text: glview_get_vsync()
  Fetch the vsync setting.
  Synopsis:
  #include <glview/glview.h>
  GLVIEW_API int glview_get_vsync(int *vsync)
  Since:
  BlackBerry 10.0.0
  Arguments:
  - vsync
  The output parameter that the current vsync setting will be written to. This parameter cannot be NULL. A non-zero value indicates the number of video frames that will occur before the buffer is swapped. A zero value indicates that vsync is disabled.
  Library:libglview (For the qcc command, use the -l glview option to link against this library)
  Description:
  Fetch the current vsync setting. By default, vsync is enabled (set to 1).
  Returns:
  - EPERM: glview_intialize() was not called prior to glview_get_vsync().
  - EINVAL: output parameter is NULL.
  Last modified: 2014-09-30
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