[R-SIG-Mac] Forking issues in Mavericks

[Simon Urbanek]

Jeroen,

actually, it works just fine for me on 10.9 (with CRAN build of R):

> library(parallel)
> library(httr)
> myfork <- mcparallel(GET("https://api.github.com/users/hadley/repos"))
> out <- mccollect(myfork)
> out
$`53129`
Response [https://api.github.com/users/hadley/repos]
  Status: 200
  Content-type: application/json; charset=utf-8
[{"id":12241750,"name":"adv-r","full_name":"hadley/adv-r","owner":{"login":"hadley","id":4196,"avatar_url":"https://2.gravatar.com/avatar/7ba164f40a50bc23dbb2aa825fb7bc16?d=https%3A%2F%2Fidenticons.gi
[...]

> sessionInfo()
R version 3.0.2 Patched (2013-10-23 r64103)
Platform: x86_64-apple-darwin10.8.0 (64-bit)

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] parallel  stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] httr_0.2

loaded via a namespace (and not attached):
[1] digest_0.6.3   RCurl_1.95-4.1 stringr_0.6.2  tools_3.0.2   

> system("uname -a")
Darwin ginaz.client.research.att.com 13.0.0 Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64 x86_64



BTW: if you really want to trace the crash, start the parent R and run this in lldb:

pro at -n R -w

that will attach to the forked child process.

Cheers,
Simon



On Oct 29, 2013, at 3:08 PM, Jeroen Ooms <jeroen.ooms at stat.ucla.edu> wrote:

> The following works in Linux and OSX 10.8 but in OSX 10.9 it results
> in a "__THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__()":
> 
> library(parallel)
> library(httr)
> myfork <- mcparallel(GET("https://api.github.com/users/hadley/repos"))
> out <- mccollect(myfork)
> 
> I've seen this error before when trying to access X11 from inside a
> forked process. In this case it seems to be related to SSL, but I'm
> not quite sure how to further debug this in 10.9 (lldb anyone?). What
> exactly might be triggering this error?
> 
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