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Logtalk - Object oriented extension to Prolog
Release 2.29.4

Copyright (c) 1998-2007 Paulo Moura.  All Rights Reserved.
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% start by loading the loading the example:

| ?- logtalk_load(sync(loader)).
...


% send three asynchronous messages whose corresponding methods perform output operations:

| ?- threaded_ignore(nasty1::io(alpha)), threaded_ignore(nasty1::io(digit)), threaded_ignore(nasty1::io(alpha)).

a0ab1bc2c3ddefef45gg6hh7ii8jkjk9
llmmnnopopqqrrsstztzyyxxwwuv
uv

Yes


% send three asynchronous messages whose corresponding methods perform database updates
% (this may or may not work, most likely will throw an exception):

| ?- threaded_ignore(nasty1::update_db(_)), threaded_ignore(nasty1::update_db(_)), threaded_ignore(nasty1::update_db(_)).

No


% the best solution is to declare predicates that need to be thread synchronized as "synchronized",
% as exemplified in object "nasty2":

| ?- threaded_ignore(nasty2::io(alpha)), threaded_ignore(nasty2::io(digit)), threaded_ignore(nasty2::io(alpha)).

abcdefghijklmnopqrstzyxwuv
0123456789
abcdefghijklmnopqrstzyxwuv

Yes


| ?- threaded_call(nasty2::update_db(_)), threaded_call(nasty2::update_db(_)), threaded_call(nasty2::update_db(_)).

Yes

| ?- threaded_exit(nasty2::update_db(X)), threaded_exit(nasty2::update_db(Y)), threaded_exit(nasty2::update_db(Z)).


X = 1
Y = 2
Z = 3 

Yes