internal: Worker pool improvements - Slightly more correct multi-processing code. - Handle critical worker failures. - Correctly setup workers when run from `py.test`. - Add support for using `msgpack` or `marshall` instead of `pickle`.

---
title: Plugin Components
---

Once you've [created a plugin][1], you need to make it provide new _components_.

{% for comp in family.children -%}
* [{{comp.title}}]({{comp.url}})
{% endfor %}

[1]: {{apiurl('plugins')}}