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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.2 by root, Sun Jul 10 18:16:49 2005 UTC vs.
Revision 1.51 by root, Sun Oct 22 22:14:33 2006 UTC

1#define PERL_NO_GET_CONTEXT 1#define _REENTRANT 1
2#include <errno.h>
2 3
3#include "EXTERN.h" 4#include "EXTERN.h"
4#include "perl.h" 5#include "perl.h"
5#include "XSUB.h" 6#include "XSUB.h"
6 7
8#include "autoconf/config.h"
9
10#include <pthread.h>
11
12#include <stddef.h>
13#include <errno.h>
14#include <sys/time.h>
15#include <sys/select.h>
7#include <sys/types.h> 16#include <sys/types.h>
8#include <sys/stat.h> 17#include <sys/stat.h>
18#include <limits.h>
9#include <unistd.h> 19#include <unistd.h>
10#include <fcntl.h> 20#include <fcntl.h>
11#include <signal.h> 21#include <signal.h>
12#include <sched.h> 22#include <sched.h>
13#include <endian.h>
14 23
15#include <pthread.h> 24#if HAVE_SENDFILE
25# if __linux
26# include <sys/sendfile.h>
27# elif __freebsd
16#include <sys/syscall.h> 28# include <sys/socket.h>
29# include <sys/uio.h>
30# elif __hpux
31# include <sys/socket.h>
32# elif __solaris /* not yet */
33# include <sys/sendfile.h>
34# else
35# error sendfile support requested but not available
36# endif
37#endif
17 38
18typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ 39/* used for struct dirent, AIX doesn't provide it */
19typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ 40#ifndef NAME_MAX
20typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ 41# define NAME_MAX 4096
42#endif
21 43
22#if __i386 || __amd64
23# define STACKSIZE ( 256 * sizeof (long))
24#elif __ia64 44#if __ia64
25# define STACKSIZE (8192 * sizeof (long)) 45# define STACKSIZE 65536
26#else 46#else
27# define STACKSIZE ( 512 * sizeof (long)) 47# define STACKSIZE 8192
28#endif 48#endif
29 49
30enum { 50enum {
31 REQ_QUIT, 51 REQ_QUIT,
32 REQ_OPEN, REQ_CLOSE, 52 REQ_OPEN, REQ_CLOSE,
33 REQ_READ, REQ_WRITE, REQ_READAHEAD, 53 REQ_READ, REQ_WRITE, REQ_READAHEAD,
54 REQ_SENDFILE,
34 REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK, 55 REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35 REQ_FSYNC, REQ_FDATASYNC, 56 REQ_FSYNC, REQ_FDATASYNC,
57 REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
58 REQ_READDIR,
59 REQ_LINK, REQ_SYMLINK,
60 REQ_SLEEP,
61 REQ_GROUP,
36}; 62};
37 63
64#define AIO_REQ_KLASS "IO::AIO::REQ"
65#define AIO_GRP_KLASS "IO::AIO::GRP"
66
38typedef struct aio_cb { 67typedef struct aio_cb
68{
39 struct aio_cb *next; 69 struct aio_cb *volatile next;
40 70
41 int type; 71 struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
42 72
43 int fd; 73 SV *self; /* the perl counterpart of this request, if any */
74
75 SV *data, *callback;
76 SV *fh, *fh2;
77 void *dataptr, *data2ptr;
78 Stat_t *statdata;
44 off_t offset; 79 off_t offset;
45 size_t length; 80 size_t length;
46 ssize_t result; 81 ssize_t result;
82
83 int type;
84 int fd, fd2;
85 int errorno;
86 STRLEN dataoffset;
47 mode_t mode; /* open */ 87 mode_t mode; /* open */
48 int errorno; 88 unsigned char cancelled;
49 SV *data, *callback;
50 void *dataptr;
51 STRLEN dataoffset;
52
53 Stat_t *statdata;
54} aio_cb; 89} aio_cb;
55 90
56typedef aio_cb *aio_req; 91typedef aio_cb *aio_req;
92typedef aio_cb *aio_req_ornot;
57 93
58static int started; 94static int started, wanted;
59static int nreqs; 95static volatile int nreqs;
96static int max_outstanding = 1<<30;
60static int reqpipe[2], respipe[2]; 97static int respipe [2];
61 98
99static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
100static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
101static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
102
62static aio_req qs, qe; /* queue start, queue end */ 103static volatile aio_req reqs, reqe; /* queue start, queue end */
104static volatile aio_req ress, rese; /* queue start, queue end */
63 105
64static void *aio_proc(void *arg); 106static void req_invoke (aio_req req);
107static void req_free (aio_req req);
65 108
66static void 109/* must be called at most once */
67start_thread (void) 110static SV *req_sv (aio_req req, const char *klass)
68{ 111{
69 sigset_t fullsigset, oldsigset; 112 if (!req->self)
70 pthread_t tid;
71 pthread_attr_t attr;
72
73 pthread_attr_init (&attr);
74 pthread_attr_setstacksize (&attr, STACKSIZE);
75 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
76
77 sigfillset (&fullsigset);
78 sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
79
80 if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
81 started++;
82
83 sigprocmask (SIG_SETMASK, &oldsigset, 0);
84}
85
86static void
87send_reqs (void)
88{
89 /* this write is atomic */
90 while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
91 { 113 {
92 qs = qs->next; 114 req->self = (SV *)newHV ();
93 if (!qs) qe = 0; 115 sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
94 } 116 }
95}
96 117
97static void 118 return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
98send_req (aio_req req) 119}
99{
100 nreqs++;
101 req->next = 0;
102 120
103 if (qe) 121static aio_req SvAIO_REQ (SV *sv)
104 { 122{
