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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.27 by root, Wed Aug 17 04:47:02 2005 UTC vs.
Revision 1.115 by root, Sat May 10 18:06:41 2008 UTC

1#define _REENTRANT 1 1#include "libeio/xthread.h"
2
2#include <errno.h> 3#include <errno.h>
3 4
4#include "EXTERN.h" 5#include "EXTERN.h"
5#include "perl.h" 6#include "perl.h"
6#include "XSUB.h" 7#include "XSUB.h"
7 8
8#include "autoconf/config.h" 9#include <stddef.h>
9 10#include <stdlib.h>
11#include <errno.h>
10#include <sys/types.h> 12#include <sys/types.h>
11#include <sys/stat.h> 13#include <sys/stat.h>
12
13#include <unistd.h> 14#include <limits.h>
14#include <fcntl.h> 15#include <fcntl.h>
15#include <signal.h>
16#include <sched.h> 16#include <sched.h>
17 17
18#include <pthread.h> 18#ifdef _WIN32
19 19
20typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ 20# define EIO_STRUCT_DIRENT Direntry_t
21typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ 21# undef malloc
22typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ 22# undef free
23 23
24#if __ia64 24// perl overrides all those nice win32 functions
25# define STACKSIZE 65536 25# undef open
26# undef read
27# undef write
28# undef send
29# undef recv
30# undef stat
31# undef fstat
32# define lstat stat
33# undef truncate
34# undef ftruncate
35# undef open
36# undef close
37# undef unlink
38# undef rmdir
39# undef rename
40# undef lseek
41
42# define chown(a,b,c) (errno = ENOSYS, -1)
43# define fchown(a,b,c) (errno = ENOSYS, -1)
44# define fchmod(a,b) (errno = ENOSYS, -1)
45# define symlink(a,b) (errno = ENOSYS, -1)
46# define readlink(a,b,c) (errno = ENOSYS, -1)
47# define mknod(a,b,c) (errno = ENOSYS, -1)
48# define truncate(a,b) (errno = ENOSYS, -1)
49# define ftruncate(fd,o) chsize ((fd), (o))
50# define fsync(fd) _commit (fd)
51# define opendir(fd) (errno = ENOSYS, 0)
52# define readdir(fd) (errno = ENOSYS, -1)
53# define closedir(fd) (errno = ENOSYS, -1)
54# define mkdir(a,b) mkdir (a)
55
26#else 56#else
27# define STACKSIZE 4096 57
58# include <sys/time.h>
59# include <sys/select.h>
60# include <unistd.h>
61# include <utime.h>
62# include <signal.h>
63# define EIO_STRUCT_DIRENT struct dirent
64
28#endif 65#endif
29 66
67#define EIO_STRUCT_STAT Stat_t
68
69/* use NV for 32 bit perls as it allows larger offsets */
70#if IVSIZE >= 8
71# define SvVAL64 SvIV
72#else
73# define SvVAL64 SvNV
74#endif
75
76static HV *stash;
77typedef SV SV8; /* byte-sv, used for argument-checking */
78
79#define AIO_REQ_KLASS "IO::AIO::REQ"
80#define AIO_GRP_KLASS "IO::AIO::GRP"
81
82#define EIO_COMMON \
83 SV *callback; \
84 SV *sv1, *sv2; \
85 STRLEN stroffset; \
86 SV *self
87
88#include "libeio/eio.h"
89
90static int req_invoke (eio_req *req);
91#define EIO_FINISH(req) req_invoke (req)
92static void aio_grp_feed (eio_req *grp);
93#define EIO_FEED(req) aio_grp_feed (req)
94static void req_destroy (eio_req *grp);
95#define EIO_DESTROY(req) req_destroy (req)
96
30enum { 97enum {
31 REQ_QUIT, 98 FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
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}; 99};
39 100
40typedef struct aio_cb { 101#include "libeio/eio.c"
41 struct aio_cb *volatile next;
42 102
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
58typedef aio_cb *aio_req; 103typedef eio_req *aio_req;
104typedef eio_req *aio_req_ornot;
59 105
