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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.44 by root, Sat Oct 21 23:20:29 2006 UTC vs.
Revision 1.77 by root, Thu Oct 26 13:25:40 2006 UTC

1/* solaris */
2#define _POSIX_PTHREAD_SEMANTICS 1
3
4#if __linux && !defined(_GNU_SOURCE)
5# define _GNU_SOURCE
6#endif
7
8/* just in case */
1#define _REENTRANT 1 9#define _REENTRANT 1
10
2#include <errno.h> 11#include <errno.h>
3 12
4#include "EXTERN.h" 13#include "EXTERN.h"
5#include "perl.h" 14#include "perl.h"
6#include "XSUB.h" 15#include "XSUB.h"
… …
9 18
10#include <pthread.h> 19#include <pthread.h>
11 20
12#include <stddef.h> 21#include <stddef.h>
13#include <errno.h> 22#include <errno.h>
23#include <sys/time.h>
24#include <sys/select.h>
14#include <sys/types.h> 25#include <sys/types.h>
15#include <sys/stat.h> 26#include <sys/stat.h>
16#include <limits.h> 27#include <limits.h>
17#include <unistd.h> 28#include <unistd.h>
18#include <fcntl.h> 29#include <fcntl.h>
… …
37/* used for struct dirent, AIX doesn't provide it */ 48/* used for struct dirent, AIX doesn't provide it */
38#ifndef NAME_MAX 49#ifndef NAME_MAX
39# define NAME_MAX 4096 50# define NAME_MAX 4096
40#endif 51#endif
41 52
53#ifndef PTHREAD_STACK_MIN
54/* care for broken platforms, e.g. windows */
55# define PTHREAD_STACK_MIN 16384
56#endif
57
42#if __ia64 58#if __ia64
43# define STACKSIZE 65536 59# define STACKSIZE 65536
60#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
61# define STACKSIZE PTHREAD_STACK_MIN
44#else 62#else
45# define STACKSIZE 8192 63# define STACKSIZE 16384
46#endif 64#endif
65
66/* buffer size for various temporary buffers */
67#define AIO_BUFSIZE 65536
68
69#define dBUF \
70 char *aio_buf; \
71 LOCK (wrklock); \
72 self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
73 UNLOCK (wrklock); \
74 if (!aio_buf) \
75 return -1;
47 76
48enum { 77enum {
49 REQ_QUIT, 78 REQ_QUIT,
50 REQ_OPEN, REQ_CLOSE, 79 REQ_OPEN, REQ_CLOSE,
51 REQ_READ, REQ_WRITE, REQ_READAHEAD, 80 REQ_READ, REQ_WRITE, REQ_READAHEAD,
… …
53 REQ_STAT, REQ_LSTAT, REQ_FSTAT, 82 REQ_STAT, REQ_LSTAT, REQ_FSTAT,
54 REQ_FSYNC, REQ_FDATASYNC, 83 REQ_FSYNC, REQ_FDATASYNC,
55 REQ_UNLINK, REQ_RMDIR, REQ_RENAME, 84 REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
56 REQ_READDIR, 85 REQ_READDIR,
57 REQ_LINK, REQ_SYMLINK, 86 REQ_LINK, REQ_SYMLINK,
58 REQ_GROUP, 87 REQ_GROUP, REQ_NOP,
88 REQ_BUSY,
59}; 89};
60 90
61#define AIO_REQ_KLASS "IO::AIO::REQ" 91#define AIO_REQ_KLASS "IO::AIO::REQ"
62#define AIO_GRP_KLASS "IO::AIO::GRP" 92#define AIO_GRP_KLASS "IO::AIO::GRP"
63 93
64typedef struct aio_cb 94typedef struct aio_cb
65{ 95{
66 struct aio_cb *grp, *grp_prev, *grp_next;
67
68 struct aio_cb *volatile next; 96 struct aio_cb *volatile next;
69
70 SV *self; /* the perl counterpart of this request, if any */
71 97
72 SV *data, *callback; 98 SV *data, *callback;
73 SV *fh, *fh2; 99 SV *fh, *fh2;
74 void *dataptr, *data2ptr; 100 void *dataptr, *data2ptr;
75 Stat_t *statdata; 101 Stat_t *statdata;
76 off_t offset; 102 off_t offset;
77 size_t length; 103 size_t length;
78 ssize_t result; 104 ssize_t result;
79 105
106 STRLEN dataoffset;
80 int type; 107 int type;
81 int fd, fd2; 108 int fd, fd2;
82 int errorno; 109 int errorno;
83 STRLEN dataoffset;
84 mode_t mode; /* open */ 110 mode_t mode; /* open */
111
85 unsigned char cancelled; 112 unsigned char flags;
113 unsigned char pri;
114
115 SV *self; /* the perl counterpart of this request, if any */
116 struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
86} aio_cb; 117} aio_cb;
118
119enum {
120 FLAG_CANCELLED = 0x01,
121};
87 122
88typedef aio_cb *aio_req; 123typedef aio_cb *aio_req;
89typedef aio_cb *aio_req_ornot; 124typedef aio_cb *aio_req_ornot;
90typedef aio_cb *aio_group; 125
126enum {
127 PRI_MIN = -4,
128 PRI_MAX = 4,
129
130 DEFAULT_PRI = 0,
131 PRI_BIAS = -PRI_MIN,
132 NUM_PRI = PRI_MAX + PRI_BIAS + 1,
133};
134
135static int next_pri = DEFAULT_PRI + PRI_BIAS;
91 136
92static int started, wanted; 137static int started, wanted;
93static volatile int nreqs; 138static volatile int nreqs;
94static int max_outstanding = 1<<30;
95static int respipe [2]; 139static int respipe [2];
96 140
141#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
142# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
143#else
144# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
145#endif
146
147#define LOCK(mutex) pthread_mutex_lock (&(mutex))
148#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
149
150/* worker threads management */
151static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
152
153typedef struct worker {
154 /* locked by wrklock */
155 struct worker *prev, *next;
156
157 pthread_t tid;
158
159 /* locked by reslock, reqlock or wrklock */
160 aio_req req; /* currently processed request */
161 void *dbuf;
162 DIR *dirp;
163} worker;
164
165static worker wrk_first = { &wrk_first, &wrk_first, 0 };
166
167static void worker_clear (worker *wrk)
168{
169 if (wrk->dirp)
170 {
171 closedir (wrk->dirp);
172 wrk->dirp = 0;
173 }
174
175 if (wrk->dbuf)
176 {
177 free (wrk->dbuf);
178 wrk->dbuf = 0;
179 }
180}
181
182static void worker_free (worker *wrk)
183{
184 wrk->next->prev = wrk->prev;
185 wrk->prev->next = wrk->next;
186
187 free (wrk);
188}
189
97static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; 190static pthread_mutex_t reslock = AIO_MUTEX_INIT;
98static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER; 191static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
99static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER; 192static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
100 193
101static volatile aio_req reqs, reqe; /* queue start, queue end */ 194/*
102static volatile aio_req ress, rese; /* queue start, queue end */ 195 * a somewhat faster data structure might be nice, but
196 * with 8 priorities this actually needs <20 insns
197 * per shift, the most expensive operation.
