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, |
35 |
REQ_FSYNC, REQ_FDATASYNC, |
36 |
REQ_UNLINK, REQ_RMDIR, |
37 |
REQ_SYMLINK, |
38 |
}; |
39 |
|
40 |
typedef struct aio_cb { |
41 |
struct aio_cb *volatile next; |
42 |
|
43 |
int type; |
44 |
|
45 |
int fd; |
46 |
off_t offset; |
47 |
size_t length; |
48 |
ssize_t result; |
49 |
mode_t mode; /* open */ |
50 |
int errorno; |
51 |
SV *data, *callback, *fh; |
52 |
void *dataptr, *data2ptr; |
53 |
STRLEN dataoffset; |
54 |
|
55 |
Stat_t *statdata; |
56 |
} aio_cb; |
57 |
|
58 |
typedef aio_cb *aio_req; |
59 |
|
60 |
static int started; |
61 |
static volatile int nreqs; |
62 |
static int max_outstanding = 1<<30; |
63 |
static int respipe [2]; |
64 |
|
65 |
static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; |
66 |
static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER; |
67 |
static pthread_mutex_t frklock = PTHREAD_MUTEX_INITIALIZER; |
68 |
static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER; |
69 |
|
70 |
static volatile aio_req reqs, reqe; /* queue start, queue end */ |
71 |
static volatile aio_req ress, rese; /* queue start, queue end */ |
72 |
|
73 |
static void free_req (aio_req req) |
74 |
{ |
75 |
if (req->data) |
76 |
SvREFCNT_dec (req->data); |
77 |
|
78 |
if (req->fh) |
79 |
SvREFCNT_dec (req->fh); |
80 |
|
81 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
82 |
Safefree (req->statdata); |
83 |
|
84 |
if (req->callback) |
85 |
SvREFCNT_dec (req->callback); |
86 |
|
87 |
Safefree (req); |
88 |
} |
89 |
|
90 |
static void |
91 |
poll_wait () |
92 |
{ |
93 |
if (nreqs && !ress) |
94 |
{ |
95 |
fd_set rfd; |
96 |
FD_ZERO(&rfd); |
97 |
FD_SET(respipe [0], &rfd); |
98 |
|
99 |
select (respipe [0] + 1, &rfd, 0, 0, 0); |
100 |
} |
101 |
} |
102 |
|
103 |
static int |
104 |
poll_cb () |
105 |
{ |
106 |
dSP; |
107 |
int count = 0; |
108 |
int do_croak = 0; |
109 |
aio_req req, prv; |
110 |
|
111 |
pthread_mutex_lock (&reslock); |
112 |
|
113 |
{ |
114 |
/* read any signals sent by the worker threads */ |
115 |
char buf [32]; |
116 |
while (read (respipe [0], buf, 32) == 32) |
117 |
; |
118 |
} |
119 |
|
120 |
req = ress; |
121 |
ress = rese = 0; |
122 |
|
123 |
pthread_mutex_unlock (&reslock); |
124 |
|
125 |
while (req) |
126 |
{ |
127 |
nreqs--; |
128 |
|
129 |
if (req->type == REQ_QUIT) |
130 |
started--; |
131 |
else |
132 |
{ |
133 |
int errorno = errno; |
134 |
errno = req->errorno; |
135 |
|
136 |
if (req->type == REQ_READ) |
137 |
SvCUR_set (req->data, req->dataoffset |
138 |
+ req->result > 0 ? req->result : 0); |
139 |
|
140 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
141 |
{ |
142 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
143 |
PL_laststatval = req->result; |
144 |
PL_statcache = *(req->statdata); |
145 |
} |
146 |
|
147 |
ENTER; |
148 |
PUSHMARK (SP); |
149 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
150 |
|
151 |
if (req->type == REQ_OPEN) |
152 |
{ |
153 |
/* convert fd to fh */ |
154 |
SV *fh; |
155 |
|
156 |
PUTBACK; |
157 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
158 |
SPAGAIN; |
159 |
|
160 |
fh = SvREFCNT_inc (POPs); |
161 |
|
162 |
PUSHMARK (SP); |
163 |
XPUSHs (sv_2mortal (fh)); |
164 |
} |
165 |
|
166 |
if (SvOK (req->callback)) |
167 |
{ |
168 |
PUTBACK; |
169 |
call_sv (req->callback, G_VOID | G_EVAL); |
170 |
SPAGAIN; |
171 |
} |
172 |
|
173 |
LEAVE; |
174 |
|
175 |
