| … | |
… | |
| 198 | linuxaio_iocbps [fd]->io.aio_buf = 0; |
198 | linuxaio_iocbps [fd]->io.aio_buf = 0; |
| 199 | anfds [fd].events = 0; |
199 | anfds [fd].events = 0; |
| 200 | fd_change (EV_A_ fd, 0); |
200 | fd_change (EV_A_ fd, 0); |
| 201 | |
201 | |
| 202 | /* feed events, we do not expect or handle POLLNVAL */ |
202 | /* feed events, we do not expect or handle POLLNVAL */ |
| 203 | if (ecb_expect_false (res & POLLNVAL)) |
203 | if (expect_false (res & POLLNVAL)) |
| 204 | fd_kill (EV_A_ fd); |
204 | fd_kill (EV_A_ fd); |
| 205 | else |
205 | else |
| 206 | fd_event ( |
206 | fd_event ( |
| 207 | EV_A_ |
207 | EV_A_ |
| 208 | fd, |
208 | fd, |
| … | |
… | |
| 229 | |
229 | |
| 230 | if (head == tail) |
230 | if (head == tail) |
| 231 | return 0; |
231 | return 0; |
| 232 | |
232 | |
| 233 | /* bail out if the ring buffer doesn't match the expected layout */ |
233 | /* bail out if the ring buffer doesn't match the expected layout */ |
| 234 | if (ecb_expect_false (ring->magic != AIO_RING_MAGIC) |
234 | if (expect_false (ring->magic != AIO_RING_MAGIC) |
| 235 | || ring->incompat_features != AIO_RING_INCOMPAT_FEATURES |
235 | || ring->incompat_features != AIO_RING_INCOMPAT_FEATURES |
| 236 | || ring->header_length != sizeof (struct aio_ring)) /* TODO: or use it to find io_event[0]? */ |
236 | || ring->header_length != sizeof (struct aio_ring)) /* TODO: or use it to find io_event[0]? */ |
| 237 | return 0; |
237 | return 0; |
| 238 | |
238 | |
| 239 | /* make sure the events up to tail are visible */ |
239 | /* make sure the events up to tail are visible */ |
| 240 | ECB_MEMORY_FENCE_ACQUIRE; |
240 | ECB_MEMORY_FENCE_ACQUIRE; |
| 241 | |
241 | |
| … | |
… | |
| 246 | { |
246 | { |
| 247 | linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head); |
247 | linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head); |
| 248 | linuxaio_parse_events (EV_A_ ring->io_events, tail); |
248 | linuxaio_parse_events (EV_A_ ring->io_events, tail); |
| 249 | } |
249 | } |
| 250 | |
250 | |
|
|
251 | /* TODO: we only need a compiler barrier here, not a read fence */ |
|
|
252 | ECB_MEMORY_FENCE_RELEASE; |
| 251 | /* as an extension to C, we hope that the volatile will makethis atomic and once-only */ |
253 | /* as an extension to C, we hope that the volatile will make this atomic and once-only */ |
| 252 | *(volatile unsigned *)&ring->head = tail; |
254 | *(volatile unsigned *)&ring->head = tail; |
| 253 | /* make sure kernel can see our new head value - probably not required */ |
255 | /* make sure kernel can see our new head value - probably not required */ |
| 254 | ECB_MEMORY_FENCE_RELEASE; |
256 | ECB_MEMORY_FENCE_RELEASE; |
| 255 | |
257 | |
| 256 | return 1; |
258 | return 1; |
| … | |
… | |
| 318 | /* which allows us to pinpoint the errornous iocb */ |
320 | /* which allows us to pinpoint the errornous iocb */ |
| 319 | for (submitted = 0; submitted < linuxaio_submitcnt; ) |
321 | for (submitted = 0; submitted < linuxaio_submitcnt; ) |
| 320 | { |
322 | { |
| 321 | int res = ev_io_submit (linuxaio_ctx, linuxaio_submitcnt - submitted, linuxaio_submits + submitted); |
323 | int res = ev_io_submit (linuxaio_ctx, linuxaio_submitcnt - submitted, linuxaio_submits + submitted); |
| 322 | |
324 | |
| 323 | if (ecb_expect_false (res < 0)) |
325 | if (expect_false (res < 0)) |
| 324 | if (errno == EAGAIN) |
326 | if (errno == EAGAIN) |
| 325 | { |
327 | { |
| 326 | /* This happens when the ring buffer is full, at least. I assume this means |
328 | /* This happens when the ring buffer is full, at least. I assume this means |
| 327 | * that the event was queued synchronously during io_submit, and thus |
329 | * that the event was queued synchronously during io_submit, and thus |
| 328 | * the buffer overflowed. |
330 | * the buffer overflowed. |
| … | |
… | |
| 374 | for (;;) |
376 | for (;;) |
| 375 | { |
377 | { |
| 376 | int idx; |
378 | int idx; |
| 377 | int res = epoll_wait (backend_fd, events, sizeof (events) / sizeof (events [0]), 0); |
379 | int res = epoll_wait (backend_fd, events, sizeof (events) / sizeof (events [0]), 0); |
| 378 | |
380 | |
| 379 | if (ecb_expect_false (res < 0)) |
381 | if (expect_false (res < 0)) |
| 380 | ev_syserr ("(libev) linuxaio epoll_wait"); |
382 | ev_syserr ("(libev) linuxaio epoll_wait"); |
| 381 | else if (!res) |
383 | else if (!res) |
| 382 | break; |
384 | break; |
| 383 | |
385 | |
| 384 | for (idx = res; idx--; ) |
386 | for (idx = res; idx--; ) |
