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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 1.25 by root, Wed Aug 17 03:16:56 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 int nstarted;
273
274 for (;;) {
275 while (nreqs)
276 {
277 poll_wait ();
278 poll_cb ();
279 }
280
281 nstarted = started;
282 max_parallel (0);
283
284 pthread_mutex_lock (&reqlock);
285
286 if (!nreqs && !started)
287 break;
288
289 pthread_mutex_unlock (&reqlock);
290
291 min_parallel (fork_started);
292 }
293
294 pthread_mutex_lock (&frklock);
295 fork_started = nstarted;
296 pthread_mutex_lock (&reslock);
297
298 assert (!started);
299 assert (!nreqs);
300 assert (!reqs && !reqe);
301 assert (!ress && !rese);
302}
303
304static void atfork_parent (void)
305{
306 pthread_mutex_unlock (&reslock);
307 pthread_mutex_unlock (&frklock);
308 pthread_mutex_unlock (&reqlock);
309
310 min_parallel (fork_started);
311}
312
313#define atfork_child atfork_parent
314
315/*****************************************************************************/
316/* work around various missing functions */
317
318#if !HAVE_PREADWRITE
319# define pread aio_pread
320# define pwrite aio_pwrite
321
322/*
323 * make our pread/pwrite safe against themselves, but not against
324 * normal read/write by using a mutex. slows down execution a lot,
325 * but that's your problem, not mine.
326 */
327static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
328
329static ssize_t
330pread (int fd, void *buf, size_t count, off_t offset)
331{
332 ssize_t res;
333 off_t ooffset;
334
335 pthread_mutex_lock (&iolock);
336 ooffset = lseek (fd, 0, SEEK_CUR);
337 lseek (fd, offset, SEEK_SET);
338 res = read (fd, buf, count);
339 lseek (fd, ooffset, SEEK_SET);
340 pthread_mutex_unlock (&iolock);
341
342 return res;
343}
344
345static ssize_t
346pwrite (int fd, void *buf, size_t count, off_t offset)
347{
348 ssize_t res;
349 off_t ooffset;
350
351 pthread_mutex_lock (&iolock);
352 ooffset = lseek (fd, 0, SEEK_CUR);
353 lseek (fd, offset, SEEK_SET);
354 res = write (fd, buf, count);
355 lseek (fd, offset, SEEK_SET);
356 pthread_mutex_unlock (&iolock);
357
358 return res;
359}
360#endif
361
362#if !HAVE_FDATASYNC
363# define fdatasync fsync
364#endif
365
366#if !HAVE_READAHEAD
367# define readahead aio_readahead
368
369static char readahead_buf[4096];
370
371static ssize_t
372readahead (int fd, off_t offset, size_t count)
373{
374 while (count > 0)
375 {
376 size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
377
378 pread (fd, readahead_buf, len, offset);
379 offset += len;
380 count -= len;
381 }
382
383 errno = 0;
384}
385#endif
386
387/*****************************************************************************/
388
235static void * 389static void *
236aio_proc (void *thr_arg) 390aio_proc (void *thr_arg)
237{ 391{
238 aio_req req; 392 aio_req req;
239 int type; 393 int type;
… …
264 418
265 type = req->type; 419 type = req->type;
266 420
267 switch (type) 421 switch (type)
268 { 422 {
269#if HAVE_PREADWRITE
270 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; 423 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; 424 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
275 425
276#if HAVE_READAHEAD
277 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 426 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
282 427
283 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 428 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
284 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 429 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
285 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; 430 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
286 431
287 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; 432 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
288 case REQ_CLOSE: req->result = close (req->fd); break; 433 case REQ_CLOSE: req->result = close (req->fd); break;
289 case REQ_UNLINK: req->result = unlink (req->dataptr); break; 434 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
