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This commit is contained in:
Marc Alexander Lehmann 2019-12-28 05:20:17 +00:00
parent 9f4ecfba9e
commit f0e57612db
1 changed files with 41 additions and 14 deletions
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55
ev_iouring.c
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@ -230,20 +230,53 @@ 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
iouring_enter (EV_P_ ev_tstamp timeout)
{
int res;
EV_RELEASE_CB;
res = evsys_io_uring_enter (iouring_fd, iouring_to_submit, 1,
timeout > EV_TS_CONST (0.) ? IORING_ENTER_GETEVENTS : 0, 0, 0);
assert (("libev: io_uring_enter did not consume all sqes", (res < 0 || res == iouring_to_submit)));
iouring_to_submit = 0;
EV_ACQUIRE_CB;
return res;
}
static
struct io_uring_sqe *
iouring_sqe_get (EV_P)
{
unsigned tail = EV_SQ_VAR (tail);
if (tail + 1 - EV_SQ_VAR (head) > EV_SQ_VAR (ring_entries))
while (ecb_expect_false (tail + 1 - EV_SQ_VAR (head) > EV_SQ_VAR (ring_entries)))
{
/* queue full, flush */
evsys_io_uring_enter (iouring_fd, iouring_to_submit, 0, 0, 0, 0);
iouring_to_submit = 0;
/* queue full, need to flush */
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 */
if (res < 0 && errno == EBUSY)
//TODO
ev_syserr ("(libev) io_uring_enter could not clear sq");
else
break;
/* iouring_poll should have done ECB_MEMORY_FENCE_ACQUIRE */
}
assert (("libev: io_uring queue full after flush", tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries)));
/*assert (("libev: io_uring queue full after flush", tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries)));*/
return EV_SQES + (tail & EV_SQ_VAR (ring_mask));
}
@ -600,19 +633,13 @@ iouring_poll (EV_P_ ev_tstamp timeout)
/* only enter the kernel if we have something to submit, or we need to wait */
if (timeout || iouring_to_submit)
{
int res;
EV_RELEASE_CB;
res = evsys_io_uring_enter (iouring_fd, iouring_to_submit, 1,
timeout > EV_TS_CONST (0.) ? IORING_ENTER_GETEVENTS : 0, 0, 0);
iouring_to_submit = 0;
EV_ACQUIRE_CB;
int res = iouring_enter (EV_A_ timeout);
if (ecb_expect_false (res < 0))
if (errno == EINTR)
/* ignore */;
else if (errno == EBUSY)
/* cq full, cannot submit - should be rare because we flush the cq first, so simply ignore */;
else
ev_syserr ("(libev) iouring setup");
else