105 qe->next = req; 123 if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
106 qe = req; 124 croak ("object of class " AIO_REQ_KLASS " expected");
125
126 MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
127
128 return mg ? (aio_req)mg->mg_ptr : 0;
129}
130
131static void aio_grp_feed (aio_req grp)
132{
133 while (grp->length < grp->fd2)
107 } 134 {
108 else 135 int old_len = grp->length;
109 qe = qs = req;
110 136
111 send_reqs (); 137 if (grp->fh2 && SvOK (grp->fh2))
112} 138 {
139 dSP;
113 140
114static void 141 ENTER;
115end_thread (void) 142 SAVETMPS;
116{ 143 PUSHMARK (SP);
117 aio_req req; 144 XPUSHs (req_sv (grp, AIO_GRP_KLASS));
118 New (0, req, 1, aio_cb); 145 PUTBACK;
119 req->type = REQ_QUIT; 146 call_sv (grp->fh2, G_VOID | G_EVAL);
147 SPAGAIN;
148 FREETMPS;
149 LEAVE;
150 }
120 151
121 send_req (req); 152 /* stop if no progress has been made */
122} 153 if (old_len == grp->length)
123 154 {
124static void 155 SvREFCNT_dec (grp->fh2);
125read_write (pTHX_ 156 grp->fh2 = 0;
126 int dowrite, int fd, off_t offset, size_t length, 157 break;
127 SV *data, STRLEN dataoffset, SV *callback) 158 }
128{
129 aio_req req;
130 STRLEN svlen;
131 char *svptr = SvPV (data, svlen);
132
133 SvUPGRADE (data, SVt_PV);
134 SvPOK_on (data);
135
136 if (dataoffset < 0)
137 dataoffset += svlen;
138
139 if (dataoffset < 0 || dataoffset > svlen)
140 croak ("data offset outside of string");
141
142 if (dowrite)
143 { 159 }
144 /* write: check length and adjust. */ 160}
145 if (length < 0 || length + dataoffset > svlen) 161
146 length = svlen - dataoffset; 162static void aio_grp_dec (aio_req grp)
163{
164 --grp->length;
165
166 /* call feeder, if applicable */
167 aio_grp_feed (grp);
168
169 /* finish, if done */
170 if (!grp->length && grp->fd)
147 } 171 {
148 else 172 req_invoke (grp);
173 req_free (grp);
149 { 174 }
150 /* read: grow scalar as necessary */ 175}
151 svptr = SvGROW (data, length + dataoffset); 176
177static void poll_wait ()
178{
179 if (nreqs && !ress)
152 } 180 {
153
154 if (length < 0)
155 croak ("length must not be negative");
156
157 Newz (0, req, 1, aio_cb);
158
159 if (!req)
160 croak ("out of memory during aio_req allocation");
161
162 req->type = dowrite ? REQ_WRITE : REQ_READ;
163 req->fd = fd;
164 req->offset = offset;
165 req->length = length;
166 req->data = SvREFCNT_inc (data);
167 req->dataptr = (char *)svptr + dataoffset;
168 req->callback = SvREFCNT_inc (callback);
169
170 send_req (req);
171}
172
173static void
174poll_wait ()
175{
176 fd_set rfd; 181 fd_set rfd;
177 FD_ZERO(&rfd); 182 FD_ZERO(&rfd);
178 FD_SET(respipe[0], &rfd); 183 FD_SET(respipe [0], &rfd);
179 184
180 select (respipe[0] + 1, &rfd, 0, 0, 0); 185 select (respipe [0] + 1, &rfd, 0, 0, 0);
186 }
181} 187}
182 188
183static int 189static void req_invoke (aio_req req)
184poll_cb (pTHX) 190{
191 dSP;
192 int errorno = errno;
193
194 if (req->cancelled || !SvOK (req->callback))
195 return;
196
197 errno = req->errorno;
198
199 ENTER;
200 SAVETMPS;
201 PUSHMARK (SP);
202 EXTEND (SP, 1);
203
204 switch (req->type)
205 {
206 case REQ_READDIR:
207 {
208 SV *rv = &PL_sv_undef;
209
210 if (req->result >= 0)
211 {
212 char *buf = req->data2ptr;
213 AV *av = newAV ();
214
215 while (req->result)
216 {
217 SV *sv = newSVpv (buf, 0);
218
219 av_push (av, sv);
220 buf += SvCUR (sv) + 1;
221 req->result--;
222 }
223
224 rv = sv_2mortal (newRV_noinc ((SV *)av));
225 }
226
227 PUSHs (rv);
228 }
229 break;
230
231 case REQ_OPEN:
232 {
233 /* convert fd to fh */
234 SV *fh;
235
236 PUSHs (sv_2mortal (newSViv (req->result)));
237 PUTBACK;
238 call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
239 SPAGAIN;
240
241 fh = SvREFCNT_inc (POPs);
242
243 PUSHMARK (SP);
244 XPUSHs (sv_2mortal (fh));
245 }
246 break;
247
248 case REQ_GROUP:
249 req->fd = 2; /* mark group as finished */
250
251 if (req->data)
252 {
253 int i;
254 AV *av = (AV *)req->data;
255
256 EXTEND (SP, AvFILL (av) + 1);
257 for (i = 0; i <= AvFILL (av); ++i)
258 PUSHs (*av_fetch (av, i, 0));
259 }
260 break;
261
262 case REQ_SLEEP:
263 break;
264
265 default:
266 PUSHs (sv_2mortal (newSViv (req->result)));
267 break;
268 }
269
270
271 PUTBACK;
272 call_sv (req->callback, G_VOID | G_EVAL);
273 SPAGAIN;
274
275 FREETMPS;
276 LEAVE;
277
278 errno = errorno;
279
280 if (SvTRUE (ERRSV))
281 {
282 req_free (req);
283 croak (0);
284 }
285}
286
287static void req_free (aio_req req)
288{
289 if (req->grp)
290 {
291 aio_req grp = req->grp;
292
293 /* unlink request */
294 if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
295 if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
296
297 if (grp->grp_first == req)
298 grp->grp_first = req->grp_next;
299
300 aio_grp_dec (grp);
301 }
302
303 if (req->self)
304 {
305 sv_unmagic (req->self, PERL_MAGIC_ext);
306 SvREFCNT_dec (req->self);
307 }
308
309 SvREFCNT_dec (req->data);
310 SvREFCNT_dec (req->fh);
311 SvREFCNT_dec (req->fh2);
312 SvREFCNT_dec (req->callback);
313 Safefree (req->statdata);
314
315 if (req->type == REQ_READDIR && req->result >= 0)
316 free (req->data2ptr);
317
318 Safefree (req);
319}
320
321static void req_cancel (aio_req req)
