Re: wxt term + osx

[Allin C. <cot...@wf...>]

On Wed, 26 Aug 2015, Ethan A Merritt wrote:

> On Wednesday, 26 August, 2015 17:33:27 Allin Cottrell wrote:
>>
>> I think there may be an antecedent problem here in relation to
>> wxWidgets. In wxt_gui.h we have:
>>
>> #ifndef WXT_MONOTHREADED
>> #if defined(__WXGTK__)
>> # define WXT_MULTITHREADED
>> #elif defined(__WXMSW__) || defined(__WXMAC__)
>> # define WXT_MONOTHREADED
>> #else
>> # error "wxt does not know if this platform has to be single- or
>> multi-threaded"
>> #endif
>> #endif
>>
>> Now, as I understand it, WXT_MONOTHREADED is defined when this code is
>> first reached if and only if the user has deployed the configure
>> option --with-wx-single-threaded (described with "do not use
>> multithreaded wxgtk even if available"). In my gnuplot build I did not
>> use that option; it's not applicable since my wxWidgets on OS X does
>> not use GTK, it's cocoa. Therefore we proceed within the cpp block,
>> and we skip 'if defined(__WXGTK__)'.
>>
>> But then what happens? If __WXMAC__ is defined gnuplot then defines
>> WXT_MONOTHREADED, but why? My build of wxWidgets 3.0.2 defines
>> __WXMAC__, and __WXOSX_COCOA__, and wxUSE_THREADS, so it seems an
>> incorrect assumption is being made here.
>
> I cannot reconstruct when/why the gnuplot code assumes that
> wx on OSX must be single threaded.
> Maybe it was true for some earlier OSX versions but the restriction
> was later relaxed?
> Maybe it is true for wx+carbon but not for wx+cocoa?
> Maybe it is not true in general, but gnuplot breaks the
> threading model (event loop is in secondary not primary thread)?
> Maybe it was always wrong but it was added in an attempt to
> fix a problem that was ultimately due to something else?
>
> Anyhow, if you can confirm that it works in multithread mode
> also, I'd be happy to remove that assumption from wxt_gui.h.

I was hoping it would be that simple -- i.e. make gnuplot define 
WXT_MULTITHREADED conditional on some feature of my case and all 
would be well -- but I'm afraid that didn't work out: when I did 
that, gnuplot crashed when I tried to activate the wxt terminal.

I'll try to get some more information about this, but gdb doesn't 
seem to be included among the OS X "command line tools".

Allin Cottrell