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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.68 by root, Tue Oct 24 03:40:25 2006 UTC vs.
Revision 1.85 by root, Sat Oct 28 23:32:29 2006 UTC

1#if __linux 1/* solaris */
2#define _POSIX_PTHREAD_SEMANTICS 1
3
4#if __linux && !defined(_GNU_SOURCE)
2# define _GNU_SOURCE 5# define _GNU_SOURCE
3#endif 6#endif
4 7
8/* just in case */
5#define _REENTRANT 1 9#define _REENTRANT 1
6 10
7#include <errno.h> 11#include <errno.h>
8 12
9#include "EXTERN.h" 13#include "EXTERN.h"
… …
39# else 43# else
40# error sendfile support requested but not available 44# error sendfile support requested but not available
41# endif 45# endif
42#endif 46#endif
43 47
48/* number of seconds after which idle threads exit */
49#define IDLE_TIMEOUT 10
50
44/* used for struct dirent, AIX doesn't provide it */ 51/* used for struct dirent, AIX doesn't provide it */
45#ifndef NAME_MAX 52#ifndef NAME_MAX
46# define NAME_MAX 4096 53# define NAME_MAX 4096
54#endif
55
56#ifndef PTHREAD_STACK_MIN
57/* care for broken platforms, e.g. windows */
58# define PTHREAD_STACK_MIN 16384
47#endif 59#endif
48 60
49#if __ia64 61#if __ia64
50# define STACKSIZE 65536 62# define STACKSIZE 65536
51#elif __i386 || __x86_64 /* 16k is unreasonably high :( */ 63#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
52# define STACKSIZE PTHREAD_STACK_MIN 64# define STACKSIZE PTHREAD_STACK_MIN
53#else 65#else
54# define STACKSIZE 16384 66# define STACKSIZE 16384
55#endif 67#endif
56 68
69/* wether word reads are potentially non-atomic.
70 * this is conservatice, likely most arches this runs
71 * on have atomic word read/writes.
72 */
73#ifndef WORDACCESS_UNSAFE
74# if __i386 || __x86_64
75# define WORDACCESS_UNSAFE 0
76# else
77# define WORDACCESS_UNSAFE 1
78# endif
79#endif
80
57/* buffer size for various temporary buffers */ 81/* buffer size for various temporary buffers */
58#define AIO_BUFSIZE 65536 82#define AIO_BUFSIZE 65536
59 83
60#define dBUF \ 84#define dBUF \
85 char *aio_buf; \
86 LOCK (wrklock); \
61 char *aio_buf = malloc (AIO_BUFSIZE); \ 87 self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
88 UNLOCK (wrklock); \
62 if (!aio_buf) \ 89 if (!aio_buf) \
63 return -1; 90 return -1;
64
65#define fBUF free (aio_buf)
66 91
67enum { 92enum {
68 REQ_QUIT, 93 REQ_QUIT,
69 REQ_OPEN, REQ_CLOSE, 94 REQ_OPEN, REQ_CLOSE,
70 REQ_READ, REQ_WRITE, REQ_READAHEAD, 95 REQ_READ, REQ_WRITE, REQ_READAHEAD,
71 REQ_SENDFILE, 96 REQ_SENDFILE,
72 REQ_STAT, REQ_LSTAT, REQ_FSTAT, 97 REQ_STAT, REQ_LSTAT, REQ_FSTAT,
73 REQ_FSYNC, REQ_FDATASYNC, 98 REQ_FSYNC, REQ_FDATASYNC,
74 REQ_UNLINK, REQ_RMDIR, REQ_RENAME, 99 REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
75 REQ_READDIR, 100 REQ_MKNOD, REQ_READDIR,
76 REQ_LINK, REQ_SYMLINK, 101 REQ_LINK, REQ_SYMLINK,
77 REQ_GROUP, REQ_NOP, 102 REQ_GROUP, REQ_NOP,
78 REQ_SLEEP, 103 REQ_BUSY,
79}; 104};
80 105
81#define AIO_REQ_KLASS "IO::AIO::REQ" 106#define AIO_REQ_KLASS "IO::AIO::REQ"
82#define AIO_GRP_KLASS "IO::AIO::GRP" 107#define AIO_GRP_KLASS "IO::AIO::GRP"
83 108
… …
120 DEFAULT_PRI = 0, 145 DEFAULT_PRI = 0,
121 PRI_BIAS = -PRI_MIN, 146 PRI_BIAS = -PRI_MIN,
122 NUM_PRI = PRI_MAX + PRI_BIAS + 1, 147 NUM_PRI = PRI_MAX + PRI_BIAS + 1,
123}; 148};
124 149
150#define AIO_TICKS ((1000000 + 1023) >> 10)
151
152static unsigned int max_poll_time = 0;
153static unsigned int max_poll_reqs = 0;
154
155/* calculcate time difference in ~1/AIO_TICKS of a second */
156static int tvdiff (struct timeval *tv1, struct timeval *tv2)
157{
158 return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
159 + ((tv2->tv_usec - tv1->tv_usec) >> 10);
160}
161
125static int next_pri = DEFAULT_PRI + PRI_BIAS; 162static int next_pri = DEFAULT_PRI + PRI_BIAS;
126 163
127static int started, wanted; 164static unsigned int started, idle, wanted;
128static volatile int nreqs;
129static int max_outstanding = 1<<30;
130static int respipe [2];
131 165
132#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) 166#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
133# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP 167# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
134#else 168#else
135# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER 169# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
136#endif 170#endif
137 171
172#define LOCK(mutex) pthread_mutex_lock (&(mutex))
173#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
174
175/* worker threads management */
176static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
177
178typedef struct worker {
179 /* locked by wrklock */
180 struct worker *prev, *next;
181
