[tor-bugs] #26779 [Core Tor/Tor]: atomic_init() and friends failing on clang

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#26779: atomic_init() and friends failing on clang
------------------------------+--------------------------------
     Reporter:  mikeperry     |      Owner:  nickm
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.3.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  jenkins
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Clang does not like how we're using atomic_init() and friends in
 src/lib/thread/threads.h. It looks like these changes were introduced by
 nickm. I'm not finding a lot of great documentation on these functions,
 though.

 https://jenkins.torproject.org/job/tor-ci-linux-master-
 clang/3164/ARCHITECTURE=i386,SUITE=sid/consoleFulll
 https://jenkins.torproject.org/view/Failed+Unstable/job/tor-ci-
 linux-0.3.3-clang/lastFailedBuild/ARCHITECTURE=i386,SUITE=sid/console

 0.3.4 also, but lost the url in the jenkins maze.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26779>
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