322{
323 req->cancelled = 1;
324
325 if (req->type == REQ_GROUP)
326 {
327 aio_req sub;
328
329 for (sub = req->grp_first; sub; sub = sub->grp_next)
330 req_cancel (sub);
331 }
332}
333
334static int poll_cb ()
185{ 335{
186 dSP; 336 dSP;
187 int count = 0; 337 int count = 0;
338 int do_croak = 0;
188 aio_req req; 339 aio_req req;
189 340
190 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 341 for (;;)
191 { 342 {
343 pthread_mutex_lock (&reslock);
344 req = ress;
345
346 if (req)
347 {
348 ress = req->next;
349
350 if (!ress)
351 {
352 /* read any signals sent by the worker threads */
353 char buf [32];
354 while (read (respipe [0], buf, 32) == 32)
355 ;
356
357 rese = 0;
358 }
359 }
360
361 pthread_mutex_unlock (&reslock);
362
363 if (!req)
364 break;
365
192 nreqs--; 366 --nreqs;
193 367
194 if (req->type == REQ_QUIT) 368 if (req->type == REQ_QUIT)
195 started--; 369 started--;
370 else if (req->type == REQ_GROUP && req->length)
371 {
372 req->fd = 1; /* mark request as delayed */
373 continue;
374 }
196 else 375 else
197 { 376 {
198 int errorno = errno;
199 errno = req->errorno;
200
201 if (req->type == REQ_READ) 377 if (req->type == REQ_READ)
202 SvCUR_set (req->data, req->dataoffset 378 SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
203 + req->result > 0 ? req->result : 0);
204 379
380 if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
381 SvREADONLY_off (req->data);
382
205 if (req->data) 383 if (req->statdata)
206 SvREFCNT_dec (req->data);
207
208 if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
209 { 384 {
210 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; 385 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
211 PL_laststatval = req->result; 386 PL_laststatval = req->result;
212 PL_statcache = *(req->statdata); 387 PL_statcache = *(req->statdata);
213
214 Safefree (req->statdata);
215 } 388 }
216 389
217 PUSHMARK (SP); 390 req_invoke (req);
218 XPUSHs (sv_2mortal (newSViv (req->result)));
219 391
220 if (req->type == REQ_OPEN)
221 {
222 /* convert fd to fh */
223 SV *fh;
224
225 PUTBACK;
226 call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
227 SPAGAIN;
228
229 fh = POPs;
230
231 PUSHMARK (SP);
232 XPUSHs (fh);
233 }
234
235 PUTBACK;
236 call_sv (req->callback, G_VOID | G_EVAL);
237 SPAGAIN;
238
239 if (req->callback)
240 SvREFCNT_dec (req->callback);
241
242 errno = errorno;
243 count++; 392 count++;
244 } 393 }
245 394
246 Safefree (req); 395 req_free (req);
247 } 396 }
248
249 if (qs)
250 send_reqs ();
251 397
252 return count; 398 return count;
253} 399}
254 400
255static void * 401static void *aio_proc(void *arg);
256aio_proc (void *thr_arg) 402
403static void start_thread (void)
404{
405 sigset_t fullsigset, oldsigset;
406 pthread_t tid;
407 pthread_attr_t attr;
408
409 pthread_attr_init (&attr);
410 pthread_attr_setstacksize (&attr, STACKSIZE);
411 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
412
413 sigfillset (&fullsigset);
414 sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
415
416 if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
417 started++;
418
419 sigprocmask (SIG_SETMASK, &oldsigset, 0);
420}
421
422static void req_send (aio_req req)
423{
424 while (started < wanted && nreqs >= started)
425 start_thread ();
426
427 ++nreqs;
428
429 pthread_mutex_lock (&reqlock);
430
431 req->next = 0;
432
433 if (reqe)
434 {
435 reqe->next = req;
436 reqe = req;
437 }
438 else
439 reqe = reqs = req;
440
441 pthread_cond_signal (&reqwait);
442 pthread_mutex_unlock (&reqlock);
443
444 if (nreqs > max_outstanding)
445 for (;;)
446 {
447 poll_cb ();
448
449 if (nreqs <= max_outstanding)
450 break;
451
452 poll_wait ();
453 }
454}
455
456static void end_thread (void)
257{ 457{
258 aio_req req; 458 aio_req req;
459 Newz (0, req, 1, aio_cb);
460 req->type = REQ_QUIT;
259 461
260 /* then loop */ 462 req_send (req);
261 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 463}
464
465static void min_parallel (int nthreads)
466{
467 if (wanted < nthreads)
468 wanted = nthreads;
469}
470
471static void max_parallel (int nthreads)
472{
473 int cur = started;
474
475 if (wanted > nthreads)
476 wanted = nthreads;
477
478 while (cur > wanted)
479 {
480 end_thread ();
481 cur--;
262 { 482 }
483
484 while (started > wanted)
485 {
486 poll_wait ();
487 poll_cb ();
488 }
489}
490
491static void create_pipe ()
492{
493 if (pipe (respipe))
494 croak ("unable to initialize result pipe");
495
496 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
497 croak ("cannot set result pipe to nonblocking mode");
498
499 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
500 croak ("cannot set result pipe to nonblocking mode");
501}
502
503/*****************************************************************************/
504/* work around various missing functions */
505
506#if !HAVE_PREADWRITE
507# define pread aio_pread
508# define pwrite aio_pwrite
509
510/*
511 * make our pread/pwrite safe against themselves, but not against
512 * normal read/write by using a mutex. slows down execution a lot,
513 * but that's your problem, not mine.