60static int started; 106static unsigned int max_outstanding = 0x7fffffff;
61static volatile int nreqs;
62static int max_outstanding = 1<<30;
63static int respipe [2];
64 107
65static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; 108static int next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS;
66static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
67static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
68 109
69static volatile aio_req reqs, reqe; /* queue start, queue end */ 110static int respipe_osf [2], respipe [2] = { -1, -1 };
70static volatile aio_req ress, rese; /* queue start, queue end */
71 111
112static void req_destroy (aio_req req);
72static void free_req (aio_req req) 113static void req_cancel (aio_req req);
73{
74 if (req->data)
75 SvREFCNT_dec (req->data);
76 114
115static void want_poll (void)
116{
117 /* write a dummy byte to the pipe so fh becomes ready */
118 respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
119}
120
121static void done_poll (void)
122{
123 /* read any signals sent by the worker threads */
124 char buf [4];
125 while (respipe_read (respipe [0], buf, 4) == 4)
126 ;
127}
128
129/* must be called at most once */
130static SV *req_sv (aio_req req, const char *klass)
131{
77 if (req->fh) 132 if (!req->self)
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
89static void
90poll_wait ()
91{
92 if (nreqs && !ress)
93 { 133 {
94 fd_set rfd; 134 req->self = (SV *)newHV ();
95 FD_ZERO(&rfd); 135 sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
96 FD_SET(respipe [0], &rfd);
97
98 select (respipe [0] + 1, &rfd, 0, 0, 0);
99 } 136 }
100}
101 137
102static int 138 return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
103poll_cb () 139}
140
141static aio_req SvAIO_REQ (SV *sv)
142{
143 MAGIC *mg;
144
145 if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
146 croak ("object of class " AIO_REQ_KLASS " expected");
147
148 mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
149
150 return mg ? (aio_req)mg->mg_ptr : 0;
151}
152
153static void aio_grp_feed (aio_req grp)
154{
155 if (grp->sv2 && SvOK (grp->sv2))
156 {
157 dSP;
158
159 ENTER;
160 SAVETMPS;
161 PUSHMARK (SP);
162 XPUSHs (req_sv (grp, AIO_GRP_KLASS));
163 PUTBACK;
164 call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
165 SPAGAIN;
166 FREETMPS;
167 LEAVE;
168 }
169}
170
171static int req_invoke (eio_req *req)
104{ 172{
105 dSP; 173 dSP;
106 int count = 0;
107 int do_croak = 0;
108 aio_req req;
109 174
110 for (;;) 175 if (req->flags & FLAG_SV2_RO_OFF)
176 SvREADONLY_off (req->sv2);
177
178 if (!EIO_CANCELLED (req) && SvOK (req->callback))
111 { 179 {
112 pthread_mutex_lock (&reslock); 180 ENTER;
113 req = ress; 181 SAVETMPS;
182 PUSHMARK (SP);
183 EXTEND (SP, 1);
114 184
115 if (req) 185 switch (req->type)
116 { 186 {
117 ress = req->next; 187 case EIO_READDIR:
118
119 if (!ress)
120 { 188 {
121 rese = 0; 189 SV *rv = &PL_sv_undef;
122 190
123 /* read any signals sent by the worker threads */ 191 if (req->result >= 0)
124 char buf [32];
125 while (read (respipe [0], buf, 32) == 32)
126 ; 192 {
193 int i;
194 char *buf = req->ptr2;
195 AV *av = newAV ();
196
197 av_extend (av, req->result - 1);
198
199 for (i = 0; i < req->result; ++i)
200 {
201 SV *sv = newSVpv (buf, 0);
202
203 av_store (av, i, sv);
204 buf += SvCUR (sv) + 1;
205 }
206
207 rv = sv_2mortal (newRV_noinc ((SV *)av));
208 }
209
210 PUSHs (rv);
127 } 211 }
128 }
