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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.16 by root, Sun Jul 31 18:20:07 2005 UTC vs.
Revision 1.24 by root, Wed Aug 17 03:01:56 2005 UTC

1#define _REENTRANT 1
2#include <errno.h>
3
1#include "EXTERN.h" 4#include "EXTERN.h"
2#include "perl.h" 5#include "perl.h"
3#include "XSUB.h" 6#include "XSUB.h"
4 7
5#include "autoconf/config.h" 8#include "autoconf/config.h"
… …
26 29
27enum { 30enum {
28 REQ_QUIT, 31 REQ_QUIT,
29 REQ_OPEN, REQ_CLOSE, 32 REQ_OPEN, REQ_CLOSE,
30 REQ_READ, REQ_WRITE, REQ_READAHEAD, 33 REQ_READ, REQ_WRITE, REQ_READAHEAD,
31 REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK, 34 REQ_STAT, REQ_LSTAT, REQ_FSTAT,
32 REQ_FSYNC, REQ_FDATASYNC, 35 REQ_FSYNC, REQ_FDATASYNC,
36 REQ_UNLINK, REQ_RMDIR,
37 REQ_SYMLINK,
33}; 38};
34 39
35typedef struct aio_cb { 40typedef struct aio_cb {
36 struct aio_cb *volatile next; 41 struct aio_cb *volatile next;
37 42
… …
42 size_t length; 47 size_t length;
43 ssize_t result; 48 ssize_t result;
44 mode_t mode; /* open */ 49 mode_t mode; /* open */
45 int errorno; 50 int errorno;
46 SV *data, *callback, *fh; 51 SV *data, *callback, *fh;
47 void *dataptr; 52 void *dataptr, *data2ptr;
48 STRLEN dataoffset; 53 STRLEN dataoffset;
49 54
50 Stat_t *statdata; 55 Stat_t *statdata;
51} aio_cb; 56} aio_cb;
52 57
… …
57static int max_outstanding = 1<<30; 62static int max_outstanding = 1<<30;
58static int respipe [2]; 63static int respipe [2];
59 64
60static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; 65static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
61static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER; 66static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
67static pthread_mutex_t frklock = PTHREAD_MUTEX_INITIALIZER;
62static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER; 68static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
63 69
64static volatile aio_req reqs, reqe; /* queue start, queue end */ 70static volatile aio_req reqs, reqe; /* queue start, queue end */
65static volatile aio_req ress, rese; /* queue start, queue end */ 71static volatile aio_req ress, rese; /* queue start, queue end */
66 72
… …
80static int 86static int
81poll_cb () 87poll_cb ()
82{ 88{
83 dSP; 89 dSP;
84 int count = 0; 90 int count = 0;
91 int do_croak = 0;
85 aio_req req, prv; 92 aio_req req, prv;
86 93
87 pthread_mutex_lock (&reslock); 94 pthread_mutex_lock (&reslock);
88 95
89 { 96 {
90 /* read any signals sent by the worker threads */ 97 /* read any signals sent by the worker threads */
91 char buf [32]; 98 char buf [32];
92 while (read (respipe [0], buf, 32) > 0) 99 while (read (respipe [0], buf, 32) == 32)
93 ; 100 ;
94 } 101 }
95 102
96 req = ress; 103 req = ress;
97 ress = rese = 0; 104 ress = rese = 0;
… …
152 PUTBACK; 159 PUTBACK;
153 call_sv (req->callback, G_VOID | G_EVAL); 160 call_sv (req->callback, G_VOID | G_EVAL);
154 SPAGAIN; 161 SPAGAIN;
155 } 162 }
156 163
164 do_croak = SvTRUE (ERRSV);
165
157 LEAVE; 166 LEAVE;
158 167
159 if (req->callback) 168 if (req->callback)
160 SvREFCNT_dec (req->callback); 169 SvREFCNT_dec (req->callback);
161 170
… …
165 174
166 prv = req; 175 prv = req;
167 req = req->next; 176 req = req->next;
168 Safefree (prv); 177 Safefree (prv);
169 178
170 /* TODO: croak on errors? */ 179 if (do_croak)
180 croak (0);
171 } 181 }
172 182
173 return count; 183 return count;
174} 184}
175 185
… …
230 req->type = REQ_QUIT; 240 req->type = REQ_QUIT;
231 241
232 send_req (req); 242 send_req (req);
233} 243}
234 244
245
246static void min_parallel (int nthreads)
247{
248 while (nthreads > started)
249 start_thread ();
250}
251
252static void max_parallel (int nthreads)
253{
254 int cur = started;
255 while (cur > nthreads)
256 {
257 end_thread ();
258 cur--;
259 }
260
261 while (started > nthreads)
262 {
263 poll_wait ();
264 poll_cb ();
265 }
266}
267
268static int fork_started;
269
270static void atfork_prepare (void)
271{
272 pthread_mutex_lock (&frklock);
273
274 fork_started = started;
275
276 for (;;) {
277 while (nreqs)
278 {
279 poll_wait ();
280 poll_cb ();
281 }
282
283 max_parallel (0);
