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_cond_t reqwait = PTHREAD_COND_INITIALIZER; |
68 |
|
69 |
static volatile aio_req reqs, reqe; /* queue start, queue end */ |
70 |
static volatile aio_req ress, rese; /* queue start, queue end */ |
71 |
|
72 |
static void free_req (aio_req req) |
73 |
{ |
74 |
if (req->data) |
75 |
SvREFCNT_dec (req->data); |
76 |
|
77 |
if (req->fh) |
78 |
SvREFCNT_dec (req->fh); |
79 |
|
80 |
if (req->statdata) |
81 |
Safefree (req->statdata); |
82 |
|
83 |
if (req->callback) |
84 |
SvREFCNT_dec (req->callback); |
85 |
|
86 |
Safefree (req); |
87 |
} |
88 |
|
89 |
static void |
90 |
poll_wait () |
91 |
{ |
92 |
if (nreqs && !ress) |
93 |
{ |
94 |
fd_set rfd; |
95 |
FD_ZERO(&rfd); |
96 |
FD_SET(respipe [0], &rfd); |
97 |
|
98 |
select (respipe [0] + 1, &rfd, 0, 0, 0); |
99 |
} |
100 |
} |
101 |
|
102 |
static int |
103 |
poll_cb () |
104 |
{ |
105 |
dSP; |
106 |
int count = 0; |
107 |
int do_croak = 0; |
108 |
aio_req req; |
109 |
|
110 |
for (;;) |
111 |
{ |
112 |
pthread_mutex_lock (&reslock); |
113 |
req = ress; |
114 |
|
115 |
if (req) |
116 |
{ |
117 |
ress = req->next; |
118 |
|
119 |
if (!ress) |
120 |
{ |
121 |
rese = 0; |
122 |
|
123 |
/* read any signals sent by the worker threads */ |
124 |
char buf [32]; |
125 |
while (read (respipe [0], buf, 32) == 32) |
126 |
; |
127 |
} |
128 |
} |
129 |
|
130 |
pthread_mutex_unlock (&reslock); |
131 |
|
132 |
if (!req) |
133 |
break; |
134 |
|
135 |
nreqs--; |
136 |
|
137 |
if (req->type == REQ_QUIT) |
138 |
started--; |
139 |
else |
140 |
{ |
141 |
int errorno = errno; |
142 |
errno = req->errorno; |
143 |
|
144 |
if (req->type == REQ_READ) |
145 |
SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0)); |
146 |
|
147 |
if (req->statdata) |
148 |
{ |
149 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
150 |
PL_laststatval = req->result; |
151 |
PL_statcache = *(req->statdata); |
152 |
} |
153 |
|
154 |
ENTER; |
155 |
PUSHMARK (SP); |
156 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
157 |
|
158 |
if (req->type == REQ_OPEN) |
159 |
{ |
160 |
/* convert fd to fh */ |
161 |
SV *fh; |
162 |
|
163 |
PUTBACK; |
164 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
165 |
SPAGAIN; |
166 |
|
167 |
fh = SvREFCNT_inc (POPs); |
168 |
|
169 |
PUSHMARK (SP); |
170 |
XPUSHs (sv_2mortal (fh)); |
171 |
} |
172 |
|
173 |
if (SvOK (req->callback)) |
174 |
{ |
175 |
PUTBACK; |
176 |
call_sv (req->callback, G_VOID | G_EVAL); |
177 |
SPAGAIN; |
178 |
|
179 |
if (SvTRUE (ERRSV)) |
180 |
{ |
181 |
free_req (req); |
182 |
croak (0); |
183 |
} |
184 |
} |
185 |
|
186 |
LEAVE; |
187 |
|
188 |
errno = errorno; |
189 |
count++; |
190 |
} |
191 |
|
192 |
free_req (req); |
193 |
} |
194 |
|
195 |
return count; |
196 |
} |
197 |
|
198 |
static void *aio_proc(void *arg); |
199 |
|
200 |
static void |
201 |
start_thread (void) |
202 |
{ |
203 |
sigset_t fullsigset, oldsigset; |
204 |
pthread_t tid; |
205 |
pthread_attr_t attr; |
206 |
|
207 |
pthread_attr_init (&attr); |
208 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
209 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
210 |
|
211 |
sigfillset (&fullsigset); |
212 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
213 |
|