129
130 pthread_mutex_unlock (&reslock);
131
132 if (!req)
133 break; 212 break;
134 213
135 nreqs--; 214 case EIO_OPEN:
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 { 215 {
160 /* convert fd to fh */ 216 /* convert fd to fh */
161 SV *fh; 217 SV *fh = &PL_sv_undef;
162 218
163 PUTBACK; 219 if (req->result >= 0)
164 call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); 220 {
165 SPAGAIN; 221 GV *gv = (GV *)sv_newmortal ();
222 int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
223 char sym [64];
224 int symlen;
225
226 symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
227 gv_init (gv, stash, sym, symlen, 0);
166 228
167 fh = SvREFCNT_inc (POPs); 229 symlen = snprintf (
230 sym,
231 sizeof (sym),
232 "%s&=%d",
233 flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
234 req->result
235 );
168 236
237 if (do_open (gv, sym, symlen, 0, 0, 0, 0))
238 fh = (SV *)gv;
239 }
240
169 PUSHMARK (SP); 241 PUSHs (fh);
170 XPUSHs (sv_2mortal (fh));
171 } 242 }
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
198static void *aio_proc(void *arg);
199
200static void
201start_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
220static void
221send_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
252static void
253end_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
262static void min_parallel (int nthreads)
263{
264 while (nthreads > started)
265 start_thread ();
266}
267
268static 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
285static 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
297static 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
324static void atfork_parent (void)
325{
326 pthread_mutex_unlock (&reslock);
327 pthread_mutex_unlock (&reqlock);
328}
329
330static 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 */
352static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
353
354static ssize_t
355pread (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
370static ssize_t
371pwrite (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
394static char readahead_buf[4096];
395
396static ssize_t
397readahead (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
414static void *
415aio_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; 243 break;
436 244
437 pthread_cond_wait (&reqwait, &reqlock); 245 case EIO_GROUP:
438 } 246 req->int1 = 2; /* mark group as finished */
439 247
440 pthread_mutex_unlock (&reqlock); 248 if (req->sv1)
441
442 errno = 0; /* strictly unnecessary */
443
444 type = req->type;
445
446 switch (type)
447 { 249 {
448 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; 250 int i;
449 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; 251 AV *av = (AV *)req->sv1;
450 252
451 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 253 EXTEND (SP, AvFILL (av) + 1);
452 254 for (i = 0; i <= AvFILL (av); ++i)
453 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 255 PUSHs (*av_fetch (av, i, 0));
454 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 256 }
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; 257 break;
468 258
259 case EIO_NOP:
260 case EIO_BUSY:
261 break;
262
263 case EIO_READLINK:
264 if (req->result > 0)
265 {
266 SvCUR_set (req->sv2, req->result);
267 *SvEND (req->sv2) = 0;
268 PUSHs (req->sv2);
269 }
270 break;
271
272 case EIO_STAT:
273 case EIO_LSTAT:
274 case EIO_FSTAT:
275 PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
