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1 | /* | |
2 | * QEMU posix-aio emulation | |
3 | * | |
4 | * Copyright IBM, Corp. 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <sys/ioctl.h> | |
15 | #include <sys/types.h> | |
16 | #include <pthread.h> | |
17 | #include <unistd.h> | |
18 | #include <errno.h> | |
19 | #include <time.h> | |
20 | #include <string.h> | |
21 | #include <stdlib.h> | |
22 | #include <stdio.h> | |
23 | ||
24 | #include "qemu-queue.h" | |
25 | #include "osdep.h" | |
26 | #include "sysemu.h" | |
27 | #include "qemu-common.h" | |
28 | #include "trace.h" | |
29 | #include "block_int.h" | |
30 | ||
31 | #include "block/raw-posix-aio.h" | |
32 | ||
33 | ||
34 | struct qemu_paiocb { | |
35 | BlockDriverAIOCB common; | |
36 | int aio_fildes; | |
37 | union { | |
38 | struct iovec *aio_iov; | |
39 | void *aio_ioctl_buf; | |
40 | }; | |
41 | int aio_niov; | |
42 | size_t aio_nbytes; | |
43 | #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */ | |
44 | int ev_signo; | |
45 | off_t aio_offset; | |
46 | ||
47 | QTAILQ_ENTRY(qemu_paiocb) node; | |
48 | int aio_type; | |
49 | ssize_t ret; | |
50 | int active; | |
51 | struct qemu_paiocb *next; | |
52 | ||
53 | int async_context_id; | |
54 | }; | |
55 | ||
56 | typedef struct PosixAioState { | |
57 | int rfd, wfd; | |
58 | struct qemu_paiocb *first_aio; | |
59 | } PosixAioState; | |
60 | ||
61 | ||
62 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; | |
63 | static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; | |
64 | static pthread_t thread_id; | |
65 | static pthread_attr_t attr; | |
66 | static int max_threads = 64; | |
67 | static int cur_threads = 0; | |
68 | static int idle_threads = 0; | |
69 | static QTAILQ_HEAD(, qemu_paiocb) request_list; | |
70 | ||
71 | #ifdef CONFIG_PREADV | |
72 | static int preadv_present = 1; | |
73 | #else | |
74 | static int preadv_present = 0; | |
75 | #endif | |
76 | ||
77 | static void die2(int err, const char *what) | |
78 | { | |
79 | fprintf(stderr, "%s failed: %s\n", what, strerror(err)); | |
80 | abort(); | |
81 | } | |
82 | ||
83 | static void die(const char *what) | |
84 | { | |
85 | die2(errno, what); | |
86 | } | |
87 | ||
88 | static void mutex_lock(pthread_mutex_t *mutex) | |
89 | { | |
90 | int ret = pthread_mutex_lock(mutex); | |
91 | if (ret) die2(ret, "pthread_mutex_lock"); | |
92 | } | |
93 | ||
94 | static void mutex_unlock(pthread_mutex_t *mutex) | |
95 | { | |
96 | int ret = pthread_mutex_unlock(mutex); | |
97 | if (ret) die2(ret, "pthread_mutex_unlock"); | |
98 | } | |
99 | ||
100 | static int cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, | |
101 | struct timespec *ts) | |
102 | { | |
103 | int ret = pthread_cond_timedwait(cond, mutex, ts); | |
104 | if (ret && ret != ETIMEDOUT) die2(ret, "pthread_cond_timedwait"); | |
105 | return ret; | |
106 | } | |
107 | ||
108 | static void cond_signal(pthread_cond_t *cond) | |
109 | { | |
110 | int ret = pthread_cond_signal(cond); | |
111 | if (ret) die2(ret, "pthread_cond_signal"); | |
112 | } | |
113 | ||
114 | static void thread_create(pthread_t *thread, pthread_attr_t *attr, | |
115 | void *(*start_routine)(void*), void *arg) | |
