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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 1.23 by root, Tue Aug 16 23:33:34 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
… …
87 pthread_mutex_lock (&reslock); 93 pthread_mutex_lock (&reslock);
88 94
89 { 95 {
90 /* read any signals sent by the worker threads */ 96 /* read any signals sent by the worker threads */
91 char buf [32]; 97 char buf [32];
92 while (read (respipe [0], buf, 32) > 0) 98 while (read (respipe [0], buf, 32) == 32)
93 ; 99 ;
94 } 100 }
95 101
96 req = ress; 102 req = ress;
97 ress = rese = 0; 103 ress = rese = 0;
… …
230 req->type = REQ_QUIT; 236 req->type = REQ_QUIT;
231 237
232 send_req (req); 238 send_req (req);
233} 239}
234 240
241
242static void min_parallel (int nthreads)
243{
244 while (nthreads > started)
245 start_thread ();
246}
247
248static void max_parallel (int nthreads)
249{
250 int cur = started;
251 while (cur > nthreads)
252 {
253 end_thread ();
254 cur--;
255 }
256
257 while (started > nthreads)
258 {
259 poll_wait ();
260 poll_cb ();
261 }
262}
263
264static int fork_started;
265
266static void atfork_prepare (void)
267{
268 pthread_mutex_lock (&frklock);
269
270 fork_started = started;
271
272 for (;;) {
273 while (nreqs)
274 {
275 poll_wait ();
276 poll_cb ();
277 }
278
279 max_parallel (0);
280
281 pthread_mutex_lock (&reqlock);
282
283 if (!nreqs && !started)
284 break;
285
286 pthread_mutex_unlock (&reqlock);
287
288 min_parallel (fork_started);
289 }
290
291 pthread_mutex_lock (&reslock);
292
293 assert (!started);
294 assert (!nreqs);
295 assert (!reqs && !reqe);
296 assert (!ress && !rese);
297}
298
299static void atfork_parent (void)
300{
301 pthread_mutex_unlock (&reslock);
302 min_parallel (fork_started);
303 pthread_mutex_unlock (&reqlock);
304 pthread_mutex_unlock (&frklock);
305}
306
307static void atfork_child (void)
308{
309 reqs = reqe = 0;
310
311 atfork_parent ();
312}
313
314/*****************************************************************************/
315/* work around various missing functions */
316
317#if !HAVE_PREADWRITE
318# define pread aio_pread
319# define pwrite aio_pwrite
320
321/*
322 * make our pread/pwrite safe against themselves, but not against
323 * normal read/write by using a mutex. slows down execution a lot,
324 * but that's your problem, not mine.
325 */
326static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
327
328static ssize_t
329pread (int fd, void *buf, size_t count, off_t offset)
330{
331 ssize_t res;
332 off_t ooffset;
333
334 pthread_mutex_lock (&iolock);
335 ooffset = lseek (fd, 0, SEEK_CUR);
336 lseek (fd, offset, SEEK_SET);
337 res = read (fd, buf, count);
338 lseek (fd, ooffset, SEEK_SET);
339 pthread_mutex_unlock (&iolock);
340
341 return res;
342}
343
344static ssize_t
345pwrite (int fd, void *buf, size_t count, off_t offset)
346{
347 ssize_t res;
348 off_t ooffset;
349
350 pthread_mutex_lock (&iolock);
351 ooffset = lseek (fd, 0, SEEK_CUR);
352 lseek (fd, offset, SEEK_SET);
353 res = write (fd, buf, count);
354 lseek (fd, offset, SEEK_SET);
355 pthread_mutex_unlock (&iolock);
356
357 return res;
358}
359#endif
360
361#if !HAVE_FDATASYNC
362# define fdatasync fsync
363#endif
364
365#if !HAVE_READAHEAD
366# define readahead aio_readahead
367
368static char readahead_buf[4096];
369
370static ssize_t
371readahead (int fd, off_t offset, size_t count)
372{
373 while (count > 0)
374 {
375 size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
376
377 pread (fd, readahead_buf, len, offset);
378 offset += len;
379 count -= len;
380 }
381
382 errno = 0;
383}
384#endif
385
386/*****************************************************************************/
387
235static void * 388static void *
236aio_proc (void *thr_arg) 389aio_proc (void *thr_arg)
237{ 390{
238 aio_req req; 391 aio_req req;
239 int type; 392 int type;
… …
264 417
265 type = req->type; 418 type = req->type;
266 419
267 switch (type) 420 switch (type)
268 { 421 {
269#if HAVE_PREADWRITE
270 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; 422 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; 423 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
275 424
276#if HAVE_READAHEAD
277 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 425 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
282 426
