1 |
#define PERL_NO_GET_CONTEXT |
2 |
|
3 |
#include "EXTERN.h" |
4 |
#include "perl.h" |
5 |
#include "XSUB.h" |
6 |
|
7 |
#include <sys/types.h> |
8 |
#include <sys/stat.h> |
9 |
#include <unistd.h> |
10 |
#include <fcntl.h> |
11 |
#include <signal.h> |
12 |
#include <sched.h> |
13 |
#include <endian.h> |
14 |
|
15 |
typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
16 |
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
17 |
typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
18 |
|
19 |
// 128 seems to be enough most everywhere. alpha needs 256. |
20 |
#define STACKSIZE (256 * sizeof (long)) |
21 |
|
22 |
enum { |
23 |
REQ_QUIT, |
24 |
REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, |
25 |
REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK |
26 |
}; |
27 |
|
28 |
typedef struct { |
29 |
char stack[STACKSIZE]; |
30 |
} aio_thread; |
31 |
|
32 |
typedef struct aio_cb { |
33 |
struct aio_cb *next; |
34 |
|
35 |
int type; |
36 |
aio_thread *thread; |
37 |
|
38 |
int fd; |
39 |
off_t offset; |
40 |
size_t length; |
41 |
ssize_t result; |
42 |
mode_t mode; /* open */ |
43 |
int errorno; |
44 |
SV *data, *callback; |
45 |
void *dataptr; |
46 |
STRLEN dataoffset; |
47 |
|
48 |
Stat_t *statdata; |
49 |
} aio_cb; |
50 |
|
51 |
typedef aio_cb *aio_req; |
52 |
|
53 |
static int started; |
54 |
static int nreqs; |
55 |
static int reqpipe[2], respipe[2]; |
56 |
|
57 |
static aio_req qs, qe; /* queue start, queue end */ |
58 |
|
59 |
static int aio_proc(void *arg); |
60 |
|
61 |
static void |
62 |
start_thread (void) |
63 |
{ |
64 |
aio_thread *thr; |
65 |
|
66 |
New (0, thr, 1, aio_thread); |
67 |
|
68 |
if (clone (aio_proc, |
69 |
&(thr->stack[STACKSIZE - sizeof (long)]), |
70 |
CLONE_VM|CLONE_FS|CLONE_FILES, |
71 |
thr) >= 0) |
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started++; |
73 |
else |
74 |
Safefree (thr); |
75 |
} |
76 |
|
77 |
static void |
78 |
send_reqs (void) |
79 |
{ |
80 |
/* this write is atomic */ |
81 |
while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs) |
82 |
{ |
83 |
qs = qs->next; |
84 |
if (!qs) qe = 0; |
85 |
} |
86 |
} |
87 |
|
88 |
static void |
89 |
send_req (aio_req req) |
90 |
{ |
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nreqs++; |
92 |
req->next = 0; |
93 |
|
94 |
if (qe) |
95 |
{ |
96 |
qe->next = req; |
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qe = req; |
98 |
} |
99 |
else |
100 |
qe = qs = req; |
101 |
|
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send_reqs (); |
103 |
} |
104 |
|
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static void |
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end_thread (void) |
107 |
{ |
108 |
aio_req req; |
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New (0, req, 1, aio_cb); |
110 |
req->type = REQ_QUIT; |
111 |
|
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send_req (req); |
113 |
} |
114 |
|
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static void |
116 |
read_write (pTHX_ |
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int dowrite, int fd, off_t offset, size_t length, |
118 |
SV *data, STRLEN dataoffset, SV *callback) |
119 |
{ |
120 |
aio_req req; |
121 |
STRLEN svlen; |
122 |
char *svptr = SvPV (data, svlen); |
123 |
|
124 |
SvUPGRADE (data, SVt_PV); |
125 |
SvPOK_on (data); |
126 |
|
127 |
if (dataoffset < 0) |
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dataoffset += svlen; |
129 |
|
130 |
if (dataoffset < 0 || dataoffset > svlen) |
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croak ("data offset outside of string"); |
132 |
|
133 |
if (dowrite) |
134 |
{ |
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/* write: check length and adjust. */ |
136 |
if (length < 0 || length + dataoffset > svlen) |
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length = svlen - dataoffset; |
138 |
} |
139 |
else |
140 |
{ |
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/* read: grow scalar as necessary */ |
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svptr = SvGROW (data, length + dataoffset); |
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} |
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|
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if (length < 0) |
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croak ("length must not be negative"); |
147 |
|