116 | { | |
117 | int ret = pthread_create(thread, attr, start_routine, arg); | |
118 | if (ret) die2(ret, "pthread_create"); | |
119 | } | |
120 | ||
121 | static ssize_t handle_aiocb_ioctl(struct qemu_paiocb *aiocb) | |
122 | { | |
123 | int ret; | |
124 | ||
125 | ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf); | |
126 | if (ret == -1) | |
127 | return -errno; | |
128 | ||
129 | /* | |
130 | * This looks weird, but the aio code only consideres a request | |
131 | * successful if it has written the number full number of bytes. | |
132 | * | |
133 | * Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command, | |
134 | * so in fact we return the ioctl command here to make posix_aio_read() | |
135 | * happy.. | |
136 | */ | |
137 | return aiocb->aio_nbytes; | |
138 | } | |
139 | ||
140 | static ssize_t handle_aiocb_flush(struct qemu_paiocb *aiocb) | |
141 | { | |
142 | int ret; | |
143 | ||
144 | ret = qemu_fdatasync(aiocb->aio_fildes); | |
145 | if (ret == -1) | |
146 | return -errno; | |
147 | return 0; | |
148 | } | |
149 | ||
150 | #ifdef CONFIG_PREADV | |
151 | ||
152 | static ssize_t | |
153 | qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) | |
154 | { | |
155 | return preadv(fd, iov, nr_iov, offset); | |
156 | } | |
157 | ||
158 | static ssize_t | |
159 | qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) | |
160 | { | |
161 | return pwritev(fd, iov, nr_iov, offset); | |
162 | } | |
163 | ||
164 | #else | |
165 | ||
166 | static ssize_t | |
167 | qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) | |
168 | { | |
169 | return -ENOSYS; | |
170 | } | |
171 | ||
172 | static ssize_t | |
173 | qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) | |
174 | { | |
175 | return -ENOSYS; | |
176 | } | |
177 | ||
178 | #endif | |
179 | ||
180 | static ssize_t handle_aiocb_rw_vector(struct qemu_paiocb *aiocb) | |
181 | { | |
182 | size_t offset = 0; | |
183 | ssize_t len; | |
184 | ||
185 | do { | |
186 | if (aiocb->aio_type & QEMU_AIO_WRITE) | |
187 | len = qemu_pwritev(aiocb->aio_fildes, | |
188 | aiocb->aio_iov, | |
189 | aiocb->aio_niov, | |
190 | aiocb->aio_offset + offset); | |
191 | else | |
192 | len = qemu_preadv(aiocb->aio_fildes, | |
193 | aiocb->aio_iov, | |
194 | aiocb->aio_niov, | |
195 | aiocb->aio_offset + offset); | |
196 | } while (len == -1 && errno == EINTR); | |
197 | ||
198 | if (len == -1) | |
199 | return -errno; | |
200 | return len; | |
201 | } | |
202 | ||
203 | static ssize_t handle_aiocb_rw_linear(struct qemu_paiocb *aiocb, char *buf) | |
204 | { | |
205 | ssize_t offset = 0; | |
206 | ssize_t len; | |
207 | ||
208 | while (offset < aiocb->aio_nbytes) { | |
209 | if (aiocb->aio_type & QEMU_AIO_WRITE) | |
210 | len = pwrite(aiocb->aio_fildes, | |
211 | (const char *)buf + offset, | |
212 | aiocb->aio_nbytes - offset, | |
213 | aiocb->aio_offset + offset); | |
214 | else | |
215 | len = pread(aiocb->aio_fildes, | |
216 | buf + offset, | |
217 | aiocb->aio_nbytes - offset, | |
218 | aiocb->aio_offset + offset); | |
219 | ||
220 | if (len == -1 && errno == EINTR) | |
221 | continue; | |
222 | else if (len == -1) { | |
223 | offset = -errno; | |
