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*** empty log message ***

master
Marc Alexander Lehmann 1 year ago
parent
commit
a5aa9f38e4
  1. 50
      ev_iouring.c

50
ev_iouring.c

@ -230,10 +230,8 @@ evsys_io_uring_enter (int fd, unsigned to_submit, unsigned min_complete, unsigne
#define EV_SQES ((struct io_uring_sqe *) iouring_sqes)
#define EV_CQES ((struct io_uring_cqe *)((char *)iouring_cq_ring + iouring_cq_cqes))
/* TODO: this is not enough, we might have to reap events */
/* TODO: but we can't, as that will re-arm events, causing */
/* TODO: an endless loop in fd_reify */
static int
inline_speed
int
iouring_enter (EV_P_ ev_tstamp timeout)
{
int res;
@ -252,29 +250,39 @@ iouring_enter (EV_P_ ev_tstamp timeout)
return res;
}
/* TODO: can we move things around so we don't need this forward-reference? */
static void
iouring_poll (EV_P_ ev_tstamp timeout);
static
struct io_uring_sqe *
iouring_sqe_get (EV_P)
{
unsigned tail = EV_SQ_VAR (tail);
while (ecb_expect_false (tail + 1 - EV_SQ_VAR (head) > EV_SQ_VAR (ring_entries)))
unsigned tail;
for (;;)
{
/* queue full, need to flush */
tail = EV_SQ_VAR (tail);
if (ecb_expect_true (tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries)))
break; /* whats the problem, we have free sqes */
/* queue full, need to flush and possibly handle some events */
#if EV_FEATURE_CODE
/* first we ask the kernel nicely, most often this frees up some sqes */
int res = iouring_enter (EV_A_ EV_TS_CONST (0.));
/* io_uring_enter might fail with EBUSY and won't submit anything */
/* unfortunately, we can't handle this at the moment */
ECB_MEMORY_FENCE_ACQUIRE; /* better safe than sorry */
if (res < 0 && errno == EBUSY)
/* the sane thing might be to resize, but we can't */
//TODO
ev_syserr ("(libev) io_uring_enter could not clear sq");
else
break;
/* iouring_poll should have done ECB_MEMORY_FENCE_ACQUIRE */
if (res >= 0)
continue; /* yes, it worked, try again */
#endif
/* some problem, possibly EBUSY - do the full poll and let it handle any issues */
iouring_poll (EV_A_ EV_TS_CONST (0.));
/* iouring_poll should have done ECB_MEMORY_FENCE_ACQUIRE for us */
}
/*assert (("libev: io_uring queue full after flush", tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries)));*/
@ -630,7 +638,11 @@ static void
iouring_poll (EV_P_ ev_tstamp timeout)
{
/* if we have events, no need for extra syscalls, but we might have to queue events */
if (iouring_handle_cq (EV_A))
/* we also clar the timeout if there are outstanding fdchanges */
/* the latter should only happen if both the sq and cq are full, most likely */
/* because we have a lot of event sources that immediately complete */
/* TODO: fdchacngecnt is always 0 because fd_reify does not have two buffers yet */
if (iouring_handle_cq (EV_A) || fdchangecnt)
timeout = EV_TS_CONST (0.);
else
/* no events, so maybe wait for some */

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