[issue34130] test_signal: test_warn_on_full_buffer() failed on AppVeyor

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> write.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, 0)

Instead of that, I also tried:

read.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
write.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)

But I'm able to reproduce the bug with TCP_NODELAY=1 on the write end. (The option should have no impact on the read end, but I added it anyway, just in case, I still reproduce the bug.)

MSDN documentation for TCP_NODELAY:

"Disables the Nagle algorithm for send coalescing.This socket option is included for backward compatibility with Windows Sockets 1.1 "

https://docs.microsoft.com/en-us/windows/desktop/api/winsock/nf-winsock-setsockopt

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nosy: +yselivanov

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<https://bugs.python.org/issue34130>
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