Re: [Rd] problems with connections when applied in tryCatch

From: Joris Meys <jorismeys_at_gmail.com>
Date: Tue, 23 Aug 2011 12:57:40 +0200

Bug committed with number 14660
Cheers
Joris

2011/8/22 Uwe Ligges <ligges_at_statistik.tu-dortmund.de>:
>
>
> On 18.08.2011 17:53, Joris Meys wrote:
>>
>> Recently on stackoverflow following problem came up :
>>
>>
>> http://stackoverflow.com/questions/7103429/all-the-connections-are-in-use-execution-halted/7108799#7108799
>>
>> A reproducible example: When trying
>>
>> replicate(200,tryCatch(read.table("this.is.no.file"),
>>           warning=function(w){print(showConnections());print("warning")}))
>>
>> No connections are shown, but after a number of calls, suddenly the
>> message
>>
>> Error in file(file, "rt") : all connections are in use
>>
>> pops up. Trying to get them deleted with closeAllConnections() causes
>> R to crash on Windows 7. Another user reported a segfault. (see the
>> link to stackoverflow)
>>
>> Although I initially thought on.exit() was somehow skipped, that's not
>> the case. In fact, the connection couldn't be opened, so it can't be
>> closed either. I have no clue as to why this goes wrong, but it shows
>> there's something odd happening with the connections. For the record,
>> I am aware that the use of the warning handler in that call is rather
>> peculiar. But even then, R shouldn't crash.
>
> Right, and not trivial to track down! At least I can reproduce it with
> R-devel under Windows Server 2008. Can you please file a bug report so it
> won't be forgotten.
>
> Thanks,
> Uwe Ligges
>
>
>
>> Cheers
>> Joris
>>
>>
>

-- 
Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

tel : +32 9 264 59 87
Joris.Meys_at_Ugent.be
-------------------------------
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