[Rd] Are Rprintf and REprintf thread-safe?

luke-tierney at uiowa.edu luke-tierney at uiowa.edu
Tue Nov 21 19:42:15 CET 2017

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.



> -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
    Actuarial Science
241 Schaeffer Hall                  email:   luke-tierney at uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu

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