[R-SIG-Mac] hang on use of ESC in R 2.6.2

Charles Hebert charles.hebert at gmail.com
Tue Feb 12 16:43:00 CET 2008

> If R is stuck in a long computation in C code that doesn't call
> R_ProcessEvents, we're helpless. There is no way to stop that code
> until it finishes. Even if you press <Esc> it may not help (just give
> you the beachball), because the event of you pressing <Esc> must first
> be processed so it can fire,

Command :

then I press <Esc>

reproduced the problem. It's not link to the computational time.

Best regards, C.


Mac Intel - OS 10.5.1 / 10.5.2

 > sessionInfo()
R version 2.6.2 (2008-02-08)


attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

>  desire so to find out what R is doing.
> To do so, start a Terminal (in parallel to your unresponsive R) and
> type:
> gdb
> attach R
> That should get you into the R process that is spinning. Now you can
> issue
> bt
> to see where it really is. Very likely it will be somewhere is the
> package performing the computation. But if it's not, then we want to
> know.
> Anyway, I suspect that this is not really something we can do much
> about (in the current GUI). The new GUI 2.0 is running R in a separate
> thread, so it is always responsive despite R being busy, hence we can
> deal better with unresponsive R there.
> Cheers,
> Simon
> On Feb 10, 2008, at 10:53 AM, Ken Knoblauch wrote:
>> Hi,
>> I notice with R 2.6.2 on a powerpc and on a MacBook Pro that if I
>> hit ESC to
>> annul running a line in the GUI, input hangs with the spinning beach
>> ball
>> for an indefinite period of time.  I haven't tried to see how long
>> it will
>> hang, but
>> it is at least several minutes too long.  Checking Force Quit
>> indicates that
>> R is not responding.
>> On the power pc, w/ Tiger (but the same thing happens on my Intel
>> Mac w/
>> Leopard)
>> sessionInfo()
>> R version 2.6.2 (2008-02-08)
>> powerpc-apple-darwin8.10.1
>> locale:
>> en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>> Thanks.
>> best,
>> Ken

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