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->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE)) |
148 |
SvREADONLY_off (req->data); |
149 |
|
150 |
if (req->statdata) |
151 |
{ |
152 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
153 |
PL_laststatval = req->result; |
154 |
PL_statcache = *(req->statdata); |
155 |
} |
156 |
|
157 |
ENTER; |
158 |
PUSHMARK (SP); |
159 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
160 |
|
161 |
if (req->type == REQ_OPEN) |
162 |
{ |
163 |
/* convert fd to fh */ |
164 |
SV *fh; |
165 |
|
166 |
PUTBACK; |
167 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
168 |
SPAGAIN; |
169 |
|
170 |
fh = SvREFCNT_inc (POPs); |
171 |
|
172 |
PUSHMARK (SP); |
173 |
XPUSHs (sv_2mortal (fh)); |
174 |
} |
175 |
|
176 |
if (SvOK (req->callback)) |
177 |
{ |
178 |
PUTBACK; |
179 |
call_sv (req->callback, G_VOID | G_EVAL); |
180 |
SPAGAIN; |
181 |
|
182 |
if (SvTRUE (ERRSV)) |
183 |
{ |
184 |
free_req (req); |
185 |
croak (0); |
186 |
} |
187 |
} |
188 |
|
189 |
LEAVE; |
190 |
|
191 |
errno = errorno; |
192 |
count++; |
193 |
} |
194 |
|
195 |
free_req (req); |
196 |
} |
197 |
|
198 |
return count; |
199 |
} |
200 |
|
201 |
static void *aio_proc(void *arg); |
202 |
|
203 |
static void |
204 |
start_thread (void) |
205 |
{ |
206 |
sigset_t fullsigset, oldsigset; |
207 |
pthread_t tid; |
208 |
pthread_attr_t attr; |
209 |
|
210 |
pthread_attr_init (&attr); |
211 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
212 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
213 |
|
214 |
sigfillset (&fullsigset); |
215 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
216 |
|
217 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
218 |
started++; |
219 |
|
220 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
221 |
} |
222 |
|
223 |
static void |
224 |
send_req (aio_req req) |
225 |
{ |
226 |
nreqs++; |
227 |
|
228 |
pthread_mutex_lock (&reqlock); |
229 |
|
230 |
req->next = 0; |
231 |
|
232 |
if (reqe) |
233 |
{ |
234 |
reqe->next = req; |
235 |
reqe = req; |
236 |
} |
237 |
else |
238 |
reqe = reqs = req; |
239 |
|
240 |
pthread_cond_signal (&reqwait); |
241 |
pthread_mutex_unlock (&reqlock); |
242 |
|
243 |
if (nreqs > max_outstanding) |
244 |
for (;;) |
245 |
{ |
246 |
poll_cb (); |
247 |
|
248 |
if (nreqs <= max_outstanding) |
249 |
break; |
250 |
|
251 |
poll_wait (); |
252 |
} |
253 |
} |
254 |
|
255 |
static void |
256 |
end_thread (void) |
257 |
{ |
258 |
aio_req req; |
259 |
Newz (0, req, 1, aio_cb); |
260 |
req->type = REQ_QUIT; |
261 |
|
262 |
send_req (req); |
263 |
} |
264 |
|
265 |
static void min_parallel (int nthreads) |
266 |
{ |
267 |
while (nthreads > started) |
268 |
start_thread (); |
269 |
} |
270 |
|
271 |
static void max_parallel (int nthreads) |
272 |
{ |
273 |
int cur = started; |
274 |
|
275 |
while (cur > nthreads) |
276 |
{ |
277 |
end_thread (); |
278 |
cur--; |
279 |
} |
280 |
|
281 |
while (started > nthreads) |
