mpsc::Receiver::try_recv_many

[barafael]

Problem

I want to receive data from an mpsc within the sync world. I want to be able to receive multiple items if available for faster processing and less context switching.

Solution

mpsc::Receiver::try_recv bridges the async-sync gap. It would be great if it had a variant similar to async recv_many.

Alternatives

It would be possible to keep calling try_recv in a loop until it fails and push the data into a vector manually. This would at least incur the cost of possibly growing that vector.

[wathenjiang]

It seems that unless recv_many is optimized internally, the performance difference between providing this try_recv_many and calling try_recv in a loop will not be particularly large.

Please see:

• https://www.reddit.com/r/rust/comments/1cdv300/combatting_overreliance_on_mpsc_channels/
• https://github.com/tokio-rs/tokio/blob/c8f3539bc11e57843745c68ee60ca5276248f9f9/benches/sync_mpsc.rs#L76

[barafael]

thanks for clarifying!