1 |
#define _XOPEN_SOURCE 500 |
2 |
|
3 |
#include "EXTERN.h" |
4 |
#include "perl.h" |
5 |
#include "XSUB.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 |
#if __linux |
15 |
#include <sys/syscall.h> |
16 |
#endif |
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; |
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->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 |
PUSHMARK (SP); |
132 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
133 |
|
134 |
if (req->type == REQ_OPEN) |
135 |
{ |
136 |
/* convert fd to fh */ |
137 |
SV *fh; |
138 |
|
139 |
PUTBACK; |
140 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
141 |
SPAGAIN; |
142 |
|
143 |
fh = POPs; |
144 |
|
145 |
PUSHMARK (SP); |
146 |
XPUSHs (fh); |
147 |
} |
148 |
|
149 |
if (SvOK (req->callback)) |
150 |
{ |
151 |
PUTBACK; |
152 |
call_sv (req->callback, G_VOID | G_EVAL); |
153 |
SPAGAIN; |
154 |
} |
155 |
|
156 |
if (req->callback) |
157 |
SvREFCNT_dec (req->callback); |
158 |
|
159 |
errno = errorno; |
160 |
count++; |
161 |
} |
162 |
|
163 |
prv = req; |
164 |
req = req->next; |
165 |
Safefree (prv); |
166 |
|
167 |
/* TODO: croak on errors? */ |
168 |
} |
169 |
|
170 |
return count; |
171 |
} |
172 |
|
173 |
static void *aio_proc(void *arg); |
174 |
|
175 |
static void |
176 |
start_thread (void) |
177 |
{ |
178 |
sigset_t fullsigset, oldsigset; |
179 |
pthread_t tid; |
180 |
pthread_attr_t attr; |
181 |
|
182 |
pthread_attr_init (&attr); |
183 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
184 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
185 |
|
186 |
sigfillset (&fullsigset); |
187 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
188 |
|
189 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
190 |
started++; |
191 |
|
192 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
193 |
} |
194 |
|
195 |
static void |
196 |
send_req (aio_req req) |
197 |
{ |
198 |
nreqs++; |
199 |
|
200 |
pthread_mutex_lock (&reqlock); |
201 |
|
202 |
req->next = 0; |
203 |
|
204 |
if (reqe) |
205 |
{ |
206 |
reqe->next = req; |
207 |
reqe = req; |
208 |
} |
209 |
else |
210 |
reqe = reqs = req; |
211 |
|
212 |
pthread_cond_signal (&reqwait); |
213 |
pthread_mutex_unlock (&reqlock); |
214 |
|
215 |
while (nreqs > max_outstanding) |
216 |
{ |
217 |
poll_wait (); |
218 |
poll_cb (); |
219 |
} |
220 |
} |
221 |
|
222 |
static void |
223 |
end_thread (void) |
224 |
{ |
225 |
aio_req req; |
226 |
New (0, req, 1, aio_cb); |
227 |
req->type = REQ_QUIT; |
228 |
|
229 |
send_req (req); |
230 |
} |
231 |
|
232 |
static void |
233 |
read_write (int dowrite, int fd, off_t offset, size_t length, |
234 |
SV *data, STRLEN dataoffset, SV *callback) |
235 |
{ |
236 |
aio_req req; |
237 |
STRLEN svlen; |
238 |
char *svptr = SvPV (data, svlen); |
239 |
|
240 |
SvUPGRADE (data, SVt_PV); |
241 |
SvPOK_on (data); |
242 |
|
243 |
if (dataoffset < 0) |
244 |
dataoffset += svlen; |
245 |
|
246 |
if (dataoffset < 0 || dataoffset > svlen) |
247 |
croak ("data offset outside of string"); |
248 |
|
249 |
if (dowrite) |
250 |
{ |
251 |
/* write: check length and adjust. */ |
252 |
if (length < 0 || length + dataoffset > svlen) |
253 |
length = svlen - dataoffset; |
254 |
} |
255 |
else |
256 |
{ |
257 |
/* read: grow scalar as necessary */ |
258 |
svptr = SvGROW (data, length + dataoffset); |
259 |
} |
260 |
|
261 |
if (length < 0) |
262 |
croak ("length must not be negative"); |
263 |
|
264 |
Newz (0, req, 1, aio_cb); |
265 |
|
266 |
if (!req) |
267 |
croak ("out of memory during aio_req allocation"); |
268 |
|
269 |
req->type = dowrite ? REQ_WRITE : REQ_READ; |
270 |
req->fd = fd; |
271 |
req->offset = offset; |
272 |
req->length = length; |
273 |
req->data = SvREFCNT_inc (data); |
274 |
req->dataptr = (char *)svptr + dataoffset; |
275 |
req->callback = SvREFCNT_inc (callback); |
276 |
|
277 |
send_req (req); |
278 |
} |
279 |
|
280 |
static void * |
281 |