182 pthread_t tid;
183
184 /* locked by reslock, reqlock or wrklock */
185 aio_req req; /* currently processed request */
186 void *dbuf;
187 DIR *dirp;
188} worker;
189
190static worker wrk_first = { &wrk_first, &wrk_first, 0 };
191
192static void worker_clear (worker *wrk)
193{
194 if (wrk->dirp)
195 {
196 closedir (wrk->dirp);
197 wrk->dirp = 0;
198 }
199
200 if (wrk->dbuf)
201 {
202 free (wrk->dbuf);
203 wrk->dbuf = 0;
204 }
205}
206
207static void worker_free (worker *wrk)
208{
209 wrk->next->prev = wrk->prev;
210 wrk->prev->next = wrk->next;
211
212 free (wrk);
213}
214
215static volatile unsigned int nreqs, nready, npending;
216static volatile unsigned int max_idle = 4;
217static volatile unsigned int max_outstanding = 0xffffffff;
218static int respipe [2];
219
138static pthread_mutex_t reslock = AIO_MUTEX_INIT; 220static pthread_mutex_t reslock = AIO_MUTEX_INIT;
139static pthread_mutex_t reqlock = AIO_MUTEX_INIT; 221static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
140static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER; 222static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
223
224#if WORDACCESS_UNSAFE
225
226static unsigned int get_nready ()
227{
228 unsigned int retval;
229
230 LOCK (reqlock);
231 retval = nready;
232 UNLOCK (reqlock);
233
234 return retval;
235}
236
237static unsigned int get_npending ()
238{
239 unsigned int retval;
240
241 LOCK (reslock);
242 retval = npending;
243 UNLOCK (reslock);
244
245 return retval;
246}
247
248static unsigned int get_nthreads ()
249{
250 unsigned int retval;
251
252 LOCK (wrklock);
253 retval = started;
254 UNLOCK (wrklock);
255
256 return retval;
257}
258
259#else
260
261# define get_nready() nready
262# define get_npending() npending
263# define get_nthreads() started
264
265#endif
141 266
142/* 267/*
143 * a somewhat faster data structure might be nice, but 268 * a somewhat faster data structure might be nice, but
144 * with 8 priorities this actually needs <20 insns 269 * with 8 priorities this actually needs <20 insns
145 * per shift, the most expensive operation. 270 * per shift, the most expensive operation.
… …
191 } 316 }
192 317
193 abort (); 318 abort ();
194} 319}
195 320
321static int poll_cb ();
196static void req_invoke (aio_req req); 322static void req_invoke (aio_req req);
197static void req_free (aio_req req); 323static void req_free (aio_req req);
324static void req_cancel (aio_req req);
198 325
199/* must be called at most once */ 326/* must be called at most once */
200static SV *req_sv (aio_req req, const char *klass) 327static SV *req_sv (aio_req req, const char *klass)
201{ 328{
202 if (!req->self) 329 if (!req->self)
… …
264 req_invoke (grp); 391 req_invoke (grp);
265 req_free (grp); 392 req_free (grp);
266 } 393 }
267} 394}
268 395
269static void poll_wait ()
270{
271 fd_set rfd;
272
273 while (nreqs)
274 {
275 int size;
276#if !(__i386 || __x86_64) /* safe without sempahore on this archs */
277 pthread_mutex_lock (&reslock);
278#endif
279 size = res_queue.size;
280#if !(__i386 || __x86_64) /* safe without sempahore on this archs */
281 pthread_mutex_unlock (&reslock);
282#endif
283
284 if (size)
285 return;
286
287 FD_ZERO(&rfd);
288 FD_SET(respipe [0], &rfd);
289
290 select (respipe [0] + 1, &rfd, 0, 0, 0);
291 }
292}
293
294static void req_invoke (aio_req req) 396static void req_invoke (aio_req req)
295{ 397{
296 dSP; 398 dSP;
297 399
298 if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback)) 400 if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
299 { 401 {
300 errno = req->errorno;
301
302 ENTER; 402 ENTER;
303 SAVETMPS; 403 SAVETMPS;
304 PUSHMARK (SP); 404 PUSHMARK (SP);
305 EXTEND (SP, 1); 405 EXTEND (SP, 1);
306 406
… …
310 { 410 {
311 SV *rv = &PL_sv_undef; 411 SV *rv = &PL_sv_undef;
312 412
313 if (req->result >= 0) 413 if (req->result >= 0)
314 { 414 {
415 int i;
315 char *buf = req->data2ptr; 416 char *buf = req->data2ptr;
316 AV *av = newAV (); 417 AV *av = newAV ();
317 418
318 while (req->result) 419 av_extend (av, req->result - 1);
420
421 for (i = 0; i < req->result; ++i)
319 { 422 {
320 SV *sv = newSVpv (buf, 0); 423 SV *sv = newSVpv (buf, 0);
321 424
322 av_push (av, sv); 425 av_store (av, i, sv);
323 buf += SvCUR (sv) + 1; 426 buf += SvCUR (sv) + 1;
324 req->result--;
325 } 427 }
326 428
327 rv = sv_2mortal (newRV_noinc ((SV *)av)); 429 rv = sv_2mortal (newRV_noinc ((SV *)av));
328 } 430 }
329 431
… …
361 PUSHs (*av_fetch (av, i, 0)); 463 PUSHs (*av_fetch (av, i, 0));
362 } 464 }
363 break; 465 break;
364 466
365 case REQ_NOP: 467 case REQ_NOP:
366 case REQ_SLEEP: 468 case REQ_BUSY:
367 break; 469 break;
368 470
