/*
* Call function func with argument arg
* at some later time at software interrupt priority
*/
void
softcall(void (*func)(void *), void *arg)
{
softcall_t *sc;
clock_t w;
/*
* protect against cross-calls
*/
mutex_enter(&softcall_lock);
/* coalesce identical softcalls */
for (sc = softhead; sc != 0; sc = sc->sc_next) {
if (sc->sc_func == func && sc->sc_arg == arg) {
goto intr;
}
}
if ((sc = softfree) == 0)
panic("too many softcalls");
softfree = sc->sc_next;
sc->sc_func = func;
sc->sc_arg = arg;
sc->sc_next = 0;
if (softhead) {
softtail->sc_next = sc;
softtail = sc;
} else
softhead = softtail = sc;
intr:
if (softcall_state & SOFT_IDLE) {
softcall_state = SOFT_PEND;
softcall_tick = lbolt;
mutex_exit(&softcall_lock);
siron();
} else if (softcall_state & (SOFT_DRAIN|SOFT_PEND)) {
w = lbolt - softcall_tick;
if (w <= softcall_delay || ncpus == 1) {
mutex_exit(&softcall_lock);
return;
}
if (!(softcall_state & SOFT_STEAL)) {
softcall_state |= SOFT_STEAL;
/*
* We want to give some more chance before
* fishing around again.
*/
softcall_tick = lbolt;
}
/* softcall_lock will be released by this routine */
(void) softcall_choose_cpu();
}
}
/*
* Call function func with argument arg
* at some later time at software interrupt priority
*/
void
softcall(void (*func)(void *), void *arg)
{
softcall_t *sc;
clock_t w, now;
/*
* protect against cross-calls
*/
mutex_enter(&softcall_lock);
/* coalesce identical softcalls */
for (sc = softhead; sc != 0; sc = sc->sc_next) {
if (sc->sc_func == func && sc->sc_arg == arg) {
goto intr;
}
}
if ((sc = softfree) == 0)
panic("too many softcalls");
softfree = sc->sc_next;
sc->sc_func = func;
sc->sc_arg = arg;
sc->sc_next = 0;
if (softhead) {
softtail->sc_next = sc;
softtail = sc;
} else
softhead = softtail = sc;
intr:
if (softcall_state & SOFT_IDLE) {
softcall_state = SOFT_PEND;
softcall_tick = lbolt;
mutex_exit(&softcall_lock);
siron();
} else if (softcall_state & (SOFT_DRAIN|SOFT_PEND)) {
now = lbolt;
w = now - softcall_tick;
if (w <= softcall_delay || ncpus == 1) {
mutex_exit(&softcall_lock);
return;
}
/*
* Did we poke less than a second ago?
*/
if (now - softcall_lastpoke < hz) {
/*
* We did, increment the poke count and
* see if we are poking too often
*/
if (softcall_pokecount++ == 0)
softcall_countstart = now;
if (softcall_pokecount > softcall_pokemax) {
/*
* If poking too much increase the delay
*/
if (now - softcall_countstart <= hz)
softcall_delay++;
softcall_pokecount = 0;
}
} else {
/*
* poke rate has dropped off, reset the poke monitor
*/
softcall_pokecount = 0;
}
softcall_lastpoke = lbolt;
if (!(softcall_state & SOFT_STEAL)) {
softcall_state |= SOFT_STEAL;
/*
* We want to give some more chance before
* fishing around again.
*/
softcall_tick = lbolt;
}
/* softcall_lock will be released by this routine */
(void) softcall_choose_cpu();
}
}