198 */
199typedef struct {
200 aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
201 int size;
202} reqq;
203
204static reqq req_queue;
205static reqq res_queue;
206
207int reqq_push (reqq *q, aio_req req)
208{
209 int pri = req->pri;
210 req->next = 0;
211
212 if (q->qe[pri])
213 {
214 q->qe[pri]->next = req;
215 q->qe[pri] = req;
216 }
217 else
218 q->qe[pri] = q->qs[pri] = req;
219
220 return q->size++;
221}
222
223aio_req reqq_shift (reqq *q)
224{
225 int pri;
226
227 if (!q->size)
228 return 0;
229
230 --q->size;
231
232 for (pri = NUM_PRI; pri--; )
233 {
234 aio_req req = q->qs[pri];
235
236 if (req)
237 {
238 if (!(q->qs[pri] = req->next))
239 q->qe[pri] = 0;
240
241 return req;
242 }
243 }
244
245 abort ();
246}
247
248static int poll_cb (int max);
249static void req_invoke (aio_req req);
250static void req_free (aio_req req);
251static void req_cancel (aio_req req);
103 252
104/* must be called at most once */ 253/* must be called at most once */
105static SV *req_sv (aio_req req, const char *klass) 254static SV *req_sv (aio_req req, const char *klass)
106{ 255{
256 if (!req->self)
257 {
107 req->self = (SV *)newHV (); 258 req->self = (SV *)newHV ();
108 sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0); 259 sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
260 }
109 261
110 return sv_2mortal (sv_bless (newRV_noinc (req->self), gv_stashpv (klass, 1))); 262 return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
111} 263}
112 264
113static aio_req SvAIO_REQ (SV *sv, const char *klass) 265static aio_req SvAIO_REQ (SV *sv)
114{ 266{
267 MAGIC *mg;
268
115 if (!sv_derived_from (sv, klass) || !SvROK (sv)) 269 if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
116 croak ("object of class %s expected", klass); 270 croak ("object of class " AIO_REQ_KLASS " expected");
117 271
118 MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext); 272 mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
119 273
120 return mg ? (aio_req)mg->mg_ptr : 0; 274 return mg ? (aio_req)mg->mg_ptr : 0;
275}
276
277static void aio_grp_feed (aio_req grp)
278{
279 while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
280 {
281 int old_len = grp->length;
282
283 if (grp->fh2 && SvOK (grp->fh2))
284 {
285 dSP;
286
287 ENTER;
288 SAVETMPS;
289 PUSHMARK (SP);
290 XPUSHs (req_sv (grp, AIO_GRP_KLASS));
291 PUTBACK;
292 call_sv (grp->fh2, G_VOID | G_EVAL | G_KEEPERR);
293 SPAGAIN;
294 FREETMPS;
295 LEAVE;
296 }
297
298 /* stop if no progress has been made */
299 if (old_len == grp->length)
300 {
301 SvREFCNT_dec (grp->fh2);
302 grp->fh2 = 0;
303 break;
304 }
305 }
306}
307
308static void aio_grp_dec (aio_req grp)
309{
310 --grp->length;
311
312 /* call feeder, if applicable */
313 aio_grp_feed (grp);
314
315 /* finish, if done */
316 if (!grp->length && grp->fd)
317 {
318 req_invoke (grp);
319 req_free (grp);
320 }
321}
322
323static void poll_wait ()
324{
325 fd_set rfd;
326
327 while (nreqs)
328 {
329 int size;
330#if !(__i386 || __x86_64) /* safe without sempahore on these archs */
331 LOCK (reslock);
332#endif
333 size = res_queue.size;
334#if !(__i386 || __x86_64) /* safe without sempahore on these archs */
335 UNLOCK (reslock);
336#endif
337
338 if (size)
339 return;
340
341 FD_ZERO(&rfd);
342 FD_SET(respipe [0], &rfd);
343
344 select (respipe [0] + 1, &rfd, 0, 0, 0);
345 }
346}
347
348static void req_invoke (aio_req req)
349{
350 dSP;
351
352 if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
353 {
354 errno = req->errorno;
355
356 ENTER;
357 SAVETMPS;
358 PUSHMARK (SP);
359 EXTEND (SP, 1);
360
361 switch (req->type)
362 {
363 case REQ_READDIR:
364 {
365 SV *rv = &PL_sv_undef;
366
367 if (req->result >= 0)
368 {
369 int i;
370 char *buf = req->data2ptr;
371 AV *av = newAV ();
372
373 av_extend (av, req->result - 1);
374
375 for (i = 0; i < req->result; ++i)
376 {
377 SV *sv = newSVpv (buf, 0);
378
379 av_store (av, i, sv);
380 buf += SvCUR (sv) + 1;
381 }
382
383 rv = sv_2mortal (newRV_noinc ((SV *)av));
384 }
385
386 PUSHs (rv);
387 }
388 break;
389
390 case REQ_OPEN:
391 {
392 /* convert fd to fh */
393 SV *fh;
394
395 PUSHs (sv_2mortal (newSViv (req->result)));
396 PUTBACK;
397 call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
398 SPAGAIN;
399
400 fh = SvREFCNT_inc (POPs);
401
402 PUSHMARK (SP);
403 XPUSHs (sv_2mortal (fh));