369 default: 471 default:
370 PUSHs (sv_2mortal (newSViv (req->result))); 472 PUSHs (sv_2mortal (newSViv (req->result)));
371 break; 473 break;
372 } 474 }
373 475
476 errno = req->errorno;
374 477
375 PUTBACK; 478 PUTBACK;
376 call_sv (req->callback, G_VOID | G_EVAL); 479 call_sv (req->callback, G_VOID | G_EVAL);
377 SPAGAIN; 480 SPAGAIN;
378 481
… …
413 SvREFCNT_dec (req->fh); 516 SvREFCNT_dec (req->fh);
414 SvREFCNT_dec (req->fh2); 517 SvREFCNT_dec (req->fh2);
415 SvREFCNT_dec (req->callback); 518 SvREFCNT_dec (req->callback);
416 Safefree (req->statdata); 519 Safefree (req->statdata);
417 520
418 if (req->type == REQ_READDIR && req->result >= 0) 521 if (req->type == REQ_READDIR)
419 free (req->data2ptr); 522 free (req->data2ptr);
420 523
421 Safefree (req); 524 Safefree (req);
422} 525}
423 526
527static void req_cancel_subs (aio_req grp)
528{
529 aio_req sub;
530
531 if (grp->type != REQ_GROUP)
532 return;
533
534 SvREFCNT_dec (grp->fh2);
535 grp->fh2 = 0;
536
537 for (sub = grp->grp_first; sub; sub = sub->grp_next)
538 req_cancel (sub);
539}
540
424static void req_cancel (aio_req req) 541static void req_cancel (aio_req req)
425{ 542{
426 req->flags |= FLAG_CANCELLED; 543 req->flags |= FLAG_CANCELLED;
427 544
428 if (req->type == REQ_GROUP) 545 req_cancel_subs (req);
429 {
430 aio_req sub;
431
432 for (sub = req->grp_first; sub; sub = sub->grp_next)
433 req_cancel (sub);
434 }
435}
436
437static int poll_cb ()
438{
439 dSP;
440 int count = 0;
441 int do_croak = 0;
442 aio_req req;
443
444 for (;;)
445 {
446 pthread_mutex_lock (&reslock);
447 req = reqq_shift (&res_queue);
448
449 if (req)
450 {
451 if (!res_queue.size)
452 {
453 /* read any signals sent by the worker threads */
454 char buf [32];
455 while (read (respipe [0], buf, 32) == 32)
456 ;
457 }
458 }
459
460 pthread_mutex_unlock (&reslock);
461
462 if (!req)
463 break;
464
465 --nreqs;
466
467 if (req->type == REQ_QUIT)
468 started--;
469 else if (req->type == REQ_GROUP && req->length)
470 {
471 req->fd = 1; /* mark request as delayed */
472 continue;
473 }
474 else
475 {
476 if (req->type == REQ_READ)
477 SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
478
479 if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
480 SvREADONLY_off (req->data);
481
482 if (req->statdata)
483 {
484 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
485 PL_laststatval = req->result;
486 PL_statcache = *(req->statdata);
487 }
488
489 req_invoke (req);
490
491 count++;
492 }
493
494 req_free (req);
495 }
496
497 return count;
498} 546}
499 547
500static void *aio_proc(void *arg); 548static void *aio_proc(void *arg);
501 549
502static void start_thread (void) 550static void start_thread (void)
503{ 551{
504 sigset_t fullsigset, oldsigset; 552 sigset_t fullsigset, oldsigset;
505 pthread_t tid;
506 pthread_attr_t attr; 553 pthread_attr_t attr;
554
555 worker *wrk = calloc (1, sizeof (worker));
556
557 if (!wrk)
558 croak ("unable to allocate worker thread data");
507 559
508 pthread_attr_init (&attr); 560 pthread_attr_init (&attr);
509 pthread_attr_setstacksize (&attr, STACKSIZE); 561 pthread_attr_setstacksize (&attr, STACKSIZE);
510 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); 562 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
563#ifdef PTHREAD_SCOPE_PROCESS
564 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
565#endif
511 566
512 sigfillset (&fullsigset); 567 sigfillset (&fullsigset);
568
569 LOCK (wrklock);
513 sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); 570 sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
514 571
515 if (pthread_create (&tid, &attr, aio_proc, 0) == 0) 572 if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
573 {
574 wrk->prev = &wrk_first;
575 wrk->next = wrk_first.next;
576 wrk_first.next->prev = wrk;
577 wrk_first.next = wrk;
516 started++; 578 ++started;
579 }
580 else
581 free (wrk);
517 582
518 sigprocmask (SIG_SETMASK, &oldsigset, 0); 583 sigprocmask (SIG_SETMASK, &oldsigset, 0);
584 UNLOCK (wrklock);
585}
586
587static void maybe_start_thread ()
588{
589 if (get_nthreads () >= wanted)
590 return;
591
592 /* todo: maybe use idle here, but might be less exact */
593 if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
594 return;
595
596 start_thread ();
519} 597}
520 598
521static void req_send (aio_req req) 599static void req_send (aio_req req)
522{ 600{
523 while (started < wanted && nreqs >= started)
524 start_thread ();
525
526 ++nreqs; 601 ++nreqs;
527 602
528 pthread_mutex_lock (&reqlock); 603 LOCK (reqlock);
604 ++nready;
529 reqq_push (&req_queue, req); 605 reqq_push (&req_queue, req);
