[lwip-devel] [bug #48220] TCPIP_CORE_LOCKING should be the default

[Joel Cunningham]

Follow-up Comment #2, bug #48220 (project lwip):

Simon,

I think there is an issue with how the loopback adapter uses
tcpip_callback_with_block() that would not work if we converted it to use core
locking which executed the callback in place.

In netif_loop_output(), it schedules netif_poll() to run as the callback after
the output packet has been queued.  The comment at the top of netif_poll seems
to indicate you can't call input from an output function:

/**
 * Call netif_poll() in the main loop of your application. This is to prevent
 * reentering non-reentrant functions like tcp_input(). Packets passed to
 * netif_loop_output() are put on a list that is passed to netif->input() by
 * netif_poll().
 */

It would be nice if we could resolve the reentrancy problems and be able to
use the loopback adapter without having a context switch to do the output

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