Enter the GTK+ event loop.
gnocl::mainLoop [-option value...]
After calling the gnocl::mainLoop the GTK+ event loop is entered. This command
does not return!
Timeout is the time in milliseconds the Tcl event loop is checked.
If timeout is equal to zero, the Tcl event loop is never called. In
this case several Tcl commands like vwait or after do not work any more.