214 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
215 |
started++; |
216 |
|
217 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
218 |
} |
219 |
|
220 |
static void |
221 |
send_req (aio_req req) |
222 |
{ |
223 |
nreqs++; |
224 |
|
225 |
pthread_mutex_lock (&reqlock); |
226 |
|
227 |
req->next = 0; |
228 |
|
229 |
if (reqe) |
230 |
{ |
231 |
reqe->next = req; |
232 |
reqe = req; |
233 |
} |
234 |
else |
235 |
reqe = reqs = req; |
236 |
|
237 |
pthread_cond_signal (&reqwait); |
238 |
pthread_mutex_unlock (&reqlock); |
239 |
|
240 |
if (nreqs > max_outstanding) |
241 |
for (;;) |
242 |
{ |
243 |
poll_cb (); |
244 |
|
245 |
if (nreqs <= max_outstanding) |
246 |
break; |
247 |
|
248 |
poll_wait (); |
249 |
} |
250 |
} |
251 |
|
252 |
static void |
253 |
end_thread (void) |
254 |
{ |
255 |
aio_req req; |
256 |
Newz (0, req, 1, aio_cb); |
257 |
req->type = REQ_QUIT; |
258 |
|
259 |
send_req (req); |
260 |
} |
261 |
|
262 |
static void min_parallel (int nthreads) |
263 |
{ |
264 |
while (nthreads > started) |
265 |
start_thread (); |
266 |
} |
267 |
|
268 |
static void max_parallel (int nthreads) |
269 |
{ |
270 |
int cur = started; |
271 |
|
272 |
while (cur > nthreads) |
273 |
{ |
274 |
end_thread (); |
275 |
cur--; |
276 |
} |
277 |
|
278 |
while (started > nthreads) |
279 |
{ |
280 |
poll_wait (); |
281 |
poll_cb (); |
282 |
} |
283 |
} |
284 |
|
285 |
static void create_pipe () |
286 |
{ |
287 |
if (pipe (respipe)) |
288 |
croak ("unable to initialize result pipe"); |
289 |
|
290 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
291 |
croak ("cannot set result pipe to nonblocking mode"); |
292 |
|
293 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
294 |
croak ("cannot set result pipe to nonblocking mode"); |
295 |
} |
296 |
|
297 |
static void atfork_prepare (void) |
298 |
{ |
299 |
for (;;) { |
300 |
|
301 |
for (;;) |
302 |
{ |
303 |
poll_cb (); |
304 |
|
305 |
if (!nreqs) |
306 |
break; |
307 |
|
308 |
poll_wait (); |
309 |
} |
310 |
|
311 |
pthread_mutex_lock (&reqlock); |
312 |
|
313 |
if (!nreqs) |
314 |
break; |
315 |
|
316 |
pthread_mutex_unlock (&reqlock); |
317 |
} |
318 |
|
319 |
pthread_mutex_lock (&reslock); |
320 |
|
321 |
assert (!nreqs && !reqs && !ress); |
322 |
} |
323 |
|
324 |
static void atfork_parent (void) |
325 |
{ |
326 |
pthread_mutex_unlock (&reslock); |
327 |
pthread_mutex_unlock (&reqlock); |
328 |
} |
329 |
|
330 |
static void atfork_child (void) |
331 |
{ |
332 |
int restart = started; |
333 |
started = 0; |
334 |
|
335 |
atfork_parent (); |
336 |
|
337 |
min_parallel (restart); |
338 |
} |
339 |
|
340 |
/*****************************************************************************/ |
341 |
/* work around various missing functions */ |
342 |
|
343 |
#if !HAVE_PREADWRITE |
344 |
# define pread aio_pread |
345 |
# define pwrite aio_pwrite |
346 |
|
347 |
/* |
348 |
* make our pread/pwrite safe against themselves, but not against |
349 |
* normal read/write by using a mutex. slows down execution a lot, |
350 |
* but that's your problem, not mine. |
351 |
*/ |
352 |
static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
353 |
|
354 |
static ssize_t |
355 |
pread (int fd, void *buf, size_t count, off_t offset) |
356 |
{ |
357 |
