Hi All,

I noticed today that there might be an issue with FLTK and the
csoundYieldCallback and if so if that might not be a source of issues
for hosts (i.e. MacCsound).  In InOut/widgets.cpp, if compiled without
fltk threading, the fl_run opcode has:

csound->SetYieldCallback(csound, CsoundYield_FLTK);

This also happens in csoundModuleInit in InOut/winFLTK.c.  As there's
only one yield callback, I imagine if a host sets one, then csound
goes to run, the FLTK yield callback is going to take the place of the
host one.

Could this be the source of the problem where MacCsound loses it's menus?

I also seem to have problems running FLTK GUI's with other hosts
(csound5gui, winsound) but each with different problems (the first
doesn't show the gui, the second has the GUI showing but winsound
becomes inactive).

If this is it, what would be a solution?  Allowing an array of
callbacks and adding or changing the method to appendYieldCallback?

steven

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