284
285 pthread_mutex_lock (&reqlock);
286
287 if (!nreqs && !started)
288 break;
289
290 pthread_mutex_unlock (&reqlock);
291
292 min_parallel (fork_started);
293 }
294
295 pthread_mutex_lock (&reslock);
296
297 assert (!started);
298 assert (!nreqs);
299 assert (!reqs && !reqe);
300 assert (!ress && !rese);
301}
302
303static void atfork_parent (void)
304{
305 pthread_mutex_unlock (&reslock);
306 min_parallel (fork_started);
307 pthread_mutex_unlock (&reqlock);
308 pthread_mutex_unlock (&frklock);
309}
310
311static void atfork_child (void)
312{
313 reqs = reqe = 0;
314
315 atfork_parent ();
316}
317
318/*****************************************************************************/
319/* work around various missing functions */
320
321#if !HAVE_PREADWRITE
322# define pread aio_pread
323# define pwrite aio_pwrite
324
325/*
326 * make our pread/pwrite safe against themselves, but not against
327 * normal read/write by using a mutex. slows down execution a lot,
328 * but that's your problem, not mine.
329 */
330static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
331
332static ssize_t
333pread (int fd, void *buf, size_t count, off_t offset)
334{
335 ssize_t res;
336 off_t ooffset;
337
338 pthread_mutex_lock (&iolock);
339 ooffset = lseek (fd, 0, SEEK_CUR);
340 lseek (fd, offset, SEEK_SET);
341 res = read (fd, buf, count);
342 lseek (fd, ooffset, SEEK_SET);
343 pthread_mutex_unlock (&iolock);
344
345 return res;
346}
347
348static ssize_t
349pwrite (int fd, void *buf, size_t count, off_t offset)
350{
351 ssize_t res;
352 off_t ooffset;
353
354 pthread_mutex_lock (&iolock);
355 ooffset = lseek (fd, 0, SEEK_CUR);
356 lseek (fd, offset, SEEK_SET);
357 res = write (fd, buf, count);
358 lseek (fd, offset, SEEK_SET);
359 pthread_mutex_unlock (&iolock);
360
361 return res;
362}
363#endif
364
365#if !HAVE_FDATASYNC
366# define fdatasync fsync
367#endif
368
369#if !HAVE_READAHEAD
370# define readahead aio_readahead
371
372static char readahead_buf[4096];
373
374static ssize_t
375readahead (int fd, off_t offset, size_t count)
376{
377 while (count > 0)
378 {
379 size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
380
381 pread (fd, readahead_buf, len, offset);
382 offset += len;
383 count -= len;
384 }
385
386 errno = 0;
387}
388#endif
389
390/*****************************************************************************/
391
235static void * 392static void *
236aio_proc (void *thr_arg) 393aio_proc (void *thr_arg)
237{ 394{
238 aio_req req; 395 aio_req req;
239 int type; 396 int type;
… …
264 421
265 type = req->type; 422 type = req->type;
266 423
267 switch (type) 424 switch (type)
268 { 425 {
269#if HAVE_PREADWRITE
270 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; 426 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
271 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; 427 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
272#else
273# error "pread/pwrite cannot be emulated, fix your os"
274#endif
275 428
276#if HAVE_READAHEAD
277 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 429 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
278#else
279 // TODO: emulate
280 case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
281#endif
282 430
283 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 431 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
284 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 432 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
285 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; 433 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
286 434
287 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; 435 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
288 case REQ_CLOSE: req->result = close (req->fd); break; 436 case REQ_CLOSE: req->result = close (req->fd); break;
289 case REQ_UNLINK: req->result = unlink (req->dataptr); break; 437 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
438 case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
439 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
290 440
291 case REQ_FDATASYNC: 441 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
