question about forked processes writing to the same file

is this dangerous? for instance, is there ever a danger of race
conditions/locking/etc if i have:

use strict; use warnings;
use Parallel::ForkManager;

my $pm = Parallel::ForkManager->new(10);

# assume @files contains 100 files that will be processed,
# and processing time could range from subseconds to hours

my $out = 'results.txt';
for my $file (@files) {
$pm->start and next;

# some code to process file
# blah blah blah

open( my $fh_out, '>', $out ) or die "can't open $out: $!\n";
print $fh_out "$file\n";
close $fh_out;

$pm->finish;
}
$pm->wait_all_children;

.

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