Commits on Jul 13, 2017

1. Use a shared MultiAgent in CurlHandler when using LibreSSL backend on… …

   … macOS
   
   LibreSSL needs locks initialized in order to be used safely from
   multiple threads, which happens when multiple HttpClients are used.  But
   we don't currently have a good way to perform that initialization as we
   do for OpenSSL.  As a workaround, add a shared MultiAgent that's
   initialized when LibreSSL is used on macOS, and use that same MultiAgent
   from all CurlHandler instances rather than giving each their own.  Since
   MultiAgent is 1:1 with a thread, all HttpClient's will then end up
   sharing the same libcurl event loop thread, and we'll serialize all of
   our interactions with libcurl and thus hopefully with LibreSSL.

   

   stephentoub committed Jul 13, 2017
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