530 pthread_cond_signal (&reqwait); 606 pthread_cond_signal (&reqwait);
531 pthread_mutex_unlock (&reqlock); 607 UNLOCK (reqlock);
532 608
533 if (nreqs > max_outstanding) 609 maybe_start_thread ();
534 for (;;)
535 {
536 poll_cb ();
537
538 if (nreqs <= max_outstanding)
539 break;
540
541 poll_wait ();
542 }
543} 610}
544 611
545static void end_thread (void) 612static void end_thread (void)
546{ 613{
547 aio_req req; 614 aio_req req;
… …
549 Newz (0, req, 1, aio_cb); 616 Newz (0, req, 1, aio_cb);
550 617
551 req->type = REQ_QUIT; 618 req->type = REQ_QUIT;
552 req->pri = PRI_MAX + PRI_BIAS; 619 req->pri = PRI_MAX + PRI_BIAS;
553 620
554 req_send (req); 621 LOCK (reqlock);
622 reqq_push (&req_queue, req);
623 pthread_cond_signal (&reqwait);
624 UNLOCK (reqlock);
625
626 LOCK (wrklock);
627 --started;
628 UNLOCK (wrklock);
629}
630
631static void set_max_idle (int nthreads)
632{
633 if (WORDACCESS_UNSAFE) LOCK (reqlock);
634 max_idle = nthreads <= 0 ? 1 : nthreads;
635 if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
555} 636}
556 637
557static void min_parallel (int nthreads) 638static void min_parallel (int nthreads)
558{ 639{
559 if (wanted < nthreads) 640 if (wanted < nthreads)
560 wanted = nthreads; 641 wanted = nthreads;
561} 642}
562 643
563static void max_parallel (int nthreads) 644static void max_parallel (int nthreads)
564{ 645{
565 int cur = started;
566
567 if (wanted > nthreads) 646 if (wanted > nthreads)
568 wanted = nthreads; 647 wanted = nthreads;
569 648
570 while (cur > wanted)
571 {
572 end_thread ();
573 cur--;
574 }
575
576 while (started > wanted) 649 while (started > wanted)
650 end_thread ();
651}
652
653static void poll_wait ()
654{
655 fd_set rfd;
656
657 while (nreqs)
658 {
659 int size;
660 if (WORDACCESS_UNSAFE) LOCK (reslock);
661 size = res_queue.size;
662 if (WORDACCESS_UNSAFE) UNLOCK (reslock);
663
664 if (size)
665 return;
666
667 maybe_start_thread ();
668
669 FD_ZERO(&rfd);
670 FD_SET(respipe [0], &rfd);
671
672 select (respipe [0] + 1, &rfd, 0, 0, 0);
577 { 673 }
674}
675
676static int poll_cb ()
677{
678 dSP;
679 int count = 0;
680 int maxreqs = max_poll_reqs;
681 int do_croak = 0;
682 struct timeval tv_start, tv_now;
683 aio_req req;
684
685 if (max_poll_time)
686 gettimeofday (&tv_start, 0);
687
688 for (;;)
689 {
690 for (;;)
691 {
692 maybe_start_thread ();
693
694 LOCK (reslock);
695 req = reqq_shift (&res_queue);
696
697 if (req)
698 {
699 --npending;
700
701 if (!res_queue.size)
702 {
703 /* read any signals sent by the worker threads */
704 char buf [32];
705 while (read (respipe [0], buf, 32) == 32)
706 ;
707 }
708 }
709
710 UNLOCK (reslock);
711
712 if (!req)
713 break;
714
715 --nreqs;
716
717 if (req->type == REQ_GROUP && req->length)
718 {
719 req->fd = 1; /* mark request as delayed */
720 continue;
721 }
722 else
723 {
724 if (req->type == REQ_READ)
725 SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
726
727 if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
728 SvREADONLY_off (req->data);
729
730 if (req->statdata)
731 {
732 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
733 PL_laststatval = req->result;
734 PL_statcache = *(req->statdata);
735 }
736
737 req_invoke (req);
738
739 count++;
740 }
741
742 req_free (req);
743
744 if (maxreqs && !--maxreqs)
745 break;
746
747 if (max_poll_time)
748 {
749 gettimeofday (&tv_now, 0);
750
751 if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
752 break;
753 }
754 }
755
756 if (nreqs <= max_outstanding)
757 break;
758
578 poll_wait (); 759 poll_wait ();
579 poll_cb (); 760
761 ++maxreqs;
580 } 762 }
763
764 return count;
581} 765}
582 766
583static void create_pipe () 767static void create_pipe ()
584{ 768{
585 if (pipe (respipe)) 769 if (pipe (respipe))
… …
609static ssize_t pread (int fd, void *buf, size_t count, off_t offset) 793static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
610{ 794{
611 ssize_t res; 795 ssize_t res;
612 off_t ooffset; 796 off_t ooffset;
613 797
614 pthread_mutex_lock (&preadwritelock); 798 LOCK (preadwritelock);
615 ooffset = lseek (fd, 0, SEEK_CUR); 799 ooffset = lseek (fd, 0, SEEK_CUR);
616 lseek (fd, offset, SEEK_SET); 800 lseek (fd, offset, SEEK_SET);
617 res = read (fd, buf, count); 801 res = read (fd, buf, count);
618 lseek (fd, ooffset, SEEK_SET); 802 lseek (fd, ooffset, SEEK_SET);
619 pthread_mutex_unlock (&preadwritelock); 803 UNLOCK (preadwritelock);
620 804
621 return res; 805 return res;
622} 806}
623 807
624static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset) 808static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
625{ 809{
626 ssize_t res; 810 ssize_t res;
627 off_t ooffset; 811 off_t ooffset;
