static void *
vwp_main(void *priv)
{
int v;
struct vwp *vwp;
struct waiter *w;
struct waited *wp;
double now, then;
int i;
THR_SetName("cache-poll");
CAST_OBJ_NOTNULL(vwp, priv, VWP_MAGIC);
w = vwp->waiter;
while (1) {
then = Wait_HeapDue(w, &wp);
if (wp == NULL)
i = -1;
else
i = (int)floor(1e3 * (then - VTIM_real()));
assert(vwp->hpoll > 0);
AN(vwp->pollfd);
v = poll(vwp->pollfd, vwp->hpoll, i);
assert(v >= 0);
now = VTIM_real();
if (vwp->pollfd[0].revents)
v--;
for (i = 1; i < vwp->hpoll;) {
VSL(SLT_Debug, vwp->pollfd[i].fd, "POLL loop i=%d revents=0x%x", i, vwp->pollfd[i].revents);
assert(vwp->pollfd[i].fd != vwp->pipes[0]);
wp = vwp->idx[i];
CHECK_OBJ_NOTNULL(wp, WAITED_MAGIC);
if (v == 0 && Wait_HeapDue(w, NULL) > now)
break;
if (vwp->pollfd[i].revents)
v--;
then = Wait_When(wp);
if (then <= now) {
Wait_HeapDelete(w, wp);
Wait_Call(w, wp, WAITER_TIMEOUT, now);
vwp_del(vwp, i);
} else if (vwp->pollfd[i].revents & POLLIN) {
assert(wp->fd > 0);
assert(wp->fd == vwp->pollfd[i].fd);
Wait_HeapDelete(w, wp);
Wait_Call(w, wp, WAITER_ACTION, now);
vwp_del(vwp, i);
} else {
i++;
}
}
if (vwp->pollfd[0].revents)
vwp_dopipe(vwp);
}
NEEDLESS_RETURN(NULL);
}
static void *
vws_thread(void *priv)
{
struct waited *wp;
struct waiter *w;
struct vws *vws;
double now, then;
struct timespec ts;
const double max_t = 100.0;
port_event_t ev[MAX_EVENTS];
u_int nevents;
int ei, ret;
CAST_OBJ_NOTNULL(vws, priv, VWS_MAGIC);
w = vws->waiter;
CHECK_OBJ_NOTNULL(w, WAITER_MAGIC);
THR_SetName("cache-ports");
now = VTIM_real();
while (!vws->die) {
while (1) {
then = Wait_HeapDue(w, &wp);
if (wp == NULL) {
vws->next = now + max_t;
break;
} else if (then > now) {
vws->next = then;
break;
}
CHECK_OBJ_NOTNULL(wp, WAITED_MAGIC);
vws_del(vws, wp->fd);
Wait_Call(w, wp, WAITER_TIMEOUT, now);
}
then = vws->next - now;
ts.tv_sec = (time_t)floor(then);
ts.tv_nsec = (long)(1e9 * (then - ts.tv_sec));
/*
* min number of events we accept. could consider to scale up
* for efficiency, but as we always get all waiting events up to
* the maximum, we'd only optimize the idle case sacrificing
* some latency
*/
nevents = 1;
/*
* see disucssion in
* - https://issues.apache.org/bugzilla/show_bug.cgi?id=47645
* - http://mail.opensolaris.org/pipermail/\
* networking-discuss/2009-August/011979.html
*
* comment from apr/poll/unix/port.c :
*
* This confusing API can return an event at the same time
* that it reports EINTR or ETIME.
*
*/
ret = port_getn(vws->dport, ev, MAX_EVENTS, &nevents, &ts);
now = VTIM_real();
if (ret < 0 && errno == EBADF) {
/* close on dport is our stop signal */
AN(vws->die);
break;
}
if (ret < 0)
assert((errno == EINTR) || (errno == ETIME));
for (ei = 0; ei < nevents; ei++)
vws_port_ev(vws, w, &ev[ei], now);
}
return NULL;
}
static void *
vwe_thread(void *priv)
{
struct epoll_event ev[NEEV], *ep;
struct waited *wp;
struct waiter *w;
double now, then;
int i, n, active;
struct vwe *vwe;
char c;
CAST_OBJ_NOTNULL(vwe, priv, VWE_MAGIC);
w = vwe->waiter;
CHECK_OBJ_NOTNULL(w, WAITER_MAGIC);
THR_SetName("cache-epoll");
THR_Init();
now = VTIM_real();
while (1) {
while (1) {
Lck_Lock(&vwe->mtx);
/*
* XXX: We could avoid many syscalls here if we were
* XXX: allowed to just close the fd's on timeout.
*/
then = Wait_HeapDue(w, &wp);
if (wp == NULL) {
vwe->next = now + 100;
break;
} else if (then > now) {
vwe->next = then;
break;
}
CHECK_OBJ_NOTNULL(wp, WAITED_MAGIC);
AZ(epoll_ctl(vwe->epfd, EPOLL_CTL_DEL, wp->fd, NULL));
vwe->nwaited--;
AN(Wait_HeapDelete(w, wp));
Lck_Unlock(&vwe->mtx);
Wait_Call(w, wp, WAITER_TIMEOUT, now);
}
then = vwe->next - now;
i = (int)ceil(1e3 * then);
assert(i > 0);
Lck_Unlock(&vwe->mtx);
do {
/* Due to a linux kernel bug, epoll_wait can
return EINTR when the process is subjected to
ptrace or waking from OS suspend. */
n = epoll_wait(vwe->epfd, ev, NEEV, i);
} while (n < 0 && errno == EINTR);
assert(n >= 0);
assert(n <= NEEV);
now = VTIM_real();
for (ep = ev, i = 0; i < n; i++, ep++) {
if (ep->data.ptr == vwe) {
assert(read(vwe->pipe[0], &c, 1) == 1);
continue;
}
CAST_OBJ_NOTNULL(wp, ep->data.ptr, WAITED_MAGIC);
Lck_Lock(&vwe->mtx);
active = Wait_HeapDelete(w, wp);
Lck_Unlock(&vwe->mtx);
if (!active) {
VSL(SLT_Debug, wp->fd, "epoll: spurious event");
continue;
}
AZ(epoll_ctl(vwe->epfd, EPOLL_CTL_DEL, wp->fd, NULL));
vwe->nwaited--;
if (ep->events & EPOLLIN)
Wait_Call(w, wp, WAITER_ACTION, now);
else if (ep->events & EPOLLERR)
Wait_Call(w, wp, WAITER_REMCLOSE, now);
else if (ep->events & EPOLLHUP)
Wait_Call(w, wp, WAITER_REMCLOSE, now);
else
Wait_Call(w, wp, WAITER_REMCLOSE, now);
}
if (vwe->nwaited == 0 && vwe->die)
break;
}
closefd(&vwe->pipe[0]);
closefd(&vwe->pipe[1]);
closefd(&vwe->epfd);
return (NULL);
}
