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Comparing libev/ev_linuxaio.c (file contents):
Revision 1.1 by root, Thu Jun 20 22:44:59 2019 UTC vs.
Revision 1.23 by root, Mon Jun 24 21:34:47 2019 UTC

… …
35 * and other provisions required by the GPL. If you do not delete the 35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under 36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL. 37 * either the BSD or the GPL.
38 */ 38 */
39 39
40#define EPOLL_FALLBACK 1
41
40#include <sys/time.h> /* actually linux/time.h, but we must assume they are compatible */ 42#include <sys/time.h> /* actually linux/time.h, but we must assume they are compatible */
43#include <poll.h>
41#include <linux/aio_abi.h> 44#include <linux/aio_abi.h>
42 45
46#if EPOLL_FALLBACK
47# include <sys/epoll.h>
48#endif
49
43/* we try to fill 4kn pages exactly. 50/* we try to fill 4kB pages exactly.
44 * the ring buffer header is 32 bytes, every io event is 32 bytes. 51 * the ring buffer header is 32 bytes, every io event is 32 bytes.
45 * the kernel takes the io event number, doubles it, adds 2, adds the ring buffer 52 * the kernel takes the io event number, doubles it, adds 2, adds the ring buffer.
46 * so the calculation below will use "exactly" 8kB for the ring buffer 53 * therefore the calculation below will use "exactly" 4kB for the ring buffer
47 */ 54 */
48#define EV_LINUXAIO_DEPTH (256 / 2 - 2 - 1) /* max. number of io events per batch */ 55#define EV_LINUXAIO_DEPTH (128 / 2 - 2 - 1) /* max. number of io events per batch */
49 56
50/*****************************************************************************/ 57/*****************************************************************************/
51/* syscall wrapdadoop */ 58/* syscall wrapdadoop - this section has the raw syscall definitions */
52 59
53#include <sys/syscall.h> /* no glibc wrappers */ 60#include <sys/syscall.h> /* no glibc wrappers */
54 61
55/* aio_abi.h is not verioned in any way, so we cannot test for its existance */ 62/* aio_abi.h is not versioned in any way, so we cannot test for its existance */
56#define IOCB_CMD_POLL 5 63#define IOCB_CMD_POLL 5
57 64
58/* taken from linux/fs/aio.c */ 65/* taken from linux/fs/aio.c */
59#define AIO_RING_MAGIC 0xa10a10a1 66#define AIO_RING_MAGIC 0xa10a10a1
60#define AIO_RING_INCOMPAT_FEATURES 0 67#define AIO_RING_INCOMPAT_FEATURES 0
… …
71 unsigned header_length; /* size of aio_ring */ 78 unsigned header_length; /* size of aio_ring */
72 79
73 struct io_event io_events[0]; 80 struct io_event io_events[0];
74}; 81};
75 82
76static int 83inline_size
84int
77ev_io_setup (unsigned nr_events, aio_context_t *ctx_idp) 85evsys_io_setup (unsigned nr_events, aio_context_t *ctx_idp)
78{ 86{
79 return syscall (SYS_io_setup, nr_events, ctx_idp); 87 return syscall (SYS_io_setup, nr_events, ctx_idp);
80} 88}
81 89
82static int 90inline_size
91int
83ev_io_destroy (aio_context_t ctx_id) 92evsys_io_destroy (aio_context_t ctx_id)
84{ 93{
85 return syscall (SYS_io_destroy, ctx_id); 94 return syscall (SYS_io_destroy, ctx_id);
86} 95}
87 96
88static int 97inline_size
98int
89ev_io_submit (aio_context_t ctx_id, long nr, struct iocb *cbp[]) 99evsys_io_submit (aio_context_t ctx_id, long nr, struct iocb *cbp[])
90{ 100{
91 return syscall (SYS_io_submit, ctx_id, nr, cbp); 101 return syscall (SYS_io_submit, ctx_id, nr, cbp);
92} 102}
93 103
94static int 104inline_size
105int
95ev_io_cancel (aio_context_t ctx_id, struct iocb *cbp, struct io_event *result) 106evsys_io_cancel (aio_context_t ctx_id, struct iocb *cbp, struct io_event *result)
96{ 107{
