Several shutdown-related fixes #844

1. 
   sipa commented at 8:19 pm on February 15, 2012: member

   • do not let vnThreadsRunning[1] go negative
   • do not perform locking operations while vnThreadsRunning[1] is decreased
   • check vnThreadsRunning[1] at exit
2. Several shutdown-related fixes

   * do not let vnThreadsRunning[1] go negative
   * do not perform locking operations while vnThreadsRunning[1] is decreased
   * check vnThreadsRunning[1] at exit

   cc201e01f8
3. sipa referenced this in commit 999b4cacaf on Feb 16, 2012
4. sipa merged this on Feb 16, 2012
5. sipa closed this on Feb 16, 2012

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6. coblee referenced this in commit f1204d9314 on Jul 17, 2012
7. davispuh referenced this in commit ddcad36caa on Feb 18, 2014
8. destenson referenced this in commit aa9803473b on Jun 26, 2016
9. sipa referenced this in commit c020cbaa5c on Jul 14, 2021
10. DrahtBot locked this on Sep 8, 2021

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