514 */
515static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
516
517static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
518{
519 ssize_t res;
520 off_t ooffset;
521
522 pthread_mutex_lock (&preadwritelock);
523 ooffset = lseek (fd, 0, SEEK_CUR);
524 lseek (fd, offset, SEEK_SET);
525 res = read (fd, buf, count);
526 lseek (fd, ooffset, SEEK_SET);
527 pthread_mutex_unlock (&preadwritelock);
528
529 return res;
530}
531
532static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
533{
534 ssize_t res;
535 off_t ooffset;
536
537 pthread_mutex_lock (&preadwritelock);
538 ooffset = lseek (fd, 0, SEEK_CUR);
539 lseek (fd, offset, SEEK_SET);
540 res = write (fd, buf, count);
541 lseek (fd, offset, SEEK_SET);
542 pthread_mutex_unlock (&preadwritelock);
543
544 return res;
545}
546#endif
547
548#if !HAVE_FDATASYNC
549# define fdatasync fsync
550#endif
551
552#if !HAVE_READAHEAD
553# define readahead aio_readahead
554
555static ssize_t readahead (int fd, off_t offset, size_t count)
556{
557 char readahead_buf[4096];
558
559 while (count > 0)
560 {
561 size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
562
563 pread (fd, readahead_buf, len, offset);
564 offset += len;
565 count -= len;
566 }
567
568 errno = 0;
569}
570#endif
571
572#if !HAVE_READDIR_R
573# define readdir_r aio_readdir_r
574
575static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
576
577static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
578{
579 struct dirent *e;
580 int errorno;
581
582 pthread_mutex_lock (&readdirlock);
583
584 e = readdir (dirp);
585 errorno = errno;
586
587 if (e)
588 {
589 *res = ent;
590 strcpy (ent->d_name, e->d_name);
591 }
592 else
593 *res = 0;
594
595 pthread_mutex_unlock (&readdirlock);
596
597 errno = errorno;
598 return e ? 0 : -1;
599}
600#endif
601
602/* sendfile always needs emulation */
603static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
604{
605 ssize_t res;
606
607 if (!count)
608 return 0;
609
610#if HAVE_SENDFILE
611# if __linux
612 res = sendfile (ofd, ifd, &offset, count);
613
614# elif __freebsd
615 /*
616 * Of course, the freebsd sendfile is a dire hack with no thoughts
617 * wasted on making it similar to other I/O functions.
618 */
619 {
620 off_t sbytes;
621 res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
622
623 if (res < 0 && sbytes)
624 /* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
625 res = sbytes;
626 }
627
628# elif __hpux
629 res = sendfile (ofd, ifd, offset, count, 0, 0);
630
631# elif __solaris
632 {
633 struct sendfilevec vec;
634 size_t sbytes;
635
636 vec.sfv_fd = ifd;
637 vec.sfv_flag = 0;
638 vec.sfv_off = offset;
639 vec.sfv_len = count;
640
641 res = sendfilev (ofd, &vec, 1, &sbytes);
642
643 if (res < 0 && sbytes)
644 res = sbytes;
645 }
646
647# endif
648#else
649 res = -1;
650 errno = ENOSYS;
651#endif
652
653 if (res < 0
654 && (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
655#if __solaris
656 || errno == EAFNOSUPPORT || errno == EPROTOTYPE
657#endif
658 )
659 )
660 {
661 /* emulate sendfile. this is a major pain in the ass */
662 char buf[4096];
663 res = 0;
664
665 while (count)
666 {
667 ssize_t cnt;
668
669 cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
670
671 if (cnt <= 0)
672 {
673 if (cnt && !res) res = -1;
674 break;
675 }
676
677 cnt = write (ofd, buf, cnt);
678
679 if (cnt <= 0)
680 {
681 if (cnt && !res) res = -1;
682 break;
683 }
684
685 offset += cnt;
686 res += cnt;
687 count -= cnt;
688 }
689 }
690
691 return res;
692}
693
694/* read a full directory */
695static int scandir_ (const char *path, void **namesp)
696{
697 DIR *dirp = opendir (path);
698 union
699 {
700 struct dirent d;
701 char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
702 } u;
703 struct dirent *entp;
704 char *name, *names;
705 int memlen = 4096;
706 int memofs = 0;
707 int res = 0;
708 int errorno;
709
710 if (!dirp)
711 return -1;
712
713 names = malloc (memlen);
714
715 for (;;)
716 {
717 errno = 0, readdir_r (dirp, &u.d, &entp);
718
719 if (!entp)
720 break;
721
722 name = entp->d_name;
723
724 if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
725 {
726 int len = strlen (name) + 1;
727
728 res++;
729
730 while (memofs + len > memlen)
731 {
732 memlen *= 2;
733 names = realloc (names, memlen);
734 if (!names)
735 break;
736 }
737
738 memcpy (names + memofs, name, len);
739 memofs += len;
740 }
