1 |
#define _REENTRANT 1 |
2 |
#include <errno.h> |
3 |
|
4 |
#include "EXTERN.h" |
5 |
#include "perl.h" |
6 |
#include "XSUB.h" |
7 |
|
8 |
#include "autoconf/config.h" |
9 |
|
10 |
#include <sys/types.h> |
11 |
#include <sys/stat.h> |
12 |
|
13 |
#include <unistd.h> |
14 |
#include <fcntl.h> |
15 |
#include <signal.h> |
16 |
#include <sched.h> |
17 |
|
18 |
#include <pthread.h> |
19 |
|
20 |
typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
21 |
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
22 |
typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
23 |
|
24 |
#if __ia64 |
25 |
# define STACKSIZE 65536 |
26 |
#else |
27 |
# define STACKSIZE 4096 |
28 |
#endif |
29 |
|
30 |
enum { |
31 |
REQ_QUIT, |
32 |
REQ_OPEN, REQ_CLOSE, |
33 |
REQ_READ, REQ_WRITE, REQ_READAHEAD, |
34 |
REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK, |
35 |
REQ_FSYNC, REQ_FDATASYNC, |
36 |
}; |
37 |
|
38 |
typedef struct aio_cb { |
39 |
struct aio_cb *volatile next; |
40 |
|
41 |
int type; |
42 |
|
43 |
int fd; |
44 |
off_t offset; |
45 |
size_t length; |
46 |
ssize_t result; |
47 |
mode_t mode; /* open */ |
48 |
int errorno; |
49 |
SV *data, *callback, *fh; |
50 |
void *dataptr; |
51 |
STRLEN dataoffset; |
52 |
|
53 |
Stat_t *statdata; |
54 |
} aio_cb; |
55 |
|
56 |
typedef aio_cb *aio_req; |
57 |
|
58 |
static int started; |
59 |
static volatile int nreqs; |
60 |
static int max_outstanding = 1<<30; |
61 |
static int respipe [2]; |
62 |
|
63 |
static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; |
64 |
static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER; |
65 |
static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER; |
66 |
|
67 |
static volatile aio_req reqs, reqe; /* queue start, queue end */ |
68 |
static volatile aio_req ress, rese; /* queue start, queue end */ |
69 |
|
70 |
static void |
71 |
poll_wait () |
72 |
{ |
73 |
if (nreqs && !ress) |
74 |
{ |
75 |
fd_set rfd; |
76 |
FD_ZERO(&rfd); |
77 |
FD_SET(respipe [0], &rfd); |
78 |
|
79 |
select (respipe [0] + 1, &rfd, 0, 0, 0); |
80 |
} |
81 |
} |
82 |
|
83 |
static int |
84 |
poll_cb () |
85 |
{ |
86 |
dSP; |
87 |
int count = 0; |
88 |
aio_req req, prv; |
89 |
|
90 |
pthread_mutex_lock (&reslock); |
91 |
|
92 |
{ |
93 |
/* read any signals sent by the worker threads */ |
94 |
char buf [32]; |
95 |
while (read (respipe [0], buf, 32) > 0) |
96 |
; |
97 |
} |
98 |
|
99 |
req = ress; |
100 |
ress = rese = 0; |
101 |
|
102 |
pthread_mutex_unlock (&reslock); |
103 |
|
104 |
while (req) |
105 |
{ |
106 |
nreqs--; |
107 |
|
108 |
if (req->type == REQ_QUIT) |
109 |
started--; |
110 |
else |
111 |
{ |
112 |
int errorno = errno; |
113 |
errno = req->errorno; |
114 |
|
115 |
if (req->type == REQ_READ) |
116 |
SvCUR_set (req->data, req->dataoffset |
117 |
+ req->result > 0 ? req->result : 0); |
118 |
|
119 |
if (req->data) |
120 |
SvREFCNT_dec (req->data); |
121 |
|
122 |
if (req->fh) |
123 |
SvREFCNT_dec (req->fh); |
124 |
|
125 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
126 |
{ |
127 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
128 |
PL_laststatval = req->result; |
129 |
PL_statcache = *(req->statdata); |
130 |
|
131 |
Safefree (req->statdata); |
132 |
} |
133 |
|
134 |
ENTER; |
135 |
PUSHMARK (SP); |
