issleep
if(issleep(&sp->flags, &sp->io_mtx, 0, "iscproc", hz*30) == EWOULDBLOCK) {
issleep(&sp->soc, &sp->io_mtx, 0, "iscstpc", 5*hz);
issleep(&sp->soc, &sp->io_mtx, 0, "iscstpc", hz);
issleep(&sp->rsp, &sp->rsp_mtx, 0, "isc_rsp", hz*10);