parallel\Events::setBlocking

Behaviour

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By default when events are polled for, blocking will occur (at the PHP level) until the first event can be returned: Setting blocking mode to &false; will cause poll to return control if the first target polled is not ready.

This differs from setting a timeout of 0 with `parallel\Events::setTimeout`, since a timeout of 0, while allowed, will cause an exception to be raised, which may be extremely slow or wasteful if what is really desired is non-blocking behaviour.

A non-blocking loop effects the return value of `parallel\Events::poll`, such that it may be &null; before all events have been processed.

public `void` `parallel\Events::setBlocking` `bool` `blocking`

Shall set blocking mode

## Exceptions

Shall throw `parallel\Events\Error` if loop has timeout set.