[tor-bugs] #16296 [Onionoo]: Implement lock file in a more robust way

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#16296: Implement lock file in a more robust way
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     Reporter:  karsten  |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:
    Component:  Onionoo  |    Version:
   Resolution:           |   Keywords:
Actual Points:           |  Parent ID:
       Points:           |
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Comment (by leeroy):

 How robust does it need to be? I ran into this when I '!^C' on the updater
 which left the lock file unreleased. This could perhaps also be solved by
 adding a shutdown hook on the updater's
 [https://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#addShutdownHook(java.lang.Thread)
 runtime]. Maybe try a snippet of both? Neither option is going to catch
 the unexpected system crash/reset. If you need it to be bulletproof it
 might be worthwhile to check the pid of running java VM (in addition).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16296#comment:1>
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