136 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
137 |
|
138 |
if (req->type == REQ_OPEN) |
139 |
{ |
140 |
/* convert fd to fh */ |
141 |
SV *fh; |
142 |
|
143 |
PUTBACK; |
144 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
145 |
SPAGAIN; |
146 |
|
147 |
fh = SvREFCNT_inc (POPs); |
148 |
|
149 |
PUSHMARK (SP); |
150 |
XPUSHs (sv_2mortal (fh)); |
151 |
} |
152 |
|
153 |
if (SvOK (req->callback)) |
154 |
{ |
155 |
PUTBACK; |
156 |
call_sv (req->callback, G_VOID | G_EVAL); |
157 |
SPAGAIN; |
158 |
} |
159 |
|
160 |
LEAVE; |
161 |
|
162 |
if (req->callback) |
163 |
SvREFCNT_dec (req->callback); |
164 |
|
165 |
errno = errorno; |
166 |
count++; |
167 |
} |
168 |
|
169 |
prv = req; |
170 |
req = req->next; |
171 |
Safefree (prv); |
172 |
|
173 |
/* TODO: croak on errors? */ |
174 |
} |
175 |
|
176 |
return count; |
177 |
} |
178 |
|
179 |
static void *aio_proc(void *arg); |
180 |
|
181 |
static void |
182 |
start_thread (void) |
183 |
{ |
184 |
sigset_t fullsigset, oldsigset; |
185 |
pthread_t tid; |
186 |
pthread_attr_t attr; |
187 |
|
188 |
pthread_attr_init (&attr); |
189 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
190 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
191 |
|
192 |
sigfillset (&fullsigset); |
193 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
194 |
|
195 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
196 |
started++; |
197 |
|
198 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
199 |
} |
200 |
|
201 |
static void |
202 |
send_req (aio_req req) |
203 |
{ |
204 |
nreqs++; |
205 |
|
206 |
pthread_mutex_lock (&reqlock); |
207 |
|
208 |
req->next = 0; |
209 |
|
210 |
if (reqe) |
211 |
{ |
212 |
reqe->next = req; |
213 |
reqe = req; |
214 |
} |
215 |
else |
216 |
reqe = reqs = req; |
217 |
|
218 |
pthread_cond_signal (&reqwait); |
219 |
pthread_mutex_unlock (&reqlock); |
220 |
|
221 |
while (nreqs > max_outstanding) |
222 |
{ |
223 |
poll_wait (); |
224 |
poll_cb (); |
225 |
} |
226 |
} |
227 |
|
228 |
static void |
229 |
end_thread (void) |
230 |
{ |
231 |
aio_req req; |
232 |
New (0, req, 1, aio_cb); |
233 |
req->type = REQ_QUIT; |
234 |
|
235 |
send_req (req); |
236 |
} |
237 |
|
238 |
/* work around various missing functions */ |
239 |
|
240 |
#if !HAVE_PREADWRITE |
241 |
# define pread aio_pread |
242 |
# define pwrite aio_pwrite |
243 |
|
244 |
/* |
245 |
* make our pread/pwrite safe against themselves, but not against |
246 |
* normal read/write by using a mutex. slows down execution a lot, |
247 |
* but that's your problem, not mine. |
248 |
*/ |
249 |
static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
250 |
|
251 |
static ssize_t |
252 |
pread (int fd, void *buf, size_t count, off_t offset) |
253 |
{ |
254 |
ssize_t res; |
255 |
off_t ooffset; |
256 |
|
257 |
pthread_mutex_lock (&iolock); |
258 |
ooffset = lseek (fd, 0, SEEK_CUR); |
259 |
lseek (fd, offset, SEEK_SET); |
260 |
res = read (fd, buf, count); |
261 |
lseek (fd, ooffset, SEEK_SET); |
262 |
pthread_mutex_unlock (&iolock); |
263 |
|
264 |
return res; |
265 |
} |
266 |
|
267 |
static ssize_t |
268 |
pwrite (int fd, void *buf, size_t count, off_t offset) |
269 |
{ |
270 |
ssize_t res; |
271 |
off_t ooffset; |
272 |
|
273 |
pthread_mutex_lock (&iolock); |