741 }
742
743 errorno = errno;
744 closedir (dirp);
745
746 if (errorno)
747 {
748 free (names);
749 errno = errorno;
750 res = -1;
751 }
752
753 *namesp = (void *)names;
754 return res;
755}
756
757/*****************************************************************************/
758
759static void *aio_proc (void *thr_arg)
760{
761 aio_req req;
762 int type;
763
764 do
765 {
766 pthread_mutex_lock (&reqlock);
767
768 for (;;)
769 {
770 req = reqs;
771
772 if (reqs)
773 {
774 reqs = reqs->next;
775 if (!reqs) reqe = 0;
776 }
777
778 if (req)
779 break;
780
781 pthread_cond_wait (&reqwait, &reqlock);
782 }
783
784 pthread_mutex_unlock (&reqlock);
785
263 errno = 0; /* strictly unnecessary */ 786 errno = 0; /* strictly unnecessary */
264 787
265 switch (req->type) 788 if (!req->cancelled)
789 switch (type = req->type) /* remember type for QUIT check */
790 {
791 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
792 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
793
794 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
795 case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
796
797 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
798 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
799 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
800
801 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
802 case REQ_CLOSE: req->result = close (req->fd); break;
803 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
804 case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
805 case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
806 case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
807 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
808
809 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
810 case REQ_FSYNC: req->result = fsync (req->fd); break;
811 case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
812
813 case REQ_SLEEP:
814 {
815 struct timeval tv;
816
817 tv.tv_sec = req->fd;
818 tv.tv_usec = req->fd2;
819
820 req->result = select (0, 0, 0, 0, &tv);
821 }
822
823 case REQ_QUIT:
824 break;
825
826 default:
827 req->result = ENOSYS;
828 break;
829 }
830
831 req->errorno = errno;
832
833 pthread_mutex_lock (&reslock);
834
835 req->next = 0;
836
837 printf ("queue rese %p\n", rese);//D
838 if (rese)
266 { 839 {
267 case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break; 840 rese->next = req;
268 case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break; 841 rese = req;
269#if SYS_readahead 842 }
270 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 843 else
271#else 844 {
272 case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break; 845 rese = ress = req;
846
847 /* write a dummy byte to the pipe so fh becomes ready */
848 write (respipe [1], &respipe, 1);
849 }
850
851 pthread_mutex_unlock (&reslock);
852 }
853 while (type != REQ_QUIT);
854
855 return 0;
856}
857
858/*****************************************************************************/
859
860static void atfork_prepare (void)
861{
862 pthread_mutex_lock (&reqlock);
863 pthread_mutex_lock (&reslock);
864#if !HAVE_PREADWRITE
865 pthread_mutex_lock (&preadwritelock);
273#endif 866#endif
867#if !HAVE_READDIR_R
868 pthread_mutex_lock (&readdirlock);
869#endif
870}
274 871
275 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 872static void atfork_parent (void)
276 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 873{
277 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; 874#if !HAVE_READDIR_R
875 pthread_mutex_unlock (&readdirlock);
876#endif
877#if !HAVE_PREADWRITE
878 pthread_mutex_unlock (&preadwritelock);
879#endif
880 pthread_mutex_unlock (&reslock);
881 pthread_mutex_unlock (&reqlock);
882}
278 883
279 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; 884static void atfork_child (void)
280 case REQ_CLOSE: req->result = close (req->fd); break; 885{
281 case REQ_UNLINK: req->result = unlink (req->dataptr); break; 886 aio_req prv;
282 887
283 case REQ_FSYNC: req->result = fsync (req->fd); break; 888 started = 0;
284 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
285 889
286 case REQ_QUIT: 890 while (reqs)
287 write (respipe[1], (void *)&req, sizeof (req));
288 return 0;
289
290 default:
291 req->result = ENOSYS;
292 break;
293 }
294
295 req->errorno = errno;
296 write (respipe[1], (void *)&req, sizeof (req));
297 } 891 {
892 prv = reqs;
