static void
random_kthread(void)
{
u_int maxloop, ring_out, i;
/*
* Locking is not needed as this is the only place we modify ring.out, and
* we only examine ring.in without changing it. Both of these are volatile,
* and this is a unique thread.
*/
for (random_kthread_control = 1; random_kthread_control;) {
/* Deal with events, if any. Restrict the number we do in one go. */
maxloop = RANDOM_RING_MAX;
while (harvest_context.hc_entropy_ring.out != harvest_context.hc_entropy_ring.in) {
ring_out = (harvest_context.hc_entropy_ring.out + 1)%RANDOM_RING_MAX;
random_harvestq_fast_process_event(harvest_context.hc_entropy_ring.ring + ring_out);
harvest_context.hc_entropy_ring.out = ring_out;
if (!--maxloop)
break;
}
random_sources_feed();
/* XXX: FIX!! Increase the high-performance data rate? Need some measurements first. */
for (i = 0; i < RANDOM_ACCUM_MAX; i++) {
if (harvest_context.hc_entropy_fast_accumulator.buf[i]) {
random_harvest_direct(harvest_context.hc_entropy_fast_accumulator.buf + i, sizeof(harvest_context.hc_entropy_fast_accumulator.buf[0]), 4, RANDOM_FAST);
harvest_context.hc_entropy_fast_accumulator.buf[i] = 0;
}
}
/* XXX: FIX!! This is a *great* place to pass hardware/live entropy to random(9) */
tsleep_sbt(&harvest_context.hc_kthread_proc, 0, "-", SBT_1S/10, 0, C_PREL(1));
}
wakeup(&harvest_context.hc_kthread_proc);
kproc_exit(0);
/* NOTREACHED */
}
static void
logtimeout(void *arg)
{
if (!log_open)
return;
if (msgbuftrigger == 0)
goto done;
msgbuftrigger = 0;
selwakeuppri(&logsoftc.sc_selp, LOG_RDPRI);
KNOTE_LOCKED(&logsoftc.sc_selp.si_note, 0);
if ((logsoftc.sc_state & LOG_ASYNC) && logsoftc.sc_sigio != NULL)
pgsigio(&logsoftc.sc_sigio, SIGIO, 0);
cv_broadcastpri(&log_wakeup, LOG_RDPRI);
done:
if (log_wakeups_per_second < 1) {
printf("syslog wakeup is less than one. Adjusting to 1.\n");
log_wakeups_per_second = 1;
}
callout_reset_sbt(&logsoftc.sc_callout,
SBT_1S / log_wakeups_per_second, 0, logtimeout, NULL, C_PREL(1));
}
/*ARGSUSED*/
static int
logopen(struct cdev *dev, int flags, int mode, struct thread *td)
{
if (log_wakeups_per_second < 1) {
printf("syslog wakeup is less than one. Adjusting to 1.\n");
log_wakeups_per_second = 1;
}
mtx_lock(&msgbuf_lock);
if (log_open) {
mtx_unlock(&msgbuf_lock);
return (EBUSY);
}
log_open = 1;
callout_reset_sbt(&logsoftc.sc_callout,
SBT_1S / log_wakeups_per_second, 0, logtimeout, NULL, C_PREL(1));
mtx_unlock(&msgbuf_lock);
fsetown(td->td_proc->p_pid, &logsoftc.sc_sigio); /* signal process only */
return (0);
}