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, REQ_SYMLINK, |
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 |
74 |
poll_wait () |
75 |
{ |
76 |
if (nreqs && !ress) |
77 |
{ |
78 |
fd_set rfd; |
79 |
FD_ZERO(&rfd); |
80 |
FD_SET(respipe [0], &rfd); |
81 |
|
82 |
select (respipe [0] + 1, &rfd, 0, 0, 0); |
83 |
} |
84 |
} |
85 |
|
86 |
static int |
87 |
poll_cb () |
88 |
{ |
89 |
dSP; |
90 |
int count = 0; |
91 |
aio_req req, prv; |
92 |
|
93 |
pthread_mutex_lock (&reslock); |
94 |
|
95 |
{ |
96 |
/* read any signals sent by the worker threads */ |
97 |
char buf [32]; |
98 |
while (read (respipe [0], buf, 32) == 32) |
99 |
; |
100 |
} |
101 |
|
102 |
req = ress; |
103 |
ress = rese = 0; |
104 |
|
105 |
pthread_mutex_unlock (&reslock); |
106 |
|
107 |
while (req) |
108 |
{ |
109 |
nreqs--; |
110 |
|
111 |
if (req->type == REQ_QUIT) |
112 |
started--; |
113 |
else |
114 |
{ |
115 |
int errorno = errno; |
116 |
errno = req->errorno; |
117 |
|
118 |
if (req->type == REQ_READ) |
119 |
SvCUR_set (req->data, req->dataoffset |
120 |
+ req->result > 0 ? req->result : 0); |
121 |
|
122 |
if (req->data) |
123 |
SvREFCNT_dec (req->data); |
124 |
|
125 |
if (req->fh) |
126 |
SvREFCNT_dec (req->fh); |
127 |
|
128 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
129 |
{ |
130 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
131 |
PL_laststatval = req->result; |
132 |
PL_statcache = *(req->statdata); |
133 |
|
134 |
Safefree (req->statdata); |
135 |
} |
136 |
|
137 |
ENTER; |
138 |
PUSHMARK (SP); |
139 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
140 |
|
141 |
if (req->type == REQ_OPEN) |
142 |
{ |
143 |
/* convert fd to fh */ |
144 |
SV *fh; |
145 |
|
146 |
PUTBACK; |
147 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
148 |
SPAGAIN; |
149 |
|
150 |
fh = SvREFCNT_inc (POPs); |
151 |
|
152 |
PUSHMARK (SP); |
153 |
XPUSHs (sv_2mortal (fh)); |
154 |
} |
155 |
|
156 |
if (SvOK (req->callback)) |
157 |
{ |
158 |
PUTBACK; |
159 |
call_sv (req->callback, G_VOID | G_EVAL); |
160 |
SPAGAIN; |
161 |
} |
162 |
|
163 |
LEAVE; |
164 |
|
165 |
if (req->callback) |
166 |
SvREFCNT_dec (req->callback); |
167 |
|
168 |
errno = errorno; |
169 |
count++; |
170 |
} |
171 |
|
172 |
prv = req; |
173 |
req = req->next; |
174 |
Safefree (prv); |
175 |
|
176 |
/* TODO: croak on errors? */ |
177 |
} |
178 |
|
179 |
return count; |
180 |
} |
181 |
|
182 |
static void *aio_proc(void *arg); |
183 |
|
184 |
static void |
185 |
start_thread (void) |
186 |
{ |
187 |
sigset_t fullsigset, oldsigset; |
188 |
pthread_t tid; |
189 |
pthread_attr_t attr; |
190 |
|
191 |
pthread_attr_init (&attr); |
192 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
193 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
194 |
|
195 |
sigfillset (&fullsigset); |
196 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
197 |
|
198 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
199 |
started++; |
200 |
|
201 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
202 |
} |
203 |
|
204 |
static void |
205 |
send_req (aio_req req) |
206 |
{ |
207 |
nreqs++; |
208 |
|
209 |
pthread_mutex_lock (&reqlock); |
210 |
|
211 |
req->next = 0; |
212 |