283 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 427 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
284 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 428 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
285 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; 429 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
286 430
287 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; 431 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
288 case REQ_CLOSE: req->result = close (req->fd); break; 432 case REQ_CLOSE: req->result = close (req->fd); break;
289 case REQ_UNLINK: req->result = unlink (req->dataptr); break; 433 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
434 case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
435 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
290 436
291 case REQ_FDATASYNC: 437 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; 438 case REQ_FSYNC: req->result = fsync (req->fd); break;
296 439
297 case REQ_QUIT: 440 case REQ_QUIT:
298 break; 441 break;
299 442
… …
326 while (type != REQ_QUIT); 469 while (type != REQ_QUIT);
327 470
328 return 0; 471 return 0;
329} 472}
330 473
474#define dREQ \
475 aio_req req; \
476 \
477 if (SvOK (callback) && !SvROK (callback)) \
478 croak ("clalback must be undef or of reference type"); \
479 \
480 Newz (0, req, 1, aio_cb); \
481 if (!req) \
482 croak ("out of memory during aio_req allocation"); \
483 \
484 req->callback = SvREFCNT_inc (callback);
485
331MODULE = IO::AIO PACKAGE = IO::AIO 486MODULE = IO::AIO PACKAGE = IO::AIO
332 487
333PROTOTYPES: ENABLE 488PROTOTYPES: ENABLE
334 489
335BOOT: 490BOOT:
… …
340 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) 495 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
341 croak ("cannot set result pipe to nonblocking mode"); 496 croak ("cannot set result pipe to nonblocking mode");
342 497
343 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) 498 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
344 croak ("cannot set result pipe to nonblocking mode"); 499 croak ("cannot set result pipe to nonblocking mode");
500
501 pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
345} 502}
346 503
347void 504void
348min_parallel(nthreads) 505min_parallel(nthreads)
349 int nthreads 506 int nthreads
350 PROTOTYPE: $ 507 PROTOTYPE: $
351 CODE:
352 while (nthreads > started)
353 start_thread ();
354 508
355void 509void
356max_parallel(nthreads) 510max_parallel(nthreads)
357 int nthreads 511 int nthreads
358 PROTOTYPE: $ 512 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}
374 513
375int 514int
376max_outstanding(nreqs) 515max_outstanding(nreqs)
377 int nreqs 516 int nreqs
378 PROTOTYPE: $ 517 PROTOTYPE: $
… …
387 int mode 526 int mode
388 SV * callback 527 SV * callback
389 PROTOTYPE: $$$;$ 528 PROTOTYPE: $$$;$
390 CODE: 529 CODE:
391{ 530{
392 aio_req req; 531 dREQ;
393
394 Newz (0, req, 1, aio_cb);
395
396 if (!req)
397 croak ("out of memory during aio_req allocation");
398 532
399 req->type = REQ_OPEN; 533 req->type = REQ_OPEN;
400 req->data = newSVsv (pathname); 534 req->data = newSVsv (pathname);
401 req->dataptr = SvPV_nolen (req->data); 535 req->dataptr = SvPVbyte_nolen (req->data);
402 req->fd = flags; 536 req->fd = flags;
403 req->mode = mode; 537 req->mode = mode;
404 req->callback = SvREFCNT_inc (callback);
405 538
406 send_req (req); 539 send_req (req);
407} 540}
408 541
409void 542void
… …
415 aio_close = REQ_CLOSE 548 aio_close = REQ_CLOSE
416 aio_fsync = REQ_FSYNC 549 aio_fsync = REQ_FSYNC
417 aio_fdatasync = REQ_FDATASYNC 550 aio_fdatasync = REQ_FDATASYNC
418 CODE: 551 CODE:
419{ 552{
420 aio_req req; 553 dREQ;
421
422 Newz (0, req, 1, aio_cb);
423
424 if (!req)
425 croak ("out of memory during aio_req allocation");
426 554
427 req->type = ix; 555 req->type = ix;
428 req->fh = newSVsv (fh); 556 req->fh = newSVsv (fh);
429 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 557 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
430 req->callback = SvREFCNT_inc (callback);
431 558
432 send_req (req); 559 send_req (req);
433} 560}
434 561
435void 562void
… …
446 PROTOTYPE: $$$$$;$ 573 PROTOTYPE: $$$$$;$
447 CODE: 574 CODE:
448{ 575{
449 aio_req req; 576 aio_req req;
450 STRLEN svlen; 577 STRLEN svlen;
451 char *svptr = SvPV (data, svlen); 578 char *svptr = SvPVbyte (data, svlen);
452 579
453 SvUPGRADE (data, SVt_PV); 580 SvUPGRADE (data, SVt_PV);