282 |
{ |
283 |
poll_wait (); |
284 |
poll_cb (); |
285 |
} |
286 |
} |
287 |
|
288 |
static void create_pipe () |
289 |
{ |
290 |
if (pipe (respipe)) |
291 |
croak ("unable to initialize result pipe"); |
292 |
|
293 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
294 |
croak ("cannot set result pipe to nonblocking mode"); |
295 |
|
296 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
297 |
croak ("cannot set result pipe to nonblocking mode"); |
298 |
} |
299 |
|
300 |
static void atfork_prepare (void) |
301 |
{ |
302 |
pthread_mutex_lock (&reqlock); |
303 |
pthread_mutex_lock (&reslock); |
304 |
} |
305 |
|
306 |
static void atfork_parent (void) |
307 |
{ |
308 |
pthread_mutex_unlock (&reslock); |
309 |
pthread_mutex_unlock (&reqlock); |
310 |
} |
311 |
|
312 |
static void atfork_child (void) |
313 |
{ |
314 |
aio_req prv; |
315 |
|
316 |
int restart = started; |
317 |
started = 0; |
318 |
|
319 |
while (reqs) |
320 |
{ |
321 |
prv = reqs; |
322 |
reqs = prv->next; |
323 |
free_req (prv); |
324 |
} |
325 |
|
326 |
reqs = reqe = 0; |
327 |
|
328 |
while (ress) |
329 |
{ |
330 |
prv = ress; |
331 |
ress = prv->next; |
332 |
free_req (prv); |
333 |
} |
334 |
|
335 |
ress = rese = 0; |
336 |
|
337 |
atfork_parent (); |
338 |
|
339 |
min_parallel (restart); |
340 |
} |
341 |
|
342 |
/*****************************************************************************/ |
343 |
/* work around various missing functions */ |
344 |
|
345 |
#if !HAVE_PREADWRITE |
346 |
# define pread aio_pread |
347 |
# define pwrite aio_pwrite |
348 |
|
349 |
/* |
350 |
* make our pread/pwrite safe against themselves, but not against |
351 |
* normal read/write by using a mutex. slows down execution a lot, |
352 |
* but that's your problem, not mine. |
353 |
*/ |
354 |
static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
355 |
|
356 |
static ssize_t |
357 |
pread (int fd, void *buf, size_t count, off_t offset) |
358 |
{ |
359 |
ssize_t res; |
360 |
off_t ooffset; |
361 |
|
362 |
pthread_mutex_lock (&iolock); |
363 |
ooffset = lseek (fd, 0, SEEK_CUR); |
364 |
lseek (fd, offset, SEEK_SET); |
365 |
res = read (fd, buf, count); |
366 |
lseek (fd, ooffset, SEEK_SET); |
367 |
pthread_mutex_unlock (&iolock); |
368 |
|
369 |
return res; |
370 |
} |
371 |
|
372 |
static ssize_t |
373 |
pwrite (int fd, void *buf, size_t count, off_t offset) |
374 |
{ |
375 |
ssize_t res; |
376 |
off_t ooffset; |
377 |
|
378 |
pthread_mutex_lock (&iolock); |
379 |
ooffset = lseek (fd, 0, SEEK_CUR); |
380 |
lseek (fd, offset, SEEK_SET); |
381 |
res = write (fd, buf, count); |
382 |
lseek (fd, offset, SEEK_SET); |
383 |
pthread_mutex_unlock (&iolock); |
384 |
|
385 |
return res; |
386 |
} |
387 |
#endif |
388 |
|
389 |
#if !HAVE_FDATASYNC |
390 |
# define fdatasync fsync |
391 |
#endif |
392 |
|
393 |
#if !HAVE_READAHEAD |
394 |
# define readahead aio_readahead |
395 |
|
396 |
static char readahead_buf[4096]; |
397 |
|
398 |