97 return syscall (SYS_io_cancel, ctx_id, cbp, result); 108 return syscall (SYS_io_cancel, ctx_id, cbp, result);
98} 109}
99 110
100static int 111inline_size
112int
101ev_io_getevents (aio_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct timespec *timeout) 113evsys_io_getevents (aio_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct timespec *timeout)
102{ 114{
103 return syscall (SYS_io_getevents, ctx_id, min_nr, nr, events, timeout); 115 return syscall (SYS_io_getevents, ctx_id, min_nr, nr, events, timeout);
104} 116}
105
106typedef void (*ev_io_cb) (long nr, struct io_event *events);
107 117
108/*****************************************************************************/ 118/*****************************************************************************/
109/* actual backed implementation */ 119/* actual backed implementation */
110 120
111/* two iocbs for every fd, one for read, one for write */ 121/* we use out own wrapper structure in acse we ever want to do something "clever" */
112typedef struct aniocb 122typedef struct aniocb
113{ 123{
114 struct iocb io; 124 struct iocb io;
115 /*int inuse;*/ 125 /*int inuse;*/
116} *ANIOCBP; 126} *ANIOCBP;
117 127
118inline_size 128inline_size
119void 129void
120linuxaio_array_needsize_iocbp (ANIOCBP *base, int count) 130linuxaio_array_needsize_iocbp (ANIOCBP *base, int offset, int count)
121{ 131{
122 /* TODO: quite the overhead to allocate every iocb separately */
123 while (count--) 132 while (count--)
124 { 133 {
134 /* TODO: quite the overhead to allocate every iocb separately, maybe use our own alocator? */
125 *base = (ANIOCBP)ev_malloc (sizeof (**base)); 135 ANIOCBP iocb = (ANIOCBP)ev_malloc (sizeof (*iocb));
136
137 /* full zero initialise is probably not required at the moment, but
138 * this is not well documented, so we better do it.
139 */
126 memset (*base, 0, sizeof (**base)); 140 memset (iocb, 0, sizeof (*iocb));
127 /* would be nice to initialize fd/data as well */ 141
128 (*base)->io.aio_lio_opcode = IOCB_CMD_POLL; 142 iocb->io.aio_lio_opcode = IOCB_CMD_POLL;
129 ++base; 143 iocb->io.aio_data = offset;
130 } 144 iocb->io.aio_fildes = offset;
131}
132 145
146 base [offset++] = iocb;
147 }
148}
149
150ecb_cold
133static void 151static void
134linuxaio_free_iocbp (EV_P) 152linuxaio_free_iocbp (EV_P)
135{ 153{
136 while (linuxaio_iocbpmax--) 154 while (linuxaio_iocbpmax--)
137 ev_free (linuxaio_iocbps [linuxaio_iocbpmax]); 155 ev_free (linuxaio_iocbps [linuxaio_iocbpmax]);
138 156
139 linuxaio_iocbpmax = 0; 157 linuxaio_iocbpmax = 0; /* next resize will completely reallocate the array, at some overhead */
140} 158}
141 159
142static void 160static void
143linuxaio_modify (EV_P_ int fd, int oev, int nev) 161linuxaio_modify (EV_P_ int fd, int oev, int nev)
144{ 162{
145 /* TODO: full zero initialize required? */
146 array_needsize (ANIOCBP, linuxaio_iocbps, linuxaio_iocbpmax, fd + 1, linuxaio_array_needsize_iocbp); 163 array_needsize (ANIOCBP, linuxaio_iocbps, linuxaio_iocbpmax, fd + 1, linuxaio_array_needsize_iocbp);
147 struct aniocb *iocb = linuxaio_iocbps [fd]; 164 ANIOCBP iocb = linuxaio_iocbps [fd];
165
166#if EPOLL_FALLBACK
167 if (iocb->io.aio_reqprio < 0)
168 {
169 epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0);
170 iocb->io.aio_reqprio = 0;
171 }
172#endif
148 173
149 if (iocb->io.aio_buf) 174 if (iocb->io.aio_buf)
150 ev_io_cancel (linuxaio_ctx, &iocb->io, (void *)0); 175 evsys_io_cancel (linuxaio_ctx, &iocb->io, (struct io_event *)0); /* always returns an error relevant kernels */
151 176
152 if (nev) 177 if (nev)
153 { 178 {
