bufferevent_setwatermark
void bufferevent_setwatermark(struct bufferevent *bufev, short events,
bufferevent_setwatermark(bev2, EV_READ, 10, 20);
bufferevent_setwatermark(cs->write_event, EV_WRITE, CONTROL_BUFFER_LOW,
bufferevent_setwatermark(clt->clt_bev, EV_WRITE,
bufferevent_setwatermark(clt->clt_bev, EV_READ, 0, FCGI_CONTENT_SIZE);
bufferevent_setwatermark(clt->clt_srvbev, EV_READ, 0,
bufferevent_setwatermark(clt->clt_srvbev, EV_READ, 0,
bufferevent_setwatermark(bev, EV_WRITE,
bufferevent_setwatermark(con->se_in.bev, EV_WRITE,