404 }
405 break;
406
407 case REQ_GROUP:
408 req->fd = 2; /* mark group as finished */
409
410 if (req->data)
411 {
412 int i;
413 AV *av = (AV *)req->data;
414
415 EXTEND (SP, AvFILL (av) + 1);
416 for (i = 0; i <= AvFILL (av); ++i)
417 PUSHs (*av_fetch (av, i, 0));
418 }
419 break;
420
421 case REQ_NOP:
422 case REQ_BUSY:
423 break;
424
425 default:
426 PUSHs (sv_2mortal (newSViv (req->result)));
427 break;
428 }
429
430
431 PUTBACK;
432 call_sv (req->callback, G_VOID | G_EVAL);
433 SPAGAIN;
434
435 FREETMPS;
436 LEAVE;
437 }
438
439 if (req->grp)
440 {
441 aio_req grp = req->grp;
442
443 /* unlink request */
444 if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
445 if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
446
447 if (grp->grp_first == req)
448 grp->grp_first = req->grp_next;
449
450 aio_grp_dec (grp);
451 }
452
453 if (SvTRUE (ERRSV))
454 {
455 req_free (req);
456 croak (0);
457 }
121} 458}
122 459
123static void req_free (aio_req req) 460static void req_free (aio_req req)
124{ 461{
125 if (req->self) 462 if (req->self)
126 { 463 {
127 sv_unmagic (req->self, PERL_MAGIC_ext); 464 sv_unmagic (req->self, PERL_MAGIC_ext);
128 SvREFCNT_dec (req->self); 465 SvREFCNT_dec (req->self);
129 } 466 }
130 467
131 if (req->data)
132 SvREFCNT_dec (req->data); 468 SvREFCNT_dec (req->data);
133
134 if (req->fh)
135 SvREFCNT_dec (req->fh); 469 SvREFCNT_dec (req->fh);
136
137 if (req->fh2)
138 SvREFCNT_dec (req->fh2); 470 SvREFCNT_dec (req->fh2);
139
140 if (req->statdata)
141 Safefree (req->statdata);
142
143 if (req->callback)
144 SvREFCNT_dec (req->callback); 471 SvREFCNT_dec (req->callback);
472 Safefree (req->statdata);
145 473
146 if (req->type == REQ_READDIR && req->result >= 0) 474 if (req->type == REQ_READDIR)
147 free (req->data2ptr); 475 free (req->data2ptr);
148 476
149 Safefree (req); 477 Safefree (req);
150} 478}
151 479
152static void 480static void req_cancel_subs (aio_req grp)
153poll_wait ()
154{ 481{
155 if (nreqs && !ress) 482 aio_req sub;
156 {
157 fd_set rfd;
158 FD_ZERO(&rfd);
159 FD_SET(respipe [0], &rfd);
160 483
161 select (respipe [0] + 1, &rfd, 0, 0, 0); 484 if (grp->type != REQ_GROUP)
162 } 485 return;
163}
164 486
165static int 487 SvREFCNT_dec (grp->fh2);
166poll_cb () 488 grp->fh2 = 0;
489
490 for (sub = grp->grp_first; sub; sub = sub->grp_next)
491 req_cancel (sub);
492}
493
494static void req_cancel (aio_req req)
495{
496 req->flags |= FLAG_CANCELLED;
497
498 req_cancel_subs (req);
499}
500
501static int poll_cb (int max)
167{ 502{
168 dSP; 503 dSP;
169 int count = 0; 504 int count = 0;
170 int do_croak = 0; 505 int do_croak = 0;
171 aio_req req; 506 aio_req req;
172 507
173 for (;;) 508 while (max <= 0 || count < max)
174 { 509 {
175 pthread_mutex_lock (&reslock); 510 LOCK (reslock);
176 req = ress; 511 req = reqq_shift (&res_queue);
177 512
178 if (req) 513 if (req)
179 { 514 {
180 ress = req->next;
181
182 if (!ress) 515 if (!res_queue.size)
183 { 516 {
184 /* read any signals sent by the worker threads */ 517 /* read any signals sent by the worker threads */
185 char buf [32]; 518 char buf [32];
186 while (read (respipe [0], buf, 32) == 32) 519 while (read (respipe [0], buf, 32) == 32)
187 ; 520 ;
188
189 rese = 0;
190 } 521 }
191 } 522 }
192 523
193 pthread_mutex_unlock (&reslock); 524 UNLOCK (reslock);
194 525
195 if (!req) 526 if (!req)
196 break; 527 break;
197 528
198 nreqs--; 529 --nreqs;
199 530
200 if (req->type == REQ_QUIT) 531 if (req->type == REQ_QUIT)
201 started--; 532 started--;
533 else if (req->type == REQ_GROUP && req->length)
534 {
535 req->fd = 1; /* mark request as delayed */
536 continue;
537 }
202 else 538 else
203 { 539 {
204 int errorno = errno;
205 errno = req->errorno;
206
207 if (req->type == REQ_READ) 540 if (req->type == REQ_READ)
208 SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0)); 541 SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
209 542
210 if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE)) 543 if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
211 SvREADONLY_off (req->data); 544 SvREADONLY_off (req->data);
… …
215 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; 548 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
216 PL_laststatval = req->result; 549 PL_laststatval = req->result;