893 reqs = prv->next;
894 req_free (prv);
895 }
298 896
299 return 0; 897 reqs = reqe = 0;
300} 898
899 while (ress)
900 {
901 prv = ress;
902 ress = prv->next;
903 req_free (prv);
904 }
905
906 ress = rese = 0;
301 907
908 close (respipe [0]);
909 close (respipe [1]);
910 create_pipe ();
911
912 atfork_parent ();
913}
914
915#define dREQ \
916 aio_req req; \
917 \
918 if (SvOK (callback) && !SvROK (callback)) \
919 croak ("callback must be undef or of reference type"); \
920 \
921 Newz (0, req, 1, aio_cb); \
922 if (!req) \
923 croak ("out of memory during aio_req allocation"); \
924 \
925 req->callback = newSVsv (callback)
926
927#define REQ_SEND \
928 req_send (req); \
929 \
930 if (GIMME_V != G_VOID) \
931 XPUSHs (req_sv (req, AIO_REQ_KLASS));
932
302MODULE = IO::AIO PACKAGE = IO::AIO 933MODULE = IO::AIO PACKAGE = IO::AIO
303 934
935PROTOTYPES: ENABLE
936
304BOOT: 937BOOT:
305{ 938{
306 if (pipe (reqpipe) || pipe (respipe)) 939 HV *stash = gv_stashpv ("IO::AIO", 1);
307 croak ("unable to initialize request or result pipe"); 940 newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
941 newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
942 newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
308 943
309 if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK)) 944 create_pipe ();
310 croak ("cannot set result pipe to nonblocking mode"); 945 pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
311
312 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
313 croak ("cannot set result pipe to nonblocking mode");
314} 946}
315 947
316void 948void
317min_parallel(nthreads) 949min_parallel (nthreads)
318 int nthreads 950 int nthreads
319 PROTOTYPE: $ 951 PROTOTYPE: $
320 CODE:
321 while (nthreads > started)
322 start_thread ();
323 952
324void 953void
325max_parallel(nthreads) 954max_parallel (nthreads)
326 int nthreads 955 int nthreads
327 PROTOTYPE: $ 956 PROTOTYPE: $
957
958int
959max_outstanding (nreqs)
960 int nreqs
961 PROTOTYPE: $
328 CODE: 962 CODE:
329{ 963 RETVAL = max_outstanding;
330 int cur = started; 964 max_outstanding = nreqs;
331 while (cur > nthreads)
332 {
333 end_thread ();
334 cur--;
335 }
336 965
337 while (started > nthreads)
338 {
339 poll_wait ();
340 poll_cb (aTHX);
341 }
342}
343
344void 966void
345aio_open(pathname,flags,mode,callback) 967aio_open (pathname,flags,mode,callback=&PL_sv_undef)
346 SV * pathname 968 SV * pathname
347 int flags 969 int flags
348 int mode 970 int mode
349 SV * callback 971 SV * callback
350 PROTOTYPE: $$$$ 972 PROTOTYPE: $$$;$
351 CODE: 973 PPCODE:
352{ 974{
353 aio_req req; 975 dREQ;
354
355 Newz (0, req, 1, aio_cb);
356
357 if (!req)
358 croak ("out of memory during aio_req allocation");
359 976
360 req->type = REQ_OPEN; 977 req->type = REQ_OPEN;
361 req->data = newSVsv (pathname); 978 req->data = newSVsv (pathname);
362 req->dataptr = SvPV_nolen (req->data); 979 req->dataptr = SvPVbyte_nolen (req->data);
363 req->fd = flags; 980 req->fd = flags;
364 req->mode = mode; 981 req->mode = mode;
365 req->callback = SvREFCNT_inc (callback);
366 982
367 send_req (req); 983 REQ_SEND;
368} 984}
369 985
370void 986void
371aio_close(fh,callback) 987aio_close (fh,callback=&PL_sv_undef)
372 InputStream fh 988 SV * fh
373 SV * callback 989 SV * callback
374 PROTOTYPE: $$ 990 PROTOTYPE: $;$
375 ALIAS: 991 ALIAS:
376 aio_close = REQ_CLOSE 992 aio_close = REQ_CLOSE
377 aio_fsync = REQ_FSYNC 993 aio_fsync = REQ_FSYNC
378 aio_fdatasync = REQ_FDATASYNC 994 aio_fdatasync = REQ_FDATASYNC
379 CODE: 995 PPCODE:
996{
997 dREQ;
998
999 req->type = ix;
1000 req->fh = newSVsv (fh);
1001 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
1002
1003 REQ_SEND (req);
1004}
1005
1006void
1007aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
1008 SV * fh
1009 UV offset
1010 UV length
1011 SV * data
1012 UV dataoffset
1013 SV * callback
1014 ALIAS:
1015 aio_read = REQ_READ
1016 aio_write = REQ_WRITE
1017 PROTOTYPE: $$$$$;$
1018 PPCODE:
380{ 1019{
381 aio_req req; 1020 aio_req req;
1021 STRLEN svlen;
1022 char *svptr = SvPVbyte (data, svlen);
382 1023
383 Newz (0, req, 1, aio_cb); 1024 SvUPGRADE (data, SVt_PV);
1025 SvPOK_on (data);
384 1026
385 if (!req) 1027 if (dataoffset < 0)
386 croak ("out of memory during aio_req allocation"); 1028 dataoffset += svlen;
387 1029
388 req->type = ix; 1030 if (dataoffset < 0 || dataoffset > svlen)