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Newz (0, req, 1, aio_cb); |
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|
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if (!req) |
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croak ("out of memory during aio_req allocation"); |
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|
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req->type = dowrite ? REQ_WRITE : REQ_READ; |
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req->fd = fd; |
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req->offset = offset; |
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req->length = length; |
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req->data = SvREFCNT_inc (data); |
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req->dataptr = (char *)svptr + dataoffset; |
159 |
req->callback = SvREFCNT_inc (callback); |
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|
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send_req (req); |
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} |
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|
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static void |
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poll_wait () |
166 |
{ |
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fd_set rfd; |
168 |
FD_ZERO(&rfd); |
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FD_SET(respipe[0], &rfd); |
170 |
|
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select (respipe[0] + 1, &rfd, 0, 0, 0); |
172 |
} |
173 |
|
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static int |
175 |
poll_cb (pTHX) |
176 |
{ |
177 |
dSP; |
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int count = 0; |
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aio_req req; |
180 |
|
181 |
while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
182 |
{ |
183 |
nreqs--; |
184 |
|
185 |
if (req->type == REQ_QUIT) |
186 |
{ |
187 |
Safefree (req->thread); |
188 |
started--; |
189 |
} |
190 |
else |
191 |
{ |
192 |
int errorno = errno; |
193 |
errno = req->errorno; |
194 |
|
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if (req->type == REQ_READ) |
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SvCUR_set (req->data, req->dataoffset |
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+ req->result > 0 ? req->result : 0); |
198 |
|
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if (req->data) |
200 |
SvREFCNT_dec (req->data); |
201 |
|
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if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
203 |
{ |
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PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
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PL_laststatval = req->result; |
206 |
PL_statcache = *(req->statdata); |
207 |
|
208 |
Safefree (req->statdata); |
209 |
} |
210 |
|
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PUSHMARK (SP); |
212 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
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PUTBACK; |
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call_sv (req->callback, G_VOID); |
215 |
SPAGAIN; |
216 |
|
217 |
if (req->callback) |
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SvREFCNT_dec (req->callback); |
219 |
|
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errno = errorno; |
221 |
count++; |
222 |
} |
223 |
|
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Safefree (req); |
225 |
} |
226 |
|
227 |
if (qs) |
228 |
send_reqs (); |
229 |
|
230 |
return count; |
231 |
} |
232 |
|
233 |
static sigset_t fullsigset; |
234 |
|
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#undef errno |
236 |
#include <asm/unistd.h> |
237 |
#include <sys/prctl.h> |
238 |
|
239 |
#if BYTE_ORDER == LITTLE_ENDIAN |
240 |
# define LONG_LONG_PAIR(HI, LO) LO, HI |
241 |
#elif BYTE_ORDER == BIG_ENDIAN |
242 |
# define LONG_LONG_PAIR(HI, LO) HI, LO |
243 |
#endif |
244 |
|
245 |
#if __alpha || __ia64 || __hppa || __v850__ |
246 |
# define stat kernelstat |
247 |
# define stat64 kernelstat64 |
248 |
# include <asm/stat.h> |
249 |
# undef stat |
250 |
# undef stat64 |
251 |
#else |
252 |
# define kernelstat stat |
253 |
# define kernelstat64 stat64 |
254 |
#endif |
255 |
|
256 |
#define COPY_STATDATA \ |
257 |
req->statdata->st_dev = statdata.st_dev; \ |
258 |
