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 |
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 |
int do_croak = 0; |
92 |
aio_req req, prv; |
93 |
|
94 |
pthread_mutex_lock (&reslock); |
95 |
|
96 |
{ |
97 |
/* read any signals sent by the worker threads */ |
98 |
char buf [32]; |
99 |
while (read (respipe [0], buf, 32) == 32) |
100 |
; |
101 |
} |
102 |
|
103 |
req = ress; |
104 |
ress = rese = 0; |
105 |
|
106 |
pthread_mutex_unlock (&reslock); |
107 |
|
108 |
while (req) |
109 |
{ |
110 |
nreqs--; |
111 |
|
112 |
if (req->type == REQ_QUIT) |
113 |
started--; |
114 |
else |
115 |
{ |
116 |
int errorno = errno; |
117 |
errno = req->errorno; |
118 |
|
119 |
if (req->type == REQ_READ) |
120 |
SvCUR_set (req->data, req->dataoffset |
121 |
+ req->result > 0 ? req->result : 0); |
122 |
|
123 |
if (req->data) |
124 |
SvREFCNT_dec (req->data); |
125 |
|
126 |
if (req->fh) |
127 |
SvREFCNT_dec (req->fh); |
128 |
|
129 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
130 |
{ |
131 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
132 |
PL_laststatval = req->result; |
133 |
PL_statcache = *(req->statdata); |
134 |
|
135 |
Safefree (req->statdata); |
136 |
} |
137 |
|
138 |
ENTER; |
139 |
PUSHMARK (SP); |
140 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
141 |
|
142 |
if (req->type == REQ_OPEN) |
143 |
{ |
144 |
/* convert fd to fh */ |
145 |
SV *fh; |
146 |
|
147 |
PUTBACK; |
148 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
149 |
SPAGAIN; |
150 |
|
151 |
fh = SvREFCNT_inc (POPs); |
152 |
|
153 |
PUSHMARK (SP); |
154 |
XPUSHs (sv_2mortal (fh)); |
155 |
} |
156 |
|
157 |
if (SvOK (req->callback)) |
158 |
{ |
159 |
PUTBACK; |
160 |
call_sv (req->callback, G_VOID | G_EVAL); |
161 |
SPAGAIN; |
162 |
} |
163 |
|
164 |
do_croak = SvTRUE (ERRSV); |
165 |
|
166 |
LEAVE; |
167 |
|
168 |
if (req->callback) |
169 |
SvREFCNT_dec (req->callback); |
170 |
|
171 |
errno = errorno; |
172 |
count++; |
173 |
} |
174 |
|
175 |
prv = req; |
176 |
req = req->next; |
177 |
Safefree (prv); |
178 |
|
179 |
if (do_croak) |
180 |
croak (0); |
181 |
} |
182 |
|
183 |
return count; |
184 |
} |
185 |
|
186 |
static void *aio_proc(void *arg); |
187 |
|
188 |
static void |
189 |
start_thread (void) |
190 |
{ |
191 |
sigset_t fullsigset, oldsigset; |
192 |
pthread_t tid; |
193 |
pthread_attr_t attr; |
194 |
|
195 |
pthread_attr_init (&attr); |
196 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
197 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
198 |
|
199 |
sigfillset (&fullsigset); |
200 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
201 |
|
202 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
203 |
started++; |
204 |
|
205 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
206 |
} |
207 |
|
208 |
static void |
209 |
send_req (aio_req req) |
210 |
{ |
211 |
nreqs++; |
212 |
|
213 |
pthread_mutex_lock (&reqlock); |
214 |
|
215 |
req->next = 0; |
216 |
|
217 |
if (reqe) |
218 |
{ |
219 |
reqe->next = req; |
220 |
reqe = req; |
221 |
} |
222 |
else |
223 |
reqe = reqs = req; |
224 |
|
225 |
pthread_cond_signal (&reqwait); |
226 |
