Parallel processing fails on macOS about censusxy HOT 7 CLOSED

I'm not getting errors anymore either, and parallel processing appears to be working. Thanks for addressing this @chris-prener!

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Here is the error when this is run via Terminal:

objc[6659]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.
objc[6659]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

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thanks for submitting this - the issue appears to be with forked parallel processes on macOS. will continue investigating!

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quick update - had to update to macOS 12.4 but can replicate the issue. This is beyond censusxy - it has to do with how parallels::mclapply() function interfaces with the operating system. Unfortunately, since parallels is part of R core, it won't be patched as quickly I don't think. Will keep this open for now, but we'll need to explore whether this feature can be either changed to another function within parallels or whether we need to temporarily discontinue supporting parallel processing on UNIX machines.

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In addition to updating our documentation, we now return a specific error when this occurs that points users to the wesbite. I have also noticed that it is possible to restart your R session and get the code to execute correctly.

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OK @bernardlf - thanks for your patience - I've patched the Github version of the package to address this issue and am no longer getting errors on my local 12.4 install of macOS. Can you test the remotes::install_github("slu-openGIS/censusxy") version of the package out? Thanks!

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My pleasure! Thanks for using the package!

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