ssize_t res; |
358 |
off_t ooffset; |
359 |
|
360 |
pthread_mutex_lock (&iolock); |
361 |
ooffset = lseek (fd, 0, SEEK_CUR); |
362 |
lseek (fd, offset, SEEK_SET); |
363 |
res = read (fd, buf, count); |
364 |
lseek (fd, ooffset, SEEK_SET); |
365 |
pthread_mutex_unlock (&iolock); |
366 |
|
367 |
return res; |
368 |
} |
369 |
|
370 |
static ssize_t |
371 |
pwrite (int fd, void *buf, size_t count, off_t offset) |
372 |
{ |
373 |
ssize_t res; |
374 |
off_t ooffset; |
375 |
|
376 |
pthread_mutex_lock (&iolock); |
377 |
ooffset = lseek (fd, 0, SEEK_CUR); |
378 |
lseek (fd, offset, SEEK_SET); |
379 |
res = write (fd, buf, count); |
380 |
lseek (fd, offset, SEEK_SET); |
381 |
pthread_mutex_unlock (&iolock); |
382 |
|
383 |
return res; |
384 |
} |
385 |
#endif |
386 |
|
387 |
#if !HAVE_FDATASYNC |
388 |
# define fdatasync fsync |
389 |
#endif |
390 |
|
391 |
#if !HAVE_READAHEAD |
392 |
# define readahead aio_readahead |
393 |
|
394 |
static char readahead_buf[4096]; |
395 |
|
396 |
static ssize_t |
397 |
readahead (int fd, off_t offset, size_t count) |
398 |
{ |
399 |
while (count > 0) |
400 |
{ |
401 |
size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
402 |
|
403 |
pread (fd, readahead_buf, len, offset); |
404 |
offset += len; |
405 |
count -= len; |
406 |
} |
407 |
|
408 |
errno = 0; |
409 |
} |
410 |
#endif |
411 |
|
412 |
/*****************************************************************************/ |
413 |
|
414 |
static void * |
415 |
aio_proc (void *thr_arg) |
416 |
{ |
417 |
aio_req req; |
418 |
int type; |
419 |
|
420 |
do |
421 |
{ |
422 |
pthread_mutex_lock (&reqlock); |
423 |
|
424 |
for (;;) |
425 |
{ |
426 |
req = reqs; |
427 |
|
428 |
if (reqs) |
429 |
{ |
430 |
reqs = reqs->next; |
431 |
if (!reqs) reqe = 0; |
432 |
} |
433 |
|
434 |
if (req) |
435 |
break; |
436 |
|
437 |
pthread_cond_wait (&reqwait, &reqlock); |
438 |
} |
439 |
|
440 |
pthread_mutex_unlock (&reqlock); |
441 |
|
442 |
errno = 0; /* strictly unnecessary */ |
443 |
|
444 |
type = req->type; |
445 |
|
446 |
switch (type) |
447 |
{ |
448 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
449 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
450 |
|
451 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
452 |
|
453 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
454 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
455 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
456 |
|
457 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
458 |
case REQ_CLOSE: req->result = close (req->fd); break; |
459 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
460 |
case REQ_RMDIR: req->result = rmdir (req->dataptr); break; |
461 |
case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break; |
462 |
|
463 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
464 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
465 |
|
466 |
case REQ_QUIT: |
467 |
break; |
468 |
|
469 |
default: |
470 |
req->result = ENOSYS; |
471 |
break; |
472 |
} |
473 |
|
474 |
req->errorno = errno; |
475 |
|
476 |
pthread_mutex_lock (&reslock); |
477 |
|
478 |
req->next = 0; |
479 |
|
480 |
if (rese) |
481 |
{ |
482 |
rese->next = req; |
483 |
rese = req; |
484 |
} |
485 |
else |
486 |
{ |
487 |