454 SvPOK_on (data); 581 SvPOK_on (data);
455 582
456 if (dataoffset < 0) 583 if (dataoffset < 0)
… …
472 } 599 }
473 600
474 if (length < 0) 601 if (length < 0)
475 croak ("length must not be negative"); 602 croak ("length must not be negative");
476 603
477 Newz (0, req, 1, aio_cb); 604 {
605 dREQ;
478 606
479 if (!req)
480 croak ("out of memory during aio_req allocation");
481
482 req->type = ix; 607 req->type = ix;
483 req->fh = newSVsv (fh); 608 req->fh = newSVsv (fh);
484 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) 609 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
485 : IoOFP (sv_2io (fh))); 610 : IoOFP (sv_2io (fh)));
486 req->offset = offset; 611 req->offset = offset;
487 req->length = length; 612 req->length = length;
488 req->data = SvREFCNT_inc (data); 613 req->data = SvREFCNT_inc (data);
489 req->dataptr = (char *)svptr + dataoffset; 614 req->dataptr = (char *)svptr + dataoffset;
490 req->callback = SvREFCNT_inc (callback); 615 req->callback = SvREFCNT_inc (callback);
491 616
492 send_req (req); 617 send_req (req);
618 }
493} 619}
494 620
495void 621void
496aio_readahead(fh,offset,length,callback=&PL_sv_undef) 622aio_readahead(fh,offset,length,callback=&PL_sv_undef)
497 SV * fh 623 SV * fh
… …
499 IV length 625 IV length
500 SV * callback 626 SV * callback
501 PROTOTYPE: $$$;$ 627 PROTOTYPE: $$$;$
502 CODE: 628 CODE:
503{ 629{
504 aio_req req; 630 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");
513 631
514 req->type = REQ_READAHEAD; 632 req->type = REQ_READAHEAD;
515 req->fh = newSVsv (fh); 633 req->fh = newSVsv (fh);
516 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 634 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
517 req->offset = offset; 635 req->offset = offset;
518 req->length = length; 636 req->length = length;
519 req->callback = SvREFCNT_inc (callback);
520 637
521 send_req (req); 638 send_req (req);
522} 639}
523 640
524void 641void
… …
528 ALIAS: 645 ALIAS:
529 aio_stat = REQ_STAT 646 aio_stat = REQ_STAT
530 aio_lstat = REQ_LSTAT 647 aio_lstat = REQ_LSTAT
531 CODE: 648 CODE:
532{ 649{
533 aio_req req; 650 dREQ;
534
535 Newz (0, req, 1, aio_cb);
536
537 if (!req)
538 croak ("out of memory during aio_req allocation");
539 651
540 New (0, req->statdata, 1, Stat_t); 652 New (0, req->statdata, 1, Stat_t);
541
542 if (!req->statdata) 653 if (!req->statdata)
543 croak ("out of memory during aio_req->statdata allocation"); 654 croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");
544 655
545 if (SvPOK (fh_or_path)) 656 if (SvPOK (fh_or_path))
546 { 657 {
547 req->type = ix; 658 req->type = ix;
548 req->data = newSVsv (fh_or_path); 659 req->data = newSVsv (fh_or_path);
549 req->dataptr = SvPV_nolen (req->data); 660 req->dataptr = SvPVbyte_nolen (req->data);
550 } 661 }
551 else 662 else
552 { 663 {
553 req->type = REQ_FSTAT; 664 req->type = REQ_FSTAT;
554 req->fh = newSVsv (fh_or_path); 665 req->fh = newSVsv (fh_or_path);
555 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); 666 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
556 } 667 }
557 668
558 req->callback = SvREFCNT_inc (callback);
559
560 send_req (req); 669 send_req (req);
561} 670}
562 671
563void 672void
564aio_unlink(pathname,callback=&PL_sv_undef) 673aio_unlink(pathname,callback=&PL_sv_undef)
565 SV * pathname 674 SV * pathname
566 SV * callback 675 SV * callback
676 ALIAS:
677 aio_unlink = REQ_UNLINK
678 aio_rmdir = REQ_RMDIR
567 CODE: 679 CODE:
568{ 680{
569 aio_req req; 681 dREQ;
570 682
571 Newz (0, req, 1, aio_cb); 683 req->type = ix;
684 req->data = newSVsv (pathname);
685 req->dataptr = SvPVbyte_nolen (req->data);
572 686
573 if (!req) 687 send_req (req);
574 croak ("out of memory during aio_req allocation"); 688}
689
690void
691aio_symlink(oldpath,newpath,callback=&PL_sv_undef)
692 SV * oldpath
693 SV * newpath
694 SV * callback
695 CODE:
696{
697 dREQ;
575 698
576 req->type = REQ_UNLINK; 699 req->type = REQ_SYMLINK;
700 req->fh = newSVsv (oldpath);
701 req->data2ptr = SvPVbyte_nolen (req->fh);
577 req->data = newSVsv (pathname); 702 req->data = newSVsv (newpath);
578 req->dataptr = SvPV_nolen (req->data); 703 req->dataptr = SvPVbyte_nolen (req->data);
579 req->callback = SvREFCNT_inc (callback);
580 704
581 send_req (req); 705 send_req (req);
582} 706}
583 707
584void 708void

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