------------------------------------------------------------------------------ -- -- -- 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: 1.1.1.1 $ -- -- -- -- 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). -- -- -- ------------------------------------------------------------------------------ -- 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;