217 PL_statcache = *(req->statdata); 550 PL_statcache = *(req->statdata);
218 } 551 }
219 552
220 ENTER; 553 req_invoke (req);
221 PUSHMARK (SP);
222 554
223 if (req->type == REQ_READDIR)
224 {
225 SV *rv = &PL_sv_undef;
226
227 if (req->result >= 0)
228 {
229 char *buf = req->data2ptr;
230 AV *av = newAV ();
231
232 while (req->result)
233 {
234 SV *sv = newSVpv (buf, 0);
235
236 av_push (av, sv);
237 buf += SvCUR (sv) + 1;
238 req->result--;
239 }
240
241 rv = sv_2mortal (newRV_noinc ((SV *)av));
242 }
243
244 XPUSHs (rv);
245 }
246 else
247 {
248 XPUSHs (sv_2mortal (newSViv (req->result)));
249
250 if (req->type == REQ_OPEN)
251 {
252 /* convert fd to fh */
253 SV *fh;
254
255 PUTBACK;
256 call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
257 SPAGAIN;
258
259 fh = SvREFCNT_inc (POPs);
260
261 PUSHMARK (SP);
262 XPUSHs (sv_2mortal (fh));
263 }
264 }
265
266 if (SvOK (req->callback) && !req->cancelled)
267 {
268 PUTBACK;
269 call_sv (req->callback, G_VOID | G_EVAL);
270 SPAGAIN;
271
272 if (SvTRUE (ERRSV))
273 {
274 req_free (req);
275 croak (0);
276 }
277 }
278
279 LEAVE;
280
281 errno = errorno;
282 count++; 555 count++;
283 } 556 }
284 557
285 req_free (req); 558 req_free (req);
286 } 559 }
… …
288 return count; 561 return count;
289} 562}
290 563
291static void *aio_proc(void *arg); 564static void *aio_proc(void *arg);
292 565
293static void
294start_thread (void) 566static void start_thread (void)
295{ 567{
296 sigset_t fullsigset, oldsigset; 568 sigset_t fullsigset, oldsigset;
297 pthread_t tid;
298 pthread_attr_t attr; 569 pthread_attr_t attr;
570
571 worker *wrk = calloc (1, sizeof (worker));
572
573 if (!wrk)
574 croak ("unable to allocate worker thread data");
299 575
300 pthread_attr_init (&attr); 576 pthread_attr_init (&attr);
301 pthread_attr_setstacksize (&attr, STACKSIZE); 577 pthread_attr_setstacksize (&attr, STACKSIZE);
302 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); 578 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
303 579
304 sigfillset (&fullsigset); 580 sigfillset (&fullsigset);
581
582 LOCK (wrklock);
305 sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); 583 sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
306 584
307 if (pthread_create (&tid, &attr, aio_proc, 0) == 0) 585 if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
586 {
587 wrk->prev = &wrk_first;
588 wrk->next = wrk_first.next;
589 wrk_first.next->prev = wrk;
590 wrk_first.next = wrk;
308 started++; 591 started++;
592 }
593 else
594 free (wrk);
309 595
310 sigprocmask (SIG_SETMASK, &oldsigset, 0); 596 sigprocmask (SIG_SETMASK, &oldsigset, 0);
597 UNLOCK (wrklock);
311} 598}
312 599
313static void
314req_send (aio_req req) 600static void req_send (aio_req req)
315{ 601{
316 while (started < wanted && nreqs >= started) 602 while (started < wanted && nreqs >= started)
317 start_thread (); 603 start_thread ();
318 604
319 nreqs++; 605 ++nreqs;
320 606
321 pthread_mutex_lock (&reqlock); 607 LOCK (reqlock);
322 608 reqq_push (&req_queue, req);
323 req->next = 0;
324
325 if (reqe)
326 {
327 reqe->next = req;
328 reqe = req;
329 }
330 else
331 reqe = reqs = req;
332
333 pthread_cond_signal (&reqwait); 609 pthread_cond_signal (&reqwait);
334 pthread_mutex_unlock (&reqlock); 610 UNLOCK (reqlock);
335
336 if (nreqs > max_outstanding)
337 for (;;)
338 {
339 poll_cb ();
340
341 if (nreqs <= max_outstanding)
342 break;
343
344 poll_wait ();
345 }
346} 611}
347 612
348static void 613static void end_thread (void)
349end_thread (void)
350{ 614{
351 aio_req req; 615 aio_req req;
616
352 Newz (0, req, 1, aio_cb); 617 Newz (0, req, 1, aio_cb);
618
353 req->type = REQ_QUIT; 619 req->type = REQ_QUIT;
620 req->pri = PRI_MAX + PRI_BIAS;
354 621
355 req_send (req); 622 req_send (req);
356} 623}
357 624
358static void min_parallel (int nthreads) 625static void min_parallel (int nthreads)
… …
375 } 642 }
376 643
377 while (started > wanted) 644 while (started > wanted)
378 { 645 {
379 poll_wait (); 646 poll_wait ();
380 poll_cb (); 647 poll_cb (0);
381 } 648 }
382} 649}
383 650
384static void create_pipe () 651static void create_pipe ()
385{ 652{
… …
405 * normal read/write by using a mutex. slows down execution a lot, 672 * normal read/write by using a mutex. slows down execution a lot,
406 * but that's your problem, not mine. 673 * but that's your problem, not mine.
