[Rd] Are Rprintf and REprintf thread-safe?

[Winston Chang]

Thanks - I'll find another way to send messages to the main thread for printing.

-Winston

On Tue, Nov 21, 2017 at 12:42 PM,  <luke-tierney at uiowa.edu> wrote:
> On Tue, 21 Nov 2017, Winston Chang wrote:
>
>> Is it safe to call Rprintf and REprintf from a background thread? I'm
>> working on a package that makes calls to fprintf(stderr, ...) on a
>> background thread when errors happen, but when I run R CMD check, it
>> says:
>>
>>  Compiled code should not call entry points which might terminate R nor
>>  write to stdout/stderr instead of to the console, nor the system RNG.
>>
>> Is it safe to replace these calls with REprintf()?
>
>
> Only if you enjoy race conditions or segfaults.
>
> Rprintf and REprintf are not thread-safe.
>
> Best,
>
> luke
>
>
>>
>> -Winston
>>
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>
> --
> Luke Tierney
> Ralph E. Wareham Professor of Mathematical Sciences
> University of Iowa                  Phone:             319-335-3386
> Department of Statistics and        Fax:               319-335-3017
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