dbb4756491
of a socket. This avoids lock order reversal caused by locking a process in pgsigio(). sowakeup() and the callers of it (sowwakeup, soisconnected, etc.) now require sigio_lock to be locked. Provide sowwakeup_locked(), soisconnected_locked(), and so on in case where we have to modify a socket and wake up a process atomically.
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