224 | break; | |
225 | } else if (len == 0) | |
226 | break; | |
227 | ||
228 | offset += len; | |
229 | } | |
230 | ||
231 | return offset; | |
232 | } | |
233 | ||
234 | static ssize_t handle_aiocb_rw(struct qemu_paiocb *aiocb) | |
235 | { | |
236 | ssize_t nbytes; | |
237 | char *buf; | |
238 | ||
239 | if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) { | |
240 | /* | |
241 | * If there is just a single buffer, and it is properly aligned | |
242 | * we can just use plain pread/pwrite without any problems. | |
243 | */ | |
244 | if (aiocb->aio_niov == 1) | |
245 | return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base); | |
246 | ||
247 | /* | |
248 | * We have more than one iovec, and all are properly aligned. | |
249 | * | |
250 | * Try preadv/pwritev first and fall back to linearizing the | |
251 | * buffer if it's not supported. | |
252 | */ | |
253 | if (preadv_present) { | |
254 | nbytes = handle_aiocb_rw_vector(aiocb); | |
255 | if (nbytes == aiocb->aio_nbytes) | |
256 | return nbytes; | |
257 | if (nbytes < 0 && nbytes != -ENOSYS) | |
258 | return nbytes; | |
259 | preadv_present = 0; | |
260 | } | |
261 | ||
262 | /* | |
263 | * XXX(hch): short read/write. no easy way to handle the reminder | |
264 | * using these interfaces. For now retry using plain | |
265 | * pread/pwrite? | |
266 | */ | |
267 | } | |
268 | ||
269 | /* | |
270 | * Ok, we have to do it the hard way, copy all segments into | |
271 | * a single aligned buffer. | |
272 | */ | |
273 | buf = qemu_blockalign(aiocb->common.bs, aiocb->aio_nbytes); | |
274 | if (aiocb->aio_type & QEMU_AIO_WRITE) { | |
275 | char *p = buf; | |
276 | int i; | |
277 | ||
278 | for (i = 0; i < aiocb->aio_niov; ++i) { | |
279 | memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len); | |
280 | p += aiocb->aio_iov[i].iov_len; | |
281 | } | |
282 | } | |
283 | ||
284 | nbytes = handle_aiocb_rw_linear(aiocb, buf); | |
285 | if (!(aiocb->aio_type & QEMU_AIO_WRITE)) { | |
286 | char *p = buf; | |
287 | size_t count = aiocb->aio_nbytes, copy; | |
288 | int i; | |
289 | ||
290 | for (i = 0; i < aiocb->aio_niov && count; ++i) { | |
291 | copy = count; | |
292 | if (copy > aiocb->aio_iov[i].iov_len) | |
293 | copy = aiocb->aio_iov[i].iov_len; | |
294 | memcpy(aiocb->aio_iov[i].iov_base, p, copy); | |
295 | p += copy; | |
296 | count -= copy; | |
297 | } | |
298 | } | |
299 | qemu_vfree(buf); | |
300 | ||
301 | return nbytes; | |
302 | } | |
303 | ||
304 | static void *aio_thread(void *unused) | |
305 | { | |
306 | pid_t pid; | |
307 | ||
308 | pid = getpid(); | |
309 | ||
310 | while (1) { | |
311 | struct qemu_paiocb *aiocb; | |
312 | ssize_t ret = 0; | |
313 | qemu_timeval tv; | |
314 | struct timespec ts; | |
315 | ||
316 | qemu_gettimeofday(&tv); | |
317 | ts.tv_sec = tv.tv_sec + 10; | |
318 | ts.tv_nsec = 0; | |
319 | ||
320 | mutex_lock(&lock); | |
321 | ||
322 | while (QTAILQ_EMPTY(&request_list) && | |
323 | !(ret == ETIMEDOUT)) { | |
324 | idle_threads++; | |
325 | ret = cond_timedwait(&cond, &lock, &ts); | |
326 | idle_threads--; | |
327 | } | |
328 | ||
329 | if (QTAILQ_EMPTY(&request_list)) | |
330 | break; | |
331 | ||
332 | aiocb = QTAILQ_FIRST(&request_list); | |
