[Bug 209233] [patch] pthread_suspend_all_np races with check_suspend

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209233

--- Comment #6 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Lawrence Esswood from comment #5)
Yes, it is a bug that I left the old test in the loop condition.  I left only
the check for THR_FLAGS_NEED_SUSPEND there, since it is cleared only on resume.

WRT SIGCANCEL generated after loop exit and before thr_signal_unblock.  The
blocked signal list includes SIGCANCEL, thus the SIGCANCEL signal should be
only delivered after unblock. Then typically we would re-enter _thr_ast() with
the different set of flags.

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