154 iocb->io.aio_data = fd;
155 iocb->io.aio_fildes = fd;
156 iocb->io.aio_buf = 179 iocb->io.aio_buf =
157 (nev & EV_READ ? POLLIN : 0) 180 (nev & EV_READ ? POLLIN : 0)
158 | (nev & EV_WRITE ? POLLOUT : 0); 181 | (nev & EV_WRITE ? POLLOUT : 0);
159 182
160 /* queue iocb up for io_submit */ 183 /* queue iocb up for io_submit */
161 /* this assumes we only ever get one call per fd per loop iteration */ 184 /* this assumes we only ever get one call per fd per loop iteration */
… …
163 array_needsize (struct iocb *, linuxaio_submits, linuxaio_submitmax, linuxaio_submitcnt, array_needsize_noinit); 186 array_needsize (struct iocb *, linuxaio_submits, linuxaio_submitmax, linuxaio_submitcnt, array_needsize_noinit);
164 linuxaio_submits [linuxaio_submitcnt - 1] = &iocb->io; 187 linuxaio_submits [linuxaio_submitcnt - 1] = &iocb->io;
165 } 188 }
166} 189}
167 190
191#if EPOLL_FALLBACK
192
193static void
194linuxaio_rearm_epoll (EV_P_ struct iocb *iocb, int op)
195{
196 struct epoll_event eev;
197
198 eev.events = EPOLLONESHOT;
199 if (iocb->aio_buf & POLLIN ) eev.events |= EPOLLIN ;
200 if (iocb->aio_buf & POLLOUT) eev.events |= EPOLLOUT;
201 eev.data.fd = iocb->aio_fildes;
202
203 if (epoll_ctl (backend_fd, op, iocb->aio_fildes, &eev) < 0)
204 ev_syserr ("(libeio) linuxaio epoll_ctl");
205}
206
207static void
208linuxaio_epoll_cb (EV_P_ struct ev_io *w, int revents)
209{
210 struct epoll_event events[16];
211
212 for (;;)
213 {
214 int idx;
215 int res = epoll_wait (backend_fd, events, sizeof (events) / sizeof (events [0]), 0);
216
217 if (expect_false (res < 0))
218 ev_syserr ("(libev) linuxaio epoll_wait");
219 else if (!res)
220 break;
221
222 for (idx = res; idx--; )
223 {
224 int fd = events [idx].data.fd;
225 uint32_t ev = events [idx].events;
226
227 assert (("libev: iocb fd must be in-bounds", fd >= 0 && fd < anfdmax));
228
229 linuxaio_rearm_epoll (EV_A_ &linuxaio_iocbps [fd]->io, EPOLL_CTL_MOD);
230
231 fd_event (EV_A_ fd,
232 (ev & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
233 | (ev & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0));
234 }
235
236 if (res < sizeof (events) / sizeof (events [0]))
237 break;
238 }
239}
240
241#endif
242
168static void 243static void
169linuxaio_parse_events (EV_P_ struct io_event *ev, int nr) 244linuxaio_parse_events (EV_P_ struct io_event *ev, int nr)
170{ 245{
171 while (nr) 246 while (nr)
172 { 247 {
173 int fd = ev->data; 248 int fd = ev->data;
174 int res = ev->res; 249 int res = ev->res;
175 250
176 assert (("libev: iocb fd must be in-bounds", fd >= 0 && fd < anfdxmax)); 251 assert (("libev: iocb fd must be in-bounds", fd >= 0 && fd < anfdmax));
177 252
178 /* linux aio is oneshot: rearm fd */ 253 /* linux aio is oneshot: rearm fd. TODO: this does more work than needed */
179 linuxaio_iocbps [fd]->io.aio_buf = 0; 254 linuxaio_iocbps [fd]->io.aio_buf = 0;
180 anfds [fd].events = 0; 255 anfds [fd].events = 0;
181 fd_change (EV_A_ fd, 0); 256 fd_change (EV_A_ fd, 0);
182 257
183 /* feed events, we do not expect or handle POLLNVAL */ 258 /* feed events, we do not expect or handle POLLNVAL */
184 if (ecb_expect_false (res & POLLNVAL))
185 fd_kill (EV_A_ fd);
186 else
187 fd_event ( 259 fd_event (
188 EV_A_ 260 EV_A_
189 fd, 261 fd,
190 (res & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0) 262 (res & (POLLOUT | POLLERR | POLLHUP) ? EV_WRITE : 0)
191 | (res & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0) 263 | (res & (POLLIN | POLLERR | POLLHUP) ? EV_READ : 0)
192 ); 264 );
193 265
194 --nr; 266 --nr;
195 ++ev; 267 ++ev;
196 } 268 }
197} 269}