292#if HAVE_FDATASYNC
293 req->result = fdatasync (req->fd); break;
294#endif
295 case REQ_FSYNC: req->result = fsync (req->fd); break; 442 case REQ_FSYNC: req->result = fsync (req->fd); break;
296 443
297 case REQ_QUIT: 444 case REQ_QUIT:
298 break; 445 break;
299 446
… …
326 while (type != REQ_QUIT); 473 while (type != REQ_QUIT);
327 474
328 return 0; 475 return 0;
329} 476}
330 477
478#define dREQ \
479 aio_req req; \
480 \
481 if (SvOK (callback) && !SvROK (callback)) \
482 croak ("clalback must be undef or of reference type"); \
483 \
484 Newz (0, req, 1, aio_cb); \
485 if (!req) \
486 croak ("out of memory during aio_req allocation"); \
487 \
488 req->callback = SvREFCNT_inc (callback);
489
331MODULE = IO::AIO PACKAGE = IO::AIO 490MODULE = IO::AIO PACKAGE = IO::AIO
332 491
333PROTOTYPES: ENABLE 492PROTOTYPES: ENABLE
334 493
335BOOT: 494BOOT:
… …
340 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) 499 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
341 croak ("cannot set result pipe to nonblocking mode"); 500 croak ("cannot set result pipe to nonblocking mode");
342 501
343 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) 502 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
344 croak ("cannot set result pipe to nonblocking mode"); 503 croak ("cannot set result pipe to nonblocking mode");
504
505 pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
345} 506}
346 507
347void 508void
348min_parallel(nthreads) 509min_parallel(nthreads)
349 int nthreads 510 int nthreads
350 PROTOTYPE: $ 511 PROTOTYPE: $
351 CODE:
352 while (nthreads > started)
353 start_thread ();
354 512
355void 513void
356max_parallel(nthreads) 514max_parallel(nthreads)
357 int nthreads 515 int nthreads
358 PROTOTYPE: $ 516 PROTOTYPE: $
359 CODE:
360{
361 int cur = started;
362 while (cur > nthreads)
363 {
364 end_thread ();
365 cur--;
366 }
367
368 while (started > nthreads)
369 {
370 poll_wait ();
371 poll_cb ();
372 }
373}
374 517
375int 518int
376max_outstanding(nreqs) 519max_outstanding(nreqs)
377 int nreqs 520 int nreqs
378 PROTOTYPE: $ 521 PROTOTYPE: $
… …
387 int mode 530 int mode
388 SV * callback 531 SV * callback
389 PROTOTYPE: $$$;$ 532 PROTOTYPE: $$$;$
390 CODE: 533 CODE:
391{ 534{
392 aio_req req; 535 dREQ;
393
394 Newz (0, req, 1, aio_cb);
395
396 if (!req)
397 croak ("out of memory during aio_req allocation");
398 536
399 req->type = REQ_OPEN; 537 req->type = REQ_OPEN;
400 req->data = newSVsv (pathname); 538 req->data = newSVsv (pathname);
401 req->dataptr = SvPV_nolen (req->data); 539 req->dataptr = SvPVbyte_nolen (req->data);
402 req->fd = flags; 540 req->fd = flags;
403 req->mode = mode; 541 req->mode = mode;
404 req->callback = SvREFCNT_inc (callback);
405 542
406 send_req (req); 543 send_req (req);
407} 544}
408 545
409void 546void
… …
415 aio_close = REQ_CLOSE 552 aio_close = REQ_CLOSE
416 aio_fsync = REQ_FSYNC 553 aio_fsync = REQ_FSYNC
417 aio_fdatasync = REQ_FDATASYNC 554 aio_fdatasync = REQ_FDATASYNC
418 CODE: 555 CODE:
419{ 556{
420 aio_req req; 557 dREQ;
421
422 Newz (0, req, 1, aio_cb);
423
424 if (!req)
425 croak ("out of memory during aio_req allocation");
426 558
427 req->type = ix; 559 req->type = ix;
428 req->fh = newSVsv (fh); 560 req->fh = newSVsv (fh);
429 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 561 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
430 req->callback = SvREFCNT_inc (callback);
431 562
432 send_req (req); 563 send_req (req);
433} 564}
434 565
435void 566void
… …
446 PROTOTYPE: $$$$$;$ 577 PROTOTYPE: $$$$$;$
447 CODE: 578 CODE:
448{ 579{
449 aio_req req; 580 aio_req req;
450 STRLEN svlen; 581 STRLEN svlen;
451 char *svptr = SvPV (data, svlen); 582 char *svptr = SvPVbyte (data, svlen);
452 583
453 SvUPGRADE (data, SVt_PV); 584 SvUPGRADE (data, SVt_PV);
454 SvPOK_on (data); 585 SvPOK_on (data);
455 586
456 if (dataoffset < 0) 587 if (dataoffset < 0)
… …
472 } 603 }
473 604
474 if (length < 0) 605 if (length < 0)
475 croak ("length must not be negative"); 606 croak ("length must not be negative");
476 607
477 Newz (0, req, 1, aio_cb); 608 {
609 dREQ;
478 610
479 if (!req)
