Needs a call to R_CheckUserInterrupt at the appropriate place. The
only platform that currently can interrupt a long print seems to be
Rgui on Windows because of an event poll in the console output
function. One possibility is to put in a check every 100 calls, say,
to Rvprintf in printutils.c. I'll check that out and commit to the
patches branch unless anyone sees a problem or a better place to
check.
luke
On Fri, 10 Oct 2003, Martin Maechler wrote:
> NEWS for R 1.8.0 has
>
> >> USER-VISIBLE CHANGES
> >>
> >> <......>
> >>
> >> o On Unix-like systems interrupt signals now set a flag that is
> >> checked periodically rather than calling longjmp from the
> >> signal handler. This is analogous to the behavior on Windows.
> >> This reduces responsiveness to interrupts but prevents bugs
> >> caused by interrupting computations in a way that leaves the
> >> system in an inconsistent state. It also reduces the number
> >> of system calls, which can speed up computations on some
> >> platforms and make R more usable with systems like Mosix.
>
> and this has already caused grief here
> (actually it has several days ago, when I switched our users to
> R-1.8.0beta __ BUT THEY DIDN'T TELL ANY R DEVELOPER __ )
>
> for a user who does use *large* matrices.
>
> When accidentally calling print() {implicitly}, we have been
> used here to press CTRL+c (twice in Emacs ESS!) for stopping the
> output.
>
> This no longer works in R 1.8.0 at least on our unix platforms.
> To reproduce, type
>
> cbind(1:1e6)
>
> and try to cut it short (it only takes a minute or so,
> whereas our user here had a matrix that needed more than 10
> minutes of screen output !)
>
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--
Luke Tierney
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: [EMAIL PROTECTED]
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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