pthread_mutex_unlock (&reqlock); |
227 |
|
228 |
while (nreqs > max_outstanding) |
229 |
{ |
230 |
poll_wait (); |
231 |
poll_cb (); |
232 |
} |
233 |
} |
234 |
|
235 |
static void |
236 |
end_thread (void) |
237 |
{ |
238 |
aio_req req; |
239 |
New (0, req, 1, aio_cb); |
240 |
req->type = REQ_QUIT; |
241 |
|
242 |
send_req (req); |
243 |
} |
244 |
|
245 |
|
246 |
static void min_parallel (int nthreads) |
247 |
{ |
248 |
while (nthreads > started) |
249 |
start_thread (); |
250 |
} |
251 |
|
252 |
static void max_parallel (int nthreads) |
253 |
{ |
254 |
int cur = started; |
255 |
while (cur > nthreads) |
256 |
{ |
257 |
end_thread (); |
258 |
cur--; |
259 |
} |
260 |
|
261 |
while (started > nthreads) |
262 |
{ |
263 |
poll_wait (); |
264 |
poll_cb (); |
265 |
} |
266 |
} |
267 |
|
268 |
static int fork_started; |
269 |
|
270 |
static void atfork_prepare (void) |
271 |
{ |
272 |
pthread_mutex_lock (&frklock); |
273 |
|
274 |
fork_started = started; |
275 |
|
276 |
for (;;) { |
277 |
while (nreqs) |
278 |
{ |
279 |
poll_wait (); |
280 |
poll_cb (); |
281 |
} |
282 |
|
283 |
max_parallel (0); |
284 |
|
285 |
pthread_mutex_lock (&reqlock); |
286 |
|
287 |
if (!nreqs && !started) |
288 |
break; |
289 |
|
290 |
pthread_mutex_unlock (&reqlock); |
291 |
|
292 |
min_parallel (fork_started); |
293 |
} |
294 |
|
295 |
pthread_mutex_lock (&reslock); |
296 |
|
297 |
assert (!started); |
298 |
assert (!nreqs); |
299 |
assert (!reqs && !reqe); |
300 |
assert (!ress && !rese); |
301 |
} |
302 |
|
303 |
static void atfork_parent (void) |
304 |
{ |
305 |
pthread_mutex_unlock (&reslock); |
306 |
min_parallel (fork_started); |
307 |
pthread_mutex_unlock (&reqlock); |
308 |
pthread_mutex_unlock (&frklock); |
309 |
} |
310 |
|
311 |
static void atfork_child (void) |
312 |
{ |
313 |
reqs = reqe = 0; |
314 |
|
315 |
atfork_parent (); |
316 |
} |
317 |
|
318 |
/*****************************************************************************/ |
319 |
/* work around various missing functions */ |
320 |
|
321 |
#if !HAVE_PREADWRITE |
322 |
# define pread aio_pread |
323 |
# define pwrite aio_pwrite |
324 |
|
325 |
/* |
326 |
* make our pread/pwrite safe against themselves, but not against |
327 |
* normal read/write by using a mutex. slows down execution a lot, |
328 |
* but that's your problem, not mine. |
329 |
*/ |
330 |
static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
331 |
|
332 |
static ssize_t |
333 |
pread (int fd, void *buf, size_t count, off_t offset) |
334 |
{ |
335 |
ssize_t res; |
336 |
off_t ooffset; |
337 |
|
338 |
pthread_mutex_lock (&iolock); |
339 |
ooffset = lseek (fd, 0, SEEK_CUR); |
340 |
lseek (fd, offset, SEEK_SET); |
341 |
res = read (fd, buf, count); |
342 |
lseek (fd, ooffset, SEEK_SET); |
343 |
pthread_mutex_unlock (&iolock); |
344 |
|
345 |
return res; |
346 |
} |
347 |
|
348 |
static ssize_t |
349 |
pwrite (int fd, void *buf, size_t count, off_t offset) |
350 |
{ |
351 |
ssize_t res; |
352 |
off_t ooffset; |
353 |
|
354 |
pthread_mutex_lock (&iolock); |
355 |
ooffset = lseek (fd, 0, SEEK_CUR); |
356 |
lseek (fd, offset, SEEK_SET); |
357 |
res = write (fd, buf, count); |
358 |
