GObjectSignalInvocationHint

struct GSignalInvocationHint {
  guint signal_id;
  GQuark detail;
  GSignalFlags run_type;
}

The GSignalInvocationHint structure is used to pass on additional information to callbacks during a signal emission.

`signal_id`	The signal id of the signal invoking the callback.
`detail`	The detail passed on for this emission.
`run_type`	The stage the signal emission is currently in, this field will contain one of `G_SIGNAL_RUN_FIRST`, `G_SIGNAL_RUN_LAST` or `G_SIGNAL_RUN_CLEANUP` and `G_SIGNAL_ACCUMULATOR_FIRST_RUN`. `G_SIGNAL_ACCUMULATOR_FIRST_RUN` is only set for the first run of the accumulator function for a signal emission.