Function mozjs::jsapi::SetGCSliceCallback

pub unsafe extern "C" fn SetGCSliceCallback(
    cx: *mut JSContext,
    callback: Option<unsafe extern "C" fn(_: *mut JSContext, _: GCProgress, _: *const GCDescription)>,
) -> Option<unsafe extern "C" fn(_: *mut JSContext, _: GCProgress, _: *const GCDescription)>

The GC slice callback is called at the beginning and end of each slice. This callback may be used for GC notifications as well as to perform additional marking.