[lwip-devel] [patch #3796] api_lib.c: patch for netconn_write(), fixes a possible race condition

[Jonathan Larmour]

Follow-up Comment #13, patch #3796 (project lwip):

Would SYS_ARCH_PROTECT be a straightforward (albeit ugly) way to avoid the
race here? tcp_sndbuf() is straightforward read of pcb->snd_buf, which is
only assigned to in three places.

Alternatively there could be (another!) message to the tcpip thread to
retrieve the send buffer size.

I think it wouldn't be too hard to fix this completely, even if it's not very
clean.

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