407 */ 674 */
408static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER; 675static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
409 676
410static ssize_t 677static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
411pread (int fd, void *buf, size_t count, off_t offset)
412{ 678{
413 ssize_t res; 679 ssize_t res;
414 off_t ooffset; 680 off_t ooffset;
415 681
416 pthread_mutex_lock (&preadwritelock); 682 LOCK (preadwritelock);
417 ooffset = lseek (fd, 0, SEEK_CUR); 683 ooffset = lseek (fd, 0, SEEK_CUR);
418 lseek (fd, offset, SEEK_SET); 684 lseek (fd, offset, SEEK_SET);
419 res = read (fd, buf, count); 685 res = read (fd, buf, count);
420 lseek (fd, ooffset, SEEK_SET); 686 lseek (fd, ooffset, SEEK_SET);
421 pthread_mutex_unlock (&preadwritelock); 687 UNLOCK (preadwritelock);
422 688
423 return res; 689 return res;
424} 690}
425 691
426static ssize_t
427pwrite (int fd, void *buf, size_t count, off_t offset) 692static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
428{ 693{
429 ssize_t res; 694 ssize_t res;
430 off_t ooffset; 695 off_t ooffset;
431 696
432 pthread_mutex_lock (&preadwritelock); 697 LOCK (preadwritelock);
433 ooffset = lseek (fd, 0, SEEK_CUR); 698 ooffset = lseek (fd, 0, SEEK_CUR);
434 lseek (fd, offset, SEEK_SET); 699 lseek (fd, offset, SEEK_SET);
435 res = write (fd, buf, count); 700 res = write (fd, buf, count);
436 lseek (fd, offset, SEEK_SET); 701 lseek (fd, offset, SEEK_SET);
437 pthread_mutex_unlock (&preadwritelock); 702 UNLOCK (preadwritelock);
438 703
439 return res; 704 return res;
440} 705}
441#endif 706#endif
442 707
443#if !HAVE_FDATASYNC 708#if !HAVE_FDATASYNC
444# define fdatasync fsync 709# define fdatasync fsync
445#endif 710#endif
446 711
447#if !HAVE_READAHEAD 712#if !HAVE_READAHEAD
448# define readahead aio_readahead 713# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
449 714
450static ssize_t 715static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
451readahead (int fd, off_t offset, size_t count)
452{ 716{
453 char readahead_buf[4096]; 717 dBUF;
454 718
455 while (count > 0) 719 while (count > 0)
456 { 720 {
457 size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); 721 size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
458 722
459 pread (fd, readahead_buf, len, offset); 723 pread (fd, aio_buf, len, offset);
460 offset += len; 724 offset += len;
461 count -= len; 725 count -= len;
462 } 726 }
463 727
464 errno = 0; 728 errno = 0;
465} 729}
730
466#endif 731#endif
467 732
468#if !HAVE_READDIR_R 733#if !HAVE_READDIR_R
469# define readdir_r aio_readdir_r 734# define readdir_r aio_readdir_r
470 735
471static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER; 736static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
472 737
473static int
474readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res) 738static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
475{ 739{
476 struct dirent *e; 740 struct dirent *e;
477 int errorno; 741 int errorno;
478 742
479 pthread_mutex_lock (&readdirlock); 743 LOCK (readdirlock);
480 744
481 e = readdir (dirp); 745 e = readdir (dirp);
482 errorno = errno; 746 errorno = errno;
483 747
484 if (e) 748 if (e)
… …
487 strcpy (ent->d_name, e->d_name); 751 strcpy (ent->d_name, e->d_name);
488 } 752 }
489 else 753 else
490 *res = 0; 754 *res = 0;
491 755
492 pthread_mutex_unlock (&readdirlock); 756 UNLOCK (readdirlock);
493 757
494 errno = errorno; 758 errno = errorno;
495 return e ? 0 : -1; 759 return e ? 0 : -1;
496} 760}
497#endif 761#endif
498 762
499/* sendfile always needs emulation */ 763/* sendfile always needs emulation */
500static ssize_t
501sendfile_ (int ofd, int ifd, off_t offset, size_t count) 764static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
502{ 765{
503 ssize_t res; 766 ssize_t res;
504 767
505 if (!count) 768 if (!count)
506 return 0; 769 return 0;
… …
517 { 780 {
518 off_t sbytes; 781 off_t sbytes;
519 res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0); 782 res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
520 783
521 if (res < 0 && sbytes) 784 if (res < 0 && sbytes)
522 /* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */ 785 /* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
523 res = sbytes; 786 res = sbytes;
524 } 787 }
525 788
526# elif __hpux 789# elif __hpux
527 res = sendfile (ofd, ifd, offset, count, 0, 0); 790 res = sendfile (ofd, ifd, offset, count, 0, 0);
… …
555#endif 818#endif
556 ) 819 )
557 ) 820 )
558 { 821 {
559 /* emulate sendfile. this is a major pain in the ass */ 822 /* emulate sendfile. this is a major pain in the ass */
560 char buf[4096]; 823 dBUF;
824
561 res = 0; 825 res = 0;
562 826
563 while (count) 827 while (count)
564 { 828 {
565 ssize_t cnt; 829 ssize_t cnt;
566 830