aio_proc (void *thr_arg) |
282 |
{ |
283 |
aio_req req; |
284 |
int type; |
285 |
|
286 |
do |
287 |
{ |
288 |
pthread_mutex_lock (&reqlock); |
289 |
|
290 |
for (;;) |
291 |
{ |
292 |
req = reqs; |
293 |
|
294 |
if (reqs) |
295 |
{ |
296 |
reqs = reqs->next; |
297 |
if (!reqs) reqe = 0; |
298 |
} |
299 |
|
300 |
if (req) |
301 |
break; |
302 |
|
303 |
pthread_cond_wait (&reqwait, &reqlock); |
304 |
} |
305 |
|
306 |
pthread_mutex_unlock (&reqlock); |
307 |
|
308 |
errno = 0; /* strictly unnecessary */ |
309 |
|
310 |
type = req->type; |
311 |
|
312 |
switch (type) |
313 |
{ |
314 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
315 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
316 |
#if SYS_readahead |
317 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
318 |
#else |
319 |
case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break; |
320 |
#endif |
321 |
|
322 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
323 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
324 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
325 |
|
326 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
327 |
case REQ_CLOSE: req->result = close (req->fd); break; |
328 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
329 |
|
330 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
331 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
332 |
|
333 |
case REQ_QUIT: |
334 |
break; |
335 |
|
336 |
default: |
337 |
req->result = ENOSYS; |
338 |
break; |
339 |
} |
340 |
|
341 |
req->errorno = errno; |
342 |
|
343 |
pthread_mutex_lock (&reslock); |
344 |
|
345 |
req->next = 0; |
346 |
|
347 |
if (rese) |
348 |
{ |
349 |
rese->next = req; |
350 |
rese = req; |
351 |
} |
352 |
else |
353 |
{ |
354 |
rese = ress = req; |
355 |
|
356 |
/* write a dummy byte to the pipe so fh becomes ready */ |
357 |
write (respipe [1], &respipe, 1); |
358 |
} |
359 |
|
360 |
pthread_mutex_unlock (&reslock); |
361 |
} |
362 |
while (type != REQ_QUIT); |
363 |
|
364 |
return 0; |
365 |
} |
366 |
|
367 |
MODULE = IO::AIO PACKAGE = IO::AIO |
368 |
|
369 |
PROTOTYPES: ENABLE |
370 |
|
371 |
BOOT: |
372 |
{ |
373 |
if (pipe (respipe)) |
374 |
croak ("unable to initialize result pipe"); |
375 |
|
376 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
377 |
croak ("cannot set result pipe to nonblocking mode"); |
378 |
|
379 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
380 |
croak ("cannot set result pipe to nonblocking mode"); |
381 |
} |
382 |
|
383 |
void |
384 |
min_parallel(nthreads) |
385 |
int nthreads |
386 |
PROTOTYPE: $ |
387 |
CODE: |
388 |
while (nthreads > started) |
389 |
start_thread (); |
390 |
|
391 |
void |
392 |
max_parallel(nthreads) |
393 |
int nthreads |
394 |
PROTOTYPE: $ |
395 |
CODE: |
396 |
{ |
397 |
int cur = started; |
398 |
while (cur > nthreads) |
399 |
{ |
400 |
end_thread (); |
401 |
cur--; |
402 |
} |
403 |
|
404 |
while (started > nthreads) |
405 |
{ |
406 |
poll_wait (); |
407 |
poll_cb (); |
408 |
} |
409 |
} |
410 |
|
411 |
int |
412 |
max_outstanding(nreqs) |
413 |
int nreqs |
414 |
PROTOTYPE: $ |
415 |
CODE: |
416 |
RETVAL = max_outstanding; |
417 |
max_outstanding = nreqs; |
418 |
|
419 |
void |
420 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
421 |
SV * pathname |
422 |
int flags |
423 |
int mode |
424 |
SV * callback |
425 |
PROTOTYPE: $$$;$ |
426 |
CODE: |
427 |
{ |
428 |
aio_req req; |
429 |
|
430 |
Newz (0, req, 1, aio_cb); |
431 |
|
432 |
if (!req) |
433 |
croak ("out of memory during aio_req allocation"); |
434 |
|
435 |
req->type = REQ_OPEN; |
436 |
req->data = newSVsv (pathname); |
437 |
req->dataptr = SvPV_nolen (req->data); |
438 |
req->fd = flags; |
439 |
req->mode = mode; |
440 |
req->callback = SvREFCNT_inc (callback); |
441 |
|
442 |
send_req (req); |
443 |
} |
444 |
|
445 |
void |
446 |
aio_close(fh,callback=&PL_sv_undef) |
447 |
InputStream fh |
448 |
SV * callback |
