diogo/yap-6.3
Archived
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Logtalk 2.29.1 files.

Browse Source 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1744 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
This commit is contained in:
pmoura
2006-12-28 13:03:34 +00:00
parent 7316eb490c
commit d79dd807e6
301 changed files with 6700 additions and 998 deletions
Download Patch File Download Diff File Expand all files Collapse all files

121
Logtalk/examples/threads/sync/sync.lgt Normal file
View File

@@ -0,0 +1,121 @@
:- object(nasty1).
:- info([
version is 1.1,
author is 'Paulo Moura',
date is 2006/11/26,
comment is 'Simple example for illustrating the problems with lack of thread synchronization when calling methods with side-effects.']).
:- threaded.
:- public(update_db/1).
:- mode(update_db(-integer), one).
:- info(update_db/1, [
comment is 'Perform a database update with a long delay between retracting the old information and asserting the new one.',
argnames is ['New']]).
:- private(db/1).
:- dynamic(db/1).
:- public(io/1).
:- mode(io(+atom), one).
:- info(io/1, [
comment is 'Write some characters to the standard output stream with a long delay between each write operation.',
argnames is ['Chars']]).
db(0).
update_db(New) :-
retract(db(Old)),
waste_time,
New is Old + 1,
waste_time,
assertz(db(New)).
io(alpha) :-
write(a), waste_time, write(b), waste_time, write(c), waste_time, write(d), waste_time, write(e),
write(f), waste_time, write(g), waste_time, write(h), waste_time, write(i), waste_time, write(j),
write(k), waste_time, write(l), waste_time, write(m), waste_time, write(n), waste_time, write(o),
write(p), waste_time, write(q), waste_time, write(r), waste_time, write(s), waste_time, write(t),
write(z), waste_time, write(y), waste_time, write(x), waste_time, write(w), waste_time, write(u),
write(v), nl.
io(digit) :-
write(0), waste_time, write(1), waste_time, write(2), waste_time, write(3), waste_time, write(4),
write(5), waste_time, write(6), waste_time, write(7), waste_time, write(8), waste_time, write(9), nl.
waste_time :-
between(1, 10000, _),
fail.
waste_time.
between(Lower, _, Lower).
between(Lower, Upper, Integer) :-
Lower < Upper,
Next is Lower + 1,
between(Next, Upper, Integer).
:- end_object.
:- object(nasty2).
:- info([
version is 1.1,
author is 'Paulo Moura',
date is 2006/11/26,
comment is 'Simple example for using the "synchronized" predicate directive for multi-threading methods with side-effects.']).
:- threaded.
:- public(update_db/1).
:- synchronized(update_db/1).
:- mode(update_db(-integer), one).
:- info(update_db/1, [
comment is 'Perform a database update with a long delay between retracting the old information and asserting the new one.',
argnames is ['New']]).
:- private(db/1).
:- dynamic(db/1).
:- public(io/1).
:- synchronized(io/1).
:- mode(io(+atom), one).
:- info(io/1, [
comment is 'Write some characters to the standard output stream with a long delay between each write operation.',
argnames is ['Chars']]).
db(0).
update_db(New) :-
retract(db(Old)),
waste_time,
New is Old + 1,
waste_time,
assertz(db(New)).
io(alpha) :-
write(a), waste_time, write(b), waste_time, write(c), waste_time, write(d), waste_time, write(e),
write(f), waste_time, write(g), waste_time, write(h), waste_time, write(i), waste_time, write(j),
write(k), waste_time, write(l), waste_time, write(m), waste_time, write(n), waste_time, write(o),
write(p), waste_time, write(q), waste_time, write(r), waste_time, write(s), waste_time, write(t),
write(z), waste_time, write(y), waste_time, write(x), waste_time, write(w), waste_time, write(u),
write(v), nl.
io(digit) :-
write(0), waste_time, write(1), waste_time, write(2), waste_time, write(3), waste_time, write(4),
write(5), waste_time, write(6), waste_time, write(7), waste_time, write(8), waste_time, write(9), nl.
waste_time :-
between(1, 100000, _),
fail.
waste_time.
between(Lower, _, Lower).
between(Lower, Upper, Integer) :-
Lower < Upper,
Next is Lower + 1,
between(Next, Upper, Integer).
:- end_object.