 1992-1998, 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. in cooperation with Florida --
-- State University (http://www.gnat.com). --
-- --
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-- Note: the compiler generates direct calls to this interface, via Rtsfind.
-- Any changes to this interface may require corresponding compiler changes.
with Ada.Exceptions;
-- Used for, Exception_Id
with System.Tasking.Protected_Objects.Entries;
-- used for Protection_Entries
package System.Tasking.Rendezvous is
-- This interface is described in the document
-- Gnu Ada Runtime Library Interface (GNARLI).
package STPE renames System.Tasking.Protected_Objects.Entries;
procedure Task_Entry_Call
(Acceptor : Task_ID;
E : Task_Entry_Index;
Uninterpreted_Data : System.Address;
Mode : Call_Modes;
Rendezvous_Successful : out Boolean);
-- General entry call
procedure Timed_Task_Entry_Call
(Acceptor : Task_ID;
E : Task_Entry_Index;
Uninterpreted_Data : System.Address;
Timeout : Duration;
Mode : Delay_Modes;
Rendezvous_Successful : out Boolean);
-- Timed entry call without using ATC.
procedure Call_Simple
(Acceptor : Task_ID;
E : Task_Entry_Index;
Uninterpreted_Data : System.Address);
-- Simple entry call
procedure Cancel_Task_Entry_Call (Cancelled : out Boolean);
-- Cancel pending task entry call
procedure Requeue_Task_Entry
(Acceptor : Task_ID;
E : Task_Entry_Index;
With_Abort : Boolean);
procedure Requeue_Protected_To_Task_Entry
(Object : STPE.Protection_Entries_Access;
Acceptor : Task_ID;
E : Task_Entry_Index;
With_Abort : Boolean);
procedure Selective_Wait
(Open_Accepts : Accept_List_Access;
Select_Mode : Select_Modes;
Uninterpreted_Data : out System.Address;
Index : out Select_Index);
-- Selective wait
procedure Timed_Selective_Wait
(Open_Accepts : Accept_List_Access;
Select_Mode : Select_Modes;
Uninterpreted_Data : out System.Address;
Timeout : Duration;
Mode : Delay_Modes;
Index : out Select_Index);
-- Selective wait with timeout without using ATC.
procedure Accept_Call
(E : Task_Entry_Index;
Uninterpreted_Data : out System.Address);
-- Accept an entry call
procedure Accept_Trivial (E : Task_Entry_Index);
-- Accept an entry call that has no parameters and no body
function Task_Count (E : Task_Entry_Index) return Natural;
-- Return number of tasks waiting on the entry E (of current task)
function Callable (T : Task_ID) return Boolean;
-- Return T'CALLABLE
type Task_Entry_Nesting_Depth is new Task_Entry_Index
range 0 .. Max_Task_Entry;
function Task_Entry_Caller (D : Task_Entry_Nesting_Depth) return Task_ID;
-- Return E'Caller. This will only work if called from within an
-- accept statement that is handling E, as required by the
-- LRM (C.7.1(14)).
procedure Complete_Rendezvous;
-- Called by acceptor to wake up caller
procedure Exceptional_Complete_Rendezvous
(Ex : Ada.Exceptions.Exception_Id);
-- Called by acceptor to mark the end of the current rendezvous and
-- propagate an exception to the caller.
-- For internal use only:
function Task_Do_Or_Queue
(Self_ID : Task_ID;
Entry_Call : Entry_Call_Link;
With_Abort : Boolean) return Boolean;
-- Call this only with abort deferred and holding lock of Acceptor.
-- Returns False iff the call cannot be served or queued, as is the
-- case if the caller is not callable; i.e., a False return value
-- indicates that Tasking_Error should be raised.
-- Either initiate the entry call, such that the accepting task is
-- free to execute the rendezvous, queue the call on the acceptor's
-- queue, or cancel the call. Conditional calls that cannot be
-- accepted immediately are cancelled.
end System.Tasking.Rendezvous;