449 |
PROTOTYPE: $;$ |
450 |
ALIAS: |
451 |
aio_close = REQ_CLOSE |
452 |
aio_fsync = REQ_FSYNC |
453 |
aio_fdatasync = REQ_FDATASYNC |
454 |
CODE: |
455 |
{ |
456 |
aio_req req; |
457 |
|
458 |
Newz (0, req, 1, aio_cb); |
459 |
|
460 |
if (!req) |
461 |
croak ("out of memory during aio_req allocation"); |
462 |
|
463 |
req->type = ix; |
464 |
req->fd = PerlIO_fileno (fh); |
465 |
req->callback = SvREFCNT_inc (callback); |
466 |
|
467 |
send_req (req); |
468 |
} |
469 |
|
470 |
void |
471 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
472 |
InputStream fh |
473 |
UV offset |
474 |
IV length |
475 |
SV * data |
476 |
IV dataoffset |
477 |
SV * callback |
478 |
PROTOTYPE: $$$$$;$ |
479 |
CODE: |
480 |
read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
481 |
|
482 |
void |
483 |
aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
484 |
OutputStream fh |
485 |
UV offset |
486 |
IV length |
487 |
SV * data |
488 |
IV dataoffset |
489 |
SV * callback |
490 |
PROTOTYPE: $$$$$;$ |
491 |
CODE: |
492 |
read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
493 |
|
494 |
void |
495 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
496 |
InputStream fh |
497 |
UV offset |
498 |
IV length |
499 |
SV * callback |
500 |
PROTOTYPE: $$$;$ |
501 |
CODE: |
502 |
{ |
503 |
aio_req req; |
504 |
|
505 |
if (length < 0) |
506 |
croak ("length must not be negative"); |
507 |
|
508 |
Newz (0, req, 1, aio_cb); |
509 |
|
510 |
if (!req) |
511 |
croak ("out of memory during aio_req allocation"); |
512 |
|
513 |
req->type = REQ_READAHEAD; |
514 |
req->fd = PerlIO_fileno (fh); |
515 |
req->offset = offset; |
516 |
req->length = length; |
517 |
req->callback = SvREFCNT_inc (callback); |
518 |
|
519 |
send_req (req); |
520 |
} |
521 |
|
522 |
void |
523 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
524 |
SV * fh_or_path |
525 |
SV * callback |
526 |
ALIAS: |
527 |
aio_stat = REQ_STAT |
528 |
aio_lstat = REQ_LSTAT |
529 |
CODE: |
530 |
{ |
531 |
aio_req req; |
532 |
|
533 |
Newz (0, req, 1, aio_cb); |
534 |
|
535 |
if (!req) |
536 |
croak ("out of memory during aio_req allocation"); |
537 |
|
538 |
New (0, req->statdata, 1, Stat_t); |
539 |
|
540 |
if (!req->statdata) |
541 |
croak ("out of memory during aio_req->statdata allocation"); |
542 |
|
543 |
if (SvPOK (fh_or_path)) |
544 |
{ |
545 |
req->type = ix; |
546 |
req->data = newSVsv (fh_or_path); |
547 |
req->dataptr = SvPV_nolen (req->data); |
548 |
} |
549 |
else |
550 |
{ |
551 |
req->type = REQ_FSTAT; |
552 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
553 |
} |
554 |
|
555 |
req->callback = SvREFCNT_inc (callback); |
556 |
|
557 |
send_req (req); |
558 |
} |
559 |
|
560 |
void |
561 |
aio_unlink(pathname,callback=&PL_sv_undef) |
562 |
SV * pathname |
563 |
SV * callback |
564 |
CODE: |
565 |
{ |
566 |
aio_req req; |
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_UNLINK; |
574 |
req->data = newSVsv (pathname); |
575 |
req->dataptr = SvPV_nolen (req->data); |
576 |
req->callback = SvREFCNT_inc (callback); |
577 |
|
578 |
send_req (req); |
579 |
} |
580 |
|
581 |
void |
582 |
flush() |
583 |
PROTOTYPE: |
584 |
CODE: |
585 |
while (nreqs) |
586 |
{ |
587 |
poll_wait (); |
588 |
poll_cb (); |
589 |
} |
590 |
|
591 |
void |
592 |
poll() |
593 |
PROTOTYPE: |
594 |
CODE: |
595 |
if (nreqs) |
596 |
{ |
597 |
poll_wait (); |
598 |
poll_cb (); |
599 |
} |
600 |
|
601 |
int |
602 |
poll_fileno() |
603 |
PROTOTYPE: |
604 |
CODE: |
605 |
RETVAL = respipe [0]; |
606 |
OUTPUT: |
607 |
RETVAL |
608 |
|
609 |
int |
610 |
poll_cb(...) |
611 |
PROTOTYPE: |
612 |
CODE: |
613 |
RETVAL = poll_cb (); |
614 |
OUTPUT: |
615 |
RETVAL |
616 |
|
617 |
void |
618 |
poll_wait() |
619 |
PROTOTYPE: |
620 |
CODE: |
621 |
if (nreqs) |
622 |
poll_wait (); |
623 |
|
624 |
int |
625 |
nreqs() |
626 |
PROTOTYPE: |
627 |
CODE: |
628 |
RETVAL = nreqs; |
629 |
OUTPUT: |
630 |
RETVAL |
631 |
|