req->statdata->st_ino = statdata.st_ino; \ |
259 |
req->statdata->st_mode = statdata.st_mode; \ |
260 |
req->statdata->st_nlink = statdata.st_nlink; \ |
261 |
req->statdata->st_uid = statdata.st_uid; \ |
262 |
req->statdata->st_gid = statdata.st_gid; \ |
263 |
req->statdata->st_rdev = statdata.st_rdev; \ |
264 |
req->statdata->st_size = statdata.st_size; \ |
265 |
req->statdata->st_atime = statdata.st_atime; \ |
266 |
req->statdata->st_mtime = statdata.st_mtime; \ |
267 |
req->statdata->st_ctime = statdata.st_ctime; \ |
268 |
req->statdata->st_blksize = statdata.st_blksize; \ |
269 |
req->statdata->st_blocks = statdata.st_blocks; \ |
270 |
|
271 |
static int |
272 |
aio_proc (void *thr_arg) |
273 |
{ |
274 |
aio_thread *thr = thr_arg; |
275 |
aio_req req; |
276 |
int errno; |
277 |
|
278 |
/* this is very much kernel-specific :(:(:( */ |
279 |
/* we rely on gcc's ability to create closures. */ |
280 |
_syscall3(int,read,int,fd,char *,buf,size_t,count) |
281 |
_syscall3(int,write,int,fd,char *,buf,size_t,count) |
282 |
|
283 |
_syscall3(int,open,char *,pathname,int,flags,mode_t,mode) |
284 |
_syscall1(int,close,int,fd) |
285 |
|
286 |
#if __NR_pread64 |
287 |
_syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lh,unsigned int,offset_hl) |
288 |
_syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lh,unsigned int,offset_hl) |
289 |
#elif __NR_pread |
290 |
_syscall4(int,pread,int,fd,char *,buf,size_t,count,offset_t,offset) |
291 |
_syscall4(int,pwrite,int,fd,char *,buf,size_t,count,offset_t,offset) |
292 |
#else |
293 |
# error "neither pread nor pread64 defined" |
294 |
#endif |
295 |
|
296 |
|
297 |
#if __NR_stat64 |
298 |
_syscall2(int,stat64, const char *, filename, struct kernelstat64 *, buf) |
299 |
_syscall2(int,lstat64, const char *, filename, struct kernelstat64 *, buf) |
300 |
_syscall2(int,fstat64, int, fd, struct kernelstat64 *, buf) |
301 |
#elif __NR_stat |
302 |
_syscall2(int,stat, const char *, filename, struct kernelstat *, buf) |
303 |
_syscall2(int,lstat, const char *, filename, struct kernelstat *, buf) |
304 |
_syscall2(int,fstat, int, fd, struct kernelstat *, buf) |
305 |
#else |
306 |
# error "neither stat64 nor stat defined" |
307 |
#endif |
308 |
|
309 |
_syscall1(int,unlink, char *, filename); |
310 |
|
311 |
sigprocmask (SIG_SETMASK, &fullsigset, 0); |
312 |
prctl (PR_SET_PDEATHSIG, SIGKILL); |
313 |
|
314 |
/* then loop */ |
315 |
while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
316 |
{ |
317 |
req->thread = thr; |
318 |
errno = 0; /* strictly unnecessary */ |
319 |
|
320 |
switch (req->type) |
321 |
{ |
322 |
#if __NR_pread64 |
323 |
case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, |
324 |
LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break; |
325 |
case REQ_WRITE: req->result = pwrite64(req->fd, req->dataptr, req->length, |
326 |
LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break; |
327 |
#else |
328 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
329 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
330 |
#endif |
331 |
#if __NR_stat64 |
332 |
struct kernelstat64 statdata; |
333 |
case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break; |
334 |
case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break; |
335 |
case REQ_FSTAT: req->result = fstat64 (req->fd, &statdata); COPY_STATDATA; break; |
336 |
#else |
337 |
struct kernelstat statdata; |
338 |
case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break; |
339 |
case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break; |
340 |
case REQ_FSTAT: req->result = fstat (req->fd, &statdata); COPY_STATDATA; break; |
341 |
#endif |
342 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
343 |
case REQ_CLOSE: req->result = close (req->fd); break; |
344 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
345 |
|
346 |
case REQ_QUIT: |
347 |
default: |
348 |
write (respipe[1], (void *)&req, sizeof (req)); |
349 |
return 0; |
350 |
} |
351 |
|
352 |
req->errorno = errno; |
353 |
write (respipe[1], (void *)&req, sizeof (req)); |
354 |
} |
355 |
|
356 |
return 0; |
357 |
} |
358 |
|
359 |
MODULE = Linux::AIO PACKAGE = Linux::AIO |
360 |
|
361 |
BOOT: |
362 |
{ |
363 |
sigfillset (&fullsigset); |
364 |
sigdelset (&fullsigset, SIGTERM); |
365 |
sigdelset (&fullsigset, SIGQUIT); |
366 |
sigdelset (&fullsigset, SIGABRT); |
367 |
sigdelset (&fullsigset, SIGINT); |
368 |
|
369 |
