[tor-bugs] #31843 [Circumvention/Snowflake]: Make safelogger thread safe

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#31843: Make safelogger thread safe
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     Reporter:  cohosh                   |      Owner:  cohosh
         Type:  defect                   |     Status:  assigned
     Priority:  Medium                   |  Milestone:
    Component:  Circumvention/Snowflake  |    Version:
     Severity:  Normal                   |   Keywords:
Actual Points:                           |  Parent ID:
       Points:                           |   Reviewer:
      Sponsor:                           |
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 It would be nice to pass the output of the safe logger to libraries so
 that we can log errors that occur in library functions. Right now the
 safelogger is not thread safe. Multiple calls to Write from different
 threads results in race conditions.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31843>
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