[jira] [Created] (ARROW-6977) [C++] Only enable jemalloc background_thread if feature is supported

["Neal Richardson (Jira)" <ji...@apache.org>]

Neal Richardson created ARROW-6977:
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             Summary: [C++] Only enable jemalloc background_thread if feature is supported
                 Key: ARROW-6977
                 URL: https://issues.apache.org/jira/browse/ARROW-6977
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
         Environment: macOS 10.14, Homebrew
            Reporter: Neal Richardson
             Fix For: 1.0.0


Followup to ARROW-6910. When loading the R package after that patch merged, I get this new message:

{code}
$ R
> library(arrow)
<jemalloc>: option background_thread currently supports pthread only

{code}

https://github.com/jemalloc/jemalloc/blob/3d84bd57f4954a17059bd31330ec87d3c1876411/src/background_thread.c#L884-L887 is where the message comes from. Tracing that further, {{have_background_thread}} comes from https://github.com/jemalloc/jemalloc/blob/21cfe59ff7b10a61dabe26cd3dbfb7a255e1f5e8/include/jemalloc/internal/jemalloc_preamble.h.in#L205-L211, which gets set in {{configure.ac}} here: https://github.com/jemalloc/jemalloc/blob/d2dddfb82aac9f2212922eb90324e84790704bfe/configure.ac#L2155-L2157

In sum, on my system, that flag doesn't get set, so {{have_background_thread}} is false, and when that is false and the {{background_thread}} option is true, I get that message printed. And I do not want to see that message.

cc [~wesm]



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