mpsc::Receiver::blocking_recv_many: Blocking variant of recv_many

[barafael]

Problem

I'm working on a system where many messages are processed at an FFI boundary, which requires a blocking function call.

Suggested Solution

I would like to receive more than one message if available from a blocking context. Like Receiver::recv_many, but in a thread or task spawned by spawn_blocking.

Alternatives

So far, I've been offloading the blocking work via spawn_blocking and awaiting the handle. This works but is not ideal.

I'd be happy to give this a try.