rese = ress = req; |
488 |
|
489 |
/* write a dummy byte to the pipe so fh becomes ready */ |
490 |
write (respipe [1], &respipe, 1); |
491 |
} |
492 |
|
493 |
pthread_mutex_unlock (&reslock); |
494 |
} |
495 |
while (type != REQ_QUIT); |
496 |
|
497 |
return 0; |
498 |
} |
499 |
|
500 |
#define dREQ \ |
501 |
aio_req req; \ |
502 |
\ |
503 |
if (SvOK (callback) && !SvROK (callback)) \ |
504 |
croak ("clalback must be undef or of reference type"); \ |
505 |
\ |
506 |
Newz (0, req, 1, aio_cb); \ |
507 |
if (!req) \ |
508 |
croak ("out of memory during aio_req allocation"); \ |
509 |
\ |
510 |
req->callback = newSVsv (callback); |
511 |
|
512 |
MODULE = IO::AIO PACKAGE = IO::AIO |
513 |
|
514 |
PROTOTYPES: ENABLE |
515 |
|
516 |
BOOT: |
517 |
{ |
518 |
create_pipe (); |
519 |
pthread_atfork (atfork_prepare, atfork_parent, atfork_child); |
520 |
} |
521 |
|
522 |
void |
523 |
min_parallel(nthreads) |
524 |
int nthreads |
525 |
PROTOTYPE: $ |
526 |
|
527 |
void |
528 |
max_parallel(nthreads) |
529 |
int nthreads |
530 |
PROTOTYPE: $ |
531 |
|
532 |
int |
533 |
max_outstanding(nreqs) |
534 |
int nreqs |
535 |
PROTOTYPE: $ |
536 |
CODE: |
537 |
RETVAL = max_outstanding; |
538 |
max_outstanding = nreqs; |
539 |
|
540 |
void |
541 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
542 |
SV * pathname |
543 |
int flags |
544 |
int mode |
545 |
SV * callback |
546 |
PROTOTYPE: $$$;$ |
547 |
CODE: |
548 |
{ |
549 |
dREQ; |
550 |
|
551 |
req->type = REQ_OPEN; |
552 |
req->data = newSVsv (pathname); |
553 |
req->dataptr = SvPVbyte_nolen (req->data); |
554 |
req->fd = flags; |
555 |
req->mode = mode; |
556 |
|
557 |
send_req (req); |
558 |
} |
559 |
|
560 |
void |
561 |
aio_close(fh,callback=&PL_sv_undef) |
562 |
SV * fh |
563 |
SV * callback |
564 |
PROTOTYPE: $;$ |
565 |
ALIAS: |
566 |
aio_close = REQ_CLOSE |
567 |
aio_fsync = REQ_FSYNC |
568 |
aio_fdatasync = REQ_FDATASYNC |
569 |
CODE: |
570 |
{ |
571 |
dREQ; |
572 |
|
573 |
req->type = ix; |
574 |
req->fh = newSVsv (fh); |
575 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
576 |
|
577 |
send_req (req); |
578 |
} |
579 |
|
580 |
void |
581 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
582 |
SV * fh |
583 |
UV offset |
584 |
IV length |
585 |
SV * data |
586 |
IV dataoffset |
587 |
SV * callback |
588 |
ALIAS: |
589 |
aio_read = REQ_READ |
590 |
aio_write = REQ_WRITE |
591 |
PROTOTYPE: $$$$$;$ |
592 |
CODE: |
593 |
{ |
594 |
aio_req req; |
595 |
STRLEN svlen; |
596 |
char *svptr = SvPVbyte (data, svlen); |
597 |
|
598 |
SvUPGRADE (data, SVt_PV); |
599 |
SvPOK_on (data); |
600 |
|
601 |
if (dataoffset < 0) |
602 |
dataoffset += svlen; |
603 |
|
604 |
if (dataoffset < 0 || dataoffset > svlen) |
605 |
croak ("data offset outside of string"); |
606 |
|
607 |
if (ix == REQ_WRITE) |
608 |
{ |
609 |
/* write: check length and adjust. */ |
610 |
if (length < 0 || length + dataoffset > svlen) |
611 |
length = svlen - dataoffset; |
612 |
} |
613 |
else |
614 |
{ |
615 |
/* read: grow scalar as necessary */ |
616 |
svptr = SvGROW (data, length + dataoffset); |
617 |
} |
618 |
|
619 |
if (length < 0) |
620 |
croak ("length must not be negative"); |
621 |
|
622 |
{ |
623 |
dREQ; |
624 |
|
625 |
req->type = ix; |
626 |
req->fh = newSVsv (fh); |
