note
Zaxo
<p>[liz]++, thanks.</p>
<p>I got curious about how closures would do, so I tried your technique to see what happens (perl 5.8.1-RC2),
<code>use threads();
{
my $foo = 'bar';
sub foo () :lvalue { $foo }
}
threads->new(
sub {
foo = 'quux';
print 'thread: coderef = ', \&foo, $/;
print 'foo is ', foo, $/;
}
)->join;
print 'main: coderef = ', \&foo, $/;
print 'foo is ', foo, $/;
__END__
$ perl thrcl.pl
thread: coderef = CODE(0x8129538)
foo is quux
main: coderef = CODE(0x8060674)
foo is bar</code>
so the object of the closure is duplicated - you did say <em>everything</em>, but I had to check.</p>
<p>Now, what if I want all threads to see the same thing?
<code>use threads();
use threads::shared;
{
my $foo :shared = 'bar';
sub foo () :lvalue { $foo }
}
threads->new(
sub {
foo = 'quux';
print 'thread: coderef = ', \&foo, $/;
print 'foo is ', foo, $/;
}
)->join;
print 'main: coderef = ', \&foo, $/;
print 'foo is ', foo, $/;
__END__
$ perl thrcl.pl
thread: coderef = CODE(0x8163924)
foo is quux
main: coderef = CODE(0x80fe448)
foo is quux</code>
so both foo()'s point to the same cloistered object.</p>
<p>Trying to stick the :shared attribute on <tt>sub foo</tt> did no good. I expected it to prevent duplication of the code, but perl smacked me down with,
<code>$ perl thrcl.pl
Invalid CODE attribute: shared at thrcl.pl line 5
BEGIN failed--compilation aborted at thrcl.pl line 5.</code>
I suspect I need to read some more of the fine manual.</p>
<p>After Compline,<br/>Zaxo</p>
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