567 cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset); 831 cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
568 832
569 if (cnt <= 0) 833 if (cnt <= 0)
570 { 834 {
571 if (cnt && !res) res = -1; 835 if (cnt && !res) res = -1;
572 break; 836 break;
573 } 837 }
574 838
575 cnt = write (ofd, buf, cnt); 839 cnt = write (ofd, aio_buf, cnt);
576 840
577 if (cnt <= 0) 841 if (cnt <= 0)
578 { 842 {
579 if (cnt && !res) res = -1; 843 if (cnt && !res) res = -1;
580 break; 844 break;
… …
588 852
589 return res; 853 return res;
590} 854}
591 855
592/* read a full directory */ 856/* read a full directory */
593static int 857static void scandir_ (aio_req req, worker *self)
594scandir_ (const char *path, void **namesp)
595{ 858{
596 DIR *dirp = opendir (path); 859 DIR *dirp;
597 union 860 union
598 { 861 {
599 struct dirent d; 862 struct dirent d;
600 char b [offsetof (struct dirent, d_name) + NAME_MAX + 1]; 863 char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
601 } u; 864 } *u;
602 struct dirent *entp; 865 struct dirent *entp;
603 char *name, *names; 866 char *name, *names;
604 int memlen = 4096; 867 int memlen = 4096;
605 int memofs = 0; 868 int memofs = 0;
606 int res = 0; 869 int res = 0;
607 int errorno; 870 int errorno;
608 871
609 if (!dirp) 872 LOCK (wrklock);
610 return -1; 873 self->dirp = dirp = opendir (req->dataptr);
611 874 self->dbuf = u = malloc (sizeof (*u));
612 names = malloc (memlen); 875 req->data2ptr = names = malloc (memlen);
876 UNLOCK (wrklock);
613 877
878 if (dirp && u && names)
614 for (;;) 879 for (;;)
615 { 880 {
881 errno = 0;
616 errno = 0, readdir_r (dirp, &u.d, &entp); 882 readdir_r (dirp, &u->d, &entp);
617 883
618 if (!entp) 884 if (!entp)
619 break; 885 break;
620 886
621 name = entp->d_name; 887 name = entp->d_name;
622 888
623 if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2]))) 889 if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
624 { 890 {
625 int len = strlen (name) + 1; 891 int len = strlen (name) + 1;
626 892
627 res++; 893 res++;
628 894
629 while (memofs + len > memlen) 895 while (memofs + len > memlen)
630 { 896 {
631 memlen *= 2; 897 memlen *= 2;
898 LOCK (wrklock);
632 names = realloc (names, memlen); 899 req->data2ptr = names = realloc (names, memlen);
900 UNLOCK (wrklock);
901
633 if (!names) 902 if (!names)
634 break; 903 break;
635 } 904 }
636 905
637 memcpy (names + memofs, name, len); 906 memcpy (names + memofs, name, len);
638 memofs += len; 907 memofs += len;
639 } 908 }
640 } 909 }
641 910
642 errorno = errno;
643 closedir (dirp);
644
645 if (errorno) 911 if (errno)
646 {
647 free (names);
648 errno = errorno;
649 res = -1; 912 res = -1;
650 } 913
651 914 req->result = res;
652 *namesp = (void *)names;
653 return res;
654} 915}
655 916
656/*****************************************************************************/ 917/*****************************************************************************/
657 918
658static void *
659aio_proc (void *thr_arg) 919static void *aio_proc (void *thr_arg)
660{ 920{
661 aio_req req; 921 aio_req req;
662 int type; 922 int type;
923 worker *self = (worker *)thr_arg;
663 924
664 do 925 do
665 { 926 {
666 pthread_mutex_lock (&reqlock); 927 LOCK (reqlock);
667 928
668 for (;;) 929 for (;;)
669 { 930 {
670 req = reqs; 931 self->req = req = reqq_shift (&req_queue);
671
672 if (reqs)
673 {
674 reqs = reqs->next;
675 if (!reqs) reqe = 0;
676 }
677 932
678 if (req) 933 if (req)
679 break; 934 break;
680 935
681 pthread_cond_wait (&reqwait, &reqlock); 936 pthread_cond_wait (&reqwait, &reqlock);
682 } 937 }
683 938
684 pthread_mutex_unlock (&reqlock); 939 UNLOCK (reqlock);
685 940
686 errno = 0; /* strictly unnecessary */ 941 errno = 0; /* strictly unnecessary */
942 type = req->type; /* remember type for QUIT check */
687 943
688 if (!req->cancelled) 944 if (!(req->flags & FLAG_CANCELLED))
689 switch (req->type) 945 switch (type)
690 { 946 {
691 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; 947 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
692 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; 948 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
693 949
694 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 950 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
695 case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break; 951 case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length, self); break;
696 952
697 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 953 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
698 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 954 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
699 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; 955 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
700 956
… …
