pw_async2 backends

The pw_async2 interface must be fulfilled by a concrete implementation. You can use one of the Pigweed-provided backends listed below or roll your own. If you roll your own, please consider contributing it to upstream Pigweed!

• pw_async2_basic. A backend that uses a thread-notification-based pw::async2::Dispatcher.

• pw_async2_epoll. A backend that uses a pw::async2::Dispatcher backed by Linux’s epoll notification system.