Hum, "buffered IO" and "buffer-fulls"

Remember what I was saying about buffering?

Your modification of my code, mildy modified:

#! perl -slw
use strict;
use Time::HiRes qw[ time sleep ];
use threads;
use threads::shared;

our $THREADS ||= 4;

my $sem :shared;
open LOG, '>', 'log.txt' or die $!;
my $old = select LOG;
$|++;
select $old;


sub logit {
    lock $sem;
    return printf LOG @_;
}

sub thread {
    my $tid = threads->self->tid;
    my $stop = shift;
    warn $tid, ": starting:", time(), " Stoptime: $stop\n";
    while( time() < $stop ) {
        logit "%2d: The time is %f\n", $tid, time;
    }
    warn $tid, ": stopping at ", time(), "\n";
}

my @threads = map
    threads->create( \&thread, time() + int( rand 10 ) ),
    1 .. $THREADS;

warn "threads started; waiting\n";
$_->join for @threads;

warn "threads done\n";
[download]

When I run that under *nix:

mehere@mehere-desktop:~/perl$ perl -v
This is perl, v5.10.0 built for x86_64-linux-gnu-thread-multi
...

mehere@mehere-desktop:~/perl$ wc -l log.txt
173746 log.txt
[download]

It created a 173000 line file that is flawless!