static int
devi_notify(resmgr_context_t *ctp, io_notify_t *msg, RESMGR_OCB_T *ocb)
{
devi_attr_t *attr = ocb->ocb.attr;
event_bus_line_t *line = attr->line;
int trig = 0, n;
int sts;
/* we don't support output or out of band notification */
if (msg->i.flags & (_NOTIFY_COND_OBAND | _NOTIFY_COND_OUTPUT))
return (ENOSYS);
pthread_mutex_lock(&line->mutex);
/* if queue non-empty, trigger */
if (ocb->read_ptr != line->head)
trig = _NOTIFY_COND_INPUT;
pthread_mutex_unlock(&line->mutex);
sts = iofunc_notify(ctp, msg, attr->notify, trig, NULL, &n);
if (sts == EBUSY)
return (EBUSY);
if (n)
attr->flags |= DEVI_NOTIFICATION_ARMED;
return (_RESMGR_NPARTS(1));
}
int
io_notify(resmgr_context_t *ctp, io_notify_t *msg, struct ocb *ocb) {
MQDEV *dev = ocb->ocb.attr;
int status, n, trig, notifycnts[3] = {1, 1, 1};
// Calculate which sources are statisfied (immediate trigger).
trig = 0;
if(dev->mq_attr.mq_curmsgs) {
trig |= _NOTIFY_COND_INPUT;
}
if(dev->mq_attr.mq_maxmsg - dev->mq_attr.mq_curmsgs > 0) {
trig |= _NOTIFY_COND_OUTPUT;
}
//
// Process the notify request.
// "n" will be set to 1 if a notify entry is armed.
//
status = iofunc_notify(ctp, msg, &dev->notify[0], trig, notifycnts, &n);
/*
Tie the ocb which attached the nofication. On close we'll need
this to determine if the close() should remove the notification
PR 1207
*/
if (n)
ocb->notify_attached++;
else
ocb->notify_attached--;
//
// Since the messages can't change under our feet we don't need to
// recheck them like we did in chario which has async input from
// an interrupt handler.
//
return status;
}
