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
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