lseek (fd, offset, SEEK_SET); |
359 |
pthread_mutex_unlock (&iolock); |
360 |
|
361 |
return res; |
362 |
} |
363 |
#endif |
364 |
|
365 |
#if !HAVE_FDATASYNC |
366 |
# define fdatasync fsync |
367 |
#endif |
368 |
|
369 |
#if !HAVE_READAHEAD |
370 |
# define readahead aio_readahead |
371 |
|
372 |
static char readahead_buf[4096]; |
373 |
|
374 |
static ssize_t |
375 |
readahead (int fd, off_t offset, size_t count) |
376 |
{ |
377 |
while (count > 0) |
378 |
{ |
379 |
size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
380 |
|
381 |
pread (fd, readahead_buf, len, offset); |
382 |
offset += len; |
383 |
count -= len; |
384 |
} |
385 |
|
386 |
errno = 0; |
387 |
} |
388 |
#endif |
389 |
|
390 |
/*****************************************************************************/ |
391 |
|
392 |
static void * |
393 |
aio_proc (void *thr_arg) |
394 |
{ |
395 |
aio_req req; |
396 |
int type; |
397 |
|
398 |
do |
399 |
{ |
400 |
pthread_mutex_lock (&reqlock); |
401 |
|
402 |
for (;;) |
403 |
{ |
404 |
req = reqs; |
405 |
|
406 |
if (reqs) |
407 |
{ |
408 |
reqs = reqs->next; |
409 |
if (!reqs) reqe = 0; |
410 |
} |
411 |
|
412 |
if (req) |
413 |
break; |
414 |
|
415 |
pthread_cond_wait (&reqwait, &reqlock); |
416 |
} |
417 |
|
418 |
pthread_mutex_unlock (&reqlock); |
419 |
|
420 |
errno = 0; /* strictly unnecessary */ |
421 |
|
422 |
type = req->type; |
423 |
|
424 |
switch (type) |
425 |
{ |
426 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
427 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
428 |
|
429 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
430 |
|
431 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
432 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
433 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
434 |
|
435 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
436 |
case REQ_CLOSE: req->result = close (req->fd); break; |
437 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
438 |
case REQ_RMDIR: req->result = rmdir (req->dataptr); break; |
439 |
case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break; |
440 |
|
441 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
442 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
443 |
|
444 |
case REQ_QUIT: |
445 |
break; |
446 |
|
447 |
default: |
448 |
req->result = ENOSYS; |
449 |
break; |
450 |
} |
451 |
|
452 |
req->errorno = errno; |
453 |
|
454 |
pthread_mutex_lock (&reslock); |
455 |
|
456 |
req->next = 0; |
457 |
|
458 |
if (rese) |
459 |
{ |
460 |
rese->next = req; |
461 |
rese = req; |
462 |
} |
463 |
else |
464 |
{ |
465 |
rese = ress = req; |
466 |
|
467 |
/* write a dummy byte to the pipe so fh becomes ready */ |
468 |
write (respipe [1], &respipe, 1); |
469 |
} |
470 |
|
471 |
pthread_mutex_unlock (&reslock); |
472 |
} |
473 |
while (type != REQ_QUIT); |
474 |
|
475 |
return 0; |
476 |
} |
477 |
|
478 |
#define dREQ \ |
479 |
aio_req req; \ |
480 |
\ |
481 |
if (SvOK (callback) && !SvROK (callback)) \ |
482 |
croak ("clalback must be undef or of reference type"); \ |
483 |
\ |
484 |
Newz (0, req, 1, aio_cb); \ |
485 |
if (!req) \ |
486 |