628 812
629 pthread_mutex_lock (&preadwritelock); 813 LOCK (preadwritelock);
630 ooffset = lseek (fd, 0, SEEK_CUR); 814 ooffset = lseek (fd, 0, SEEK_CUR);
631 lseek (fd, offset, SEEK_SET); 815 lseek (fd, offset, SEEK_SET);
632 res = write (fd, buf, count); 816 res = write (fd, buf, count);
633 lseek (fd, offset, SEEK_SET); 817 lseek (fd, offset, SEEK_SET);
634 pthread_mutex_unlock (&preadwritelock); 818 UNLOCK (preadwritelock);
635 819
636 return res; 820 return res;
637} 821}
638#endif 822#endif
639 823
640#if !HAVE_FDATASYNC 824#if !HAVE_FDATASYNC
641# define fdatasync fsync 825# define fdatasync fsync
642#endif 826#endif
643 827
644#if !HAVE_READAHEAD 828#if !HAVE_READAHEAD
645# define readahead aio_readahead 829# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
646 830
647static ssize_t readahead (int fd, off_t offset, size_t count) 831static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
648{ 832{
649 dBUF; 833 dBUF;
650 834
651 while (count > 0) 835 while (count > 0)
652 { 836 {
… …
655 pread (fd, aio_buf, len, offset); 839 pread (fd, aio_buf, len, offset);
656 offset += len; 840 offset += len;
657 count -= len; 841 count -= len;
658 } 842 }
659 843
660 fBUF;
661
662 errno = 0; 844 errno = 0;
663} 845}
846
664#endif 847#endif
665 848
666#if !HAVE_READDIR_R 849#if !HAVE_READDIR_R
667# define readdir_r aio_readdir_r 850# define readdir_r aio_readdir_r
668 851
… …
671static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res) 854static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
672{ 855{
673 struct dirent *e; 856 struct dirent *e;
674 int errorno; 857 int errorno;
675 858
676 pthread_mutex_lock (&readdirlock); 859 LOCK (readdirlock);
677 860
678 e = readdir (dirp); 861 e = readdir (dirp);
679 errorno = errno; 862 errorno = errno;
680 863
681 if (e) 864 if (e)
… …
684 strcpy (ent->d_name, e->d_name); 867 strcpy (ent->d_name, e->d_name);
685 } 868 }
686 else 869 else
687 *res = 0; 870 *res = 0;
688 871
689 pthread_mutex_unlock (&readdirlock); 872 UNLOCK (readdirlock);
690 873
691 errno = errorno; 874 errno = errorno;
692 return e ? 0 : -1; 875 return e ? 0 : -1;
693} 876}
694#endif 877#endif
695 878
696/* sendfile always needs emulation */ 879/* sendfile always needs emulation */
697static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count) 880static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
698{ 881{
699 ssize_t res; 882 ssize_t res;
700 883
701 if (!count) 884 if (!count)
702 return 0; 885 return 0;
… …
713 { 896 {
714 off_t sbytes; 897 off_t sbytes;
715 res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0); 898 res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
716 899
717 if (res < 0 && sbytes) 900 if (res < 0 && sbytes)
718 /* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */ 901 /* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
719 res = sbytes; 902 res = sbytes;
720 } 903 }
721 904
722# elif __hpux 905# elif __hpux
723 res = sendfile (ofd, ifd, offset, count, 0, 0); 906 res = sendfile (ofd, ifd, offset, count, 0, 0);
… …
779 962
780 offset += cnt; 963 offset += cnt;
781 res += cnt; 964 res += cnt;
782 count -= cnt; 965 count -= cnt;
783 } 966 }
784
785 fBUF;
786 } 967 }
787 968
788 return res; 969 return res;
789} 970}
790 971
791/* read a full directory */ 972/* read a full directory */
792static int scandir_ (const char *path, void **namesp) 973static void scandir_ (aio_req req, worker *self)
793{ 974{
794 DIR *dirp; 975 DIR *dirp;
795 union 976 union
796 { 977 {
797 struct dirent d; 978 struct dirent d;
… …
802 int memlen = 4096; 983 int memlen = 4096;
803 int memofs = 0; 984 int memofs = 0;
804 int res = 0; 985 int res = 0;
805 int errorno; 986 int errorno;
806 987
807 dirp = opendir (path); 988 LOCK (wrklock);
808 if (!dirp) 989 self->dirp = dirp = opendir (req->dataptr);
809 return -1;
810
811 u = malloc (sizeof (*u)); 990 self->dbuf = u = malloc (sizeof (*u));
812 names = malloc (memlen); 991 req->data2ptr = names = malloc (memlen);
992 UNLOCK (wrklock);
813 993
814 if (u && names) 994 if (dirp && u && names)
815 for (;;) 995 for (;;)
816 { 996 {
817 errno = 0; 997 errno = 0;
818 readdir_r (dirp, &u->d, &entp); 998 readdir_r (dirp, &u->d, &entp);
819 999
… …
829 res++; 1009 res++;
830 1010
831 while (memofs + len > memlen) 1011 while (memofs + len > memlen)
832 { 1012 {
833 memlen *= 2; 1013 memlen *= 2;
1014 LOCK (wrklock);
834 names = realloc (names, memlen); 1015 req->data2ptr = names = realloc (names, memlen);
1016 UNLOCK (wrklock);
1017
835 if (!names) 1018 if (!names)
836 break; 1019 break;
837 } 1020 }
838 1021
839 memcpy (names + memofs, name, len); 1022 memcpy (names + memofs, name, len);
