David Cermak b972b442e0 vfs: Fix potential select() race if both sock and other-fd trigger ...

This fixes a potential race condition in select() if both a socket-fd
and non-socket fd trigger simultaneously to unblock this select.
In case of both fds, we use lwip's local thread semaphore, so we only
have to try return it (if it was taken/triggered more than once) when
we exit select().

Closes https://github.com/espressif/esp-idf/issues/8896

2022-06-21 16:39:58 +00:00

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