|
213 |
if (reqe) |
214 |
{ |
215 |
reqe->next = req; |
216 |
reqe = req; |
217 |
} |
218 |
else |
219 |
reqe = reqs = req; |
220 |
|
221 |
pthread_cond_signal (&reqwait); |
222 |
pthread_mutex_unlock (&reqlock); |
223 |
|
224 |
while (nreqs > max_outstanding) |
225 |
{ |
226 |
poll_wait (); |
227 |
poll_cb (); |
228 |
} |
229 |
} |
230 |
|
231 |
static void |
232 |
end_thread (void) |
233 |
{ |
234 |
aio_req req; |
235 |
New (0, req, 1, aio_cb); |
236 |
req->type = REQ_QUIT; |
237 |
|
238 |
send_req (req); |
239 |
} |
240 |
|
241 |
|
242 |
static void min_parallel (int nthreads) |
243 |
{ |
244 |
while (nthreads > started) |
245 |
start_thread (); |
246 |
} |
247 |
|
248 |
static void max_parallel (int nthreads) |
249 |
{ |
250 |
int cur = started; |
251 |
while (cur > nthreads) |
252 |
{ |
253 |
end_thread (); |
254 |
cur--; |
255 |
} |
256 |
|
257 |
while (started > nthreads) |
258 |
{ |
259 |
poll_wait (); |
260 |
poll_cb (); |
261 |
} |
262 |
} |
263 |
|
264 |
static int fork_started; |
265 |
|
266 |
static void atfork_prepare (void) |
267 |
{ |
268 |
pthread_mutex_lock (&frklock); |
269 |
|
270 |
fork_started = started; |
271 |
|
272 |
for (;;) { |
273 |
while (nreqs) |
274 |
{ |
275 |
poll_wait (); |
276 |
poll_cb (); |
277 |
} |
278 |
|
279 |
max_parallel (0); |
280 |
|
281 |
pthread_mutex_lock (&reqlock); |
282 |
|
283 |
if (!nreqs && !started) |
284 |
break; |
285 |
|
286 |
pthread_mutex_unlock (&reqlock); |
287 |
|
288 |
min_parallel (fork_started); |
289 |
} |
290 |
|
291 |
pthread_mutex_lock (&reslock); |
292 |
|
293 |
assert (!started); |
294 |
assert (!nreqs); |
295 |
assert (!reqs && !reqe); |
296 |
assert (!ress && !rese); |
297 |
} |
298 |
|
299 |
static void atfork_parent (void) |
300 |
{ |
301 |
pthread_mutex_unlock (&reslock); |
302 |
min_parallel (fork_started); |
303 |
pthread_mutex_unlock (&reqlock); |
304 |
pthread_mutex_unlock (&frklock); |
305 |
} |
306 |
|
307 |
static void atfork_child (void) |
308 |
{ |
309 |
reqs = reqe = 0; |
310 |
|
311 |
atfork_parent (); |
312 |
} |
313 |
|
314 |
/*****************************************************************************/ |
315 |
/* work around various missing functions */ |
316 |
|
317 |
#if !HAVE_PREADWRITE |
318 |
# define pread aio_pread |
319 |
# define pwrite aio_pwrite |
320 |
|
321 |
/* |
322 |
* make our pread/pwrite safe against themselves, but not against |
323 |
* normal read/write by using a mutex. slows down execution a lot, |
324 |
* but that's your problem, not mine. |
325 |
*/ |
326 |
static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
327 |
|
328 |
static ssize_t |
329 |
pread (int fd, void *buf, size_t count, off_t offset) |
330 |
{ |
331 |
ssize_t res; |
332 |
off_t ooffset; |
333 |
|
334 |
pthread_mutex_lock (&iolock); |
335 |
ooffset = lseek (fd, 0, SEEK_CUR); |
336 |
lseek (fd, offset, SEEK_SET); |
337 |
res = read (fd, buf, count); |
338 |
lseek (fd, ooffset, SEEK_SET); |
339 |
pthread_mutex_unlock (&iolock); |
340 |
|
341 |
return res; |
342 |
} |
343 |
|
344 |
static ssize_t |
345 |
pwrite (int fd, void *buf, size_t count, off_t offset) |
346 |
{ |
347 |
ssize_t res; |
348 |
off_t ooffset; |
349 |
|
350 |