333 | QTAILQ_REMOVE(&request_list, aiocb, node); | |
334 | aiocb->active = 1; | |
335 | mutex_unlock(&lock); | |
336 | ||
337 | switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) { | |
338 | case QEMU_AIO_READ: | |
339 | case QEMU_AIO_WRITE: | |
340 | ret = handle_aiocb_rw(aiocb); | |
341 | break; | |
342 | case QEMU_AIO_FLUSH: | |
343 | ret = handle_aiocb_flush(aiocb); | |
344 | break; | |
345 | case QEMU_AIO_IOCTL: | |
346 | ret = handle_aiocb_ioctl(aiocb); | |
347 | break; | |
348 | default: | |
349 | fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type); | |
350 | ret = -EINVAL; | |
351 | break; | |
352 | } | |
353 | ||
354 | mutex_lock(&lock); | |
355 | aiocb->ret = ret; | |
356 | mutex_unlock(&lock); | |
357 | ||
358 | if (kill(pid, aiocb->ev_signo)) die("kill failed"); | |
359 | } | |
360 | ||
361 | cur_threads--; | |
362 | mutex_unlock(&lock); | |
363 | ||
364 | return NULL; | |
365 | } | |
366 | ||
367 | static void spawn_thread(void) | |
368 | { | |
369 | sigset_t set, oldset; | |
370 | ||
371 | cur_threads++; | |
372 | ||
373 | /* block all signals */ | |
374 | if (sigfillset(&set)) die("sigfillset"); | |
375 | if (sigprocmask(SIG_SETMASK, &set, &oldset)) die("sigprocmask"); | |
376 | ||
377 | thread_create(&thread_id, &attr, aio_thread, NULL); | |
378 | ||
379 | if (sigprocmask(SIG_SETMASK, &oldset, NULL)) die("sigprocmask restore"); | |
380 | } | |
381 | ||
382 | static void qemu_paio_submit(struct qemu_paiocb *aiocb) | |
383 | { | |
384 | aiocb->ret = -EINPROGRESS; | |
385 | aiocb->active = 0; | |
386 | mutex_lock(&lock); | |
387 | if (idle_threads == 0 && cur_threads < max_threads) | |
388 | spawn_thread(); | |
389 | QTAILQ_INSERT_TAIL(&request_list, aiocb, node); | |
390 | mutex_unlock(&lock); | |
391 | cond_signal(&cond); | |
392 | } | |
393 | ||
394 | static ssize_t qemu_paio_return(struct qemu_paiocb *aiocb) | |
395 | { | |
396 | ssize_t ret; | |
397 | ||
398 | mutex_lock(&lock); | |
399 | ret = aiocb->ret; | |
400 | mutex_unlock(&lock); | |
401 | ||
402 | return ret; | |
403 | } | |
404 | ||
405 | static int qemu_paio_error(struct qemu_paiocb *aiocb) | |
406 | { | |
407 | ssize_t ret = qemu_paio_return(aiocb); | |
408 | ||
409 | if (ret < 0) | |
410 | ret = -ret; | |
411 | else | |
412 | ret = 0; | |
413 | ||
414 | return ret; | |
415 | } | |
416 | ||
417 | static int posix_aio_process_queue(void *opaque) | |
418 | { | |
419 | PosixAioState *s = opaque; | |
420 | struct qemu_paiocb *acb, **pacb; | |
421 | int ret; | |
422 | int result = 0; | |
423 | int async_context_id = get_async_context_id(); | |
424 | ||
425 | for(;;) { | |
426 | pacb = &s->first_aio; | |
427 | for(;;) { | |
428 | acb = *pacb; | |
429 | if (!acb) | |
430 | return result; | |
431 | ||
432 | /* we're only interested in requests in the right context */ | |
433 | if (acb->async_context_id != async_context_id) { | |
434 | pacb = &acb->next; | |
435 | continue; | |
436 | } | |
437 | ||
438 | ret = qemu_paio_error(acb); | |
439 | if (ret == ECANCELED) { | |
440 | /* remove the request */ | |
441 | *pacb = acb->next; | |
442 | qemu_aio_release(acb); | |
443 | result = 1; | |
444 | } else if (ret != EINPROGRESS) { | |
