smb_sleep
smb_sleep(evp, SMB_IOD_EVINTERLOCK(iod), PDROP, "90evw", 0);
smb_sleep(&iod->iod_muxwant, SMB_IOD_RQINTERLOCK(iod), 0, "90mux", 0);
smb_sleep(rqp, SMB_IOD_RQINTERLOCK(iod), 0, "90xrm", 0);
smb_sleep(&rqp->sr_state, SMBRQ_INTERLOCK(rqp), 0, "90wrq", 0);
smb_sleep(&ssp->ss_vcgenid, SMBS_ST_INTERLOCK(ssp),
int smb_sleep(void *chan, struct smb_slock *sl, int slpflags, const char *wmesg, int timo);