1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
#include "autoconf/config.h" |
6 |
|
7 |
#include <sys/types.h> |
8 |
#include <sys/stat.h> |
9 |
|
10 |
#include <unistd.h> |
11 |
#include <fcntl.h> |
12 |
#include <signal.h> |
13 |
#include <sched.h> |
14 |
|
15 |
#include <pthread.h> |
16 |
|
17 |
typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
18 |
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
19 |
typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
20 |
|
21 |
#if __ia64 |
22 |
# define STACKSIZE 65536 |
23 |
#else |
24 |
# define STACKSIZE 4096 |
25 |
#endif |
26 |
|
27 |
enum { |
28 |
REQ_QUIT, |
29 |
REQ_OPEN, REQ_CLOSE, |
30 |
REQ_READ, REQ_WRITE, REQ_READAHEAD, |
31 |
REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK, |
32 |
REQ_FSYNC, REQ_FDATASYNC, |
33 |
}; |
34 |
|
35 |
typedef struct aio_cb { |
36 |
struct aio_cb *volatile next; |
37 |
|
38 |
int type; |
39 |
|
40 |
int fd; |
41 |
off_t offset; |
42 |
size_t length; |
43 |
ssize_t result; |
44 |
mode_t mode; /* open */ |
45 |
int errorno; |
46 |
SV *data, *callback, *fh; |
47 |
void *dataptr; |
48 |
STRLEN dataoffset; |
49 |
|
50 |
Stat_t *statdata; |
51 |
} aio_cb; |
52 |
|
53 |
typedef aio_cb *aio_req; |
54 |
|
55 |
static int started; |
56 |
static volatile int nreqs; |
57 |
static int max_outstanding = 1<<30; |
58 |
static int respipe [2]; |
59 |
|
60 |
static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; |
61 |
static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER; |
62 |
static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER; |
63 |
|
64 |
static volatile aio_req reqs, reqe; /* queue start, queue end */ |
65 |
static volatile aio_req ress, rese; /* queue start, queue end */ |
66 |
|
67 |
static void |
68 |
poll_wait () |
69 |
{ |
70 |
if (nreqs && !ress) |
71 |
{ |
72 |
fd_set rfd; |
73 |
FD_ZERO(&rfd); |
74 |
FD_SET(respipe [0], &rfd); |
75 |
|
76 |
select (respipe [0] + 1, &rfd, 0, 0, 0); |
77 |
} |
78 |
} |
79 |
|
80 |
static int |
81 |
poll_cb () |
82 |
{ |
83 |
dSP; |
84 |
int count = 0; |
85 |
aio_req req, prv; |
86 |
|
87 |
pthread_mutex_lock (&reslock); |
88 |
|
89 |
{ |
90 |
/* read any signals sent by the worker threads */ |
91 |
char buf [32]; |
92 |
while (read (respipe [0], buf, 32) > 0) |
93 |
; |
94 |
} |
95 |
|
96 |
req = ress; |
97 |
ress = rese = 0; |
98 |
|
99 |
pthread_mutex_unlock (&reslock); |
100 |
|
101 |
while (req) |
102 |
{ |
103 |
nreqs--; |
104 |
|
105 |
if (req->type == REQ_QUIT) |
106 |
started--; |
107 |
else |
108 |
{ |
109 |
int errorno = errno; |
110 |
errno = req->errorno; |
111 |
|
112 |
if (req->type == REQ_READ) |
113 |
SvCUR_set (req->data, req->dataoffset |
114 |
+ req->result > 0 ? req->result : 0); |
115 |
|
116 |
if (req->data) |
117 |
SvREFCNT_dec (req->data); |
118 |
|
119 |
if (req->fh) |
120 |
SvREFCNT_dec (req->fh); |
121 |
|
122 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
123 |
{ |
124 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
125 |
PL_laststatval = req->result; |
126 |
PL_statcache = *(req->statdata); |
127 |
|
128 |
Safefree (req->statdata); |
129 |
} |
130 |
|
131 |
ENTER; |
132 |
PUSHMARK (SP); |
133 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
134 |
|
135 |
