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yap-6.3/packages/clib/streampool.pl~

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2010-06-17 00:40:25 +01:00
/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: jan@swi.psy.uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2002, University of Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT 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 Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library 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 General Public License.
*/
:- module(stream_pool,
[ add_stream_to_pool/2, % +Stream, :Goal
delete_stream_from_pool/1, % +Stream
close_stream_pool/0,
dispatch_stream_pool/1, % +TimeOut
stream_pool_main_loop/0
]).
:- use_module(library(quintus)).
:- meta_predicate
add_stream_to_pool(+, :).
:- volatile
pool/2. % sockets don't survive a saved-state
:- dynamic
pool/2. % Stream, Action
% add_stream_to_pool(+Stream :Goal)
%
% Call Goal whenever there is input on Stream.
add_stream_to_pool(Stream, Action) :-
strip_module(Action, Module, Plain),
register_stream(Stream, Module:Plain).
register_stream(Stream, Goal) :-
assert(pool(Stream, Goal)).
% delete_stream_from_pool(+Stream)
%
% Retract stream from the pool
delete_stream_from_pool(Stream) :-
retractall(pool(Stream, _)).
% close_stream_pool
close_stream_pool :-
( retract(pool(Stream, _)),
close(Stream, [force(true)]),
fail
; true
).
% dispatch_stream_pool(+TimeOut)
%
% Wait for input on one or more streams and handle that. Wait for
% at most TimeOut seconds (0 means infinite).
dispatch_stream_pool(Timeout) :-
findall(S, pool(S, _), Pool),
catch(wait_for_input(Pool, Ready, Timeout), E, true),
debug(tcp, 'Select ~w --> ~w (E=~w)', [Pool, Ready, E]),
( var(E)
-> actions(Ready)
; E = error(existence_error(stream, Stream), _)
-> delete_stream_from_pool(Stream)
).
actions([]).
actions([H|T]) :-
action(H),
actions(T).
action(Stream) :-
pool(Stream, Action),
( catch(Action, E, true)
-> ( var(E)
-> true
; print_message(error, E)
)
; print_message(warning,
goal_failed(Action, stream_pool))
).
% stream_pool_main_loop
%
% Keep handling input from the streams in the pool until they have
% all died away.
stream_pool_main_loop :-
pool(_, _), !,
( current_prolog_flag(windows, true)
-> dispatch_stream_pool(1) % so we can break out easily
; dispatch_stream_pool(0)
),
stream_pool_main_loop.
stream_pool_main_loop.