FWPRI
err = tsleep(ir, FWPRI, "fw_read", hz);
err = tsleep(it, FWPRI, "fw_write", hz);
if ((err = tsleep(xfer, FWPRI, "asyreq", hz)) != 0)
tsleep((void *)&sleepch, FWPRI, "fwitxd", hz);
tsleep((void *)&sleepch, FWPRI, "fwirxd", hz);
tsleep(&i, FWPRI, "sbpdtc", hz/2);