[Swan-commit] Changes to ref refs/heads/master

[Andrew Cagney]

New commits:
commit 44c6a5ed0954ca642f0a5a153c0011d9c7d45432
Author: Andrew Cagney <cagney at gnu.org>
Date:   Thu Jun 7 13:56:37 2018 -0400

    pluto: add big 'exiting_pluto' flag, check in fetch and helper threads
    
    From the comment:
    
    The global EXITING_PLUTO is there as a hint to long running threads
    that they should also shutdown (it should be tested in the thread's
    main and some inner loops).  Just note that, on its own, it isn't
    sufficient.  Any long running threads will also need a gentle nudge
    (so that they loop around and detect the need to quit) and then a join
    to confirm that they have exited.
    
    Also avoid pthread_cancel() which can crash.