if (req->type == REQ_OPEN) |
136 |
{ |
137 |
/* convert fd to fh */ |
138 |
SV *fh; |
139 |
|
140 |
PUTBACK; |
141 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
142 |
SPAGAIN; |
143 |
|
144 |
fh = SvREFCNT_inc (POPs); |
145 |
|
146 |
PUSHMARK (SP); |
147 |
XPUSHs (sv_2mortal (fh)); |
148 |
} |
149 |
|
150 |
if (SvOK (req->callback)) |
151 |
{ |
152 |
PUTBACK; |
153 |
call_sv (req->callback, G_VOID | G_EVAL); |
154 |
SPAGAIN; |
155 |
} |
156 |
|
157 |
LEAVE; |
158 |
|
159 |
if (req->callback) |
160 |
SvREFCNT_dec (req->callback); |
161 |
|
162 |
errno = errorno; |
163 |
count++; |
164 |
} |
165 |
|
166 |
prv = req; |
167 |
req = req->next; |
168 |
Safefree (prv); |
169 |
|
170 |
/* TODO: croak on errors? */ |
171 |
} |
172 |
|
173 |
return count; |
174 |
} |
175 |
|
176 |
static void *aio_proc(void *arg); |
177 |
|
178 |
static void |
179 |
start_thread (void) |
180 |
{ |
181 |
sigset_t fullsigset, oldsigset; |
182 |
pthread_t tid; |
183 |
pthread_attr_t attr; |
184 |
|
185 |
pthread_attr_init (&attr); |
186 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
187 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
188 |
|
189 |
sigfillset (&fullsigset); |
190 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
191 |
|
192 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
193 |
started++; |
194 |
|
195 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
196 |
} |
197 |
|
198 |
static void |
199 |
send_req (aio_req req) |
200 |
{ |
201 |
nreqs++; |
202 |
|
203 |
pthread_mutex_lock (&reqlock); |
204 |
|
205 |
req->next = 0; |
206 |
|
207 |
if (reqe) |
208 |
{ |
209 |
reqe->next = req; |
210 |
reqe = req; |
211 |
} |
212 |
else |
213 |
reqe = reqs = req; |
214 |
|
215 |
pthread_cond_signal (&reqwait); |
216 |
pthread_mutex_unlock (&reqlock); |
217 |
|
218 |
while (nreqs > max_outstanding) |
219 |
{ |
220 |
poll_wait (); |
221 |
poll_cb (); |
222 |
} |
223 |
} |
224 |
|
225 |
static void |
226 |
end_thread (void) |
227 |
{ |
228 |
aio_req req; |
229 |
New (0, req, 1, aio_cb); |
230 |
req->type = REQ_QUIT; |
231 |
|
232 |
send_req (req); |
233 |
} |
234 |
|
235 |
/* work around various missing functions */ |
236 |
|
237 |
#if !HAVE_PREADWRITE |
238 |
# define pread aio_pread |
239 |
# define pwrite aio_pwrite |
240 |
|
241 |
/* |
242 |
* make our pread/pwrite safe against themselves, but not against |
243 |
* normal read/write by using a mutex. slows down execution a lot, |
244 |
* but that's your problem, not mine. |
245 |
*/ |
246 |
static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
247 |
|
248 |
static ssize_t |
249 |
pread (int fd, void *buf, size_t count, off_t offset) |
250 |
{ |
251 |
ssize_t res; |
252 |
off_t ooffset; |
253 |
|
254 |
pthread_mutex_lock (&iolock); |
255 |
ooffset = lseek (fd, 0, SEEK_CUR); |
256 |
lseek (fd, offset, SEEK_SET); |
257 |
res = read (fd, buf, count); |
258 |
lseek (fd, ooffset, SEEK_SET); |
259 |
pthread_mutex_unlock (&iolock); |
260 |
|
261 |
return res; |
262 |
} |
263 |
|
264 |
static ssize_t |
265 |
pwrite (int fd, void *buf, size_t count, off_t offset) |
266 |
{ |
267 |
ssize_t res; |
268 |
off_t ooffset; |
269 |
|
270 |
pthread_mutex_lock (&iolock); |
271 |
ooffset = lseek (fd, 0, SEEK_CUR); |
272 |
