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

[Arjen M. <Arj...@de...>]

Hi Alan,



> -----Original Message-----
> From: Alan W. Irwin [mailto:ir...@be...]
> Sent: Saturday, July 01, 2017 11:08 PM
>
> 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.

I rebuilt PLplot using this latest commit and it all worked fine :). So the three-semaphores approach you have now implemented was the right way. I will try and see whether I can get the same result with the MSVC compiler.

>
> 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).
>
Unless you think this is necessary, given the completely positive results, I will concentrate on MSVC.

Regards,

Arjen

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