276 PL_laststatval = req->result;
277 PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
278 PUSHs (sv_2mortal (newSViv (req->result)));
279 break;
280
281 case EIO_READ:
282 SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
283 *SvEND (req->sv2) = 0;
284 PUSHs (sv_2mortal (newSViv (req->result)));
285 break;
286
287 case EIO_DUP2:
288 if (req->result > 0)
289 req->result = 0;
290 /* FALLTHROUGH */
291
469 default: 292 default:
470 req->result = ENOSYS; 293 PUSHs (sv_2mortal (newSViv (req->result)));
471 break; 294 break;
472 } 295 }
473 296
474 req->errorno = errno; 297 errno = req->errorno;
475 298
476 pthread_mutex_lock (&reslock); 299 PUTBACK;
300 call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
301 SPAGAIN;
477 302
478 req->next = 0; 303 FREETMPS;
304 LEAVE;
479 305
480 if (rese) 306 PUTBACK;
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 } 307 }
495 while (type != REQ_QUIT);
496 308
309 return !!SvTRUE (ERRSV);
310}
311
312static void req_destroy (aio_req req)
313{
314 if (req->self)
315 {
316 sv_unmagic (req->self, PERL_MAGIC_ext);
317 SvREFCNT_dec (req->self);
318 }
319
320 SvREFCNT_dec (req->sv1);
321 SvREFCNT_dec (req->sv2);
322 SvREFCNT_dec (req->callback);
323
324 Safefree (req);
325}
326
327static void req_cancel_subs (aio_req grp)
328{
329 aio_req sub;
330
331 if (grp->type != EIO_GROUP)
332 return;
333
334 SvREFCNT_dec (grp->sv2);
335 grp->sv2 = 0;
336
337 eio_grp_cancel (grp);
338}
339
340#ifdef USE_SOCKETS_AS_HANDLES
341# define TO_SOCKET(x) (win32_get_osfhandle (x))
342#else
343# define TO_SOCKET(x) (x)
344#endif
345
346static void
347create_respipe (void)
348{
349 int old_readfd = respipe [0];
350
351 if (respipe [1] >= 0)
352 respipe_close (TO_SOCKET (respipe [1]));
353
354#ifdef _WIN32
355 if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
356#else
357 if (pipe (respipe))
358#endif
359 croak ("unable to initialize result pipe");
360
361 if (old_readfd >= 0)
362 {
363 if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
364 croak ("unable to initialize result pipe(2)");
365
366 respipe_close (respipe [0]);
367 respipe [0] = old_readfd;
368 }
369
370#ifdef _WIN32
371 int arg = 1;
372 if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
373 || ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
374#else
375 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
376 || fcntl (respipe [1], F_SETFL, O_NONBLOCK))
377#endif
378 croak ("unable to initialize result pipe(3)");
379
380 respipe_osf [0] = TO_SOCKET (respipe [0]);
381 respipe_osf [1] = TO_SOCKET (respipe [1]);
382}
383
384static void poll_wait (void)
385{
386 fd_set rfd;
387
388 while (eio_nreqs ())
389 {
390 int size;
391
392 X_LOCK (reslock);
393 size = res_queue.size;
394 X_UNLOCK (reslock);
395
396 if (size)
397 return;
398
399 maybe_start_thread ();
400
401 FD_ZERO (&rfd);
402 FD_SET (respipe [0], &rfd);
403
404 PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
405 }
406}
407
408static int poll_cb (void)
409{
410 int res = eio_poll ();
411
412 if (res > 0)
413 croak (0);
414
497 return 0; 415 return res;
498} 416}
499 417
500#define dREQ \ 418#define dREQ \
501 aio_req req; \ 419 aio_req req; \
420 int req_pri = next_pri; \
421 next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS; \
502 \ 422 \
503 if (SvOK (callback) && !SvROK (callback)) \ 423 if (SvOK (callback) && !SvROK (callback)) \