… …
200static int 272static int
201linuxaio_get_events_from_ring (EV_P) 273linuxaio_get_events_from_ring (EV_P)
202{ 274{
203 struct aio_ring *ring = (struct aio_ring *)linuxaio_ctx; 275 struct aio_ring *ring = (struct aio_ring *)linuxaio_ctx;
204 276
277 /* the kernel reads and writes both of these variables, */
278 /* as a C extension, we assume that volatile use here */
279 /* both makes reads atomic and once-only */
280 unsigned head = *(volatile unsigned *)&ring->head;
281 unsigned tail = *(volatile unsigned *)&ring->tail;
282
283 if (head == tail)
284 return 0;
285
286 /* bail out if the ring buffer doesn't match the expected layout */
287 if (expect_false (ring->magic != AIO_RING_MAGIC)
288 || ring->incompat_features != AIO_RING_INCOMPAT_FEATURES
289 || ring->header_length != sizeof (struct aio_ring)) /* TODO: or use it to find io_event[0]? */
290 return 0;
291
292 /* make sure the events up to tail are visible */
205 ECB_MEMORY_FENCE_ACQUIRE; 293 ECB_MEMORY_FENCE_ACQUIRE;
206
207 unsigned head = ring->head;
208 unsigned tail = *(volatile unsigned *)&ring->tail;
209
210 if (ring->magic != AIO_RING_MAGIC
211 || ring->incompat_features != AIO_RING_INCOMPAT_FEATURES
212 || ring->header_length != sizeof (struct aio_ring) /* TODO: or use it to find io_event[0]? */
213 || head == tail)
214 return 0;
215 294
216 /* parse all available events, but only once, to avoid starvation */ 295 /* parse all available events, but only once, to avoid starvation */
217 if (tail > head) /* normal case around */ 296 if (tail > head) /* normal case around */
218 linuxaio_parse_events (EV_A_ ring->io_events + head, tail - head); 297 linuxaio_parse_events (EV_A_ ring->io_events + head, tail - head);
219 else
220 {
221 /* wrapped around */ 298 else /* wrapped around */
299 {
222 linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head); 300 linuxaio_parse_events (EV_A_ ring->io_events + head, ring->nr - head);
223 linuxaio_parse_events (EV_A_ ring->io_events, tail); 301 linuxaio_parse_events (EV_A_ ring->io_events, tail);
224 } 302 }
225 303
226 ring->head = tail; 304 /* TODO: we only need a compiler barrier here, not a read fence */
305 ECB_MEMORY_FENCE_RELEASE;
306 /* as an extension to C, we hope that the volatile will make this atomic and once-only */
307 *(volatile unsigned *)&ring->head = tail;
308 /* make sure kernel can see our new head value - probably not required */
309 ECB_MEMORY_FENCE_RELEASE;
227 310
228 return 1; 311 return 1;
229} 312}
230 313
231/* read at least one event from kernel, or timeout */ 314/* read at least one event from kernel, or timeout */
232inline_size 315inline_size
233void 316void
234linuxaio_get_events (EV_P_ ev_tstamp timeout) 317linuxaio_get_events (EV_P_ ev_tstamp timeout)
235{ 318{
236 struct timespec ts; 319 struct timespec ts;
237 struct io_event ioev; 320 struct io_event ioev[1];
238 int res; 321 int res;
239 322
240 if (linuxaio_get_events_from_ring (EV_A)) 323 if (linuxaio_get_events_from_ring (EV_A))
241 return; 324 return;
242 325
243 /* no events, so wait for at least one, then poll ring buffer again */ 326 /* no events, so wait for at least one, then poll ring buffer again */
244 /* this degraded to one event per loop iteration */ 327 /* this degrades to one event per loop iteration */
245 /* if the ring buffer changes layout, but so be it */ 328 /* if the ring buffer changes layout, but so be it */
329
330 EV_RELEASE_CB;
246 331
247 ts.tv_sec = (long)timeout; 332 ts.tv_sec = (long)timeout;
248 ts.tv_nsec = (long)((timeout - ts.tv_sec) * 1e9); 333 ts.tv_nsec = (long)((timeout - ts.tv_sec) * 1e9);