435 case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
436 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
290 437
291 case REQ_FDATASYNC: 438 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; 439 case REQ_FSYNC: req->result = fsync (req->fd); break;
296 440
297 case REQ_QUIT: 441 case REQ_QUIT:
298 break; 442 break;
299 443
… …
326 while (type != REQ_QUIT); 470 while (type != REQ_QUIT);
327 471
328 return 0; 472 return 0;
329} 473}
330 474
475#define dREQ \
476 aio_req req; \
477 \
478 if (SvOK (callback) && !SvROK (callback)) \
479 croak ("clalback must be undef or of reference type"); \
480 \
481 Newz (0, req, 1, aio_cb); \
482 if (!req) \
483 croak ("out of memory during aio_req allocation"); \
484 \
485 req->callback = SvREFCNT_inc (callback);
486
331MODULE = IO::AIO PACKAGE = IO::AIO 487MODULE = IO::AIO PACKAGE = IO::AIO
332 488
333PROTOTYPES: ENABLE 489PROTOTYPES: ENABLE
334 490
335BOOT: 491BOOT:
… …
340 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) 496 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
341 croak ("cannot set result pipe to nonblocking mode"); 497 croak ("cannot set result pipe to nonblocking mode");
342 498
343 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) 499 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
344 croak ("cannot set result pipe to nonblocking mode"); 500 croak ("cannot set result pipe to nonblocking mode");
501
502 pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
345} 503}
346 504
347void 505void
348min_parallel(nthreads) 506min_parallel(nthreads)
349 int nthreads 507 int nthreads
350 PROTOTYPE: $ 508 PROTOTYPE: $
351 CODE:
352 while (nthreads > started)
353 start_thread ();
354 509
355void 510void
356max_parallel(nthreads) 511max_parallel(nthreads)
357 int nthreads 512 int nthreads
358 PROTOTYPE: $ 513 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}
374 514
375int 515int
376max_outstanding(nreqs) 516max_outstanding(nreqs)
377 int nreqs 517 int nreqs
378 PROTOTYPE: $ 518 PROTOTYPE: $
… …
387 int mode 527 int mode
388 SV * callback 528 SV * callback
389 PROTOTYPE: $$$;$ 529 PROTOTYPE: $$$;$
390 CODE: 530 CODE:
391{ 531{
392 aio_req req; 532 dREQ;
393
394 Newz (0, req, 1, aio_cb);
395
396 if (!req)
397 croak ("out of memory during aio_req allocation");
398 533
399 req->type = REQ_OPEN; 534 req->type = REQ_OPEN;
400 req->data = newSVsv (pathname); 535 req->data = newSVsv (pathname);
401 req->dataptr = SvPV_nolen (req->data); 536 req->dataptr = SvPVbyte_nolen (req->data);
402 req->fd = flags; 537 req->fd = flags;
403 req->mode = mode; 538 req->mode = mode;
404 req->callback = SvREFCNT_inc (callback);
405 539
406 send_req (req); 540 send_req (req);
407} 541}
408 542
409void 543void
… …
415 aio_close = REQ_CLOSE 549 aio_close = REQ_CLOSE
416 aio_fsync = REQ_FSYNC 550 aio_fsync = REQ_FSYNC
417 aio_fdatasync = REQ_FDATASYNC 551 aio_fdatasync = REQ_FDATASYNC
418 CODE: 552 CODE:
419{ 553{
420 aio_req req; 554 dREQ;
421
422 Newz (0, req, 1, aio_cb);
423
424 if (!req)
425 croak ("out of memory during aio_req allocation");
426 555
427 req->type = ix; 556 req->type = ix;
428 req->fh = newSVsv (fh); 557 req->fh = newSVsv (fh);
429 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 558 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
430 req->callback = SvREFCNT_inc (callback);
431 559
432 send_req (req); 560 send_req (req);
433} 561}
434 562
435void 563void
… …
446 PROTOTYPE: $$$$$;$ 574 PROTOTYPE: $$$$$;$
447 CODE: 575 CODE:
448{ 576{
449 aio_req req; 577 aio_req req;
450 STRLEN svlen; 578 STRLEN svlen;
451 char *svptr = SvPV (data, svlen); 579 char *svptr = SvPVbyte (data, svlen);
452 580
453 SvUPGRADE (data, SVt_PV); 581 SvUPGRADE (data, SVt_PV);
454 SvPOK_on (data); 582 SvPOK_on (data);
455 583
456 if (dataoffset < 0) 584 if (dataoffset < 0)
… …
472 } 600 }
473 601
474 if (length < 0) 602 if (length < 0)
475 croak ("length must not be negative"); 603 croak ("length must not be negative");
476 604
477 Newz (0, req, 1, aio_cb); 605 {
606 dREQ;
478 607