504 croak ("clalback must be undef or of reference type"); \ 424 croak ("callback must be undef or of reference type"); \
505 \ 425 \
506 Newz (0, req, 1, aio_cb); \ 426 Newz (0, req, 1, eio_req); \
507 if (!req) \ 427 if (!req) \
508 croak ("out of memory during aio_req allocation"); \ 428 croak ("out of memory during eio_req allocation"); \
509 \ 429 \
510 req->callback = newSVsv (callback); 430 req->callback = newSVsv (callback); \
431 req->pri = req_pri
432
433#define REQ_SEND \
434 eio_submit (req); \
435 \
436 if (GIMME_V != G_VOID) \
437 XPUSHs (req_sv (req, AIO_REQ_KLASS));
511 438
512MODULE = IO::AIO PACKAGE = IO::AIO 439MODULE = IO::AIO PACKAGE = IO::AIO
513 440
514PROTOTYPES: ENABLE 441PROTOTYPES: ENABLE
515 442
516BOOT: 443BOOT:
517{ 444{
518 create_pipe (); 445 stash = gv_stashpv ("IO::AIO", 1);
519 pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
520}
521 446
447 newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
448 newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
449 newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
450 newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
451 newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
452#ifdef _WIN32
453 X_MUTEX_CHECK (wrklock);
454 X_MUTEX_CHECK (reslock);
455 X_MUTEX_CHECK (reqlock);
456 X_MUTEX_CHECK (reqwait);
457 X_MUTEX_CHECK (preadwritelock);
458 X_MUTEX_CHECK (readdirlock);
459
460 X_COND_CHECK (reqwait);
461#else
462 newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
463#endif
464
465 create_respipe ();
466
467 if (eio_init (want_poll, done_poll) < 0)
468 croak ("IO::AIO: unable to initialise eio library");
469}
470
522void 471void
523min_parallel(nthreads) 472max_poll_reqs (int nreqs)
524 int nthreads
525 PROTOTYPE: $ 473 PROTOTYPE: $
474 CODE:
475 eio_set_max_poll_reqs (nreqs);
526 476
527void 477void
528max_parallel(nthreads) 478max_poll_time (double nseconds)
529 int nthreads
530 PROTOTYPE: $ 479 PROTOTYPE: $
531
532int
533max_outstanding(nreqs)
534 int nreqs
535 PROTOTYPE: $
536 CODE: 480 CODE:
537 RETVAL = max_outstanding; 481 eio_set_max_poll_time (nseconds);
482
483void
484min_parallel (int nthreads)
485 PROTOTYPE: $
486 CODE:
487 eio_set_min_parallel (nthreads);
488
489void
490max_parallel (int nthreads)
491 PROTOTYPE: $
492 CODE:
493 eio_set_max_parallel (nthreads);
494
495void
496max_idle (int nthreads)
497 PROTOTYPE: $
498 CODE:
499 eio_set_max_idle (nthreads);
500
501void
502max_outstanding (int maxreqs)
503 PROTOTYPE: $
504 CODE:
538 max_outstanding = nreqs; 505 max_outstanding = maxreqs;
539 506
540void 507void
541aio_open(pathname,flags,mode,callback=&PL_sv_undef) 508aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
542 SV * pathname
543 int flags
544 int mode
545 SV * callback
546 PROTOTYPE: $$$;$ 509 PROTOTYPE: $$$;$
547 CODE: 510 PPCODE:
548{ 511{
549 dREQ; 512 dREQ;
550 513
551 req->type = REQ_OPEN; 514 req->type = EIO_OPEN;
552 req->data = newSVsv (pathname); 515 req->sv1 = newSVsv (pathname);
553 req->dataptr = SvPVbyte_nolen (req->data); 516 req->ptr1 = SvPVbyte_nolen (req->sv1);
554 req->fd = flags; 517 req->int1 = flags;
555 req->mode = mode; 518 req->int2 = mode;
556 519
557 send_req (req); 520 REQ_SEND;
558} 521}
559 522
560void 523void
561aio_close(fh,callback=&PL_sv_undef) 524aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
562 SV * fh
563 SV * callback
564 PROTOTYPE: $;$ 525 PROTOTYPE: $;$
565 ALIAS: 526 ALIAS:
