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BusABC.recv: keep calling _recv_internal until it returns None #1686

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BusABC.recv: keep calling _recv_internal until it returns None #1686

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Commits on Oct 27, 2023

  1. BusABC.recv: keep calling _recv_internal until it returns None 

    Even if recv() is called with timeout=0, the caller's intention is
probably for recv() to check all of the messages that have already
arrived at the interface until one of them matches the filters.

This is already the way recv() behaves for interface drivers that take
advantage of hardware or OS-level filtering, but those that use BusABC's
default software-based filtering might return None even if a matching
message has already arrived.
    @malsyned
    malsyned committed Oct 27, 2023
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