389 req->fd = PerlIO_fileno (fh); 1031 croak ("data offset outside of string");
390 req->callback = SvREFCNT_inc (callback);
391 1032
392 send_req (req); 1033 if (ix == REQ_WRITE)
393} 1034 {
394 1035 /* write: check length and adjust. */
395void 1036 if (length < 0 || length + dataoffset > svlen)
396aio_read(fh,offset,length,data,dataoffset,callback) 1037 length = svlen - dataoffset;
397 InputStream fh 1038 }
398 UV offset 1039 else
399 IV length 1040 {
400 SV * data 1041 /* read: grow scalar as necessary */
401 IV dataoffset 1042 svptr = SvGROW (data, length + dataoffset);
402 SV * callback 1043 }
403 PROTOTYPE: $$$$$$
404 CODE:
405 read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
406
407void
408aio_write(fh,offset,length,data,dataoffset,callback)
409 OutputStream fh
410 UV offset
411 IV length
412 SV * data
413 IV dataoffset
414 SV * callback
415 PROTOTYPE: $$$$$$
416 CODE:
417 read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
418
419void
420aio_readahead(fh,offset,length,callback)
421 InputStream fh
422 UV offset
423 IV length
424 SV * callback
425 PROTOTYPE: $$$$
426 CODE:
427{
428 aio_req req;
429 1044
430 if (length < 0) 1045 if (length < 0)
431 croak ("length must not be negative"); 1046 croak ("length must not be negative");
432 1047
433 Newz (0, req, 1, aio_cb); 1048 {
1049 dREQ;
434 1050
435 if (!req) 1051 req->type = ix;
436 croak ("out of memory during aio_req allocation"); 1052 req->fh = newSVsv (fh);
1053 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
1054 : IoOFP (sv_2io (fh)));
1055 req->offset = offset;
1056 req->length = length;
1057 req->data = SvREFCNT_inc (data);
1058 req->dataptr = (char *)svptr + dataoffset;
1059
1060 if (!SvREADONLY (data))
1061 {
1062 SvREADONLY_on (data);
1063 req->data2ptr = (void *)data;
1064 }
1065
1066 REQ_SEND;
1067 }
1068}
1069
1070void
1071aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
1072 SV * out_fh
1073 SV * in_fh
1074 UV in_offset
1075 UV length
1076 SV * callback
1077 PROTOTYPE: $$$$;$
1078 PPCODE:
1079{
1080 dREQ;
1081
1082 req->type = REQ_SENDFILE;
1083 req->fh = newSVsv (out_fh);
1084 req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1085 req->fh2 = newSVsv (in_fh);
1086 req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1087 req->offset = in_offset;
1088 req->length = length;
1089
1090 REQ_SEND;
1091}
1092
1093void
1094aio_readahead (fh,offset,length,callback=&PL_sv_undef)
1095 SV * fh
1096 UV offset
1097 IV length
1098 SV * callback
1099 PROTOTYPE: $$$;$
1100 PPCODE:
1101{
1102 dREQ;
437 1103
438 req->type = REQ_READAHEAD; 1104 req->type = REQ_READAHEAD;
1105 req->fh = newSVsv (fh);
439 req->fd = PerlIO_fileno (fh); 1106 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
440 req->offset = offset; 1107 req->offset = offset;
441 req->length = length; 1108 req->length = length;
442 req->callback = SvREFCNT_inc (callback);
443 1109
444 send_req (req); 1110 REQ_SEND;
445} 1111}
446 1112
447void 1113void
448aio_stat(fh_or_path,callback) 1114aio_stat (fh_or_path,callback=&PL_sv_undef)
449 SV * fh_or_path 1115 SV * fh_or_path
450 SV * callback 1116 SV * callback
451 PROTOTYPE: $$
452 ALIAS: 1117 ALIAS:
1118 aio_stat = REQ_STAT
453 aio_lstat = 1 1119 aio_lstat = REQ_LSTAT
454 CODE: 1120 PPCODE:
455{ 1121{
456 aio_req req; 1122 dREQ;
457
458 Newz (0, req, 1, aio_cb);
459
460 if (!req)
461 croak ("out of memory during aio_req allocation");
462 1123
463 New (0, req->statdata, 1, Stat_t); 1124 New (0, req->statdata, 1, Stat_t);
464
465 if (!req->statdata) 1125 if (!req->statdata)
1126 {
1127 req_free (req);
466 croak ("out of memory during aio_req->statdata allocation"); 1128 croak ("out of memory during aio_req->statdata allocation");
1129 }
467 1130
468 if (SvPOK (fh_or_path)) 1131 if (SvPOK (fh_or_path))
469 { 1132 {
470 req->type = ix ? REQ_LSTAT : REQ_STAT; 1133 req->type = ix;
471 req->data = newSVsv (fh_or_path); 1134 req->data = newSVsv (fh_or_path);
472 req->dataptr = SvPV_nolen (req->data); 1135 req->dataptr = SvPVbyte_nolen (req->data);
473 } 1136 }
474 else 1137 else
475 { 1138 {
476 req->type = REQ_FSTAT; 1139 req->type = REQ_FSTAT;
1140 req->fh = newSVsv (fh_or_path);
477 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); 1141 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
478 } 1142 }
479 1143
480 req->callback = SvREFCNT_inc (callback); 1144 REQ_SEND;
481
482 send_req (req);
483} 1145}
484 1146
485void 1147void
