| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- 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; |