627 |
req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) |
628 |
: IoOFP (sv_2io (fh))); |
629 |
req->offset = offset; |
630 |
req->length = length; |
631 |
req->data = SvREFCNT_inc (data); |
632 |
req->dataptr = (char *)svptr + dataoffset; |
633 |
|
634 |
send_req (req); |
635 |
} |
636 |
} |
637 |
|
638 |
void |
639 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
640 |
SV * fh |
641 |
UV offset |
642 |
IV length |
643 |
SV * callback |
644 |
PROTOTYPE: $$$;$ |
645 |
CODE: |
646 |
{ |
647 |
dREQ; |
648 |
|
649 |
req->type = REQ_READAHEAD; |
650 |
req->fh = newSVsv (fh); |
651 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
652 |
req->offset = offset; |
653 |
req->length = length; |
654 |
|
655 |
send_req (req); |
656 |
} |
657 |
|
658 |
void |
659 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
660 |
SV * fh_or_path |
661 |
SV * callback |
662 |
ALIAS: |
663 |
aio_stat = REQ_STAT |
664 |
aio_lstat = REQ_LSTAT |
665 |
CODE: |
666 |
{ |
667 |
dREQ; |
668 |
|
669 |
New (0, req->statdata, 1, Stat_t); |
670 |
if (!req->statdata) |
671 |
{ |
672 |
free_req (req); |
673 |
croak ("out of memory during aio_req->statdata allocation"); |
674 |
} |
675 |
|
676 |
if (SvPOK (fh_or_path)) |
677 |
{ |
678 |
req->type = ix; |
679 |
req->data = newSVsv (fh_or_path); |
680 |
req->dataptr = SvPVbyte_nolen (req->data); |
681 |
} |
682 |
else |
683 |
{ |
684 |
req->type = REQ_FSTAT; |
685 |
req->fh = newSVsv (fh_or_path); |
686 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
687 |
} |
688 |
|
689 |
send_req (req); |
690 |
} |
691 |
|
692 |
void |
693 |
aio_unlink(pathname,callback=&PL_sv_undef) |
694 |
SV * pathname |
695 |
SV * callback |
696 |
ALIAS: |
697 |
aio_unlink = REQ_UNLINK |
698 |
aio_rmdir = REQ_RMDIR |
699 |
CODE: |
700 |
{ |
701 |
dREQ; |
702 |
|
703 |
req->type = ix; |
704 |
req->data = newSVsv (pathname); |
705 |
req->dataptr = SvPVbyte_nolen (req->data); |
706 |
|
707 |
send_req (req); |
708 |
} |
709 |
|
710 |
void |
711 |
aio_symlink(oldpath,newpath,callback=&PL_sv_undef) |
712 |
SV * oldpath |
713 |
SV * newpath |
714 |
SV * callback |
715 |
CODE: |
716 |
{ |
717 |
dREQ; |
718 |
|
719 |
req->type = REQ_SYMLINK; |
720 |
req->fh = newSVsv (oldpath); |
721 |
req->data2ptr = SvPVbyte_nolen (req->fh); |
722 |
req->data = newSVsv (newpath); |
723 |
req->dataptr = SvPVbyte_nolen (req->data); |
724 |
|
725 |
send_req (req); |
726 |
} |
727 |
|
728 |
void |
729 |
flush() |
730 |
PROTOTYPE: |
731 |
CODE: |
732 |
while (nreqs) |
733 |
{ |
734 |
poll_wait (); |
735 |
poll_cb (); |
736 |
} |
737 |
|
738 |
void |
739 |
poll() |
740 |
PROTOTYPE: |
741 |
CODE: |
742 |
if (nreqs) |
743 |
{ |
744 |
poll_wait (); |
745 |
poll_cb (); |
746 |
} |
747 |
|
748 |
int |
749 |
poll_fileno() |
750 |
PROTOTYPE: |
751 |
CODE: |
752 |
RETVAL = respipe [0]; |
753 |
OUTPUT: |
754 |
RETVAL |
755 |
|
756 |
int |
757 |
poll_cb(...) |
758 |
PROTOTYPE: |
759 |
CODE: |
760 |
RETVAL = poll_cb (); |
761 |
OUTPUT: |
762 |
RETVAL |
763 |
|
764 |
void |
765 |
poll_wait() |
766 |
PROTOTYPE: |
767 |
CODE: |
768 |
if (nreqs) |
769 |
poll_wait (); |
770 |
|
771 |
int |
772 |
nreqs() |
773 |
PROTOTYPE: |
774 |
CODE: |
775 |
RETVAL = nreqs; |
776 |
OUTPUT: |
777 |
RETVAL |
778 |
|