pthread_mutex_lock (&iolock); |
351 |
ooffset = lseek (fd, 0, SEEK_CUR); |
352 |
lseek (fd, offset, SEEK_SET); |
353 |
res = write (fd, buf, count); |
354 |
lseek (fd, offset, SEEK_SET); |
355 |
pthread_mutex_unlock (&iolock); |
356 |
|
357 |
return res; |
358 |
} |
359 |
#endif |
360 |
|
361 |
#if !HAVE_FDATASYNC |
362 |
# define fdatasync fsync |
363 |
#endif |
364 |
|
365 |
#if !HAVE_READAHEAD |
366 |
# define readahead aio_readahead |
367 |
|
368 |
static char readahead_buf[4096]; |
369 |
|
370 |
static ssize_t |
371 |
readahead (int fd, off_t offset, size_t count) |
372 |
{ |
373 |
while (count > 0) |
374 |
{ |
375 |
size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
376 |
|
377 |
pread (fd, readahead_buf, len, offset); |
378 |
offset += len; |
379 |
count -= len; |
380 |
} |
381 |
|
382 |
errno = 0; |
383 |
} |
384 |
#endif |
385 |
|
386 |
/*****************************************************************************/ |
387 |
|
388 |
static void * |
389 |
aio_proc (void *thr_arg) |
390 |
{ |
391 |
aio_req req; |
392 |
int type; |
393 |
|
394 |
do |
395 |
{ |
396 |
pthread_mutex_lock (&reqlock); |
397 |
|
398 |
for (;;) |
399 |
{ |
400 |
req = reqs; |
401 |
|
402 |
if (reqs) |
403 |
{ |
404 |
reqs = reqs->next; |
405 |
if (!reqs) reqe = 0; |
406 |
} |
407 |
|
408 |
if (req) |
409 |
break; |
410 |
|
411 |
pthread_cond_wait (&reqwait, &reqlock); |
412 |
} |
413 |
|
414 |
pthread_mutex_unlock (&reqlock); |
415 |
|
416 |
errno = 0; /* strictly unnecessary */ |
417 |
|
418 |
type = req->type; |
419 |
|
420 |
switch (type) |
421 |
{ |
422 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
423 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
424 |
|
425 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
426 |
|
427 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
428 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
429 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
430 |
|
431 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
432 |
case REQ_CLOSE: req->result = close (req->fd); break; |
433 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
434 |
case REQ_RMDIR: req->result = rmdir (req->dataptr); break; |
435 |
case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break; |
436 |
|
437 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
438 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
439 |
|
440 |
case REQ_QUIT: |
441 |
break; |
442 |
|
443 |
default: |
444 |
req->result = ENOSYS; |
445 |
break; |
446 |
} |
447 |
|
448 |
req->errorno = errno; |
449 |
|
450 |
pthread_mutex_lock (&reslock); |
451 |
|
452 |
req->next = 0; |
453 |
|
454 |
if (rese) |
455 |
{ |
456 |
rese->next = req; |
457 |
rese = req; |
458 |
} |
459 |
else |
460 |
{ |
461 |
rese = ress = req; |
462 |
|
463 |
/* write a dummy byte to the pipe so fh becomes ready */ |
464 |
write (respipe [1], &respipe, 1); |
465 |
} |
466 |
|
467 |
pthread_mutex_unlock (&reslock); |
468 |
} |
469 |
while (type != REQ_QUIT); |
470 |
|
471 |
return 0; |
472 |
} |
473 |
|
474 |
#define dREQ \ |
475 |
aio_req req; \ |
476 |
\ |
477 |
if (SvOK (callback) && !SvROK (callback)) \ |
478 |
croak ("clalback must be undef or of reference type"); \ |