croak ("out of memory during aio_req allocation"); \ |
487 |
\ |
488 |
req->callback = SvREFCNT_inc (callback); |
489 |
|
490 |
MODULE = IO::AIO PACKAGE = IO::AIO |
491 |
|
492 |
PROTOTYPES: ENABLE |
493 |
|
494 |
BOOT: |
495 |
{ |
496 |
if (pipe (respipe)) |
497 |
croak ("unable to initialize result pipe"); |
498 |
|
499 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
500 |
croak ("cannot set result pipe to nonblocking mode"); |
501 |
|
502 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
503 |
croak ("cannot set result pipe to nonblocking mode"); |
504 |
|
505 |
pthread_atfork (atfork_prepare, atfork_parent, atfork_child); |
506 |
} |
507 |
|
508 |
void |
509 |
min_parallel(nthreads) |
510 |
int nthreads |
511 |
PROTOTYPE: $ |
512 |
|
513 |
void |
514 |
max_parallel(nthreads) |
515 |
int nthreads |
516 |
PROTOTYPE: $ |
517 |
|
518 |
int |
519 |
max_outstanding(nreqs) |
520 |
int nreqs |
521 |
PROTOTYPE: $ |
522 |
CODE: |
523 |
RETVAL = max_outstanding; |
524 |
max_outstanding = nreqs; |
525 |
|
526 |
void |
527 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
528 |
SV * pathname |
529 |
int flags |
530 |
int mode |
531 |
SV * callback |
532 |
PROTOTYPE: $$$;$ |
533 |
CODE: |
534 |
{ |
535 |
dREQ; |
536 |
|
537 |
req->type = REQ_OPEN; |
538 |
req->data = newSVsv (pathname); |
539 |
req->dataptr = SvPVbyte_nolen (req->data); |
540 |
req->fd = flags; |
541 |
req->mode = mode; |
542 |
|
543 |
send_req (req); |
544 |
} |
545 |
|
546 |
void |
547 |
aio_close(fh,callback=&PL_sv_undef) |
548 |
SV * fh |
549 |
SV * callback |
550 |
PROTOTYPE: $;$ |
551 |
ALIAS: |
552 |
aio_close = REQ_CLOSE |
553 |
aio_fsync = REQ_FSYNC |
554 |
aio_fdatasync = REQ_FDATASYNC |
555 |
CODE: |
556 |
{ |
557 |
dREQ; |
558 |
|
559 |
req->type = ix; |
560 |
req->fh = newSVsv (fh); |
561 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
562 |
|
563 |
send_req (req); |
564 |
} |
565 |
|
566 |
void |
567 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
568 |
SV * fh |
569 |
UV offset |
570 |
IV length |
571 |
SV * data |
572 |
IV dataoffset |
573 |
SV * callback |
574 |
ALIAS: |
575 |
aio_read = REQ_READ |
576 |
aio_write = REQ_WRITE |
577 |
PROTOTYPE: $$$$$;$ |
578 |
CODE: |
579 |
{ |
580 |
aio_req req; |
581 |
STRLEN svlen; |
582 |
char *svptr = SvPVbyte (data, svlen); |
583 |
|
584 |
SvUPGRADE (data, SVt_PV); |
585 |
SvPOK_on (data); |
586 |
|
587 |
if (dataoffset < 0) |
588 |
dataoffset += svlen; |
589 |
|
590 |
if (dataoffset < 0 || dataoffset > svlen) |
591 |
croak ("data offset outside of string"); |
592 |
|
593 |
if (ix == REQ_WRITE) |
594 |
{ |
595 |
/* write: check length and adjust. */ |
596 |
if (length < 0 || length + dataoffset > svlen) |
597 |
length = svlen - dataoffset; |
598 |
} |
599 |
else |
600 |
{ |
601 |
/* read: grow scalar as necessary */ |
602 |
svptr = SvGROW (data, length + dataoffset); |
603 |
} |
604 |
|
605 |
if (length < 0) |
606 |
croak ("length must not be negative"); |
607 |
|
608 |
{ |
609 |
dREQ; |
610 |
|
611 |
req->type = ix; |
612 |
req->fh = newSVsv (fh); |
613 |
req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) |
614 |
: IoOFP (sv_2io (fh))); |