445 | /* end of aio */ | |
446 | if (ret == 0) { | |
447 | ret = qemu_paio_return(acb); | |
448 | if (ret == acb->aio_nbytes) | |
449 | ret = 0; | |
450 | else | |
451 | ret = -EINVAL; | |
452 | } else { | |
453 | ret = -ret; | |
454 | } | |
455 | ||
456 | trace_paio_complete(acb, acb->common.opaque, ret); | |
457 | ||
458 | /* remove the request */ | |
459 | *pacb = acb->next; | |
460 | /* call the callback */ | |
461 | acb->common.cb(acb->common.opaque, ret); | |
462 | qemu_aio_release(acb); | |
463 | result = 1; | |
464 | break; | |
465 | } else { | |
466 | pacb = &acb->next; | |
467 | } | |
468 | } | |
469 | } | |
470 | ||
471 | return result; | |
472 | } | |
473 | ||
474 | static void posix_aio_read(void *opaque) | |
475 | { | |
476 | PosixAioState *s = opaque; | |
477 | ssize_t len; | |
478 | ||
479 | /* read all bytes from signal pipe */ | |
480 | for (;;) { | |
481 | char bytes[16]; | |
482 | ||
483 | len = read(s->rfd, bytes, sizeof(bytes)); | |
484 | if (len == -1 && errno == EINTR) | |
485 | continue; /* try again */ | |
486 | if (len == sizeof(bytes)) | |
487 | continue; /* more to read */ | |
488 | break; | |
489 | } | |
490 | ||
491 | posix_aio_process_queue(s); | |
492 | } | |
493 | ||
494 | static int posix_aio_flush(void *opaque) | |
495 | { | |
496 | PosixAioState *s = opaque; | |
497 | return !!s->first_aio; | |
498 | } | |
499 | ||
500 | static PosixAioState *posix_aio_state; | |
501 | ||
502 | static void aio_signal_handler(int signum) | |
503 | { | |
504 | if (posix_aio_state) { | |
505 | char byte = 0; | |
506 | ssize_t ret; | |
507 | ||
508 | ret = write(posix_aio_state->wfd, &byte, sizeof(byte)); | |
509 | if (ret < 0 && errno != EAGAIN) | |
510 | die("write()"); | |
511 | } | |
512 | ||
513 | qemu_service_io(); | |
514 | } | |
515 | ||
516 | static void paio_remove(struct qemu_paiocb *acb) | |
517 | { | |
518 | struct qemu_paiocb **pacb; | |
519 | ||
520 | /* remove the callback from the queue */ | |
521 | pacb = &posix_aio_state->first_aio; | |
522 | for(;;) { | |
523 | if (*pacb == NULL) { | |
524 | fprintf(stderr, "paio_remove: aio request not found!\n"); | |
525 | break; | |
526 | } else if (*pacb == acb) { | |
527 | *pacb = acb->next; | |
528 | qemu_aio_release(acb); | |
529 | break; | |
530 | } | |
531 | pacb = &(*pacb)->next; | |
532 | } | |
533 | } | |
534 | ||
535 | static void paio_cancel(BlockDriverAIOCB *blockacb) | |
536 | { | |
537 | struct qemu_paiocb *acb = (struct qemu_paiocb *)blockacb; | |
538 | int active = 0; | |
539 | ||
540 | trace_paio_cancel(acb, acb->common.opaque); | |
541 | ||
542 | mutex_lock(&lock); | |
543 | if (!acb->active) { | |
544 | QTAILQ_REMOVE(&request_list, acb, node); | |
545 | acb->ret = -ECANCELED; | |
546 | } else if (acb->ret == -EINPROGRESS) { | |
547 | active = 1; | |
548 | } | |
549 | mutex_unlock(&lock); | |
550 | ||
551 | if (active) { | |
552 | /* fail safe: if the aio could not be canceled, we wait for | |
553 | it */ | |
554 | while (qemu_paio_error(acb) == EINPROGRESS) | |
555 | ; | |
556 | } | |
557 | ||
558 | paio_remove(acb); | |
559 | } | |
560 | ||
561 | static AIOPool raw_aio_pool = { | |