706 case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break; 962 case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
707 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break; 963 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
708 964
709 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; 965 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
710 case REQ_FSYNC: req->result = fsync (req->fd); break; 966 case REQ_FSYNC: req->result = fsync (req->fd); break;
711 case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break; 967 case REQ_READDIR: scandir_ (req, self); break;
712 968
969 case REQ_BUSY:
970 {
971 struct timeval tv;
972
973 tv.tv_sec = req->fd;
974 tv.tv_usec = req->fd2;
975
976 req->result = select (0, 0, 0, 0, &tv);
977 }
978
979 case REQ_GROUP:
980 case REQ_NOP:
713 case REQ_QUIT: 981 case REQ_QUIT:
714 break; 982 break;
715 983
716 default: 984 default:
717 req->result = ENOSYS; 985 req->result = ENOSYS;
718 break; 986 break;
719 } 987 }
720 988
721 req->errorno = errno; 989 req->errorno = errno;
722 990
723 pthread_mutex_lock (&reslock); 991 LOCK (reslock);
724 992
725 req->next = 0; 993 if (!reqq_push (&res_queue, req))
726
727 if (rese)
728 {
729 rese->next = req;
730 rese = req;
731 }
732 else
733 {
734 rese = ress = req;
735
736 /* write a dummy byte to the pipe so fh becomes ready */ 994 /* write a dummy byte to the pipe so fh becomes ready */
737 write (respipe [1], &respipe, 1); 995 write (respipe [1], &respipe, 1);
738 }
739 996
740 pthread_mutex_unlock (&reslock); 997 self->req = 0;
998 worker_clear (self);
999
1000 UNLOCK (reslock);
741 } 1001 }
742 while (type != REQ_QUIT); 1002 while (type != REQ_QUIT);
743 1003
1004 LOCK (wrklock);
1005 worker_free (self);
1006 UNLOCK (wrklock);
1007
744 return 0; 1008 return 0;
745} 1009}
746 1010
747/*****************************************************************************/ 1011/*****************************************************************************/
748 1012
749static void atfork_prepare (void) 1013static void atfork_prepare (void)
750{ 1014{
751 pthread_mutex_lock (&reqlock); 1015 LOCK (wrklock);
752 pthread_mutex_lock (&reslock); 1016 LOCK (reqlock);
1017 LOCK (reslock);
753#if !HAVE_PREADWRITE 1018#if !HAVE_PREADWRITE
754 pthread_mutex_lock (&preadwritelock); 1019 LOCK (preadwritelock);
755#endif 1020#endif
756#if !HAVE_READDIR_R 1021#if !HAVE_READDIR_R
757 pthread_mutex_lock (&readdirlock); 1022 LOCK (readdirlock);
758#endif 1023#endif
759} 1024}
760 1025
761static void atfork_parent (void) 1026static void atfork_parent (void)
762{ 1027{
763#if !HAVE_READDIR_R 1028#if !HAVE_READDIR_R
764 pthread_mutex_unlock (&readdirlock); 1029 UNLOCK (readdirlock);
765#endif 1030#endif
766#if !HAVE_PREADWRITE 1031#if !HAVE_PREADWRITE
767 pthread_mutex_unlock (&preadwritelock); 1032 UNLOCK (preadwritelock);
768#endif 1033#endif
769 pthread_mutex_unlock (&reslock); 1034 UNLOCK (reslock);
770 pthread_mutex_unlock (&reqlock); 1035 UNLOCK (reqlock);
1036 UNLOCK (wrklock);
771} 1037}
772 1038
773static void atfork_child (void) 1039static void atfork_child (void)
774{ 1040{
775 aio_req prv; 1041 aio_req prv;
776 1042
1043 while (prv = reqq_shift (&req_queue))
1044 req_free (prv);
1045
1046 while (prv = reqq_shift (&res_queue))
1047 req_free (prv);
1048
1049 while (wrk_first.next != &wrk_first)
1050 {
1051 worker *wrk = wrk_first.next;
1052
1053 if (wrk->req)
1054 req_free (wrk->req);
1055
1056 worker_clear (wrk);
1057 worker_free (wrk);
1058 }
1059
777 started = 0; 1060 started = 0;
778 1061 nreqs = 0;
779 while (reqs)
780 {
781 prv = reqs;
782 reqs = prv->next;
783 req_free (prv);
784 }
785
786 reqs = reqe = 0;
787
788 while (ress)
789 {
790 prv = ress;
791 ress = prv->next;
792 req_free (prv);
793 }
794
795 ress = rese = 0;
796 1062
797 close (respipe [0]); 1063 close (respipe [0]);
798 close (respipe [1]); 1064 close (respipe [1]);
799 create_pipe (); 1065 create_pipe ();
800 1066
801 atfork_parent (); 1067 atfork_parent ();
802} 1068}
803 1069
804#define dREQ \ 1070#define dREQ \
805 aio_req req; \ 1071 aio_req req; \
1072 int req_pri = next_pri; \
1073 next_pri = DEFAULT_PRI + PRI_BIAS; \
806 \ 1074 \
807 if (SvOK (callback) && !SvROK (callback)) \ 1075 if (SvOK (callback) && !SvROK (callback)) \
808 croak ("callback must be undef or of reference type"); \ 1076 croak ("callback must be undef or of reference type"); \
809 \ 1077 \
810 Newz (0, req, 1, aio_cb); \ 1078 Newz (0, req, 1, aio_cb); \
811 if (!req) \ 1079 if (!req) \
812 croak ("out of memory during aio_req allocation"); \ 1080 croak ("out of memory during aio_req allocation"); \
813 \ 1081 \
814 req->callback = newSVsv (callback) 1082 req->callback = newSVsv (callback); \
1083 req->pri = req_pri
815 1084
816#define REQ_SEND \ 1085#define REQ_SEND \
817 req_send (req); \ 1086 req_send (req); \
818 \ 1087 \
