… | |
… | |
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 | } |
… | |
… | |
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 | |
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|
249 | if (ecb_expect_false (iocb->io.aio_buf)) |
248 | else if (ecb_expect_false (iocb->io.aio_buf)) |
250 | { |
249 | { |
251 | /* 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 */ |
252 | for (;;) |
252 | for (;;) |
253 | { |
253 | { |
254 | /* on all relevant kernels, io_cancel fails with EINPROGRESS on "success" */ |
254 | /* on all relevant kernels, io_cancel fails with EINPROGRESS on "success" */ |
255 | 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)) |
256 | break; |
256 | break; |
257 | |
257 | |
258 | if (ecb_expect_true (errno == EINPROGRESS)) |
258 | if (ecb_expect_true (errno == EINPROGRESS)) |
259 | break; |
259 | break; |
260 | |
260 | |
261 | /* the EINPROGRESS test is for nicer error message. clumsy. */ |
261 | /* the EINPROGRESS test is for nicer error message. clumsy. */ |
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262 | if (errno != EINTR) |
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263 | { |
262 | assert (("libev: linuxaio unexpected io_cancel failed", errno != EINPROGRESS && errno != EINTR)); |
264 | assert (("libev: linuxaio unexpected io_cancel failed", errno != EINTR && errno != EINPROGRESS)); |
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265 | break; |
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266 | } |
263 | } |
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; |
264 | } |
271 | } |
265 | |
272 | |
266 | iocb->io.aio_buf = |
273 | iocb->io.aio_buf = |
267 | (nev & EV_READ ? POLLIN : 0) |
274 | (nev & EV_READ ? POLLIN : 0) |
268 | | (nev & EV_WRITE ? POLLOUT : 0); |
275 | | (nev & EV_WRITE ? POLLOUT : 0); |
269 | |
276 | |
270 | if (nev) |
277 | if (nev) |
271 | { |
278 | { |
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|
279 | iocb->io.aio_data = (uint32_t)fd | ((__u64)(uint32_t)anfd->egen << 32); |
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280 | |
272 | /* queue iocb up for io_submit */ |
281 | /* queue iocb up for io_submit */ |
273 | /* 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 */ |
274 | ++linuxaio_submitcnt; |
283 | ++linuxaio_submitcnt; |
275 | 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); |
276 | linuxaio_submits [linuxaio_submitcnt - 1] = &iocb->io; |
285 | linuxaio_submits [linuxaio_submitcnt - 1] = &iocb->io; |
… | |
… | |
295 | static void |
304 | static void |
296 | linuxaio_parse_events (EV_P_ struct io_event *ev, int nr) |
305 | linuxaio_parse_events (EV_P_ struct io_event *ev, int nr) |
297 | { |
306 | { |
298 | while (nr) |
307 | while (nr) |
299 | { |
308 | { |
300 | int fd = ev->data; |
309 | int fd = ev->data & 0xffffffff; |
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|
310 | uint32_t gen = ev->data >> 32; |
301 | int res = ev->res; |
311 | int res = ev->res; |
302 | |
312 | |
303 | 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)); |
304 | |
314 | |
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315 | /* only accept events if generation counter matches */ |
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316 | if (ecb_expect_true (gen == (uint32_t)anfds [fd].egen)) |
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317 | { |
305 | /* feed events, we do not expect or handle POLLNVAL */ |
318 | /* feed events, we do not expect or handle POLLNVAL */ |
306 | fd_event ( |
319 | fd_event ( |
307 | EV_A_ |
320 | EV_A_ |
308 | fd, |
321 | fd, |
309 | (res & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
322 | (res & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) |
310 | | (res & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
323 | | (res & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) |
311 | ); |
324 | ); |
312 | |
325 | |
313 | /* linux aio is oneshot: rearm fd. TODO: this does more work than strictly needed */ |
326 | /* linux aio is oneshot: rearm fd. TODO: this does more work than strictly needed */ |
314 | linuxaio_fd_rearm (EV_A_ fd); |
327 | linuxaio_fd_rearm (EV_A_ fd); |
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|
328 | } |
315 | |
329 | |
316 | --nr; |
330 | --nr; |
317 | ++ev; |
331 | ++ev; |
318 | } |
332 | } |
319 | } |
333 | } |
… | |
… | |
334 | |
348 | |
335 | if (head == tail) |
349 | if (head == tail) |
336 | return 0; |
350 | return 0; |
337 | |
351 | |
338 | /* parse all available events, but only once, to avoid starvation */ |
352 | /* parse all available events, but only once, to avoid starvation */ |
339 | if (tail > head) /* normal case around */ |
353 | if (ecb_expect_true (tail > head)) /* normal case around */ |
340 | linuxaio_parse_events (EV_A_ ring->io_events + head, tail - head); |
354 | linuxaio_parse_events (EV_A_ ring->io_events + head, tail - head); |
341 | else /* wrapped around */ |
355 | else /* wrapped around */ |
342 | { |
356 | { |
343 | linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head); |
357 | linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head); |
344 | linuxaio_parse_events (EV_A_ ring->io_events, tail); |
358 | linuxaio_parse_events (EV_A_ ring->io_events, tail); |
… | |
… | |
584 | |
598 | |
585 | ecb_cold |
599 | ecb_cold |
586 | static void |
600 | static void |
587 | linuxaio_fork (EV_P) |
601 | linuxaio_fork (EV_P) |
588 | { |
602 | { |
589 | /* this frees all iocbs, which is very heavy-handed */ |
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|
590 | linuxaio_destroy (EV_A); |
|
|
591 | linuxaio_submitcnt = 0; /* all pointers were invalidated */ |
603 | linuxaio_submitcnt = 0; /* all pointers were invalidated */ |
|
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604 | linuxaio_free_iocbp (EV_A); /* this frees all iocbs, which is very heavy-handed */ |
|
|
605 | evsys_io_destroy (linuxaio_ctx); /* fails in child, aio context is destroyed */ |
592 | |
606 | |
593 | linuxaio_iteration = 0; /* we start over in the child */ |
607 | linuxaio_iteration = 0; /* we start over in the child */ |
594 | |
608 | |
595 | while (linuxaio_io_setup (EV_A) < 0) |
609 | while (linuxaio_io_setup (EV_A) < 0) |
596 | ev_syserr ("(libev) linuxaio io_setup"); |
610 | ev_syserr ("(libev) linuxaio io_setup"); |