static ssize_t |
399 |
readahead (int fd, off_t offset, size_t count) |
400 |
{ |
401 |
while (count > 0) |
402 |
{ |
403 |
size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
404 |
|
405 |
pread (fd, readahead_buf, len, offset); |
406 |
offset += len; |
407 |
count -= len; |
408 |
} |
409 |
|
410 |
errno = 0; |
411 |
} |
412 |
#endif |
413 |
|
414 |
/*****************************************************************************/ |
415 |
|
416 |
static void * |
417 |
aio_proc (void *thr_arg) |
418 |
{ |
419 |
aio_req req; |
420 |
int type; |
421 |
|
422 |
do |
423 |
{ |
424 |
pthread_mutex_lock (&reqlock); |
425 |
|
426 |
for (;;) |
427 |
{ |
428 |
req = reqs; |
429 |
|
430 |
if (reqs) |
431 |
{ |
432 |
reqs = reqs->next; |
433 |
if (!reqs) reqe = 0; |
434 |
} |
435 |
|
436 |
if (req) |
437 |
break; |
438 |
|
439 |
pthread_cond_wait (&reqwait, &reqlock); |
440 |
} |
441 |
|
442 |
pthread_mutex_unlock (&reqlock); |
443 |
|
444 |
errno = 0; /* strictly unnecessary */ |
445 |
|
446 |
type = req->type; |
447 |
|
448 |
switch (type) |
449 |
{ |
450 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
451 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
452 |
|
453 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
454 |
|
455 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
456 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
457 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
458 |
|
459 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
460 |
case REQ_CLOSE: req->result = close (req->fd); break; |
461 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
462 |
case REQ_RMDIR: req->result = rmdir (req->dataptr); break; |
463 |
case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break; |
464 |
|
465 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
466 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
467 |
|
468 |
case REQ_QUIT: |
469 |
break; |
470 |
|
471 |
default: |
472 |
req->result = ENOSYS; |
473 |
break; |
474 |
} |
475 |
|
476 |
req->errorno = errno; |
477 |
|
478 |
pthread_mutex_lock (&reslock); |
479 |
|
480 |
req->next = 0; |
481 |
|
482 |
if (rese) |
483 |
{ |
484 |
rese->next = req; |
485 |
rese = req; |
486 |
} |
487 |
else |
488 |
{ |
489 |
rese = ress = req; |
490 |
|
491 |
/* write a dummy byte to the pipe so fh becomes ready */ |
492 |
write (respipe [1], &respipe, 1); |
493 |
} |
494 |
|
495 |
pthread_mutex_unlock (&reslock); |
496 |
} |
497 |
while (type != REQ_QUIT); |
498 |
|
499 |
return 0; |
500 |
} |
501 |
|
502 |
#define dREQ \ |
503 |
aio_req req; \ |
504 |
\ |
505 |
if (SvOK (callback) && !SvROK (callback)) \ |
506 |
croak ("clalback must be undef or of reference type"); \ |
507 |
\ |
508 |
Newz (0, req, 1, aio_cb); \ |
509 |
if (!req) \ |
510 |
croak ("out of memory during aio_req allocation"); \ |
511 |
\ |
512 |
req->callback = newSVsv (callback); |
513 |
|
514 |
MODULE = IO::AIO PACKAGE = IO::AIO |
515 |
|
516 |
