SetRunState
void SetRunState(run_state state);
SetRunState( BMediaEventLooper::B_STARTED );
SetRunState(B_STOPPED);
SetRunState(B_QUITTING);
SetRunState(B_TERMINATED);
SetRunState(B_STARTED);
SetRunState(B_STOPPED);
((BMediaEventLooper *)arg)->SetRunState(B_STOPPED);
((BMediaEventLooper *)arg)->SetRunState(B_QUITTING);