if (pipe (reqpipe) || pipe (respipe)) |
370 |
croak ("unable to initialize request or result pipe"); |
371 |
|
372 |
if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK)) |
373 |
croak ("cannot set result pipe to nonblocking mode"); |
374 |
|
375 |
if (fcntl (respipe[0], F_SETFL, O_NONBLOCK)) |
376 |
croak ("cannot set result pipe to nonblocking mode"); |
377 |
} |
378 |
|
379 |
void |
380 |
min_parallel(nthreads) |
381 |
int nthreads |
382 |
PROTOTYPE: $ |
383 |
CODE: |
384 |
while (nthreads > started) |
385 |
start_thread (); |
386 |
|
387 |
void |
388 |
max_parallel(nthreads) |
389 |
int nthreads |
390 |
PROTOTYPE: $ |
391 |
CODE: |
392 |
int cur = started; |
393 |
while (cur > nthreads) |
394 |
{ |
395 |
end_thread (); |
396 |
cur--; |
397 |
} |
398 |
|
399 |
while (started > nthreads) |
400 |
{ |
401 |
poll_wait (); |
402 |
poll_cb (aTHX); |
403 |
} |
404 |
|
405 |
void |
406 |
aio_open(pathname,flags,mode,callback) |
407 |
SV * pathname |
408 |
int flags |
409 |
int mode |
410 |
SV * callback |
411 |
PROTOTYPE: $$$$ |
412 |
CODE: |
413 |
aio_req req; |
414 |
|
415 |
Newz (0, req, 1, aio_cb); |
416 |
|
417 |
if (!req) |
418 |
croak ("out of memory during aio_req allocation"); |
419 |
|
420 |
req->type = REQ_OPEN; |
421 |
req->data = newSVsv (pathname); |
422 |
req->dataptr = SvPV_nolen (req->data); |
423 |
req->fd = flags; |
424 |
req->mode = mode; |
425 |
req->callback = SvREFCNT_inc (callback); |
426 |
|
427 |
send_req (req); |
428 |
|
429 |
void |
430 |
aio_close(fh,callback) |
431 |
InputStream fh |
432 |
SV * callback |
433 |
PROTOTYPE: $$ |
434 |
CODE: |
435 |
aio_req req; |
436 |
|
437 |
Newz (0, req, 1, aio_cb); |
438 |
|
439 |
if (!req) |
440 |
croak ("out of memory during aio_req allocation"); |
441 |
|
442 |
req->type = REQ_CLOSE; |
443 |
req->fd = PerlIO_fileno (fh); |
444 |
req->callback = SvREFCNT_inc (callback); |
445 |
|
446 |
send_req (req); |
447 |
|
448 |
void |
449 |
aio_read(fh,offset,length,data,dataoffset,callback) |
450 |
InputStream fh |
451 |
UV offset |
452 |
IV length |
453 |
SV * data |
454 |
IV dataoffset |
455 |
SV * callback |
456 |
PROTOTYPE: $$$$$$ |
457 |
CODE: |
458 |
read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
459 |
|
460 |
void |
461 |
aio_write(fh,offset,length,data,dataoffset,callback) |
462 |
OutputStream fh |
463 |
UV offset |
464 |
IV length |
465 |
SV * data |
466 |
IV dataoffset |
467 |
SV * callback |
468 |
PROTOTYPE: $$$$$$ |
469 |
CODE: |
470 |
read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
471 |
|
472 |
void |
473 |
aio_stat(fh_or_path,callback) |
474 |
SV * fh_or_path |
475 |
SV * callback |
476 |
PROTOTYPE: $$ |
477 |
ALIAS: |
478 |
aio_lstat = 1 |
479 |
CODE: |
480 |
aio_req req; |
481 |
|
482 |
Newz (0, req, 1, aio_cb); |
483 |
|
484 |
if (!req) |
485 |
croak ("out of memory during aio_req allocation"); |
486 |
|
487 |
New (0, req->statdata, 1, Stat_t); |
488 |
|
489 |
if (!req->statdata) |
490 |
croak ("out of memory during aio_req->statdata allocation"); |
491 |
|
492 |
if (SvPOK (fh_or_path)) |
493 |
{ |
494 |
req->type = ix ? REQ_LSTAT : REQ_STAT; |
495 |
req->data = newSVsv (fh_or_path); |
496 |
req->dataptr = SvPV_nolen (req->data); |
497 |
} |
498 |
else |
499 |
{ |
500 |
req->type = REQ_FSTAT; |
501 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
502 |
} |
503 |
|
504 |
req->callback = SvREFCNT_inc (callback); |
505 |
|
506 |
send_req (req); |
507 |
|
508 |
void |
509 |
aio_unlink(pathname,callback) |
510 |
SV * pathname |
511 |
SV * callback |
512 |
PROTOTYPE: $$ |
513 |
CODE: |
514 |
aio_req req; |
515 |
|
516 |
Newz (0, req, 1, aio_cb); |
517 |
|
518 |
if (!req) |
519 |
croak ("out of memory during aio_req allocation"); |
520 |
|
521 |
req->type = REQ_UNLINK; |
522 |
req->data = newSVsv (pathname); |
523 |
req->dataptr = SvPV_nolen (req->data); |
524 |
req->callback = SvREFCNT_inc (callback); |
525 |
|
526 |
send_req (req); |
527 |
|
528 |
int |
529 |
poll_fileno() |
530 |
PROTOTYPE: |
531 |
CODE: |
532 |
RETVAL = respipe[0]; |
533 |
OUTPUT: |
534 |
RETVAL |
535 |
|
536 |
int |
537 |
poll_cb(...) |
538 |
PROTOTYPE: |
539 |
CODE: |
540 |
RETVAL = poll_cb (aTHX); |
541 |
OUTPUT: |
542 |
RETVAL |
543 |
|
544 |
void |
545 |
poll_wait() |
546 |
PROTOTYPE: |
547 |
CODE: |
548 |
poll_wait (); |
549 |
|
550 |
int |
551 |
nreqs() |
552 |
PROTOTYPE: |
553 |
CODE: |
554 |
RETVAL = nreqs; |
555 |
OUTPUT: |
556 |
RETVAL |
557 |
|