PROTOTYPES: ENABLE |
517 |
|
518 |
BOOT: |
519 |
{ |
520 |
create_pipe (); |
521 |
pthread_atfork (atfork_prepare, atfork_parent, atfork_child); |
522 |
} |
523 |
|
524 |
void |
525 |
min_parallel(nthreads) |
526 |
int nthreads |
527 |
PROTOTYPE: $ |
528 |
|
529 |
void |
530 |
max_parallel(nthreads) |
531 |
int nthreads |
532 |
PROTOTYPE: $ |
533 |
|
534 |
int |
535 |
max_outstanding(nreqs) |
536 |
int nreqs |
537 |
PROTOTYPE: $ |
538 |
CODE: |
539 |
RETVAL = max_outstanding; |
540 |
max_outstanding = nreqs; |
541 |
|
542 |
void |
543 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
544 |
SV * pathname |
545 |
int flags |
546 |
int mode |
547 |
SV * callback |
548 |
PROTOTYPE: $$$;$ |
549 |
CODE: |
550 |
{ |
551 |
dREQ; |
552 |
|
553 |
req->type = REQ_OPEN; |
554 |
req->data = newSVsv (pathname); |
555 |
req->dataptr = SvPVbyte_nolen (req->data); |
556 |
req->fd = flags; |
557 |
req->mode = mode; |
558 |
|
559 |
send_req (req); |
560 |
} |
561 |
|
562 |
void |
563 |
aio_close(fh,callback=&PL_sv_undef) |
564 |
SV * fh |
565 |
SV * callback |
566 |
PROTOTYPE: $;$ |
567 |
ALIAS: |
568 |
aio_close = REQ_CLOSE |
569 |
aio_fsync = REQ_FSYNC |
570 |
aio_fdatasync = REQ_FDATASYNC |
571 |
CODE: |
572 |
{ |
573 |
dREQ; |
574 |
|
575 |
req->type = ix; |
576 |
req->fh = newSVsv (fh); |
577 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
578 |
|
579 |
send_req (req); |
580 |
} |
581 |
|
582 |
void |
583 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
584 |
SV * fh |
585 |
UV offset |
586 |
IV length |
587 |
SV * data |
588 |
IV dataoffset |
589 |
SV * callback |
590 |
ALIAS: |
591 |
aio_read = REQ_READ |
592 |
aio_write = REQ_WRITE |
593 |
PROTOTYPE: $$$$$;$ |
594 |
CODE: |
595 |
{ |
596 |
aio_req req; |
597 |
STRLEN svlen; |
598 |
char *svptr = SvPVbyte (data, svlen); |
599 |
|
600 |
SvUPGRADE (data, SVt_PV); |
601 |
SvPOK_on (data); |
602 |
|
603 |
if (dataoffset < 0) |
604 |
dataoffset += svlen; |
605 |
|
606 |
if (dataoffset < 0 || dataoffset > svlen) |
607 |
croak ("data offset outside of string"); |
608 |
|
609 |
if (ix == REQ_WRITE) |
610 |
{ |
611 |
/* write: check length and adjust. */ |
612 |
if (length < 0 || length + dataoffset > svlen) |
613 |
length = svlen - dataoffset; |
614 |
} |
615 |
else |
616 |
{ |
617 |
/* read: grow scalar as necessary */ |
618 |
svptr = SvGROW (data, length + dataoffset); |
619 |
} |
620 |
|
621 |
if (length < 0) |
622 |
croak ("length must not be negative"); |
623 |
|
624 |
{ |
625 |
dREQ; |
626 |
|
627 |
req->type = ix; |
628 |
req->fh = newSVsv (fh); |
629 |
req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) |
630 |
: IoOFP (sv_2io (fh))); |
631 |
req->offset = offset; |
632 |
req->length = length; |
633 |
req->data = SvREFCNT_inc (data); |
634 |
req->dataptr = (char *)svptr + dataoffset; |
635 |
|
636 |
if (!SvREADONLY (data)) |
637 |
{ |
638 |
SvREADONLY_on (data); |
639 |
req->data2ptr = (void *)data; |
640 |
} |
641 |
|
642 |
send_req (req); |