lseek (fd, offset, SEEK_SET); |
273 |
res = write (fd, buf, count); |
274 |
lseek (fd, offset, SEEK_SET); |
275 |
pthread_mutex_unlock (&iolock); |
276 |
|
277 |
return res; |
278 |
} |
279 |
#endif |
280 |
|
281 |
#if !HAVE_FDATASYNC |
282 |
# define fdatasync fsync |
283 |
#endif |
284 |
|
285 |
#if !HAVE_READAHEAD |
286 |
# define readahead aio_readahead |
287 |
|
288 |
static char readahead_buf[4096]; |
289 |
|
290 |
static ssize_t |
291 |
readahead (int fd, off_t offset, size_t count) |
292 |
{ |
293 |
while (count > 0) |
294 |
{ |
295 |
size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
296 |
|
297 |
pread (fd, readahead_buf, len, offset); |
298 |
offset += len; |
299 |
count -= len; |
300 |
} |
301 |
|
302 |
errno = 0; |
303 |
} |
304 |
#endif |
305 |
|
306 |
static void * |
307 |
aio_proc (void *thr_arg) |
308 |
{ |
309 |
aio_req req; |
310 |
int type; |
311 |
|
312 |
do |
313 |
{ |
314 |
pthread_mutex_lock (&reqlock); |
315 |
|
316 |
for (;;) |
317 |
{ |
318 |
req = reqs; |
319 |
|
320 |
if (reqs) |
321 |
{ |
322 |
reqs = reqs->next; |
323 |
if (!reqs) reqe = 0; |
324 |
} |
325 |
|
326 |
if (req) |
327 |
break; |
328 |
|
329 |
pthread_cond_wait (&reqwait, &reqlock); |
330 |
} |
331 |
|
332 |
pthread_mutex_unlock (&reqlock); |
333 |
|
334 |
errno = 0; /* strictly unnecessary */ |
335 |
|
336 |
type = req->type; |
337 |
|
338 |
switch (type) |
339 |
{ |
340 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
341 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
342 |
|
343 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
344 |
|
345 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
346 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
347 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
348 |
|
349 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
350 |
case REQ_CLOSE: req->result = close (req->fd); break; |
351 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
352 |
|
353 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
354 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
355 |
|
356 |
case REQ_QUIT: |
357 |
break; |
358 |
|
359 |
default: |
360 |
req->result = ENOSYS; |
361 |
break; |
362 |
} |
363 |
|
364 |
req->errorno = errno; |
365 |
|
366 |
pthread_mutex_lock (&reslock); |
367 |
|
368 |
req->next = 0; |
369 |
|
370 |
if (rese) |
371 |
{ |
372 |
rese->next = req; |
373 |
rese = req; |
374 |
} |
375 |
else |
376 |
{ |
377 |
rese = ress = req; |
378 |
|
379 |
/* write a dummy byte to the pipe so fh becomes ready */ |
380 |
write (respipe [1], &respipe, 1); |
381 |
} |
382 |
|
383 |
pthread_mutex_unlock (&reslock); |
384 |
} |
385 |
while (type != REQ_QUIT); |
386 |
|
387 |
return 0; |
388 |
} |
389 |
|
390 |
MODULE = IO::AIO PACKAGE = IO::AIO |
391 |
|
392 |
PROTOTYPES: ENABLE |
393 |
|
394 |
BOOT: |
395 |
{ |
396 |
if (pipe (respipe)) |
397 |
croak ("unable to initialize result pipe"); |
398 |
|
399 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
400 |
croak ("cannot set result pipe to nonblocking mode"); |
401 |
|
402 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
403 |
croak ("cannot set result pipe to nonblocking mode"); |
404 |
} |
405 |
|
406 |
void |
407 |
min_parallel(nthreads) |
408 |