274 |
ooffset = lseek (fd, 0, SEEK_CUR); |
275 |
lseek (fd, offset, SEEK_SET); |
276 |
res = write (fd, buf, count); |
277 |
lseek (fd, offset, SEEK_SET); |
278 |
pthread_mutex_unlock (&iolock); |
279 |
|
280 |
return res; |
281 |
} |
282 |
#endif |
283 |
|
284 |
#if !HAVE_FDATASYNC |
285 |
# define fdatasync fsync |
286 |
#endif |
287 |
|
288 |
#if !HAVE_READAHEAD |
289 |
# define readahead aio_readahead |
290 |
|
291 |
static char readahead_buf[4096]; |
292 |
|
293 |
static ssize_t |
294 |
readahead (int fd, off_t offset, size_t count) |
295 |
{ |
296 |
while (count > 0) |
297 |
{ |
298 |
size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
299 |
|
300 |
pread (fd, readahead_buf, len, offset); |
301 |
offset += len; |
302 |
count -= len; |
303 |
} |
304 |
|
305 |
errno = 0; |
306 |
} |
307 |
#endif |
308 |
|
309 |
static void * |
310 |
aio_proc (void *thr_arg) |
311 |
{ |
312 |
aio_req req; |
313 |
int type; |
314 |
|
315 |
do |
316 |
{ |
317 |
pthread_mutex_lock (&reqlock); |
318 |
|
319 |
for (;;) |
320 |
{ |
321 |
req = reqs; |
322 |
|
323 |
if (reqs) |
324 |
{ |
325 |
reqs = reqs->next; |
326 |
if (!reqs) reqe = 0; |
327 |
} |
328 |
|
329 |
if (req) |
330 |
break; |
331 |
|
332 |
pthread_cond_wait (&reqwait, &reqlock); |
333 |
} |
334 |
|
335 |
pthread_mutex_unlock (&reqlock); |
336 |
|
337 |
errno = 0; /* strictly unnecessary */ |
338 |
|
339 |
type = req->type; |
340 |
|
341 |
switch (type) |
342 |
{ |
343 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
344 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
345 |
|
346 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
347 |
|
348 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
349 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
350 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
351 |
|
352 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
353 |
case REQ_CLOSE: req->result = close (req->fd); break; |
354 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
355 |
|
356 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
357 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
358 |
|
359 |
case REQ_QUIT: |
360 |
break; |
361 |
|
362 |
default: |
363 |
req->result = ENOSYS; |
364 |
break; |
365 |
} |
366 |
|
367 |
req->errorno = errno; |
368 |
|
369 |
pthread_mutex_lock (&reslock); |
370 |
|
371 |
req->next = 0; |
372 |
|
373 |
if (rese) |
374 |
{ |
375 |
rese->next = req; |
376 |
rese = req; |
377 |
} |
378 |
else |
379 |
{ |
380 |
rese = ress = req; |
381 |
|
382 |
/* write a dummy byte to the pipe so fh becomes ready */ |
383 |
write (respipe [1], &respipe, 1); |
384 |
} |
385 |
|
386 |
pthread_mutex_unlock (&reslock); |
387 |
} |
388 |
while (type != REQ_QUIT); |
389 |
|
390 |
return 0; |
391 |
} |
392 |
|
393 |
MODULE = IO::AIO PACKAGE = IO::AIO |
394 |
|
395 |
PROTOTYPES: ENABLE |
396 |
|
397 |
BOOT: |
398 |
{ |
399 |
if (pipe (respipe)) |
400 |
croak ("unable to initialize result pipe"); |
401 |
|
402 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
403 |
croak ("cannot set result pipe to nonblocking mode"); |
404 |
|
405 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
406 |
croak ("cannot set result pipe to nonblocking mode"); |
407 |
} |
408 |
|
409 |
void |
410 |
