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212 | * this is not well documented, so we better do it. |
212 | * this is not well documented, so we better do it. |
213 | */ |
213 | */ |
214 | memset (iocb, 0, sizeof (*iocb)); |
214 | memset (iocb, 0, sizeof (*iocb)); |
215 | |
215 | |
216 | iocb->io.aio_lio_opcode = IOCB_CMD_POLL; |
216 | iocb->io.aio_lio_opcode = IOCB_CMD_POLL; |
217 | iocb->io.aio_data = offset; |
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218 | iocb->io.aio_fildes = offset; |
217 | iocb->io.aio_fildes = offset; |
219 | |
218 | |
220 | base [offset++] = iocb; |
219 | base [offset++] = iocb; |
221 | } |
220 | } |
222 | } |
221 | } |
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234 | static void |
233 | static void |
235 | linuxaio_modify (EV_P_ int fd, int oev, int nev) |
234 | linuxaio_modify (EV_P_ int fd, int oev, int nev) |
236 | { |
235 | { |
237 | array_needsize (ANIOCBP, linuxaio_iocbps, linuxaio_iocbpmax, fd + 1, linuxaio_array_needsize_iocbp); |
236 | array_needsize (ANIOCBP, linuxaio_iocbps, linuxaio_iocbpmax, fd + 1, linuxaio_array_needsize_iocbp); |
238 | ANIOCBP iocb = linuxaio_iocbps [fd]; |
237 | ANIOCBP iocb = linuxaio_iocbps [fd]; |
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238 | ANFD *anfd = &anfds [fd]; |
239 | |
239 | |
240 | if (ecb_expect_false (iocb->io.aio_reqprio < 0)) |
240 | if (ecb_expect_false (iocb->io.aio_reqprio < 0)) |
241 | { |
241 | { |
242 | /* we handed this fd over to epoll, so undo this first */ |
242 | /* we handed this fd over to epoll, so undo this first */ |
243 | /* we do it manually because the optimisations on epoll_modify won't do us any good */ |
243 | /* we do it manually because the optimisations on epoll_modify won't do us any good */ |
244 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
244 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
245 | anfds [fd].emask = 0; |
245 | anfd->emask = 0; |
246 | iocb->io.aio_reqprio = 0; |
246 | iocb->io.aio_reqprio = 0; |
247 | } |
247 | } |
248 | else if (ecb_expect_false (iocb->io.aio_buf)) |
248 | else if (ecb_expect_false (iocb->io.aio_buf)) |
249 | { |
249 | { |
250 | /* iocb active, so cancel it first before resubmit */ |
250 | /* iocb active, so cancel it first before resubmit */ |
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251 | /* this assumes we only ever get one call per fd per loop iteration */ |
251 | for (;;) |
252 | for (;;) |
252 | { |
253 | { |
253 | /* on all relevant kernels, io_cancel fails with EINPROGRESS on "success" */ |
254 | /* on all relevant kernels, io_cancel fails with EINPROGRESS on "success" */ |
254 | if (ecb_expect_false (evsys_io_cancel (linuxaio_ctx, &iocb->io, (struct io_event *)0) == 0)) |
255 | if (ecb_expect_false (evsys_io_cancel (linuxaio_ctx, &iocb->io, (struct io_event *)0) == 0)) |
255 | break; |
256 | break; |
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262 | { |
263 | { |
263 | assert (("libev: linuxaio unexpected io_cancel failed", errno != EINTR && errno != EINPROGRESS)); |
264 | assert (("libev: linuxaio unexpected io_cancel failed", errno != EINTR && errno != EINPROGRESS)); |
264 | break; |
265 | break; |
265 | } |
266 | } |
266 | } |
267 | } |
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268 | |
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269 | /* increment generation counter to avoid handling old events */ |
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270 | ++anfd->egen; |
267 | } |
271 | } |
268 | |
272 | |
269 | iocb->io.aio_buf = |
273 | iocb->io.aio_buf = |
270 | (nev & EV_READ ? POLLIN : 0) |
274 | (nev & EV_READ ? POLLIN : 0) |
271 | | (nev & EV_WRITE ? POLLOUT : 0); |
275 | | (nev & EV_WRITE ? POLLOUT : 0); |
272 | |
276 | |
273 | if (nev) |
277 | if (nev) |
274 | { |
278 | { |
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279 | iocb->io.aio_data = (uint32_t)fd | ((__u64)(uint32_t)anfd->egen << 32); |
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280 | |
275 | /* queue iocb up for io_submit */ |
281 | /* queue iocb up for io_submit */ |
276 | /* this assumes we only ever get one call per fd per loop iteration */ |
282 | /* this assumes we only ever get one call per fd per loop iteration */ |
277 | ++linuxaio_submitcnt; |
283 | ++linuxaio_submitcnt; |
278 | array_needsize (struct iocb *, linuxaio_submits, linuxaio_submitmax, linuxaio_submitcnt, array_needsize_noinit); |
284 | array_needsize (struct iocb *, linuxaio_submits, linuxaio_submitmax, linuxaio_submitcnt, array_needsize_noinit); |
279 | linuxaio_submits [linuxaio_submitcnt - 1] = &iocb->io; |
285 | linuxaio_submits [linuxaio_submitcnt - 1] = &iocb->io; |
… | |
… | |
298 | static void |
304 | static void |
299 | linuxaio_parse_events (EV_P_ struct io_event *ev, int nr) |
305 | linuxaio_parse_events (EV_P_ struct io_event *ev, int nr) |
300 | { |
306 | { |
301 | while (nr) |
307 | while (nr) |
302 | { |
308 | { |
303 | int fd = ev->data; |
309 | int fd = ev->data & 0xffffffff; |
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310 | uint32_t gen = ev->data >> 32; |
304 | int res = ev->res; |
311 | int res = ev->res; |
305 | |
312 | |
306 | assert (("libev: iocb fd must be in-bounds", fd >= 0 && fd < anfdmax)); |
313 | assert (("libev: iocb fd must be in-bounds", fd >= 0 && fd < anfdmax)); |
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314 | |
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315 | /* ignore event if generation doesn't match */ |
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316 | if (ecb_expect_false (gen != (uint32_t)anfds [fd].egen)) |
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317 | continue; |
307 | |
318 | |
308 | /* feed events, we do not expect or handle POLLNVAL */ |
319 | /* feed events, we do not expect or handle POLLNVAL */ |
309 | fd_event ( |
320 | fd_event ( |
310 | EV_A_ |
321 | EV_A_ |
311 | fd, |
322 | fd, |