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| 228 | |
228 | |
| 229 | /* the submit/completion queue entries */ |
229 | /* the submit/completion queue entries */ |
| 230 | #define EV_SQES ((struct io_uring_sqe *) iouring_sqes) |
230 | #define EV_SQES ((struct io_uring_sqe *) iouring_sqes) |
| 231 | #define EV_CQES ((struct io_uring_cqe *)((char *)iouring_cq_ring + iouring_cq_cqes)) |
231 | #define EV_CQES ((struct io_uring_cqe *)((char *)iouring_cq_ring + iouring_cq_cqes)) |
| 232 | |
232 | |
| 233 | /* TODO: this is not enough, we might have to reap events */ |
233 | inline_speed |
| 234 | /* TODO: but we can't, as that will re-arm events, causing */ |
234 | int |
| 235 | /* TODO: an endless loop in fd_reify */ |
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| 236 | static int |
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| 237 | iouring_enter (EV_P_ ev_tstamp timeout) |
235 | iouring_enter (EV_P_ ev_tstamp timeout) |
| 238 | { |
236 | { |
| 239 | int res; |
237 | int res; |
| 240 | |
238 | |
| 241 | EV_RELEASE_CB; |
239 | EV_RELEASE_CB; |
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| 249 | |
247 | |
| 250 | EV_ACQUIRE_CB; |
248 | EV_ACQUIRE_CB; |
| 251 | |
249 | |
| 252 | return res; |
250 | return res; |
| 253 | } |
251 | } |
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252 | |
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253 | /* TODO: can we move things around so we don't need this forward-reference? */ |
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254 | static void |
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255 | iouring_poll (EV_P_ ev_tstamp timeout); |
| 254 | |
256 | |
| 255 | static |
257 | static |
| 256 | struct io_uring_sqe * |
258 | struct io_uring_sqe * |
| 257 | iouring_sqe_get (EV_P) |
259 | iouring_sqe_get (EV_P) |
| 258 | { |
260 | { |
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261 | unsigned tail; |
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262 | |
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263 | for (;;) |
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264 | { |
| 259 | unsigned tail = EV_SQ_VAR (tail); |
265 | tail = EV_SQ_VAR (tail); |
| 260 | |
266 | |
| 261 | while (ecb_expect_false (tail + 1 - EV_SQ_VAR (head) > EV_SQ_VAR (ring_entries))) |
267 | if (ecb_expect_true (tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries))) |
| 262 | { |
268 | break; /* whats the problem, we have free sqes */ |
| 263 | /* queue full, need to flush */ |
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| 264 | |
269 | |
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270 | /* queue full, need to flush and possibly handle some events */ |
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271 | |
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272 | #if EV_FEATURE_CODE |
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273 | /* first we ask the kernel nicely, most often this frees up some sqes */ |
| 265 | int res = iouring_enter (EV_A_ EV_TS_CONST (0.)); |
274 | int res = iouring_enter (EV_A_ EV_TS_CONST (0.)); |
| 266 | |
275 | |
| 267 | /* io_uring_enter might fail with EBUSY and won't submit anything */ |
276 | ECB_MEMORY_FENCE_ACQUIRE; /* better safe than sorry */ |
| 268 | /* unfortunately, we can't handle this at the moment */ |
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| 269 | |
277 | |
| 270 | if (res < 0 && errno == EBUSY) |
278 | if (res >= 0) |
| 271 | /* the sane thing might be to resize, but we can't */ |
279 | continue; /* yes, it worked, try again */ |
| 272 | //TODO |
280 | #endif |
| 273 | ev_syserr ("(libev) io_uring_enter could not clear sq"); |
281 | |
| 274 | else |
282 | /* some problem, possibly EBUSY - do the full poll and let it handle any issues */ |
| 275 | break; |
283 | |
| 276 | |
284 | iouring_poll (EV_A_ EV_TS_CONST (0.)); |
| 277 | /* iouring_poll should have done ECB_MEMORY_FENCE_ACQUIRE */ |
285 | /* iouring_poll should have done ECB_MEMORY_FENCE_ACQUIRE for us */ |
| 278 | } |
286 | } |
| 279 | |
287 | |
| 280 | /*assert (("libev: io_uring queue full after flush", tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries)));*/ |
288 | /*assert (("libev: io_uring queue full after flush", tail + 1 - EV_SQ_VAR (head) <= EV_SQ_VAR (ring_entries)));*/ |
| 281 | |
289 | |
| 282 | return EV_SQES + (tail & EV_SQ_VAR (ring_mask)); |
290 | return EV_SQES + (tail & EV_SQ_VAR (ring_mask)); |
| … | |
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| 628 | |
636 | |
| 629 | static void |
637 | static void |
| 630 | iouring_poll (EV_P_ ev_tstamp timeout) |
638 | iouring_poll (EV_P_ ev_tstamp timeout) |
| 631 | { |
639 | { |
| 632 | /* if we have events, no need for extra syscalls, but we might have to queue events */ |
640 | /* if we have events, no need for extra syscalls, but we might have to queue events */ |
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641 | /* we also clar the timeout if there are outstanding fdchanges */ |
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642 | /* the latter should only happen if both the sq and cq are full, most likely */ |
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643 | /* because we have a lot of event sources that immediately complete */ |
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644 | /* TODO: fdchacngecnt is always 0 because fd_reify does not have two buffers yet */ |
| 633 | if (iouring_handle_cq (EV_A)) |
645 | if (iouring_handle_cq (EV_A) || fdchangecnt) |
| 634 | timeout = EV_TS_CONST (0.); |
646 | timeout = EV_TS_CONST (0.); |
| 635 | else |
647 | else |
| 636 | /* no events, so maybe wait for some */ |
648 | /* no events, so maybe wait for some */ |
| 637 | iouring_tfd_update (EV_A_ timeout); |
649 | iouring_tfd_update (EV_A_ timeout); |
| 638 | |
650 | |