643 |
} |
644 |
} |
645 |
|
646 |
void |
647 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
648 |
SV * fh |
649 |
UV offset |
650 |
IV length |
651 |
SV * callback |
652 |
PROTOTYPE: $$$;$ |
653 |
CODE: |
654 |
{ |
655 |
dREQ; |
656 |
|
657 |
req->type = REQ_READAHEAD; |
658 |
req->fh = newSVsv (fh); |
659 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); |
660 |
req->offset = offset; |
661 |
req->length = length; |
662 |
|
663 |
send_req (req); |
664 |
} |
665 |
|
666 |
void |
667 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
668 |
SV * fh_or_path |
669 |
SV * callback |
670 |
ALIAS: |
671 |
aio_stat = REQ_STAT |
672 |
aio_lstat = REQ_LSTAT |
673 |
CODE: |
674 |
{ |
675 |
dREQ; |
676 |
|
677 |
New (0, req->statdata, 1, Stat_t); |
678 |
if (!req->statdata) |
679 |
{ |
680 |
free_req (req); |
681 |
croak ("out of memory during aio_req->statdata allocation"); |
682 |
} |
683 |
|
684 |
if (SvPOK (fh_or_path)) |
685 |
{ |
686 |
req->type = ix; |
687 |
req->data = newSVsv (fh_or_path); |
688 |
req->dataptr = SvPVbyte_nolen (req->data); |
689 |
} |
690 |
else |
691 |
{ |
692 |
req->type = REQ_FSTAT; |
693 |
req->fh = newSVsv (fh_or_path); |
694 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
695 |
} |
696 |
|
697 |
send_req (req); |
698 |
} |
699 |
|
700 |
void |
701 |
aio_unlink(pathname,callback=&PL_sv_undef) |
702 |
SV * pathname |
703 |
SV * callback |
704 |
ALIAS: |
705 |
aio_unlink = REQ_UNLINK |
706 |
aio_rmdir = REQ_RMDIR |
707 |
CODE: |
708 |
{ |
709 |
dREQ; |
710 |
|
711 |
req->type = ix; |
712 |
req->data = newSVsv (pathname); |
713 |
req->dataptr = SvPVbyte_nolen (req->data); |
714 |
|
715 |
send_req (req); |
716 |
} |
717 |
|
718 |
void |
719 |
aio_symlink(oldpath,newpath,callback=&PL_sv_undef) |
720 |
SV * oldpath |
721 |
SV * newpath |
722 |
SV * callback |
723 |
CODE: |
724 |
{ |
725 |
dREQ; |
726 |
|
727 |
req->type = REQ_SYMLINK; |
728 |
req->fh = newSVsv (oldpath); |
729 |
req->data2ptr = SvPVbyte_nolen (req->fh); |
730 |
req->data = newSVsv (newpath); |
731 |
req->dataptr = SvPVbyte_nolen (req->data); |
732 |
|
733 |
send_req (req); |
734 |
} |
735 |
|
736 |
void |
737 |
flush() |
738 |
PROTOTYPE: |
739 |
CODE: |
740 |
while (nreqs) |
741 |
{ |
742 |
poll_wait (); |
743 |
poll_cb (); |
744 |
} |
745 |
|
746 |
void |
747 |
poll() |
748 |
PROTOTYPE: |
749 |
CODE: |
750 |
if (nreqs) |
751 |
{ |
752 |
poll_wait (); |
753 |
poll_cb (); |
754 |
} |
755 |
|
756 |
int |
757 |
poll_fileno() |
758 |
PROTOTYPE: |
759 |
CODE: |
760 |
RETVAL = respipe [0]; |
761 |
OUTPUT: |
762 |
RETVAL |
763 |
|
764 |
int |
765 |
poll_cb(...) |
766 |
PROTOTYPE: |
767 |
CODE: |
768 |
RETVAL = poll_cb (); |
769 |
OUTPUT: |
770 |
RETVAL |
771 |
|
772 |
void |
773 |
poll_wait() |
774 |
PROTOTYPE: |
775 |
CODE: |
776 |
if (nreqs) |
777 |
poll_wait (); |
778 |
|
779 |
int |
780 |
nreqs() |
781 |
PROTOTYPE: |
782 |
CODE: |
783 |
RETVAL = nreqs; |
784 |
OUTPUT: |
785 |
RETVAL |
786 |
|