562 | .aiocb_size = sizeof(struct qemu_paiocb), | |
563 | .cancel = paio_cancel, | |
564 | }; | |
565 | ||
566 | BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd, | |
567 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
568 | BlockDriverCompletionFunc *cb, void *opaque, int type) | |
569 | { | |
570 | struct qemu_paiocb *acb; | |
571 | ||
572 | acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); | |
573 | if (!acb) | |
574 | return NULL; | |
575 | acb->aio_type = type; | |
576 | acb->aio_fildes = fd; | |
577 | acb->ev_signo = SIGUSR2; | |
578 | acb->async_context_id = get_async_context_id(); | |
579 | ||
580 | if (qiov) { | |
581 | acb->aio_iov = qiov->iov; | |
582 | acb->aio_niov = qiov->niov; | |
583 | } | |
584 | acb->aio_nbytes = nb_sectors * 512; | |
585 | acb->aio_offset = sector_num * 512; | |
586 | ||
587 | acb->next = posix_aio_state->first_aio; | |
588 | posix_aio_state->first_aio = acb; | |
589 | ||
590 | trace_paio_submit(acb, opaque, sector_num, nb_sectors, type); | |
591 | qemu_paio_submit(acb); | |
592 | return &acb->common; | |
593 | } | |
594 | ||
595 | BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd, | |
596 | unsigned long int req, void *buf, | |
597 | BlockDriverCompletionFunc *cb, void *opaque) | |
598 | { | |
599 | struct qemu_paiocb *acb; | |
600 | ||
601 | acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); | |
602 | if (!acb) | |
603 | return NULL; | |
604 | acb->aio_type = QEMU_AIO_IOCTL; | |
605 | acb->aio_fildes = fd; | |
606 | acb->ev_signo = SIGUSR2; | |
607 | acb->async_context_id = get_async_context_id(); | |
608 | acb->aio_offset = 0; | |
609 | acb->aio_ioctl_buf = buf; | |
610 | acb->aio_ioctl_cmd = req; | |
611 | ||
612 | acb->next = posix_aio_state->first_aio; | |
613 | posix_aio_state->first_aio = acb; | |
614 | ||
615 | qemu_paio_submit(acb); | |
616 | return &acb->common; | |
617 | } | |
618 | ||
619 | int paio_init(void) | |
620 | { | |
621 | struct sigaction act; | |
622 | PosixAioState *s; | |
623 | int fds[2]; | |
624 | int ret; | |
625 | ||
626 | if (posix_aio_state) | |
627 | return 0; | |
628 | ||
629 | s = qemu_malloc(sizeof(PosixAioState)); | |
630 | ||
631 | sigfillset(&act.sa_mask); | |
632 | act.sa_flags = 0; /* do not restart syscalls to interrupt select() */ | |
633 | act.sa_handler = aio_signal_handler; | |
634 | sigaction(SIGUSR2, &act, NULL); | |
635 | ||
636 | s->first_aio = NULL; | |
637 | if (qemu_pipe(fds) == -1) { | |
638 | fprintf(stderr, "failed to create pipe\n"); | |
639 | return -1; | |
640 | } | |
641 | ||
642 | s->rfd = fds[0]; | |
643 | s->wfd = fds[1]; | |
644 | ||
645 | fcntl(s->rfd, F_SETFL, O_NONBLOCK); | |
646 | fcntl(s->wfd, F_SETFL, O_NONBLOCK); | |
647 | ||
648 | qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush, | |
649 | posix_aio_process_queue, s); | |
650 | ||
651 | ret = pthread_attr_init(&attr); | |
652 | if (ret) | |
653 | die2(ret, "pthread_attr_init"); | |
654 | ||
655 | ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); | |
656 | if (ret) | |
657 | die2(ret, "pthread_attr_setdetachstate"); | |
658 | ||
659 | QTAILQ_INIT(&request_list); | |
660 | ||
661 | posix_aio_state = s; | |
662 | return 0; | |
663 | } |