do_croak = SvTRUE (ERRSV); |
176 |
|
177 |
errno = errorno; |
178 |
count++; |
179 |
} |
180 |
|
181 |
prv = req; |
182 |
req = req->next; |
183 |
free_req (prv); |
184 |
|
185 |
if (do_croak) |
186 |
croak (0); |
187 |
} |
188 |
|
189 |
return count; |
190 |
} |
191 |
|
192 |
static void *aio_proc(void *arg); |
193 |
|
194 |
static void |
195 |
start_thread (void) |
196 |
{ |
197 |
sigset_t fullsigset, oldsigset; |
198 |
pthread_t tid; |
199 |
pthread_attr_t attr; |
200 |
|
201 |
pthread_attr_init (&attr); |
202 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
203 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
204 |
|
205 |
sigfillset (&fullsigset); |
206 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
207 |
|
208 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
209 |
started++; |
210 |
|
211 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
212 |
} |
213 |
|
214 |
static void |
215 |
send_req (aio_req req) |
216 |
{ |
217 |
nreqs++; |
218 |
|
219 |
pthread_mutex_lock (&reqlock); |
220 |
|
221 |
req->next = 0; |
222 |
|
223 |
if (reqe) |
224 |
{ |
225 |
reqe->next = req; |
226 |
reqe = req; |
227 |
} |
228 |
else |
229 |
reqe = reqs = req; |
230 |
|
231 |
pthread_cond_signal (&reqwait); |
232 |
pthread_mutex_unlock (&reqlock); |
233 |
|
234 |
while (nreqs > max_outstanding) |
235 |
{ |
236 |
poll_wait (); |
237 |
poll_cb (); |
238 |
} |
239 |
} |
240 |
|
241 |
static void |
242 |
end_thread (void) |
243 |
{ |
244 |
aio_req req; |
245 |
Newz (0, req, 1, aio_cb); |
246 |
req->type = REQ_QUIT; |
247 |
|
248 |
send_req (req); |
249 |
} |
250 |
|
251 |
|
252 |
static void min_parallel (int nthreads) |
253 |
{ |
254 |
while (nthreads > started) |
255 |
start_thread (); |
256 |
} |
257 |
|
258 |
static void max_parallel (int nthreads) |
259 |
{ |
260 |
int cur = started; |
261 |
while (cur > nthreads) |
262 |
{ |
263 |
end_thread (); |
264 |
cur--; |
265 |
} |
266 |
|
267 |
while (started > nthreads) |
268 |
{ |
269 |
poll_wait (); |
270 |
poll_cb (); |
271 |
} |
272 |
} |
273 |
|
274 |
static void create_pipe () |
275 |
{ |
276 |
if (pipe (respipe)) |
277 |
croak ("unable to initialize result pipe"); |
278 |
|
279 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
280 |
croak ("cannot set result pipe to nonblocking mode"); |
281 |
|
282 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
283 |
croak ("cannot set result pipe to nonblocking mode"); |
284 |
} |
285 |
|
286 |
static void atfork_prepare (void) |
287 |
{ |
288 |
pthread_mutex_lock (&frklock); |
289 |
pthread_mutex_lock (&reqlock); |
290 |
pthread_mutex_lock (&reslock); |
291 |
} |
292 |
|
293 |
static void atfork_parent (void) |
294 |
{ |
295 |
pthread_mutex_unlock (&reslock); |
296 |
pthread_mutex_unlock (&reqlock); |
297 |
pthread_mutex_unlock (&frklock); |
298 |
} |
299 |
|
300 |
static void atfork_child (void) |
301 |
{ |
302 |
int restart = started; |
303 |
started = 0; |
304 |
|
305 |
while (reqs) |
306 |
{ |
307 |
free_req (reqs); |
308 |
reqs = reqs->next; |
309 |
} |
310 |
|
311 |
reqs = reqe = 0; |
312 |
|
313 |
while (ress) |
314 |
{ |
315 |
free_req (ress); |
316 |
ress = ress->next; |
317 |
} |
318 |
|
319 |
ress = rese = 0; |
320 |
|
321 |
close (respipe [0]); |
322 |
close (respipe [1]); |
323 |
|
324 |
create_pipe (); |
325 |
|
326 |
atfork_parent (); |
327 |
|
328 |
min_parallel (restart); |
329 |
} |
330 |
|
331 |