479 |
\ |
480 |
Newz (0, req, 1, aio_cb); \ |
481 |
if (!req) \ |
482 |
croak ("out of memory during aio_req allocation"); \ |
483 |
\ |
484 |
req->callback = SvREFCNT_inc (callback); |
485 |
|
486 |
MODULE = IO::AIO PACKAGE = IO::AIO |
487 |
|
488 |
PROTOTYPES: ENABLE |
489 |
|
490 |
BOOT: |
491 |
{ |
492 |
if (pipe (respipe)) |
493 |
croak ("unable to initialize result pipe"); |
494 |
|
495 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
496 |
croak ("cannot set result pipe to nonblocking mode"); |
497 |
|
498 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
499 |
croak ("cannot set result pipe to nonblocking mode"); |
500 |
|
501 |
pthread_atfork (atfork_prepare, atfork_parent, atfork_child); |
502 |
} |
503 |
|
504 |
void |
505 |
min_parallel(nthreads) |
506 |
int nthreads |
507 |
PROTOTYPE: $ |
508 |
|
509 |
void |
510 |
max_parallel(nthreads) |
511 |
int nthreads |
512 |
PROTOTYPE: $ |
513 |
|
514 |
int |
515 |
max_outstanding(nreqs) |
516 |
int nreqs |
517 |
PROTOTYPE: $ |
518 |
CODE: |
519 |
RETVAL = max_outstanding; |
520 |
max_outstanding = nreqs; |
521 |
|
522 |
void |
523 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
524 |
SV * pathname |
525 |
int flags |
526 |
int mode |
527 |
SV * callback |
528 |
PROTOTYPE: $$$;$ |
529 |
CODE: |
530 |
{ |
531 |
dREQ; |
532 |
|
533 |
req->type = REQ_OPEN; |
534 |
req->data = newSVsv (pathname); |
535 |
req->dataptr = SvPVbyte_nolen (req->data); |
536 |
req->fd = flags; |
537 |
req->mode = mode; |
538 |
|
539 |
send_req (req); |
540 |
} |
541 |
|
542 |
void |
543 |
aio_close(fh,callback=&PL_sv_undef) |
544 |
SV * fh |
545 |
SV * callback |
546 |
PROTOTYPE: $;$ |
547 |
ALIAS: |
548 |
aio_close = REQ_CLOSE |
549 |
aio_fsync = REQ_FSYNC |
550 |
aio_fdatasync = REQ_FDATASYNC |
551 |
CODE: |
552 |
{ |
553 |
dREQ; |
554 |
|
555 |
req->type = ix; |
556 |
req->fh = newSVsv (fh); |
557 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
558 |
|
559 |
send_req (req); |
560 |
} |
561 |
|
562 |
void |
563 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
564 |
SV * fh |
565 |
UV offset |
566 |
IV length |
567 |
SV * data |
568 |
IV dataoffset |
569 |
SV * callback |
570 |
ALIAS: |
571 |
aio_read = REQ_READ |
572 |
aio_write = REQ_WRITE |
573 |
PROTOTYPE: $$$$$;$ |
574 |
CODE: |
575 |
{ |
576 |
aio_req req; |
577 |
STRLEN svlen; |
578 |
char *svptr = SvPVbyte (data, svlen); |
579 |
|
580 |
SvUPGRADE (data, SVt_PV); |
581 |
SvPOK_on (data); |
582 |
|
583 |
if (dataoffset < 0) |
584 |
dataoffset += svlen; |
585 |
|
586 |
if (dataoffset < 0 || dataoffset > svlen) |
587 |
croak ("data offset outside of string"); |
588 |
|
589 |
if (ix == REQ_WRITE) |
590 |
{ |
591 |
/* write: check length and adjust. */ |
592 |
if (length < 0 || length + dataoffset > svlen) |
593 |
length = svlen - dataoffset; |
594 |
} |
595 |
else |
596 |
{ |
597 |
/* read: grow scalar as necessary */ |
598 |
svptr = SvGROW (data, length + dataoffset); |
599 |
} |
600 |
|
601 |
if (length < 0) |
602 |
croak ("length must not be negative"); |
603 |
|
604 |
{ |
605 |
dREQ; |
606 |
|
607 |
req->type = ix; |
608 |
req->fh = newSVsv (fh); |
609 |
req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) |