819 if (GIMME_V != G_VOID) \ 1088 if (GIMME_V != G_VOID) \
… …
841 1110
842void 1111void
843max_parallel (nthreads) 1112max_parallel (nthreads)
844 int nthreads 1113 int nthreads
845 PROTOTYPE: $ 1114 PROTOTYPE: $
846
847int
848max_outstanding (nreqs)
849 int nreqs
850 PROTOTYPE: $
851 CODE:
852 RETVAL = max_outstanding;
853 max_outstanding = nreqs;
854 1115
855void 1116void
856aio_open (pathname,flags,mode,callback=&PL_sv_undef) 1117aio_open (pathname,flags,mode,callback=&PL_sv_undef)
857 SV * pathname 1118 SV * pathname
858 int flags 1119 int flags
… …
1073 1334
1074 REQ_SEND; 1335 REQ_SEND;
1075} 1336}
1076 1337
1077void 1338void
1339aio_busy (delay,callback=&PL_sv_undef)
1340 double delay
1341 SV * callback
1342 PPCODE:
1343{
1344 dREQ;
1345
1346 req->type = REQ_BUSY;
1347 req->fd = delay < 0. ? 0 : delay;
1348 req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
1349
1350 REQ_SEND;
1351}
1352
1353void
1078aio_group (callback=&PL_sv_undef) 1354aio_group (callback=&PL_sv_undef)
1079 SV * callback 1355 SV * callback
1080 PROTOTYPE: ;& 1356 PROTOTYPE: ;$
1081 PPCODE: 1357 PPCODE:
1082{ 1358{
1083 dREQ; 1359 dREQ;
1360
1084 req->type = REQ_GROUP; 1361 req->type = REQ_GROUP;
1362 req_send (req);
1363
1085 XPUSHs (req_sv (req, AIO_GRP_KLASS)); 1364 XPUSHs (req_sv (req, AIO_GRP_KLASS));
1086} 1365}
1366
1367void
1368aio_nop (callback=&PL_sv_undef)
1369 SV * callback
1370 PPCODE:
1371{
1372 dREQ;
1373
1374 req->type = REQ_NOP;
1375
1376 REQ_SEND;
1377}
1378
1379void
1380aioreq_pri (int pri = DEFAULT_PRI)
1381 CODE:
1382 if (pri < PRI_MIN) pri = PRI_MIN;
1383 if (pri > PRI_MAX) pri = PRI_MAX;
1384 next_pri = pri + PRI_BIAS;
1385
1386void
1387aioreq_nice (int nice = 0)
1388 CODE:
1389 nice = next_pri - nice;
1390 if (nice < PRI_MIN) nice = PRI_MIN;
1391 if (nice > PRI_MAX) nice = PRI_MAX;
1392 next_pri = nice + PRI_BIAS;
1087 1393
1088void 1394void
1089flush () 1395flush ()
1090 PROTOTYPE: 1396 PROTOTYPE:
1091 CODE: 1397 CODE:
1092 while (nreqs) 1398 while (nreqs)
1093 { 1399 {
1094 poll_wait (); 1400 poll_wait ();
1095 poll_cb (); 1401 poll_cb (0);
1096 } 1402 }
1097 1403
1098void 1404void
1099poll() 1405poll()
1100 PROTOTYPE: 1406 PROTOTYPE:
1101 CODE: 1407 CODE:
1102 if (nreqs) 1408 if (nreqs)
1103 { 1409 {
1104 poll_wait (); 1410 poll_wait ();
1105 poll_cb (); 1411 poll_cb (0);
1106 } 1412 }
1107 1413
1108int 1414int
1109poll_fileno() 1415poll_fileno()
1110 PROTOTYPE: 1416 PROTOTYPE:
… …
1115 1421
1116int 1422int
1117poll_cb(...) 1423poll_cb(...)
1118 PROTOTYPE: 1424 PROTOTYPE:
1119 CODE: 1425 CODE:
1120 RETVAL = poll_cb (); 1426 RETVAL = poll_cb (0);
1427 OUTPUT:
1428 RETVAL
1429
1430int
1431poll_some(int max = 0)
1432 PROTOTYPE: $
1433 CODE:
1434 RETVAL = poll_cb (max);
1121 OUTPUT: 1435 OUTPUT:
1122 RETVAL 1436 RETVAL
1123 1437
1124void 1438void
1125poll_wait() 1439poll_wait()
… …
1134 CODE: 1448 CODE:
1135 RETVAL = nreqs; 1449 RETVAL = nreqs;
1136 OUTPUT: 1450 OUTPUT:
1137 RETVAL 1451 RETVAL
1138 1452
1453PROTOTYPES: DISABLE
1454
1139MODULE = IO::AIO PACKAGE = IO::AIO::REQ 1455MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1140 1456
1141void 1457void
1142cancel (aio_req_ornot req) 1458cancel (aio_req_ornot req)
1143 PROTOTYPE:
1144 CODE: 1459 CODE:
1145 req->cancelled = 1; 1460 req_cancel (req);
1146 1461
1462void
1463cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
1464 CODE:
1465 SvREFCNT_dec (req->callback);
1466 req->callback = newSVsv (callback);
1467
1468MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1469
1470void
1471add (aio_req grp, ...)
1472 PPCODE:
1473{
1474 int i;
1475 aio_req req;
1476
1477 if (grp->fd == 2)
1478 croak ("cannot add requests to IO::AIO::GRP after the group finished");
1479
1480 for (i = 1; i < items; ++i )
1481 {
1482 if (GIMME_V != G_VOID)
1483 XPUSHs (sv_2mortal (newSVsv (ST (i))));
1484
1485 req = SvAIO_REQ (ST (i));
1486
1487 if (req)
1488 {
1489 ++grp->length;
1490 req->grp = grp;
1491
1492 req->grp_prev = 0;
1493 req->grp_next = grp->grp_first;
1494
1495 if (grp->grp_first)
1496 grp->grp_first->grp_prev = req;
1497
1498 grp->grp_first = req;
1499 }
1500 }
1501}
1502
1503void
1504cancel_subs (aio_req_ornot req)
1505 CODE:
1506 req_cancel_subs (req);
1507
1508void
1509result (aio_req grp, ...)
1510 CODE:
1511{
1512 int i;
1513 AV *av = newAV ();
1514
1515 for (i = 1; i < items; ++i )
1516 av_push (av, newSVsv (ST (i)));
1517
1518 SvREFCNT_dec (grp->data);
1519 grp->data = (SV *)av;
1520}
1521
1522void
1523limit (aio_req grp, int limit)
1524 CODE:
1525 grp->fd2 = limit;
1526 aio_grp_feed (grp);
1527
1528void
1529feed (aio_req grp, SV *callback=&PL_sv_undef)
1530 CODE:
1531{
1532 SvREFCNT_dec (grp->fh2);
1533 grp->fh2 = newSVsv (callback);
1534
1535 if (grp->fd2 <= 0)
1536 grp->fd2 = 2;
1537
1538 aio_grp_feed (grp);
1539}
1540

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