249 334
250 res = ev_io_getevents (linuxaio_ctx, 1, 1, &ioev, &ts); 335 res = evsys_io_getevents (linuxaio_ctx, 1, sizeof (ioev) / sizeof (ioev [0]), ioev, &ts);
336
337 EV_ACQUIRE_CB;
251 338
252 if (res < 0) 339 if (res < 0)
340 if (errno == EINTR)
341 /* ignored */;
342 else
253 ev_syserr ("(libev) io_getevents"); 343 ev_syserr ("(libev) linuxaio io_getevents");
254 else if (res) 344 else if (res)
255 { 345 {
256 /* at least one event received, handle it and any remaining ones in the ring buffer */ 346 /* at least one event received, handle it and any remaining ones in the ring buffer */
257 linuxaio_parse_events (EV_A_ &ioev, 1); 347 linuxaio_parse_events (EV_A_ ioev, res);
258 linuxaio_get_events_from_ring (EV_A); 348 linuxaio_get_events_from_ring (EV_A);
259 } 349 }
260} 350}
261 351
262static void 352static void
… …
269 /* io_submit might return less than the requested number of iocbs */ 359 /* io_submit might return less than the requested number of iocbs */
270 /* this is, afaics, only because of errors, but we go by the book and use a loop, */ 360 /* this is, afaics, only because of errors, but we go by the book and use a loop, */
271 /* which allows us to pinpoint the errornous iocb */ 361 /* which allows us to pinpoint the errornous iocb */
272 for (submitted = 0; submitted < linuxaio_submitcnt; ) 362 for (submitted = 0; submitted < linuxaio_submitcnt; )
273 { 363 {
364#if 0
365 int res;
366 if (linuxaio_submits[submitted]->aio_fildes == backend_fd)
367 res = evsys_io_submit (linuxaio_ctx, 1, linuxaio_submits + submitted);
368 else
369 { res = -1; errno = EINVAL; };
370#else
274 int res = ev_io_submit (linuxaio_ctx, linuxaio_submitcnt - submitted, linuxaio_submits + submitted); 371 int res = evsys_io_submit (linuxaio_ctx, linuxaio_submitcnt - submitted, linuxaio_submits + submitted);
372#endif
275 373
276 if (res < 0) 374 if (expect_false (res < 0))
277 if (errno == EAGAIN) 375 if (errno == EAGAIN)
278 { 376 {
279 /* This happens when the ring buffer is full, at least. I assume this means 377 /* This happens when the ring buffer is full, at least. I assume this means
280 * that the event was queued synchronously during io_submit, and thus 378 * that the event was queued synchronously during io_submit, and thus
281 * the buffer overflowd. 379 * the buffer overflowed.
282 * In this case, we just try next loop iteration. 380 * In this case, we just try in next loop iteration.
381 * This should not result in a few fds taking priority, as the interface
382 * is one-shot, and we submit iocb's in a round-robin fashion.
383 * TODO: maybe make "submitted" persistent, so we don't have to memmove?
283 */ 384 */
385 if (ecb_expect_false (submitted))
386 {
284 memcpy (linuxaio_submits, linuxaio_submits + submitted, (linuxaio_submitcnt - submitted) * sizeof (*linuxaio_submits)); 387 memmove (linuxaio_submits, linuxaio_submits + submitted, (linuxaio_submitcnt - submitted) * sizeof (*linuxaio_submits));
285 linuxaio_submitcnt -= submitted; 388 linuxaio_submitcnt -= submitted;
389 }
390
286 timeout = 0; 391 timeout = 0;
287 break; 392 break;
288 } 393 }
394#if EPOLL_FALLBACK
395 else if (errno == EINVAL)
396 {
397 /* This happens for unsupported fds, officially, but in my testing,
398 * also randomly happens for supported fds. We fall back to good old
399 * poll() here, under the assumption that this is a very rare case.
400 * See https://lore.kernel.org/patchwork/patch/1047453/ to see
401 * discussion about such a case (ttys) where polling for POLLIN
402 * fails but POLLIN|POLLOUT works.
