parallel\Events::setTimeout — Behaviour
By default when events are polled for, blocking will occur (at the PHP level) until the first event can be returned: Setting the timeout causes an exception to be thrown when the timeout is reached.
This differs from setting blocking mode to false with parallel\Events::setBlocking(), which will not cause an exception to be thrown.
$timeout) : void
Shall set the timeout in microseconds
Shall throw \parallel\Events\Error if loop is non-blocking.