/*****************************************************************************/ |
332 |
/* work around various missing functions */ |
333 |
|
334 |
#if !HAVE_PREADWRITE |
335 |
# define pread aio_pread |
336 |
# define pwrite aio_pwrite |
337 |
|
338 |
/* |
339 |
* make our pread/pwrite safe against themselves, but not against |
340 |
* normal read/write by using a mutex. slows down execution a lot, |
341 |
* but that's your problem, not mine. |
342 |
*/ |
343 |
static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
344 |
|
345 |
static ssize_t |
346 |
pread (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 = read (fd, buf, count); |
355 |
lseek (fd, ooffset, SEEK_SET); |
356 |
pthread_mutex_unlock (&iolock); |
357 |
|
358 |
return res; |
359 |
} |
360 |
|
361 |
static ssize_t |
362 |
pwrite (int fd, void *buf, size_t count, off_t offset) |
363 |
{ |
364 |
ssize_t res; |
365 |
off_t ooffset; |
366 |
|
367 |
pthread_mutex_lock (&iolock); |
368 |
ooffset = lseek (fd, 0, SEEK_CUR); |
369 |
lseek (fd, offset, SEEK_SET); |
370 |
res = write (fd, buf, count); |
371 |
lseek (fd, offset, SEEK_SET); |
372 |
pthread_mutex_unlock (&iolock); |
373 |
|
374 |
return res; |
375 |
} |
376 |
#endif |
377 |
|
378 |
#if !HAVE_FDATASYNC |
379 |
# define fdatasync fsync |
380 |
#endif |
381 |
|
382 |
#if !HAVE_READAHEAD |
383 |
# define readahead aio_readahead |
384 |
|
385 |
static char readahead_buf[4096]; |
386 |
|
387 |
static ssize_t |
388 |
readahead (int fd, off_t offset, size_t count) |
389 |
{ |
390 |
while (count > 0) |
391 |
{ |
392 |
size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
393 |
|
394 |
pread (fd, readahead_buf, len, offset); |
395 |
offset += len; |
396 |
count -= len; |
397 |
} |
398 |
|
399 |
errno = 0; |
400 |
} |
401 |
#endif |
402 |
|
403 |
/*****************************************************************************/ |
404 |
|
405 |
static void * |
406 |
aio_proc (void *thr_arg) |
407 |
{ |
408 |
aio_req req; |
409 |
int type; |
410 |
|
411 |
do |
412 |
{ |
413 |
pthread_mutex_lock (&reqlock); |
414 |
|
415 |
for (;;) |
416 |
{ |
417 |
req = reqs; |
418 |
|
419 |
if (reqs) |
420 |
{ |
421 |
reqs = reqs->next; |
422 |
if (!reqs) reqe = 0; |
423 |
} |
424 |
|
425 |
if (req) |
426 |
break; |
427 |
|
428 |
pthread_cond_wait (&reqwait, &reqlock); |
429 |
} |
430 |
|
431 |
pthread_mutex_unlock (&reqlock); |
432 |
|
433 |
errno = 0; /* strictly unnecessary */ |
434 |
|
435 |
type = req->type; |
436 |
|
437 |
switch (type) |
438 |
{ |
439 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
440 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
441 |
|
442 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
443 |
|
444 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
445 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
446 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
447 |
|
448 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
449 |
case REQ_CLOSE: req->result = close (req->fd); break; |
450 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
451 |
case REQ_RMDIR: req->result = rmdir (req->dataptr); break; |
452 |
case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break; |
453 |
|
454 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
455 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
456 |
|
457 |
case REQ_QUIT: |
458 |
break; |
459 |
|
460 |
default: |
