Comment 12 for bug 1276694

Reviewed: https://review.openstack.org/111363
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=d795cfc5c89e9445148a48e9a0b9000485bc4ba3
Submitter: Jenkins
Branch: master

commit d795cfc5c89e9445148a48e9a0b9000485bc4ba3
Author: Jeff Peeler <email address hidden>
Date: Fri Aug 1 14:39:00 2014 -0400

    Fix signal handling for WSGI servers

    Previously, sending a SIGHUP to the parent process would close the
    shared socket used with all the WSGI servers (problematic when multiple
    workers are present). Also, exiting the wait loop in the parent would
    cause the children to be orphaned. Instead, make the parent process
    restart all the children servers upon receipt of SIGHUP. This behavior
    seems to make sense given that sending SIGHUP to a child restarts and
    creates a new server (due to the parent handling of the children).

    Another fix was to issue a SIGTERM upon Ctrl-C in order to not leave
    parentless children. SIGTERM was chosen instead of SIGINT simply to
    avoid worker tracebacks on the terminal.

    Minor unrelated change: the WSGI server in single worker mode has been
    changed to also respect the debug flag, exactly the same as with
    multiple workers.

    Note: the original bug report was examining lack of signal handling
    based on the Oslo service code. However, only the engine makes use of
    it.

    Change-Id: I8519cc6fedf72b38a8ce0762bb86cd70e58e0dc7
    Closes-bug: #1276694