840 memofs += len; 1023 memofs += len;
841 } 1024 }
842 } 1025 }
843 1026
844 errorno = errno;
845 free (u);
846 closedir (dirp);
847
848 if (errorno) 1027 if (errno)
849 {
850 free (names);
851 errno = errorno;
852 res = -1; 1028 res = -1;
853 } 1029
854 1030 req->result = res;
855 *namesp = (void *)names;
856 return res;
857} 1031}
858 1032
859/*****************************************************************************/ 1033/*****************************************************************************/
860 1034
861static void *aio_proc (void *thr_arg) 1035static void *aio_proc (void *thr_arg)
862{ 1036{
863 aio_req req; 1037 aio_req req;
864 int type; 1038 struct timespec ts;
1039 worker *self = (worker *)thr_arg;
865 1040
866 do 1041 /* try to distribute timeouts somewhat evenly */
1042 ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
1043 * (1000000000UL / 1024UL);
1044
1045 for (;;)
867 { 1046 {
868 pthread_mutex_lock (&reqlock); 1047 ts.tv_sec = time (0) + IDLE_TIMEOUT;
1048
1049 LOCK (reqlock);
869 1050
870 for (;;) 1051 for (;;)
871 { 1052 {
872 req = reqq_shift (&req_queue); 1053 self->req = req = reqq_shift (&req_queue);
873 1054
874 if (req) 1055 if (req)
875 break; 1056 break;
876 1057
1058 ++idle;
1059
1060 if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
1061 == ETIMEDOUT)
1062 {
1063 if (idle > max_idle)
1064 {
1065 --idle;
1066 UNLOCK (reqlock);
1067 LOCK (wrklock);
1068 --started;
1069 UNLOCK (wrklock);
1070 goto quit;
1071 }
1072
1073 /* we are allowed to idle, so do so without any timeout */
877 pthread_cond_wait (&reqwait, &reqlock); 1074 pthread_cond_wait (&reqwait, &reqlock);
1075 ts.tv_sec = time (0) + IDLE_TIMEOUT;
1076 }
1077
1078 --idle;
878 } 1079 }
879 1080
880 pthread_mutex_unlock (&reqlock); 1081 --nready;
1082
1083 UNLOCK (reqlock);
881 1084
882 errno = 0; /* strictly unnecessary */ 1085 errno = 0; /* strictly unnecessary */
883 type = req->type; /* remember type for QUIT check */
884 1086
885 if (!(req->flags & FLAG_CANCELLED)) 1087 if (!(req->flags & FLAG_CANCELLED))
886 switch (type) 1088 switch (req->type)
887 { 1089 {
888 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; 1090 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
889 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; 1091 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
890 1092
891 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 1093 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
892 case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break; 1094 case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length, self); break;
893 1095
894 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 1096 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
895 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 1097 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
896 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; 1098 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
897 1099
… …
900 case REQ_UNLINK: req->result = unlink (req->dataptr); break; 1102 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
901 case REQ_RMDIR: req->result = rmdir (req->dataptr); break; 1103 case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
902 case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break; 1104 case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
903 case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break; 1105 case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
904 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break; 1106 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
1107 case REQ_MKNOD: req->result = mknod (req->data2ptr, req->mode, (dev_t)req->offset); break;
905 1108
906 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; 1109 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
907 case REQ_FSYNC: req->result = fsync (req->fd); break; 1110 case REQ_FSYNC: req->result = fsync (req->fd); break;
908 case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break; 1111 case REQ_READDIR: scandir_ (req, self); break;
909 1112
910 case REQ_SLEEP: 1113 case REQ_BUSY:
911 { 1114 {
912 struct timeval tv; 1115 struct timeval tv;
913 1116
914 tv.tv_sec = req->fd; 1117 tv.tv_sec = req->fd;
915 tv.tv_usec = req->fd2; 1118 tv.tv_usec = req->fd2;
… …
917 req->result = select (0, 0, 0, 0, &tv); 1120 req->result = select (0, 0, 0, 0, &tv);
918 } 1121 }
919 1122
920 case REQ_GROUP: 1123 case REQ_GROUP:
921 case REQ_NOP: 1124 case REQ_NOP:
1125 break;
1126
922 case REQ_QUIT: 1127 case REQ_QUIT:
923 break; 1128 goto quit;
924 1129
925 default: 1130 default:
