Re: [Plplot-devel] Problem with wxWidgets under MinGW-w64/MSYS2

[Alan W. I. <ir...@be...>]

On 2017-06-30 00:24-0700 Alan W. Irwin wrote:

> On 2017-06-29 19:52-0000 Arjen Markus wrote:
>> *** PLPLOT WARNING ***
>> wxPLViewer failed to signal it has found the shared memory [on the MinGW-w64/MSYS2 platform].

> I assume this issue is due to some programming error in my Windows
> variant of the 3-semaphores IPC approach.

Hi Arjen:

After reviewing the code, I spotted a fundamental error in the Windows
variant of the three-semaphores case which is that code used three
Windows mutexes rather than three named Windows semaphores. When I
originally coded that variant, I naively assumed that a two-state
semaphore was effectively the same as a mutex, but the semantics are
slightly different, and now that I have discovered named Windows
semaphores I would prefer to use them to keep the Windows variant of
the 3-semaphores approach as close as possible to the Posix variant of
this approach.  Therefore, I have now (commit b779495) addressed this
issue by using named Windows semaphores in the Windows variant of the
three semaphores approach, but I cannot even build test this modified
Windows variant of the three-semaphores approach here. So I need you
to do that.

To be specific about what test I want you to run, please freshly configure
PLplot with the -DPLPLOT_WX_DEBUG_OUTPUT=ON option (which adds lots of
useful information if there are any remaining errors with the
three-semaphores approach).

As per usual, the cmake stdout and stderr output should be captured with

cmake <cmake options> <directory corresponding to top of source tree> >& cmake.out

Then do the following:

# Build prerequisites
make VERBOSE=1 wxwidgets >& wxwidgets.out
make VERBOSE=1 wxPLViewer >& wxPLViewer.out
make VERBOSE=1 x00c >& x00c.out

# Run test

examples/c/x00c -dev wxwidgets >& test.out

Then, please send me those 5 *.out files if there are any issues
captured by any of them.  But I assume you won't have to do that
because there will be no issues.  :-)

By the way, Happy Canada Day everybody!

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________

Linux-powered Science
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