480 croak ("out of memory during aio_req allocation");
481
482 req->type = ix; 611 req->type = ix;
483 req->fh = newSVsv (fh); 612 req->fh = newSVsv (fh);
484 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) 613 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
485 : IoOFP (sv_2io (fh))); 614 : IoOFP (sv_2io (fh)));
486 req->offset = offset; 615 req->offset = offset;
487 req->length = length; 616 req->length = length;
488 req->data = SvREFCNT_inc (data); 617 req->data = SvREFCNT_inc (data);
489 req->dataptr = (char *)svptr + dataoffset; 618 req->dataptr = (char *)svptr + dataoffset;
490 req->callback = SvREFCNT_inc (callback); 619 req->callback = SvREFCNT_inc (callback);
491 620
492 send_req (req); 621 send_req (req);
622 }
493} 623}
494 624
495void 625void
496aio_readahead(fh,offset,length,callback=&PL_sv_undef) 626aio_readahead(fh,offset,length,callback=&PL_sv_undef)
497 SV * fh 627 SV * fh
… …
499 IV length 629 IV length
500 SV * callback 630 SV * callback
501 PROTOTYPE: $$$;$ 631 PROTOTYPE: $$$;$
502 CODE: 632 CODE:
503{ 633{
504 aio_req req; 634 dREQ;
505
506 if (length < 0)
507 croak ("length must not be negative");
508
509 Newz (0, req, 1, aio_cb);
510
511 if (!req)
512 croak ("out of memory during aio_req allocation");
513 635
514 req->type = REQ_READAHEAD; 636 req->type = REQ_READAHEAD;
515 req->fh = newSVsv (fh); 637 req->fh = newSVsv (fh);
516 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 638 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
517 req->offset = offset; 639 req->offset = offset;
518 req->length = length; 640 req->length = length;
519 req->callback = SvREFCNT_inc (callback);
520 641
521 send_req (req); 642 send_req (req);
522} 643}
523 644
524void 645void
… …
528 ALIAS: 649 ALIAS:
529 aio_stat = REQ_STAT 650 aio_stat = REQ_STAT
530 aio_lstat = REQ_LSTAT 651 aio_lstat = REQ_LSTAT
531 CODE: 652 CODE:
532{ 653{
533 aio_req req; 654 dREQ;
534
535 Newz (0, req, 1, aio_cb);
536
537 if (!req)
538 croak ("out of memory during aio_req allocation");
539 655
540 New (0, req->statdata, 1, Stat_t); 656 New (0, req->statdata, 1, Stat_t);
541
542 if (!req->statdata) 657 if (!req->statdata)
543 croak ("out of memory during aio_req->statdata allocation"); 658 croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");
544 659
545 if (SvPOK (fh_or_path)) 660 if (SvPOK (fh_or_path))
546 { 661 {
547 req->type = ix; 662 req->type = ix;
548 req->data = newSVsv (fh_or_path); 663 req->data = newSVsv (fh_or_path);
549 req->dataptr = SvPV_nolen (req->data); 664 req->dataptr = SvPVbyte_nolen (req->data);
550 } 665 }
551 else 666 else
552 { 667 {
553 req->type = REQ_FSTAT; 668 req->type = REQ_FSTAT;
554 req->fh = newSVsv (fh_or_path); 669 req->fh = newSVsv (fh_or_path);
555 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); 670 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
556 } 671 }
557 672
558 req->callback = SvREFCNT_inc (callback);
559
560 send_req (req); 673 send_req (req);
561} 674}
562 675
563void 676void
564aio_unlink(pathname,callback=&PL_sv_undef) 677aio_unlink(pathname,callback=&PL_sv_undef)
565 SV * pathname 678 SV * pathname
566 SV * callback 679 SV * callback
680 ALIAS:
681 aio_unlink = REQ_UNLINK
682 aio_rmdir = REQ_RMDIR
567 CODE: 683 CODE:
568{ 684{
569 aio_req req; 685 dREQ;
570 686
571 Newz (0, req, 1, aio_cb); 687 req->type = ix;
688 req->data = newSVsv (pathname);
689 req->dataptr = SvPVbyte_nolen (req->data);
572 690
573 if (!req) 691 send_req (req);
574 croak ("out of memory during aio_req allocation"); 692}
693
694void
695aio_symlink(oldpath,newpath,callback=&PL_sv_undef)
696 SV * oldpath
697 SV * newpath
698 SV * callback
699 CODE:
700{
701 dREQ;
575 702
576 req->type = REQ_UNLINK; 703 req->type = REQ_SYMLINK;
704 req->fh = newSVsv (oldpath);
705 req->data2ptr = SvPVbyte_nolen (req->fh);
577 req->data = newSVsv (pathname); 706 req->data = newSVsv (newpath);
578 req->dataptr = SvPV_nolen (req->data); 707 req->dataptr = SvPVbyte_nolen (req->data);
579 req->callback = SvREFCNT_inc (callback);
580 708
581 send_req (req); 709 send_req (req);
582} 710}
583 711
584void 712void

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