K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2017-05-12T15:34:59.932426Z
K 7
svn:log
V 721
Do not wake up sleeping thread in reschedule_signals() if the signal
is blocked.  The spurious wakeup might result in spurious EINTR.

The reschedule_signals() function is called when the calling thread
has the signal mask changed.  For each newly blocked signal, we try to
find a thread which might have the signal not blocked.  If no such
thread exists, sigtd() returns random thread, which must not be waken
up.  I decided that re-checking, as suggested by PR submitter, is more
reasonable change than to change sigtd() interface, due to other uses
of sigtd().  signotify() already performs this check.

Submitted by:	Duane <parakleta@darkreality.org>
PR:	219228
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END