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# normal sub - no parameters.
my $thread = async \&subname;
...

# method with args
my $thread = async \&Classname::method, $obj, $arg1, $arg2;

my $thread = threads->create( \&sub, $arg1, $arg2 );

my $thread = threads->new( \&Classname::method, $obj, $arg1, $arg2 );