int nthreads |
409 |
PROTOTYPE: $ |
410 |
CODE: |
411 |
while (nthreads > started) |
412 |
start_thread (); |
413 |
|
414 |
void |
415 |
max_parallel(nthreads) |
416 |
int nthreads |
417 |
PROTOTYPE: $ |
418 |
CODE: |
419 |
{ |
420 |
int cur = started; |
421 |
while (cur > nthreads) |
422 |
{ |
423 |
end_thread (); |
424 |
cur--; |
425 |
} |
426 |
|
427 |
while (started > nthreads) |
428 |
{ |
429 |
poll_wait (); |
430 |
poll_cb (); |
431 |
} |
432 |
} |
433 |
|
434 |
int |
435 |
max_outstanding(nreqs) |
436 |
int nreqs |
437 |
PROTOTYPE: $ |
438 |
CODE: |
439 |
RETVAL = max_outstanding; |
440 |
max_outstanding = nreqs; |
441 |
|
442 |
void |
443 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
444 |
SV * pathname |
445 |
int flags |
446 |
int mode |
447 |
SV * callback |
448 |
PROTOTYPE: $$$;$ |
449 |
CODE: |
450 |
{ |
451 |
aio_req req; |
452 |
|
453 |
Newz (0, req, 1, aio_cb); |
454 |
|
455 |
if (!req) |
456 |
croak ("out of memory during aio_req allocation"); |
457 |
|
458 |
req->type = REQ_OPEN; |
459 |
req->data = newSVsv (pathname); |
460 |
req->dataptr = SvPV_nolen (req->data); |
461 |
req->fd = flags; |
462 |
req->mode = mode; |
463 |
req->callback = SvREFCNT_inc (callback); |
464 |
|
465 |
send_req (req); |
466 |
} |
467 |
|
468 |
void |
469 |
aio_close(fh,callback=&PL_sv_undef) |
470 |
SV * fh |
471 |
SV * callback |
472 |
PROTOTYPE: $;$ |
473 |
ALIAS: |
474 |
aio_close = REQ_CLOSE |
475 |
aio_fsync = REQ_FSYNC |
476 |
aio_fdatasync = REQ_FDATASYNC |
477 |
CODE: |
478 |
{ |
479 |
aio_req req; |
480 |
|
481 |
Newz (0, req, 1, aio_cb); |
482 |
|
483 |
if (!req) |
484 |
croak ("out of memory during aio_req allocation"); |
485 |
|
486 |
req->type = ix; |
487 |
req->fh = newSVsv (fh); |
488 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
489 |
req->callback = SvREFCNT_inc (callback); |
490 |
|
491 |
send_req (req); |
492 |
} |
493 |
|
494 |
void |
495 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
496 |
SV * fh |
497 |
UV offset |
498 |
IV length |
499 |
SV * data |
500 |
IV dataoffset |
501 |
SV * callback |
502 |
ALIAS: |
503 |
aio_read = REQ_READ |
504 |
aio_write = REQ_WRITE |
505 |
PROTOTYPE: $$$$$;$ |
506 |
CODE: |
507 |
{ |
508 |
aio_req req; |
509 |
STRLEN svlen; |
510 |
char *svptr = SvPV (data, svlen); |
511 |
|
512 |
SvUPGRADE (data, SVt_PV); |
513 |
SvPOK_on (data); |
514 |
|
515 |
if (dataoffset < 0) |
516 |
dataoffset += svlen; |
517 |
|
518 |
if (dataoffset < 0 || dataoffset > svlen) |
519 |
croak ("data offset outside of string"); |
520 |
|
521 |
if (ix == REQ_WRITE) |
522 |
{ |
523 |
/* write: check length and adjust. */ |
524 |
if (length < 0 || length + dataoffset > svlen) |
525 |
length = svlen - dataoffset; |
526 |
} |
527 |
else |
528 |
{ |
529 |
/* read: grow scalar as necessary */ |
530 |
svptr = SvGROW (data, length + dataoffset); |
531 |
} |
532 |
|
533 |
if (length < 0) |
534 |
croak ("length must not be negative"); |
535 |
|
536 |
Newz (0, req, 1, aio_cb); |
537 |
|
538 |
if (!req) |
539 |
croak ("out of memory during aio_req allocation"); |
540 |
|
541 |
req->type = ix; |
542 |
req->fh = newSVsv (fh); |
543 |
req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) |
544 |
: IoOFP (sv_2io (fh))); |
545 |