461 |
req->result = ENOSYS; |
462 |
break; |
463 |
} |
464 |
|
465 |
req->errorno = errno; |
466 |
|
467 |
pthread_mutex_lock (&reslock); |
468 |
|
469 |
req->next = 0; |
470 |
|
471 |
if (rese) |
472 |
{ |
473 |
rese->next = req; |
474 |
rese = req; |
475 |
} |
476 |
else |
477 |
{ |
478 |
rese = ress = req; |
479 |
|
480 |
/* write a dummy byte to the pipe so fh becomes ready */ |
481 |
write (respipe [1], &respipe, 1); |
482 |
} |
483 |
|
484 |
pthread_mutex_unlock (&reslock); |
485 |
} |
486 |
while (type != REQ_QUIT); |
487 |
|
488 |
return 0; |
489 |
} |
490 |
|
491 |
#define dREQ \ |
492 |
aio_req req; \ |
493 |
\ |
494 |
if (SvOK (callback) && !SvROK (callback)) \ |
495 |
croak ("clalback must be undef or of reference type"); \ |
496 |
\ |
497 |
Newz (0, req, 1, aio_cb); \ |
498 |
if (!req) \ |
499 |
croak ("out of memory during aio_req allocation"); \ |
500 |
\ |
501 |
req->callback = SvREFCNT_inc (callback); |
502 |
|
503 |
MODULE = IO::AIO PACKAGE = IO::AIO |
504 |
|
505 |
PROTOTYPES: ENABLE |
506 |
|
507 |
BOOT: |
508 |
{ |
509 |
create_pipe (); |
510 |
pthread_atfork (atfork_prepare, atfork_parent, atfork_child); |
511 |
} |
512 |
|
513 |
void |
514 |
min_parallel(nthreads) |
515 |
int nthreads |
516 |
PROTOTYPE: $ |
517 |
|
518 |
void |
519 |
max_parallel(nthreads) |
520 |
int nthreads |
521 |
PROTOTYPE: $ |
522 |
|
523 |
int |
524 |
max_outstanding(nreqs) |
525 |
int nreqs |
526 |
PROTOTYPE: $ |
527 |
CODE: |
528 |
RETVAL = max_outstanding; |
529 |
max_outstanding = nreqs; |
530 |
|
531 |
void |
532 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
533 |
SV * pathname |
534 |
int flags |
535 |
int mode |
536 |
SV * callback |
537 |
PROTOTYPE: $$$;$ |
538 |
CODE: |
539 |
{ |
540 |
dREQ; |
541 |
|
542 |
req->type = REQ_OPEN; |
543 |
req->data = newSVsv (pathname); |
544 |
req->dataptr = SvPVbyte_nolen (req->data); |
545 |
req->fd = flags; |
546 |
req->mode = mode; |
547 |
|
548 |
send_req (req); |
549 |
} |
550 |
|
551 |
void |
552 |
aio_close(fh,callback=&PL_sv_undef) |
553 |
SV * fh |
554 |
SV * callback |
555 |
PROTOTYPE: $;$ |
556 |
ALIAS: |
557 |
aio_close = REQ_CLOSE |
558 |
aio_fsync = REQ_FSYNC |
559 |
aio_fdatasync = REQ_FDATASYNC |
560 |
CODE: |
561 |
{ |
562 |
dREQ; |
563 |
|
564 |
req->type = ix; |
565 |
req->fh = newSVsv (fh); |
566 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
567 |
|
568 |
send_req (req); |
569 |
} |
570 |
|
571 |
void |
572 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
573 |
SV * fh |
574 |
UV offset |
575 |
IV length |
576 |
SV * data |
577 |
IV dataoffset |
578 |
SV * callback |
579 |
ALIAS: |
580 |
aio_read = REQ_READ |
581 |
aio_write = REQ_WRITE |
582 |
PROTOTYPE: $$$$$;$ |
583 |
CODE: |
584 |
{ |
585 |
aio_req req; |
586 |
STRLEN svlen; |
587 |
char *svptr = SvPVbyte (data, svlen); |
588 |
|
589 |
SvUPGRADE (data, SVt_PV); |
590 |
SvPOK_on (data); |
591 |
|
592 |
if (dataoffset < 0) |
593 |
dataoffset += svlen; |
594 |
|
595 |
if (dataoffset < 0 || dataoffset > svlen) |
596 |
croak ("data offset outside of string"); |
597 |
|
598 |
if (ix == REQ_WRITE) |
599 |
{ |
600 |
/* write: check length and adjust. */ |
601 |
if (length < 0 || length + dataoffset > svlen) |
602 |
length = svlen - dataoffset; |
603 |
} |
604 |
else |
605 |
{ |
606 |
/* read: grow scalar as necessary */ |
607 |
svptr = SvGROW (data, length + dataoffset); |
608 |
} |
609 |
|
610 |