566 aio_close = REQ_CLOSE
567 aio_fsync = REQ_FSYNC 527 aio_fsync = EIO_FSYNC
568 aio_fdatasync = REQ_FDATASYNC 528 aio_fdatasync = EIO_FDATASYNC
569 CODE: 529 PPCODE:
570{ 530{
571 dREQ; 531 dREQ;
572 532
573 req->type = ix; 533 req->type = ix;
574 req->fh = newSVsv (fh); 534 req->sv1 = newSVsv (fh);
575 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 535 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
576 536
577 send_req (req); 537 REQ_SEND (req);
578} 538}
579 539
580void 540void
541aio_close (SV *fh, SV *callback=&PL_sv_undef)
542 PROTOTYPE: $;$
543 PPCODE:
544{
545 static int close_pipe = -1; /* dummy fd to close fds via dup2 */
546 dREQ;
547
548 if (close_pipe < 0)
549 {
550 int pipefd [2];
551
552 if (pipe (pipefd) < 0
553 || close (pipefd [1]) < 0
554 || fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
555 abort (); /*D*/
556
557 close_pipe = pipefd [0];
558 }
559
560 req->type = EIO_DUP2;
561 req->int1 = close_pipe;
562 req->sv2 = newSVsv (fh);
563 req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
564
565 REQ_SEND (req);
566}
567
568void
581aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) 569aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
582 SV * fh
583 UV offset
584 IV length
585 SV * data
586 IV dataoffset
587 SV * callback
588 ALIAS: 570 ALIAS:
589 aio_read = REQ_READ 571 aio_read = EIO_READ
590 aio_write = REQ_WRITE 572 aio_write = EIO_WRITE
591 PROTOTYPE: $$$$$;$ 573 PROTOTYPE: $$$$$;$
592 CODE: 574 PPCODE:
593{ 575{
594 aio_req req;
595 STRLEN svlen; 576 STRLEN svlen;
596 char *svptr = SvPVbyte (data, svlen); 577 char *svptr = SvPVbyte (data, svlen);
578 UV len = SvUV (length);
597 579
598 SvUPGRADE (data, SVt_PV); 580 SvUPGRADE (data, SVt_PV);
599 SvPOK_on (data); 581 SvPOK_on (data);
600 582
601 if (dataoffset < 0) 583 if (dataoffset < 0)
602 dataoffset += svlen; 584 dataoffset += svlen;
603 585
604 if (dataoffset < 0 || dataoffset > svlen) 586 if (dataoffset < 0 || dataoffset > svlen)
605 croak ("data offset outside of string"); 587 croak ("dataoffset outside of data scalar");
606 588
607 if (ix == REQ_WRITE) 589 if (ix == EIO_WRITE)
608 { 590 {
609 /* write: check length and adjust. */ 591 /* write: check length and adjust. */
610 if (length < 0 || length + dataoffset > svlen) 592 if (!SvOK (length) || len + dataoffset > svlen)
611 length = svlen - dataoffset; 593 len = svlen - dataoffset;
612 } 594 }
613 else 595 else
614 { 596 {
615 /* read: grow scalar as necessary */ 597 /* read: grow scalar as necessary */
616 svptr = SvGROW (data, length + dataoffset); 598 svptr = SvGROW (data, len + dataoffset + 1);
617 } 599 }
618 600
619 if (length < 0) 601 if (len < 0)
620 croak ("length must not be negative"); 602 croak ("length must not be negative");
621 603
622 { 604 {
623 dREQ; 605 dREQ;
624 606
625 req->type = ix; 607 req->type = ix;
626 req->fh = newSVsv (fh); 608 req->sv1 = newSVsv (fh);
627 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) 609 req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
628 : IoOFP (sv_2io (fh))); 610 : IoOFP (sv_2io (fh)));
611 req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
629 req->offset = offset; 612 req->size = len;
630 req->length = length;
631 req->data = SvREFCNT_inc (data); 613 req->sv2 = SvREFCNT_inc (data);
632 req->dataptr = (char *)svptr + dataoffset; 614 req->ptr2 = (char *)svptr + dataoffset;
615 req->stroffset = dataoffset;
