On Tuesday 29 November 2005 14:12, Victor Lazzarini wrote:

> If I delete libwidgets.dylib, csPlay works. Would it be something
> to do with the setting of the yield callback in winFLTK.cpp?

Possibly, although it is still not clear how. I see this code
in winFLTK.c:

void set_display_callbacks(CSOUND *csound)
{
#ifdef LINUX
    Display *dpy = XOpenDisplay(NULL);
    if (dpy == NULL)
      return;
    XCloseDisplay(dpy);
#endif
#ifdef NO_FLTK_THREADS
    csound->SetYieldCallback(csound, CsoundYield_FLTK);
#endif
    if (csound->SetIsGraphable(csound, 1) != 0)
      return;
    if (!csound->oparms->displays)
      return;
    if (csound->oparms->graphsoff || csound->oparms->postscript)
      return;
#ifndef NO_FLTK_THREADS
    csound->SetYieldCallback(csound, CsoundYield_FLTK);
#endif
    ...

and this one in FL_graph.cpp:

  int CsoundYield_FLTK(CSOUND *csound)
  {
#ifndef NO_FLTK_THREADS
    /* nothing to do, unless no widget thread is running */
    if (csound->QueryGlobalVariable(csound, "_widgets_globals") != NULL)
      return 1;
#endif
    lock(csound);
    Fl::wait(0.0);
    unlock(csound);
    return 1;
  }

Is it possible that calling Fl::lock(), Fl::wait(), and Fl::unlock()
causes the problem ? Other than that, there seems to be no important
difference (that is, as long as you do not actually use graphs or
widget opcodes), unless your code also sets a yield callback which
may be replaced by the widgets plugin.


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