486aio_unlink(pathname,callback) 1148aio_unlink (pathname,callback=&PL_sv_undef)
487 SV * pathname 1149 SV * pathname
488 SV * callback 1150 SV * callback
1151 ALIAS:
1152 aio_unlink = REQ_UNLINK
1153 aio_rmdir = REQ_RMDIR
1154 aio_readdir = REQ_READDIR
1155 PPCODE:
1156{
1157 dREQ;
1158
1159 req->type = ix;
1160 req->data = newSVsv (pathname);
1161 req->dataptr = SvPVbyte_nolen (req->data);
1162
1163 REQ_SEND;
1164}
1165
1166void
1167aio_link (oldpath,newpath,callback=&PL_sv_undef)
1168 SV * oldpath
1169 SV * newpath
1170 SV * callback
1171 ALIAS:
1172 aio_link = REQ_LINK
1173 aio_symlink = REQ_SYMLINK
1174 aio_rename = REQ_RENAME
1175 PPCODE:
1176{
1177 dREQ;
1178
1179 req->type = ix;
1180 req->fh = newSVsv (oldpath);
1181 req->data2ptr = SvPVbyte_nolen (req->fh);
1182 req->data = newSVsv (newpath);
1183 req->dataptr = SvPVbyte_nolen (req->data);
1184
1185 REQ_SEND;
1186}
1187
1188void
1189aio_sleep (delay,callback=&PL_sv_undef)
1190 double delay
1191 SV * callback
1192 PPCODE:
1193{
1194 dREQ;
1195
1196 req->type = REQ_SLEEP;
1197 req->fd = delay < 0. ? 0 : delay;
1198 req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
1199
1200 REQ_SEND;
1201}
1202
1203void
1204aio_group (callback=&PL_sv_undef)
1205 SV * callback
489 PROTOTYPE: $$ 1206 PROTOTYPE: ;$
1207 PPCODE:
1208{
1209 dREQ;
1210 req->type = REQ_GROUP;
1211 req_send (req);
1212 XPUSHs (req_sv (req, AIO_GRP_KLASS));
1213}
1214
1215void
1216flush ()
1217 PROTOTYPE:
490 CODE: 1218 CODE:
491{ 1219 while (nreqs)
492 aio_req req; 1220 {
493 1221 poll_wait ();
494 Newz (0, req, 1, aio_cb); 1222 poll_cb ();
495 1223 }
496 if (!req) 1224
497 croak ("out of memory during aio_req allocation"); 1225void
498 1226poll()
499 req->type = REQ_UNLINK; 1227 PROTOTYPE:
500 req->data = newSVsv (pathname); 1228 CODE:
501 req->dataptr = SvPV_nolen (req->data); 1229 if (nreqs)
502 req->callback = SvREFCNT_inc (callback); 1230 {
503 1231 poll_wait ();
504 send_req (req); 1232 poll_cb ();
505} 1233 }
506 1234
507int 1235int
508poll_fileno() 1236poll_fileno()
509 PROTOTYPE: 1237 PROTOTYPE:
510 CODE: 1238 CODE:
511 RETVAL = respipe[0]; 1239 RETVAL = respipe [0];
512 OUTPUT: 1240 OUTPUT:
513 RETVAL 1241 RETVAL
514 1242
515int 1243int
516poll_cb(...) 1244poll_cb(...)
517 PROTOTYPE: 1245 PROTOTYPE:
518 CODE: 1246 CODE:
519 RETVAL = poll_cb (aTHX); 1247 RETVAL = poll_cb ();
520 OUTPUT: 1248 OUTPUT:
521 RETVAL 1249 RETVAL
522 1250
523void 1251void
524poll_wait() 1252poll_wait()
525 PROTOTYPE: 1253 PROTOTYPE:
526 CODE: 1254 CODE:
1255 if (nreqs)
527 poll_wait (); 1256 poll_wait ();
528 1257
529int 1258int
530nreqs() 1259nreqs()
531 PROTOTYPE: 1260 PROTOTYPE:
532 CODE: 1261 CODE:
533 RETVAL = nreqs; 1262 RETVAL = nreqs;
534 OUTPUT: 1263 OUTPUT:
535 RETVAL 1264 RETVAL
536 1265
1266PROTOTYPES: DISABLE
1267
1268MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1269
1270void
1271cancel (aio_req_ornot req)
1272 PROTOTYPE:
1273 CODE:
1274 req_cancel (req);
1275
1276MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1277
1278void
1279add (aio_req grp, ...)
1280 PPCODE:
1281{
1282 int i;
1283
1284 if (grp->fd == 2)
1285 croak ("cannot add requests to IO::AIO::GRP after the group finished");
1286
1287 for (i = 1; i < items; ++i )
1288 {
1289 if (GIMME_V != G_VOID)
1290 XPUSHs (sv_2mortal (newSVsv (ST (i))));
1291
1292 aio_req req = SvAIO_REQ (ST (i));
1293
1294 if (req)
1295 {
1296 ++grp->length;
1297 req->grp = grp;
1298
1299 req->grp_prev = 0;
1300 req->grp_next = grp->grp_first;
1301
1302 if (grp->grp_first)
1303 grp->grp_first->grp_prev = req;
1304
1305 grp->grp_first = req;
1306 }
1307 }
1308}
1309
1310void
1311result (aio_req grp, ...)
1312 CODE:
1313{
1314 int i;
1315 AV *av = newAV ();
1316
1317 for (i = 1; i < items; ++i )
1318 av_push (av, newSVsv (ST (i)));
1319
1320 SvREFCNT_dec (grp->data);
1321 grp->data = (SV *)av;
1322}
1323
1324void
1325lock (aio_req grp)
1326 CODE:
1327 ++grp->length;
1328
1329void
1330unlock (aio_req grp)
1331 CODE:
1332 aio_grp_dec (grp);
1333
1334void
1335feeder_limit (aio_req grp, int limit)
1336 CODE:
1337 grp->fd2 = limit;
1338 aio_grp_feed (grp);
1339
1340void
1341set_feeder (aio_req grp, SV *callback=&PL_sv_undef)
1342 CODE:
1343{
1344 SvREFCNT_dec (grp->fh2);
1345 grp->fh2 = newSVsv (callback);
1346
1347 if (grp->fd2 <= 0)
1348 grp->fd2 = 2;
1349
1350 aio_grp_feed (grp);
1351}
1352

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