615 |
req->offset = offset; |
616 |
req->length = length; |
617 |
req->data = SvREFCNT_inc (data); |
618 |
req->dataptr = (char *)svptr + dataoffset; |
619 |
req->callback = SvREFCNT_inc (callback); |
620 |
|
621 |
send_req (req); |
622 |
} |
623 |
} |
624 |
|
625 |
void |
626 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
627 |
SV * fh |
628 |
UV offset |
629 |
IV length |
630 |
SV * callback |
631 |
PROTOTYPE: $$$;$ |
632 |
CODE: |
633 |
{ |
634 |
dREQ; |
635 |
|
636 |
req->type = REQ_READAHEAD; |
637 |
req->fh = newSVsv (fh); |
638 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
639 |
req->offset = offset; |
640 |
req->length = length; |
641 |
|
642 |
send_req (req); |
643 |
} |
644 |
|
645 |
void |
646 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
647 |
SV * fh_or_path |
648 |
SV * callback |
649 |
ALIAS: |
650 |
aio_stat = REQ_STAT |
651 |
aio_lstat = REQ_LSTAT |
652 |
CODE: |
653 |
{ |
654 |
dREQ; |
655 |
|
656 |
New (0, req->statdata, 1, Stat_t); |
657 |
if (!req->statdata) |
658 |
croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)"); |
659 |
|
660 |
if (SvPOK (fh_or_path)) |
661 |
{ |
662 |
req->type = ix; |
663 |
req->data = newSVsv (fh_or_path); |
664 |
req->dataptr = SvPVbyte_nolen (req->data); |
665 |
} |
666 |
else |
667 |
{ |
668 |
req->type = REQ_FSTAT; |
669 |
req->fh = newSVsv (fh_or_path); |
670 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
671 |
} |
672 |
|
673 |
send_req (req); |
674 |
} |
675 |
|
676 |
void |
677 |
aio_unlink(pathname,callback=&PL_sv_undef) |
678 |
SV * pathname |
679 |
SV * callback |
680 |
ALIAS: |
681 |
aio_unlink = REQ_UNLINK |
682 |
aio_rmdir = REQ_RMDIR |
683 |
CODE: |
684 |
{ |
685 |
dREQ; |
686 |
|
687 |
req->type = ix; |
688 |
req->data = newSVsv (pathname); |
689 |
req->dataptr = SvPVbyte_nolen (req->data); |
690 |
|
691 |
send_req (req); |
692 |
} |
693 |
|
694 |
void |
695 |
aio_symlink(oldpath,newpath,callback=&PL_sv_undef) |
696 |
SV * oldpath |
697 |
SV * newpath |
698 |
SV * callback |
699 |
CODE: |
700 |
{ |
701 |
dREQ; |
702 |
|
703 |
req->type = REQ_SYMLINK; |
704 |
req->fh = newSVsv (oldpath); |
705 |
req->data2ptr = SvPVbyte_nolen (req->fh); |
706 |
req->data = newSVsv (newpath); |
707 |
req->dataptr = SvPVbyte_nolen (req->data); |
708 |
|
709 |
send_req (req); |
710 |
} |
711 |
|
712 |
void |
713 |
flush() |
714 |
PROTOTYPE: |
715 |
CODE: |
716 |
while (nreqs) |
717 |
{ |
718 |
poll_wait (); |
719 |
poll_cb (); |
720 |
} |
721 |
|
722 |
void |
723 |
poll() |
724 |
PROTOTYPE: |
725 |
CODE: |
726 |
if (nreqs) |
727 |
{ |
728 |
poll_wait (); |
729 |
poll_cb (); |
730 |
} |
731 |
|
732 |
int |
733 |
poll_fileno() |
734 |
PROTOTYPE: |
735 |
CODE: |
736 |
RETVAL = respipe [0]; |
737 |
OUTPUT: |
738 |
RETVAL |
739 |
|
740 |
int |
741 |
poll_cb(...) |
742 |
PROTOTYPE: |
743 |
CODE: |
744 |
RETVAL = poll_cb (); |
745 |
OUTPUT: |
746 |
RETVAL |
747 |
|
748 |
void |
749 |
poll_wait() |
750 |
PROTOTYPE: |
751 |
CODE: |
752 |
if (nreqs) |
753 |
poll_wait (); |
754 |
|
755 |
int |
756 |
nreqs() |
757 |
PROTOTYPE: |
758 |
CODE: |
759 |
RETVAL = nreqs; |
760 |
OUTPUT: |
761 |
RETVAL |
762 |
|