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[lwip-users] Are recv/send/write reentrant if LWIP_NETCONN_FULLDUPLEX en

From: Grant Edwards
Subject: [lwip-users] Are recv/send/write reentrant if LWIP_NETCONN_FULLDUPLEX enabled?
Date: Wed, 17 Nov 2021 17:16:18 -0000 (UTC)
User-agent: slrn/1.0.3 (Linux)

My (newly generated 2.1.3) documentation says that
LWIP_NETCONN_FULLDUPLEX "allows reading from one thread, writing from
a 2nd thread and closing from a 3rd thread". [And the "really alpha"
statement is indeed gone.]

I assume that does not imply that recv/send/write are renntrant such
that two threads could write to a socket/netconn at the same time? Two
sockets reading at the same time is less common, but would be another

This situation doesn't really make much sense for TCP, but I have seen
applications where it is done for UDP and raw Ethernet.


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