David Cermak bf8ceae780 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
2022-05-16 20:26:44 +02:00
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