[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

            Bug ID: 209233
           Summary: [patch] pthread_suspend_all_np races with
                    check_suspend
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: threads
          Assignee: freebsd-threads at FreeBSD.org
          Reporter: le277 at cam.ac.uk
          Keywords: patch

Created attachment 169926
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169926&action=edit
Patch to fix race

Currently the suspend all implementation in libthr only sets the NEED_SUSPEND
flag if a thread does not have the SUSPENDED flag set. However, that thread may
be in the process of resuming, and so its NEED_SUSPEND flag should always be
set if we wish a thread to stay suspended, even if already has the SUSPENDED
flag set.

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