You're redirecting STDERR and STDOUT in a multi-threaded environment for logging? That's brave :)

You could try localising STDOUT and STDERR in the thread before calling inner_worker: 

local *STDOUT;
local *STDERR;

[download]

EDIT: Also:

my $thread1 = threads->create ( \&worker, 1, 'sub1.log' ); 
my $thread2 = threads->create ( \&worker, 2, 'sub2.log' ); 

my $need_to_continue = 1;
while ($need_to_continue) {
    print "MAIN THREAD IS PRINTING\n";
    if ( $thread1->is_running() || $thread2->is_running() ) {
        sleep 3;
    } else {
        $need_to_continue = 0;
    }

}

$thread1->join();
$thread2->join();

exit 0;

[download]
can be re-written thusly: 
my @threads = map {threads->new(\&worker, $_, "sub$_.log")} 1..2;
$_->join for @threads;

exit 0;

[download]
join is a blocking process that waits for the thread to complete.

In reply to Re: capturing output of system call inside a thread by SimonPratt
in thread capturing output of system call inside a thread by that_guy

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