On 6/8/22 18:39, John Fox wrote:
On 2022-06-08 12:36 p.m., John Fox wrote:
Dear Thomas,
Thanks for this additional information.
I added some of my own defensive code to the development version of
the Rcmdr package, to set the "help_type" option to "text" for macOS.
I'll
I should have added that help_type is set to "text" for R version
4.2.0 only!
I think it is a coincidence that this was seen in R 4.2.0. The http
server's handler has a safeguard against re-entrant execution since
59338 (year 2012). As that safeguard was needed at that time for clients
connecting in rapid sequence, the problem with the live-lock with tcltk
event loop could have been triggered already then, but probably nobody
ran into this with tcltk package loaded. PR#17773 shows that attempts
for re-entrant/concurrent handling of http requests were seen in R 4.0.0
with the HTML help.
Best
Tomas
modify that to all non-Windows platforms, and also include this in
the CRAN version of the package.
I currently test on macOS and Windows systems but when I have a
chance will get a Linux system working as well.
Best,
John
On 2022-06-08 12:16 p.m., Tomas Kalibera wrote:
For reference, this problem is not macOS specific, it also exists on
Linux (but not on Windows which use a different code path) and the
core problem is how to prevent re-entrant execution of R event
handlers when run from the R/tcltk event loop, itself running from
an R event handler.
R-patched now contains a defensive work-around from Simon.
We have added a more efficient and cleaner fix to R-devel, but there
is some risk of breakage: this form is "the documented way" but
didn't work on some systems ~22 years ago. So it would be great if
people using Tcl/Tk in R on Unix, and particularly those with rarely
used window managers, could test their applications or the tcltk
package demos and report any issues well before the next release.
Thanks
Tomas
On 5/30/22 01:27, John Fox wrote:
Dear Simon,
Thank you for addressing this problem so promptly.
Best,
John
On 2022-05-29 6:51 p.m., Simon Urbanek wrote:
Actually, I take back the reference to the commit - the deadlock
is true, and removing the line is a work-around, but r78421 was
not necessarily the regression. The issue seems to be caused by a
combination of Tcl/Tk and KaTeX (the latter causes the browser to
issue multiple parallel http-requests and the former causes the
deadlock in its event loop) which has not been there in earlier R
versions.
Cheers,
Simon
On 30/05/2022, at 10:09 AM, Simon Urbanek
<simon.urba...@r-project.org> wrote:
John,
thanks, this is a regression caused by r78421 (deadlock when
TclTk's event loop is called in http processing). Removing L875
in src/modules/internet/Rhttpd.c restores the previous behavior,
but the underlying problem is more complex and will require more
investigation.
Cheers,
Simon
On 29/05/2022, at 5:36 AM, John Fox <j...@mcmaster.ca> wrote:
Dear R-sig-mac list members,
I've discovered that loading the tcltk package apparently causes
R 4.2.0 (including the current patched version) to hang on an M1
Mac.
Try, e.g.,
library("tcltk")
help("lm")
My session info:
------- snip -------
sessionInfo()
R version 4.2.0 Patched (2022-05-28 r82413)
Platform: aarch64-apple-darwin20 (64-bit)
Running under: macOS Monterey 12.3.1
Matrix products: default
BLAS:
/Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/lib/libRblas.0.dylib
LAPACK:
/Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/lib/libRlapack.dylib
locale:
[1] 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] tcltk stats graphics grDevices utils datasets methods
[8] base
loaded via a namespace (and not attached):
[1] compiler_4.2.0
------- snip -------
Some additional details: The problem occurs both in the R macOS
console and, if options(help_type="html"), when R is run in a
terminal window on macOS, but not when
options(help_type="text"). The former is the default in the Mac
R console, the latter when R is run in a terminal.
The problem is apparently new in R 4.2.0 -- it doesn't, e.g.,
occur in R 4.1.3. My apologies for not turning it up earlier.
I discovered the problem when accessing help in the Rcmdr GUI,
which uses tcltk, caused R to hang.
Has anyone else encountered this problem?
Best,
John
--
John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
web: https://socialsciences.mcmaster.ca/jfox/
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