min_parallel(nthreads) |
411 |
int nthreads |
412 |
PROTOTYPE: $ |
413 |
CODE: |
414 |
while (nthreads > started) |
415 |
start_thread (); |
416 |
|
417 |
void |
418 |
max_parallel(nthreads) |
419 |
int nthreads |
420 |
PROTOTYPE: $ |
421 |
CODE: |
422 |
{ |
423 |
int cur = started; |
424 |
while (cur > nthreads) |
425 |
{ |
426 |
end_thread (); |
427 |
cur--; |
428 |
} |
429 |
|
430 |
while (started > nthreads) |
431 |
{ |
432 |
poll_wait (); |
433 |
poll_cb (); |
434 |
} |
435 |
} |
436 |
|
437 |
int |
438 |
max_outstanding(nreqs) |
439 |
int nreqs |
440 |
PROTOTYPE: $ |
441 |
CODE: |
442 |
RETVAL = max_outstanding; |
443 |
max_outstanding = nreqs; |
444 |
|
445 |
void |
446 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
447 |
SV * pathname |
448 |
int flags |
449 |
int mode |
450 |
SV * callback |
451 |
PROTOTYPE: $$$;$ |
452 |
CODE: |
453 |
{ |
454 |
aio_req req; |
455 |
|
456 |
Newz (0, req, 1, aio_cb); |
457 |
|
458 |
if (!req) |
459 |
croak ("out of memory during aio_req allocation"); |
460 |
|
461 |
req->type = REQ_OPEN; |
462 |
req->data = newSVsv (pathname); |
463 |
req->dataptr = SvPV_nolen (req->data); |
464 |
req->fd = flags; |
465 |
req->mode = mode; |
466 |
req->callback = SvREFCNT_inc (callback); |
467 |
|
468 |
send_req (req); |
469 |
} |
470 |
|
471 |
void |
472 |
aio_close(fh,callback=&PL_sv_undef) |
473 |
SV * fh |
474 |
SV * callback |
475 |
PROTOTYPE: $;$ |
476 |
ALIAS: |
477 |
aio_close = REQ_CLOSE |
478 |
aio_fsync = REQ_FSYNC |
479 |
aio_fdatasync = REQ_FDATASYNC |
480 |
CODE: |
481 |
{ |
482 |
aio_req req; |
483 |
|
484 |
Newz (0, req, 1, aio_cb); |
485 |
|
486 |
if (!req) |
487 |
croak ("out of memory during aio_req allocation"); |
488 |
|
489 |
req->type = ix; |
490 |
req->fh = newSVsv (fh); |
491 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
492 |
req->callback = SvREFCNT_inc (callback); |
493 |
|
494 |
send_req (req); |
495 |
} |
496 |
|
497 |
void |
498 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
499 |
SV * fh |
500 |
UV offset |
501 |
IV length |
502 |
SV * data |
503 |
IV dataoffset |
504 |
SV * callback |
505 |
ALIAS: |
506 |
aio_read = REQ_READ |
507 |
aio_write = REQ_WRITE |
508 |
PROTOTYPE: $$$$$;$ |
509 |
CODE: |
510 |
{ |
511 |
aio_req req; |
512 |
STRLEN svlen; |
513 |
char *svptr = SvPVbyte (data, svlen); |
514 |
|
515 |
SvUPGRADE (data, SVt_PV); |
516 |
SvPOK_on (data); |
517 |
|
518 |
if (dataoffset < 0) |
519 |
dataoffset += svlen; |
520 |
|
521 |
if (dataoffset < 0 || dataoffset > svlen) |
522 |
croak ("data offset outside of string"); |
523 |
|
524 |
if (ix == REQ_WRITE) |
525 |
{ |
526 |
/* write: check length and adjust. */ |
527 |
if (length < 0 || length + dataoffset > svlen) |
528 |
length = svlen - dataoffset; |
529 |
} |
530 |
else |
531 |
{ |
532 |
/* read: grow scalar as necessary */ |
533 |
svptr = SvGROW (data, length + dataoffset); |
534 |
} |
535 |
|
536 |
if (length < 0) |
537 |
croak ("length must not be negative"); |
538 |
|
539 |
Newz (0, req, 1, aio_cb); |
540 |
|
541 |
if (!req) |
542 |
croak ("out of memory during aio_req allocation"); |
543 |
|
544 |
req->type = ix; |
545 |
req->fh = newSVsv (fh); |
546 |
req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) |
547 |
: IoOFP (sv_2io (fh))); |