if (length < 0) |
611 |
croak ("length must not be negative"); |
612 |
|
613 |
{ |
614 |
dREQ; |
615 |
|
616 |
req->type = ix; |
617 |
req->fh = newSVsv (fh); |
618 |
req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) |
619 |
: IoOFP (sv_2io (fh))); |
620 |
req->offset = offset; |
621 |
req->length = length; |
622 |
req->data = SvREFCNT_inc (data); |
623 |
req->dataptr = (char *)svptr + dataoffset; |
624 |
req->callback = SvREFCNT_inc (callback); |
625 |
|
626 |
send_req (req); |
627 |
} |
628 |
} |
629 |
|
630 |
void |
631 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
632 |
SV * fh |
633 |
UV offset |
634 |
IV length |
635 |
SV * callback |
636 |
PROTOTYPE: $$$;$ |
637 |
CODE: |
638 |
{ |
639 |
dREQ; |
640 |
|
641 |
req->type = REQ_READAHEAD; |
642 |
req->fh = newSVsv (fh); |
643 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
644 |
req->offset = offset; |
645 |
req->length = length; |
646 |
|
647 |
send_req (req); |
648 |
} |
649 |
|
650 |
void |
651 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
652 |
SV * fh_or_path |
653 |
SV * callback |
654 |
ALIAS: |
655 |
aio_stat = REQ_STAT |
656 |
aio_lstat = REQ_LSTAT |
657 |
CODE: |
658 |
{ |
659 |
dREQ; |
660 |
|
661 |
New (0, req->statdata, 1, Stat_t); |
662 |
if (!req->statdata) |
663 |
croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)"); |
664 |
|
665 |
if (SvPOK (fh_or_path)) |
666 |
{ |
667 |
req->type = ix; |
668 |
req->data = newSVsv (fh_or_path); |
669 |
req->dataptr = SvPVbyte_nolen (req->data); |
670 |
} |
671 |
else |
672 |
{ |
673 |
req->type = REQ_FSTAT; |
674 |
req->fh = newSVsv (fh_or_path); |
675 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
676 |
} |
677 |
|
678 |
send_req (req); |
679 |
} |
680 |
|
681 |
void |
682 |
aio_unlink(pathname,callback=&PL_sv_undef) |
683 |
SV * pathname |
684 |
SV * callback |
685 |
ALIAS: |
686 |
aio_unlink = REQ_UNLINK |
687 |
aio_rmdir = REQ_RMDIR |
688 |
CODE: |
689 |
{ |
690 |
dREQ; |
691 |
|
692 |
req->type = ix; |
693 |
req->data = newSVsv (pathname); |
694 |
req->dataptr = SvPVbyte_nolen (req->data); |
695 |
|
696 |
send_req (req); |
697 |
} |
698 |
|
699 |
void |
700 |
aio_symlink(oldpath,newpath,callback=&PL_sv_undef) |
701 |
SV * oldpath |
702 |
SV * newpath |
703 |
SV * callback |
704 |
CODE: |
705 |
{ |
706 |
dREQ; |
707 |
|
708 |
req->type = REQ_SYMLINK; |
709 |
req->fh = newSVsv (oldpath); |
710 |
req->data2ptr = SvPVbyte_nolen (req->fh); |
711 |
req->data = newSVsv (newpath); |
712 |
req->dataptr = SvPVbyte_nolen (req->data); |
713 |
|
714 |
send_req (req); |
715 |
} |
716 |
|
717 |
void |
718 |
flush() |
719 |
PROTOTYPE: |
720 |
CODE: |
721 |
while (nreqs) |
722 |
{ |
723 |
poll_wait (); |
724 |
poll_cb (); |
725 |
} |
726 |
|
727 |
void |
728 |
poll() |
729 |
PROTOTYPE: |
730 |
CODE: |
731 |
if (nreqs) |
732 |
{ |
733 |
poll_wait (); |
734 |
poll_cb (); |
735 |
} |
736 |
|
737 |
int |
738 |
poll_fileno() |
739 |
PROTOTYPE: |
740 |
CODE: |
741 |
RETVAL = respipe [0]; |
742 |
OUTPUT: |
743 |
RETVAL |
744 |
|
745 |
int |
746 |
poll_cb(...) |
747 |
PROTOTYPE: |
748 |
CODE: |
749 |
RETVAL = poll_cb (); |
750 |
OUTPUT: |
751 |
RETVAL |
752 |
|
753 |
void |
754 |
poll_wait() |
755 |
PROTOTYPE: |
756 |
CODE: |
757 |
if (nreqs) |
758 |
poll_wait (); |
759 |
|
760 |
int |
761 |
nreqs() |
762 |
PROTOTYPE: |
763 |
CODE: |
764 |
RETVAL = nreqs; |
765 |
OUTPUT: |
766 |
RETVAL |
767 |
|