633 616
634 send_req (req); 617 if (!SvREADONLY (data))
618 {
619 SvREADONLY_on (data);
620 req->flags |= FLAG_SV2_RO_OFF;
621 }
622
623 REQ_SEND;
635 } 624 }
636} 625}
637 626
638void 627void
628aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
629 PROTOTYPE: $$;$
630 PPCODE:
631{
632 SV *data;
633 dREQ;
634
635 data = newSV (NAME_MAX);
636 SvPOK_on (data);
637
638 req->type = EIO_READLINK;
639 req->sv1 = newSVsv (path);
640 req->ptr1 = SvPVbyte_nolen (req->sv1);
641 req->sv2 = data;
642 req->ptr2 = SvPVbyte_nolen (data);
643
644 REQ_SEND;
645}
646
647void
648aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
649 PROTOTYPE: $$$$;$
650 PPCODE:
651{
652 dREQ;
653
654 req->type = EIO_SENDFILE;
655 req->sv1 = newSVsv (out_fh);
656 req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
657 req->sv2 = newSVsv (in_fh);
658 req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
659 req->offs = SvVAL64 (in_offset);
660 req->size = length;
661
662 REQ_SEND;
663}
664
665void
639aio_readahead(fh,offset,length,callback=&PL_sv_undef) 666aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
640 SV * fh
641 UV offset
642 IV length
643 SV * callback
644 PROTOTYPE: $$$;$ 667 PROTOTYPE: $$$;$
645 CODE: 668 PPCODE:
646{ 669{
647 dREQ; 670 dREQ;
648 671
649 req->type = REQ_READAHEAD; 672 req->type = EIO_READAHEAD;
650 req->fh = newSVsv (fh); 673 req->sv1 = newSVsv (fh);
651 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 674 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
652 req->offset = offset; 675 req->offs = SvVAL64 (offset);
653 req->length = length; 676 req->size = length;
654 677
655 send_req (req); 678 REQ_SEND;
656} 679}
657 680
658void 681void
659aio_stat(fh_or_path,callback=&PL_sv_undef) 682aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
660 SV * fh_or_path
661 SV * callback
662 ALIAS: 683 ALIAS:
663 aio_stat = REQ_STAT 684 aio_stat = EIO_STAT
664 aio_lstat = REQ_LSTAT 685 aio_lstat = EIO_LSTAT
665 CODE: 686 PPCODE:
666{ 687{
667 dREQ; 688 dREQ;
668 689
669 New (0, req->statdata, 1, Stat_t); 690 req->ptr2 = malloc (sizeof (EIO_STRUCT_STAT));
670 if (!req->statdata) 691 if (!req->ptr2)
671 { 692 {
672 free_req (req); 693 req_destroy (req);
673 croak ("out of memory during aio_req->statdata allocation"); 694 croak ("out of memory during aio_stat statdata allocation");
674 } 695 }
696
697 req->flags |= EIO_FLAG_PTR2_FREE;
698 req->sv1 = newSVsv (fh_or_path);
675 699
676 if (SvPOK (fh_or_path)) 700 if (SvPOK (fh_or_path))
677 { 701 {
678 req->type = ix; 702 req->type = ix;
679 req->data = newSVsv (fh_or_path);
680 req->dataptr = SvPVbyte_nolen (req->data); 703 req->ptr1 = SvPVbyte_nolen (req->sv1);
681 } 704 }
682 else 705 else
683 { 706 {
684 req->type = REQ_FSTAT; 707 req->type = EIO_FSTAT;
685 req->fh = newSVsv (fh_or_path);
686 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); 708 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
709 }
710
711 REQ_SEND;
712}
713
714void
715aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
716 PPCODE:
717{
718 dREQ;
719
720 req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
721 req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
722 req->sv1 = newSVsv (fh_or_path);
723
724 if (SvPOK (fh_or_path))
687 } 725 {
726 req->type = EIO_UTIME;
727 req->ptr1 = SvPVbyte_nolen (req->sv1);
728 }
729 else
730 {
731 req->type = EIO_FUTIME;
