[Bug 52401] Improper synchronization in sock_recv/sock_send leads to arbitrary reordering of completion of I/O requests

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52401

--- Comment #2 from Jinoh Kang <jinoh.kang.kr at gmail.com> ---
I realised that more needs to be done to the solution #1, if the socket is in
fact synchronous.

Also, testing for this bug seems quite complicated--we need to block kernel
APCs until after try_recv() has been run.  Can we, well, just block SIGUSR1
temporarily in winetest? Sounds like something we wouldn't do in code freeze.

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