Comment 7 for bug 1454873

Reviewed: https://review.openstack.org/183216
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=d29bb1927489d5590f17d2f3ef2904b6f5edd0d4
Submitter: Jenkins
Branch: master

commit d29bb1927489d5590f17d2f3ef2904b6f5edd0d4
Author: Zane Bitter <email address hidden>
Date: Thu May 14 16:50:36 2015 -0400

    Pass stack to thread in resource_signal

    This is the only thread that gets started without an explicit reference to
    the stack. This prevents us from using a weakref in the resource, as it
    will cause the Stack's reference count to hit 0 before the thread is run.
    Now we explicitly pass a reference to the stack.

    Change-Id: Ie51be7b54d97ef184e401e395a7e7e3a26ce003b
    Related-Bug: #1454873