403 */
404 struct iocb *iocb = linuxaio_submits [submitted];
405
406 linuxaio_rearm_epoll (EV_A_ linuxaio_submits [submitted], EPOLL_CTL_ADD);
407 iocb->aio_reqprio = -1; /* mark iocb as epoll */
408
409 res = 1; /* skip this iocb */
410 }
411#endif
412 else if (errno == EBADF)
413 {
414 fd_kill (EV_A_ linuxaio_submits [submitted]->aio_fildes);
415
416 res = 1; /* skip this iocb */
417 }
289 else 418 else
290 /* TODO: we get EAGAIN when the ring buffer is full for some reason */
291 /* TODO: should we always just try next time? */
292 ev_syserr ("(libev) io_submit"); 419 ev_syserr ("(libev) linuxaio io_submit");
293 420
294 submitted += res; 421 submitted += res;
295 } 422 }
296 423
297 linuxaio_submitcnt = 0; 424 linuxaio_submitcnt = 0;
… …
304inline_size 431inline_size
305int 432int
306linuxaio_init (EV_P_ int flags) 433linuxaio_init (EV_P_ int flags)
307{ 434{
308 /* would be great to have a nice test for IOCB_CMD_POLL instead */ 435 /* would be great to have a nice test for IOCB_CMD_POLL instead */
309 if (ev_linux_version () < 0x041200) /* 4.18 introduced IOCB_CMD_POLL */ 436 /* also: test some semi-common fd types, such as files and ttys in recommended_backends */
437#if EPOLL_FALLBACK
438 /* 4.19 made epoll work */
439 if (ev_linux_version () < 0x041300)
310 return 0; 440 return 0;
311 441#else
312 if (ev_io_setup (EV_LINUXAIO_DEPTH, &linuxaio_ctx) < 0) 442 /* 4.18 introduced IOCB_CMD_POLL */
443 if (ev_linux_version () < 0x041200)
313 return 0; 444 return 0;
445#endif
446
447 linuxaio_ctx = 0;
448 if (evsys_io_setup (EV_LINUXAIO_DEPTH, &linuxaio_ctx) < 0)
449 return 0;
450
451#if EPOLL_FALLBACK
452 backend_fd = ev_epoll_create ();
453 if (backend_fd < 0)
454 {
455 evsys_io_destroy (linuxaio_ctx);
456 return 0;
457 }
458
459 ev_io_init (EV_A_ &linuxaio_epoll_w, linuxaio_epoll_cb, backend_fd, EV_READ);
460 ev_set_priority (&linuxaio_epoll_w, EV_MAXPRI);
461 ev_io_start (EV_A_ &linuxaio_epoll_w);
462 ev_unref (EV_A); /* watcher should not keep loop alive */
463#endif
314 464
315 backend_modify = linuxaio_modify; 465 backend_modify = linuxaio_modify;
316 backend_poll = linuxaio_poll; 466 backend_poll = linuxaio_poll;
317 467
318 linuxaio_iocbpmax = 0; 468 linuxaio_iocbpmax = 0;
… …
327 477
328inline_size 478inline_size
329void 479void
330linuxaio_destroy (EV_P) 480linuxaio_destroy (EV_P)
331{ 481{
482#if EPOLL_FALLBACK
483 close (backend_fd);
484#endif
332 linuxaio_free_iocbp (EV_A); 485 linuxaio_free_iocbp (EV_A);
333 ev_io_destroy (linuxaio_ctx); 486 evsys_io_destroy (linuxaio_ctx);
334} 487}
335 488
336inline_size 489inline_size
337void 490void
338linuxaio_fork (EV_P) 491linuxaio_fork (EV_P)
339{ 492{
340 abort ();//D 493 /* this frees all iocbs, which is very heavy-handed */
341} 494 linuxaio_destroy (EV_A);
495 linuxaio_submitcnt = 0; /* all pointers were invalidated */
342 496
497 linuxaio_ctx = 0;
498 while (evsys_io_setup (EV_LINUXAIO_DEPTH, &linuxaio_ctx) < 0)
499 ev_syserr ("(libev) linuxaio io_setup");
500
501#if EPOLL_FALLBACK
502 while ((backend_fd = ev_epoll_create ()) < 0)
503 ev_syserr ("(libev) linuxaio epoll_create");
504
505 ev_io_stop (EV_A_ &linuxaio_epoll_w);
506 ev_io_init (EV_A_ &linuxaio_epoll_w, linuxaio_epoll_cb, backend_fd, EV_READ);
507 ev_io_start (EV_A_ &linuxaio_epoll_w);
508#endif
509
510 fd_rearm_all (EV_A);
511}
512

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