926 req->result = ENOSYS; 1131 req->result = ENOSYS;
927 break; 1132 break;
928 } 1133 }
929 1134
930 req->errorno = errno; 1135 req->errorno = errno;
931 1136
932 pthread_mutex_lock (&reslock); 1137 LOCK (reslock);
1138
1139 ++npending;
933 1140
934 if (!reqq_push (&res_queue, req)) 1141 if (!reqq_push (&res_queue, req))
935 /* write a dummy byte to the pipe so fh becomes ready */ 1142 /* write a dummy byte to the pipe so fh becomes ready */
936 write (respipe [1], &respipe, 1); 1143 write (respipe [1], &respipe, 1);
937 1144
938 pthread_mutex_unlock (&reslock); 1145 self->req = 0;
1146 worker_clear (self);
1147
1148 UNLOCK (reslock);
939 } 1149 }
940 while (type != REQ_QUIT); 1150
1151quit:
1152 LOCK (wrklock);
1153 worker_free (self);
1154 UNLOCK (wrklock);
941 1155
942 return 0; 1156 return 0;
943} 1157}
944 1158
945/*****************************************************************************/ 1159/*****************************************************************************/
946 1160
947static void atfork_prepare (void) 1161static void atfork_prepare (void)
948{ 1162{
949 pthread_mutex_lock (&reqlock); 1163 LOCK (wrklock);
950 pthread_mutex_lock (&reslock); 1164 LOCK (reqlock);
1165 LOCK (reslock);
951#if !HAVE_PREADWRITE 1166#if !HAVE_PREADWRITE
952 pthread_mutex_lock (&preadwritelock); 1167 LOCK (preadwritelock);
953#endif 1168#endif
954#if !HAVE_READDIR_R 1169#if !HAVE_READDIR_R
955 pthread_mutex_lock (&readdirlock); 1170 LOCK (readdirlock);
956#endif 1171#endif
957} 1172}
958 1173
959static void atfork_parent (void) 1174static void atfork_parent (void)
960{ 1175{
961#if !HAVE_READDIR_R 1176#if !HAVE_READDIR_R
962 pthread_mutex_unlock (&readdirlock); 1177 UNLOCK (readdirlock);
963#endif 1178#endif
964#if !HAVE_PREADWRITE 1179#if !HAVE_PREADWRITE
965 pthread_mutex_unlock (&preadwritelock); 1180 UNLOCK (preadwritelock);
966#endif 1181#endif
967 pthread_mutex_unlock (&reslock); 1182 UNLOCK (reslock);
968 pthread_mutex_unlock (&reqlock); 1183 UNLOCK (reqlock);
1184 UNLOCK (wrklock);
969} 1185}
970 1186
971static void atfork_child (void) 1187static void atfork_child (void)
972{ 1188{
973 aio_req prv; 1189 aio_req prv;
974
975 started = 0;
976 1190
977 while (prv = reqq_shift (&req_queue)) 1191 while (prv = reqq_shift (&req_queue))
978 req_free (prv); 1192 req_free (prv);
979 1193
980 while (prv = reqq_shift (&res_queue)) 1194 while (prv = reqq_shift (&res_queue))
981 req_free (prv); 1195 req_free (prv);
982 1196
1197 while (wrk_first.next != &wrk_first)
1198 {
1199 worker *wrk = wrk_first.next;
1200
1201 if (wrk->req)
1202 req_free (wrk->req);
1203
1204 worker_clear (wrk);
1205 worker_free (wrk);
1206 }
1207
1208 started = 0;
1209 idle = 0;
1210 nreqs = 0;
1211 nready = 0;
1212 npending = 0;
1213
983 close (respipe [0]); 1214 close (respipe [0]);
984 close (respipe [1]); 1215 close (respipe [1]);
985 create_pipe (); 1216 create_pipe ();
986 1217
987 atfork_parent (); 1218 atfork_parent ();
… …
1013PROTOTYPES: ENABLE 1244PROTOTYPES: ENABLE
1014 1245
1015BOOT: 1246BOOT:
1016{ 1247{
1017 HV *stash = gv_stashpv ("IO::AIO", 1); 1248 HV *stash = gv_stashpv ("IO::AIO", 1);
1249
1018 newCONSTSUB (stash, "EXDEV", newSViv (EXDEV)); 1250 newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
1019 newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY)); 1251 newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
1020 newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY)); 1252 newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
1253 newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
1254 newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
1255 newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
1021 1256
1022 create_pipe (); 1257 create_pipe ();
1023 pthread_atfork (atfork_prepare, atfork_parent, atfork_child); 1258 pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
1024} 1259}
1025 1260
1026void 1261void
1027min_parallel (nthreads) 1262max_poll_reqs (int nreqs)
1028 int nthreads
1029 PROTOTYPE: $ 1263 PROTOTYPE: $
1264 CODE:
1265 max_poll_reqs = nreqs;
1030 1266
1031void 1267void
1032max_parallel (nthreads) 1268max_poll_time (double nseconds)
1033 int nthreads
1034 PROTOTYPE: $ 1269 PROTOTYPE: $
1270 CODE:
1271 max_poll_time = nseconds * AIO_TICKS;
1272
1273void
1274min_parallel (int nthreads)
1275 PROTOTYPE: $
1276
1277void
1278max_parallel (int nthreads)
1279 PROTOTYPE: $
1280
1281void
1282max_idle (int nthreads)
1283 PROTOTYPE: $
1284 CODE:
1285 set_max_idle (nthreads);
1035 1286
1036int 1287int
1037max_outstanding (nreqs) 1288max_outstanding (int maxreqs)
1038 int nreqs 1289 PROTOTYPE: $
1039 PROTOTYPE: $