548 |
req->offset = offset; |
549 |
req->length = length; |
550 |
req->data = SvREFCNT_inc (data); |
551 |
req->dataptr = (char *)svptr + dataoffset; |
552 |
req->callback = SvREFCNT_inc (callback); |
553 |
|
554 |
send_req (req); |
555 |
} |
556 |
|
557 |
void |
558 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
559 |
SV * fh |
560 |
UV offset |
561 |
IV length |
562 |
SV * callback |
563 |
PROTOTYPE: $$$;$ |
564 |
CODE: |
565 |
{ |
566 |
aio_req req; |
567 |
|
568 |
if (length < 0) |
569 |
croak ("length must not be negative"); |
570 |
|
571 |
Newz (0, req, 1, aio_cb); |
572 |
|
573 |
if (!req) |
574 |
croak ("out of memory during aio_req allocation"); |
575 |
|
576 |
req->type = REQ_READAHEAD; |
577 |
req->fh = newSVsv (fh); |
578 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
579 |
req->offset = offset; |
580 |
req->length = length; |
581 |
req->callback = SvREFCNT_inc (callback); |
582 |
|
583 |
send_req (req); |
584 |
} |
585 |
|
586 |
void |
587 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
588 |
SV * fh_or_path |
589 |
SV * callback |
590 |
ALIAS: |
591 |
aio_stat = REQ_STAT |
592 |
aio_lstat = REQ_LSTAT |
593 |
CODE: |
594 |
{ |
595 |
aio_req req; |
596 |
|
597 |
Newz (0, req, 1, aio_cb); |
598 |
|
599 |
if (!req) |
600 |
croak ("out of memory during aio_req allocation"); |
601 |
|
602 |
New (0, req->statdata, 1, Stat_t); |
603 |
|
604 |
if (!req->statdata) |
605 |
croak ("out of memory during aio_req->statdata allocation"); |
606 |
|
607 |
if (SvPOK (fh_or_path)) |
608 |
{ |
609 |
req->type = ix; |
610 |
req->data = newSVsv (fh_or_path); |
611 |
req->dataptr = SvPV_nolen (req->data); |
612 |
} |
613 |
else |
614 |
{ |
615 |
req->type = REQ_FSTAT; |
616 |
req->fh = newSVsv (fh_or_path); |
617 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
618 |
} |
619 |
|
620 |
req->callback = SvREFCNT_inc (callback); |
621 |
|
622 |
send_req (req); |
623 |
} |
624 |
|
625 |
void |
626 |
aio_unlink(pathname,callback=&PL_sv_undef) |
627 |
SV * pathname |
628 |
SV * callback |
629 |
CODE: |
630 |
{ |
631 |
aio_req req; |
632 |
|
633 |
Newz (0, req, 1, aio_cb); |
634 |
|
635 |
if (!req) |
636 |
croak ("out of memory during aio_req allocation"); |
637 |
|
638 |
req->type = REQ_UNLINK; |
639 |
req->data = newSVsv (pathname); |
640 |
req->dataptr = SvPV_nolen (req->data); |
641 |
req->callback = SvREFCNT_inc (callback); |
642 |
|
643 |
send_req (req); |
644 |
} |
645 |
|
646 |
void |
647 |
flush() |
648 |
PROTOTYPE: |
649 |
CODE: |
650 |
while (nreqs) |
651 |
{ |
652 |
poll_wait (); |
653 |
poll_cb (); |
654 |
} |
655 |
|
656 |
void |
657 |
poll() |
658 |
PROTOTYPE: |
659 |
CODE: |
660 |
if (nreqs) |
661 |
{ |
662 |
poll_wait (); |
663 |
poll_cb (); |
664 |
} |
665 |
|
666 |
int |
667 |
poll_fileno() |
668 |
PROTOTYPE: |
669 |
CODE: |
670 |
RETVAL = respipe [0]; |
671 |
OUTPUT: |
672 |
RETVAL |
673 |
|
674 |
int |
675 |
poll_cb(...) |
676 |
PROTOTYPE: |
677 |
CODE: |
678 |
RETVAL = poll_cb (); |
679 |
OUTPUT: |
680 |
RETVAL |
681 |
|
682 |
void |
683 |
poll_wait() |
684 |
PROTOTYPE: |
685 |
CODE: |
686 |
if (nreqs) |
687 |
poll_wait (); |
688 |
|
689 |
int |
690 |
nreqs() |
691 |
PROTOTYPE: |
692 |
CODE: |
693 |
RETVAL = nreqs; |
694 |
OUTPUT: |
695 |
RETVAL |
696 |
|