Hi Andrew,
Any thoughts on how hard it would be to fix the problem, rather than
just minimizing it? Is it possible to wrap this section of code with a
directive that would cause it to get executed in a non-threaded fashion?
-Hazen
Maimone, Andrew wrote:
> Hello all,
>
> I would like suggest a patch to xwin.c to addresses a problem I am having.
> The problem is a synchronization issue between the plplot core and xwindows
> driver when multiple streams/windows are present. The events thread in
> xwin.c saves and restores the current stream to handle expose/resize events,
> but this can cause crashes if plplot changes the active stream (in the main
> program thread) in between the save/restore. I have modified the events_thread
> function to only save and restore the stream if necessary, rather than for all
> events to minimize the likelihood of this problem occurring.
>
> Best regards,
> Andrew
>
>
> diff xwin.svn xwin.c
> 1327,1328c1327,1328
> < /* As ResizeEH() ends up calling plRemakePlot(), that
> < * indirectly uses the current stream, one needs to
> ---
>> /* As ExposeEH() may or ResizeEH() will end up calling
>> plRemakePlot(),
>> * that indirectly uses the current stream, one needs to
> 1332,1333d1331
> < oplsc = plsc;
> < plsc = lpls;
> 1336a1335,1338
>> if( !dev->write_to_pixmap ) {
>> oplsc = plsc;
>> plsc = lpls;
>> }
> 1337a1340,1342
>> if( !dev->write_to_pixmap ) {
>> plsc = oplsc;
>> }
> 1339a1345,1346
>> oplsc = plsc;
>> plsc = lpls;
> 1340a1348
>> plsc = oplsc;
> 1343c1351
> < plsc = oplsc;
> ---
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