1040 CODE: 1290 CODE:
1041 RETVAL = max_outstanding; 1291 RETVAL = max_outstanding;
1042 max_outstanding = nreqs; 1292 max_outstanding = maxreqs;
1293 OUTPUT:
1294 RETVAL
1043 1295
1044void 1296void
1045aio_open (pathname,flags,mode,callback=&PL_sv_undef) 1297aio_open (pathname,flags,mode,callback=&PL_sv_undef)
1046 SV * pathname 1298 SV * pathname
1047 int flags 1299 int flags
… …
1262 1514
1263 REQ_SEND; 1515 REQ_SEND;
1264} 1516}
1265 1517
1266void 1518void
1519aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
1520 SV * pathname
1521 SV * callback
1522 UV mode
1523 UV dev
1524 PPCODE:
1525{
1526 dREQ;
1527
1528 req->type = REQ_MKNOD;
1529 req->data = newSVsv (pathname);
1530 req->dataptr = SvPVbyte_nolen (req->data);
1531 req->mode = (mode_t)mode;
1532 req->offset = dev;
1533
1534 REQ_SEND;
1535}
1536
1537void
1267aio_sleep (delay,callback=&PL_sv_undef) 1538aio_busy (delay,callback=&PL_sv_undef)
1268 double delay 1539 double delay
1269 SV * callback 1540 SV * callback
1270 PPCODE: 1541 PPCODE:
1271{ 1542{
1272 dREQ; 1543 dREQ;
1273 1544
1274 req->type = REQ_SLEEP; 1545 req->type = REQ_BUSY;
1275 req->fd = delay < 0. ? 0 : delay; 1546 req->fd = delay < 0. ? 0 : delay;
1276 req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd); 1547 req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
1277 1548
1278 REQ_SEND; 1549 REQ_SEND;
1279} 1550}
… …
1302 req->type = REQ_NOP; 1573 req->type = REQ_NOP;
1303 1574
1304 REQ_SEND; 1575 REQ_SEND;
1305} 1576}
1306 1577
1307void 1578int
1308aioreq_pri (int pri = DEFAULT_PRI) 1579aioreq_pri (int pri = 0)
1309 CODE: 1580 PROTOTYPE: ;$
1581 CODE:
1582 RETVAL = next_pri - PRI_BIAS;
1583 if (items > 0)
1584 {
1310 if (pri < PRI_MIN) pri = PRI_MIN; 1585 if (pri < PRI_MIN) pri = PRI_MIN;
1311 if (pri > PRI_MAX) pri = PRI_MAX; 1586 if (pri > PRI_MAX) pri = PRI_MAX;
1312 next_pri = pri + PRI_BIAS; 1587 next_pri = pri + PRI_BIAS;
1588 }
1589 OUTPUT:
1590 RETVAL
1313 1591
1314void 1592void
1315aioreq_nice (int nice = 0) 1593aioreq_nice (int nice = 0)
1316 CODE: 1594 CODE:
1317 nice = next_pri - nice; 1595 nice = next_pri - nice;
1318 if (nice < PRI_MIN) nice = PRI_MIN; 1596 if (nice < PRI_MIN) nice = PRI_MIN;
1319 if (nice > PRI_MAX) nice = PRI_MAX; 1597 if (nice > PRI_MAX) nice = PRI_MAX;
1320 next_pri = nice + PRI_BIAS; 1598 next_pri = nice + PRI_BIAS;
1321 1599
1322void 1600void
1323flush () 1601flush ()
1324 PROTOTYPE: 1602 PROTOTYPE:
1325 CODE: 1603 CODE:
1326 while (nreqs) 1604 while (nreqs)
1327 { 1605 {
1328 poll_wait (); 1606 poll_wait ();
1329 poll_cb (); 1607 poll_cb (0);
1330 } 1608 }
1331 1609
1332void 1610void
1333poll() 1611poll()
1334 PROTOTYPE: 1612 PROTOTYPE:
1335 CODE: 1613 CODE:
1336 if (nreqs) 1614 if (nreqs)
1337 { 1615 {
1338 poll_wait (); 1616 poll_wait ();
1339 poll_cb (); 1617 poll_cb (0);
1340 } 1618 }
1341 1619
1342int 1620int
1343poll_fileno() 1621poll_fileno()
1344 PROTOTYPE: 1622 PROTOTYPE:
… …
1368 CODE: 1646 CODE:
1369 RETVAL = nreqs; 1647 RETVAL = nreqs;
1370 OUTPUT: 1648 OUTPUT:
1371 RETVAL 1649 RETVAL
1372 1650
1651int
1652nready()
1653 PROTOTYPE:
1654 CODE:
1655 RETVAL = get_nready ();
1656 OUTPUT:
1657 RETVAL
1658
1659int
1660npending()
1661 PROTOTYPE:
1662 CODE:
1663 RETVAL = get_npending ();
1664 OUTPUT:
1665 RETVAL
1666
1667int
1668nthreads()
1669 PROTOTYPE:
1670 CODE:
1671 if (WORDACCESS_UNSAFE) LOCK (wrklock);
1672 RETVAL = started;
1673 if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
1674 OUTPUT:
1675 RETVAL
1676
1373PROTOTYPES: DISABLE 1677PROTOTYPES: DISABLE
1374 1678
1375MODULE = IO::AIO PACKAGE = IO::AIO::REQ 1679MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1376 1680
1377void 1681void
… …
1419 } 1723 }
1420 } 1724 }
1421} 1725}
1422 1726
1423void 1727void
1728cancel_subs (aio_req_ornot req)
1729 CODE:
1730 req_cancel_subs (req);
1731
1732void
1424result (aio_req grp, ...) 1733result (aio_req grp, ...)
1425 CODE: 1734 CODE:
1426{ 1735{
1427 int i; 1736 int i;
1737 AV *av;
1738
1739 grp->errorno = errno;
1740
1428 AV *av = newAV (); 1741 av = newAV ();
1429 1742
1430 for (i = 1; i < items; ++i ) 1743 for (i = 1; i < items; ++i )
1431 av_push (av, newSVsv (ST (i))); 1744 av_push (av, newSVsv (ST (i)));
1432 1745
1433 SvREFCNT_dec (grp->data); 1746 SvREFCNT_dec (grp->data);
1434 grp->data = (SV *)av; 1747 grp->data = (SV *)av;
1435} 1748}
1749
1750void
1751errno (aio_req grp, int errorno = errno)
1752 CODE:
1753 grp->errorno = errorno;
1436 1754
1437void 1755void
1438limit (aio_req grp, int limit) 1756limit (aio_req grp, int limit)
1439 CODE: 1757 CODE:
1440 grp->fd2 = limit; 1758 grp->fd2 = limit;

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