610 |
: IoOFP (sv_2io (fh))); |
611 |
req->offset = offset; |
612 |
req->length = length; |
613 |
req->data = SvREFCNT_inc (data); |
614 |
req->dataptr = (char *)svptr + dataoffset; |
615 |
req->callback = SvREFCNT_inc (callback); |
616 |
|
617 |
send_req (req); |
618 |
} |
619 |
} |
620 |
|
621 |
void |
622 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
623 |
SV * fh |
624 |
UV offset |
625 |
IV length |
626 |
SV * callback |
627 |
PROTOTYPE: $$$;$ |
628 |
CODE: |
629 |
{ |
630 |
dREQ; |
631 |
|
632 |
req->type = REQ_READAHEAD; |
633 |
req->fh = newSVsv (fh); |
634 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
635 |
req->offset = offset; |
636 |
req->length = length; |
637 |
|
638 |
send_req (req); |
639 |
} |
640 |
|
641 |
void |
642 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
643 |
SV * fh_or_path |
644 |
SV * callback |
645 |
ALIAS: |
646 |
aio_stat = REQ_STAT |
647 |
aio_lstat = REQ_LSTAT |
648 |
CODE: |
649 |
{ |
650 |
dREQ; |
651 |
|
652 |
New (0, req->statdata, 1, Stat_t); |
653 |
if (!req->statdata) |
654 |
croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)"); |
655 |
|
656 |
if (SvPOK (fh_or_path)) |
657 |
{ |
658 |
req->type = ix; |
659 |
req->data = newSVsv (fh_or_path); |
660 |
req->dataptr = SvPVbyte_nolen (req->data); |
661 |
} |
662 |
else |
663 |
{ |
664 |
req->type = REQ_FSTAT; |
665 |
req->fh = newSVsv (fh_or_path); |
666 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
667 |
} |
668 |
|
669 |
send_req (req); |
670 |
} |
671 |
|
672 |
void |
673 |
aio_unlink(pathname,callback=&PL_sv_undef) |
674 |
SV * pathname |
675 |
SV * callback |
676 |
ALIAS: |
677 |
aio_unlink = REQ_UNLINK |
678 |
aio_rmdir = REQ_RMDIR |
679 |
CODE: |
680 |
{ |
681 |
dREQ; |
682 |
|
683 |
req->type = ix; |
684 |
req->data = newSVsv (pathname); |
685 |
req->dataptr = SvPVbyte_nolen (req->data); |
686 |
|
687 |
send_req (req); |
688 |
} |
689 |
|
690 |
void |
691 |
aio_symlink(oldpath,newpath,callback=&PL_sv_undef) |
692 |
SV * oldpath |
693 |
SV * newpath |
694 |
SV * callback |
695 |
CODE: |
696 |
{ |
697 |
dREQ; |
698 |
|
699 |
req->type = REQ_SYMLINK; |
700 |
req->fh = newSVsv (oldpath); |
701 |
req->data2ptr = SvPVbyte_nolen (req->fh); |
702 |
req->data = newSVsv (newpath); |
703 |
req->dataptr = SvPVbyte_nolen (req->data); |
704 |
|
705 |
send_req (req); |
706 |
} |
707 |
|
708 |
void |
709 |
flush() |
710 |
PROTOTYPE: |
711 |
CODE: |
712 |
while (nreqs) |
713 |
{ |
714 |
poll_wait (); |
715 |
poll_cb (); |
716 |
} |
717 |
|
718 |
void |
719 |
poll() |
720 |
PROTOTYPE: |
721 |
CODE: |
722 |
if (nreqs) |
723 |
{ |
724 |
poll_wait (); |
725 |
poll_cb (); |
726 |
} |
727 |
|
728 |
int |
729 |
poll_fileno() |
730 |
PROTOTYPE: |
731 |
CODE: |
732 |
RETVAL = respipe [0]; |
733 |
OUTPUT: |
734 |
RETVAL |
735 |
|
736 |
int |
737 |
poll_cb(...) |
738 |
PROTOTYPE: |
739 |
CODE: |
740 |
RETVAL = poll_cb (); |
741 |
OUTPUT: |
742 |
RETVAL |
743 |
|
744 |
void |
745 |
poll_wait() |
746 |
PROTOTYPE: |
747 |
CODE: |
748 |
if (nreqs) |
749 |
poll_wait (); |
750 |
|
751 |
int |
752 |
nreqs() |
753 |
PROTOTYPE: |
754 |
CODE: |
755 |
RETVAL = nreqs; |
756 |
OUTPUT: |
757 |
RETVAL |
758 |
|