479 if (!req)
480 croak ("out of memory during aio_req allocation");
481
482 req->type = ix; 608 req->type = ix;
483 req->fh = newSVsv (fh); 609 req->fh = newSVsv (fh);
484 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) 610 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
485 : IoOFP (sv_2io (fh))); 611 : IoOFP (sv_2io (fh)));
486 req->offset = offset; 612 req->offset = offset;
487 req->length = length; 613 req->length = length;
488 req->data = SvREFCNT_inc (data); 614 req->data = SvREFCNT_inc (data);
489 req->dataptr = (char *)svptr + dataoffset; 615 req->dataptr = (char *)svptr + dataoffset;
490 req->callback = SvREFCNT_inc (callback); 616 req->callback = SvREFCNT_inc (callback);
491 617
492 send_req (req); 618 send_req (req);
619 }
493} 620}
494 621
495void 622void
496aio_readahead(fh,offset,length,callback=&PL_sv_undef) 623aio_readahead(fh,offset,length,callback=&PL_sv_undef)
497 SV * fh 624 SV * fh
… …
499 IV length 626 IV length
500 SV * callback 627 SV * callback
501 PROTOTYPE: $$$;$ 628 PROTOTYPE: $$$;$
502 CODE: 629 CODE:
503{ 630{
504 aio_req req; 631 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");
513 632
514 req->type = REQ_READAHEAD; 633 req->type = REQ_READAHEAD;
515 req->fh = newSVsv (fh); 634 req->fh = newSVsv (fh);
516 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 635 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
517 req->offset = offset; 636 req->offset = offset;
518 req->length = length; 637 req->length = length;
519 req->callback = SvREFCNT_inc (callback);
520 638
521 send_req (req); 639 send_req (req);
522} 640}
523 641
524void 642void
… …
528 ALIAS: 646 ALIAS:
529 aio_stat = REQ_STAT 647 aio_stat = REQ_STAT
530 aio_lstat = REQ_LSTAT 648 aio_lstat = REQ_LSTAT
531 CODE: 649 CODE:
532{ 650{
533 aio_req req; 651 dREQ;
534
535 Newz (0, req, 1, aio_cb);
536
537 if (!req)
538 croak ("out of memory during aio_req allocation");
539 652
540 New (0, req->statdata, 1, Stat_t); 653 New (0, req->statdata, 1, Stat_t);
541
542 if (!req->statdata) 654 if (!req->statdata)
543 croak ("out of memory during aio_req->statdata allocation"); 655 croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");
544 656
545 if (SvPOK (fh_or_path)) 657 if (SvPOK (fh_or_path))
546 { 658 {
547 req->type = ix; 659 req->type = ix;
548 req->data = newSVsv (fh_or_path); 660 req->data = newSVsv (fh_or_path);
549 req->dataptr = SvPV_nolen (req->data); 661 req->dataptr = SvPVbyte_nolen (req->data);
550 } 662 }
551 else 663 else
552 { 664 {
553 req->type = REQ_FSTAT; 665 req->type = REQ_FSTAT;
554 req->fh = newSVsv (fh_or_path); 666 req->fh = newSVsv (fh_or_path);
555 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); 667 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
556 } 668 }
557 669
558 req->callback = SvREFCNT_inc (callback);
559
560 send_req (req); 670 send_req (req);
561} 671}
562 672
563void 673void
564aio_unlink(pathname,callback=&PL_sv_undef) 674aio_unlink(pathname,callback=&PL_sv_undef)
565 SV * pathname 675 SV * pathname
566 SV * callback 676 SV * callback
677 ALIAS:
678 aio_unlink = REQ_UNLINK
679 aio_rmdir = REQ_RMDIR
567 CODE: 680 CODE:
568{ 681{
569 aio_req req; 682 dREQ;
570 683
571 Newz (0, req, 1, aio_cb); 684 req->type = ix;
685 req->data = newSVsv (pathname);
686 req->dataptr = SvPVbyte_nolen (req->data);
572 687
573 if (!req) 688 send_req (req);
574 croak ("out of memory during aio_req allocation"); 689}
690
691void
692aio_symlink(oldpath,newpath,callback=&PL_sv_undef)
693 SV * oldpath
694 SV * newpath
695 SV * callback
696 CODE:
697{
698 dREQ;
575 699
576 req->type = REQ_UNLINK; 700 req->type = REQ_SYMLINK;
701 req->fh = newSVsv (oldpath);
702 req->data2ptr = SvPVbyte_nolen (req->fh);
577 req->data = newSVsv (pathname); 703 req->data = newSVsv (newpath);
578 req->dataptr = SvPV_nolen (req->data); 704 req->dataptr = SvPVbyte_nolen (req->data);
579 req->callback = SvREFCNT_inc (callback);
580 705
581 send_req (req); 706 send_req (req);
582} 707}
583 708
584void 709void

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