[Rcpp-devel] Distribution functions threadsafe in RcppParallel?

[Yixuan Qiu]

For your information, here is a header-only library for distribution
functions: https://github.com/kthohr/stats

The API seems to be designed to mimic the R API.


Best,
Yixuan

2018-04-15 23:56 GMT-04:00 Murray Efford <murray.efford at gmail.com>:

> Thanks. This is all happening inside a package for CRAN, so I would rather
> avoid more complexity and potential platform-dependence, but I also cannot
> afford for it to break unpredictably (or otherwise).
> Murray
>
> On Mon, Apr 16, 2018 at 3:33 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
>
>>
>> On 16 April 2018 at 13:41, Murray Efford wrote:
>> | I read in the RcppParallel blurb "The code that you write within
>> parallel
>> | workers should not call the R or Rcpp API in any fashion", which is
>> | admirably clear. However, it leaves me without threadsafe access to
>> | distribution functions (dpois, dbinom etc.). In practice, so far, these
>> R
>> | API calls seem to work for me, but can they be trusted? Is there an
>> | alternative?
>>
>> That's a fair question. They may work, as they are also exposed /
>> available
>> via the standalone R math library (see Writing R Extensions).
>>
>> As such, they may not required memory allocations or other interactions
>> with
>> the R process and hence "not call R ... in any fashion" per the above.
>>
>> But we can't say for sure. If you want to be safe, maybe stick to
>> equivalent functions from a non-R source: C++11, Boost, ...
>>
>> Dirk
>>
>> | (It seems this question must have arisen before, but I haven't found an
>> | answer)
>>
>> --
>> http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>>
>
>
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-- 
Yixuan Qiu <yixuanq at gmail.com <yixuan.qiu at cos.name>>
Department of Statistics,
Purdue University
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