Example Mutexobj

Jan Burse, created Sep 25. 2016

/**
* Prolog code for the mutex example.
* Foreign function variant.
*
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:- foreign_constructor(new/1, 'example06.Mutex', new).
:- virtual acquire/1.
:- foreign(acquire/1, 'example06.Mutex', acquire).
:- virtual release/1.
:- foreign(release/1, 'example06.Mutex', release).
:- dynamic console/1.
:- dynamic lock/1.
new(Y),
exec(X, Y) :-
atom_concat('Process ', X, A1),
atom_concat(A1, ': ', A2),
atom_concat(A2, Y, A3),
atom_concat(A3, '\n', A4),
write(Z, A4),
lock(Y),
acquire(Y),
( exec(X, 'Ha'),
exec(X, 'Tschi')),
% Window 1
% ?- init.
% ?- process('P1').
% Window 2
% ?- process('P2').
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