req->offset = offset; |
546 |
req->length = length; |
547 |
req->data = SvREFCNT_inc (data); |
548 |
req->dataptr = (char *)svptr + dataoffset; |
549 |
req->callback = SvREFCNT_inc (callback); |
550 |
|
551 |
send_req (req); |
552 |
} |
553 |
|
554 |
void |
555 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
556 |
SV * fh |
557 |
UV offset |
558 |
IV length |
559 |
SV * callback |
560 |
PROTOTYPE: $$$;$ |
561 |
CODE: |
562 |
{ |
563 |
aio_req req; |
564 |
|
565 |
if (length < 0) |
566 |
croak ("length must not be negative"); |
567 |
|
568 |
Newz (0, req, 1, aio_cb); |
569 |
|
570 |
if (!req) |
571 |
croak ("out of memory during aio_req allocation"); |
572 |
|
573 |
req->type = REQ_READAHEAD; |
574 |
req->fh = newSVsv (fh); |
575 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
576 |
req->offset = offset; |
577 |
req->length = length; |
578 |
req->callback = SvREFCNT_inc (callback); |
579 |
|
580 |
send_req (req); |
581 |
} |
582 |
|
583 |
void |
584 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
585 |
SV * fh_or_path |
586 |
SV * callback |
587 |
ALIAS: |
588 |
aio_stat = REQ_STAT |
589 |
aio_lstat = REQ_LSTAT |
590 |
CODE: |
591 |
{ |
592 |
aio_req req; |
593 |
|
594 |
Newz (0, req, 1, aio_cb); |
595 |
|
596 |
if (!req) |
597 |
croak ("out of memory during aio_req allocation"); |
598 |
|
599 |
New (0, req->statdata, 1, Stat_t); |
600 |
|
601 |
if (!req->statdata) |
602 |
croak ("out of memory during aio_req->statdata allocation"); |
603 |
|
604 |
if (SvPOK (fh_or_path)) |
605 |
{ |
606 |
req->type = ix; |
607 |
req->data = newSVsv (fh_or_path); |
608 |
req->dataptr = SvPV_nolen (req->data); |
609 |
} |
610 |
else |
611 |
{ |
612 |
req->type = REQ_FSTAT; |
613 |
req->fh = newSVsv (fh_or_path); |
614 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
615 |
} |
616 |
|
617 |
req->callback = SvREFCNT_inc (callback); |
618 |
|
619 |
send_req (req); |
620 |
} |
621 |
|
622 |
void |
623 |
aio_unlink(pathname,callback=&PL_sv_undef) |
624 |
SV * pathname |
625 |
SV * callback |
626 |
CODE: |
627 |
{ |
628 |
aio_req req; |
629 |
|
630 |
Newz (0, req, 1, aio_cb); |
631 |
|
632 |
if (!req) |
633 |
croak ("out of memory during aio_req allocation"); |
634 |
|
635 |
req->type = REQ_UNLINK; |
636 |
req->data = newSVsv (pathname); |
637 |
req->dataptr = SvPV_nolen (req->data); |
638 |
req->callback = SvREFCNT_inc (callback); |
639 |
|
640 |
send_req (req); |
641 |
} |
642 |
|
643 |
void |
644 |
flush() |
645 |
PROTOTYPE: |
646 |
CODE: |
647 |
while (nreqs) |
648 |
{ |
649 |
poll_wait (); |
650 |
poll_cb (); |
651 |
} |
652 |
|
653 |
void |
654 |
poll() |
655 |
PROTOTYPE: |
656 |
CODE: |
657 |
if (nreqs) |
658 |
{ |
659 |
poll_wait (); |
660 |
poll_cb (); |
661 |
} |
662 |
|
663 |
int |
664 |
poll_fileno() |
665 |
PROTOTYPE: |
666 |
CODE: |
667 |
RETVAL = respipe [0]; |
668 |
OUTPUT: |
669 |
RETVAL |
670 |
|
671 |
int |
672 |
poll_cb(...) |
673 |
PROTOTYPE: |
674 |
CODE: |
675 |
RETVAL = poll_cb (); |
676 |
OUTPUT: |
677 |
RETVAL |
678 |
|
679 |
void |
680 |
poll_wait() |
681 |
PROTOTYPE: |
682 |
CODE: |
683 |
if (nreqs) |
684 |
poll_wait (); |
685 |
|
686 |
int |
687 |
nreqs() |
688 |
PROTOTYPE: |
689 |
CODE: |
690 |
RETVAL = nreqs; |
691 |
OUTPUT: |
692 |
RETVAL |
693 |
|