732 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
733 }
688 734
689 send_req (req); 735 REQ_SEND;
690} 736}
691 737
692void 738void
739aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
740 PPCODE:
741{
742 dREQ;
743
744 req->sv1 = newSVsv (fh_or_path);
745 req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
746
747 if (SvPOK (fh_or_path))
748 {
749 req->type = EIO_TRUNCATE;
750 req->ptr1 = SvPVbyte_nolen (req->sv1);
751 }
752 else
753 {
754 req->type = EIO_FTRUNCATE;
755 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
756 }
757
758 REQ_SEND;
759}
760
761void
762aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
763 ALIAS:
764 aio_chmod = EIO_CHMOD
765 aio_fchmod = EIO_FCHMOD
766 aio_mkdir = EIO_MKDIR
767 PPCODE:
768{
769 dREQ;
770
771 req->type = ix;
772 req->int2 = mode;
773 req->sv1 = newSVsv (fh_or_path);
774
775 if (ix == EIO_FCHMOD)
776 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
777 else
778 req->ptr1 = SvPVbyte_nolen (req->sv1);
779
780 REQ_SEND;
781}
782
783void
784aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
785 PPCODE:
786{
787 dREQ;
788
789 req->int2 = SvOK (uid) ? SvIV (uid) : -1;
790 req->int3 = SvOK (gid) ? SvIV (gid) : -1;
791 req->sv1 = newSVsv (fh_or_path);
792
793 if (SvPOK (fh_or_path))
794 {
795 req->type = EIO_CHOWN;
796 req->ptr1 = SvPVbyte_nolen (req->sv1);
797 }
798 else
799 {
800 req->type = EIO_FCHOWN;
801 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
802 }
803
804 REQ_SEND;
805}
806
807void
693aio_unlink(pathname,callback=&PL_sv_undef) 808aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
694 SV * pathname
695 SV * callback
696 ALIAS: 809 ALIAS:
697 aio_unlink = REQ_UNLINK 810 aio_unlink = EIO_UNLINK
698 aio_rmdir = REQ_RMDIR 811 aio_rmdir = EIO_RMDIR
812 aio_readdir = EIO_READDIR
699 CODE: 813 PPCODE:
700{ 814{
701 dREQ; 815 dREQ;
702 816
703 req->type = ix; 817 req->type = ix;
704 req->data = newSVsv (pathname); 818 req->sv1 = newSVsv (pathname);
705 req->dataptr = SvPVbyte_nolen (req->data); 819 req->ptr1 = SvPVbyte_nolen (req->sv1);
820
821 REQ_SEND;
822}
823
824void
825aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
826 ALIAS:
827 aio_link = EIO_LINK
828 aio_symlink = EIO_SYMLINK
829 aio_rename = EIO_RENAME
830 PPCODE:
831{
832 dREQ;
706 833
707 send_req (req); 834 req->type = ix;
708} 835 req->sv1 = newSVsv (oldpath);
709 836 req->ptr1 = SvPVbyte_nolen (req->sv1);
710void 837 req->sv2 = newSVsv (newpath);
711aio_symlink(oldpath,newpath,callback=&PL_sv_undef) 838 req->ptr2 = SvPVbyte_nolen (req->sv2);
712 SV * oldpath
713 SV * newpath
714 SV * callback
715 CODE:
716{
717 dREQ;
718 839
719 req->type = REQ_SYMLINK; 840 REQ_SEND;
720 req->fh = newSVsv (oldpath); 841}
721 req->data2ptr = SvPVbyte_nolen (req->fh); 842
722 req->data = newSVsv (newpath); 843void
723 req->dataptr = SvPVbyte_nolen (req->data); 844aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
845 PPCODE:
846{
847 dREQ;
724 848
725 send_req (req); 849 req->type = EIO_MKNOD;
850 req->sv1 = newSVsv (pathname);
851 req->ptr1 = SvPVbyte_nolen (req->sv1);
852 req->int2 = (mode_t)mode;
853 req->offs = dev;
854
855 REQ_SEND;
726} 856}
727 857
728void 858void
859aio_busy (double delay, SV *callback=&PL_sv_undef)
860 PPCODE:
861{
862 dREQ;
863
864 req->type = EIO_BUSY;
865 req->nv1 = delay < 0. ? 0. : delay;
866
867 REQ_SEND;
868}
869
870void
871aio_group (SV *callback=&PL_sv_undef)
872 PROTOTYPE: ;$
873 PPCODE:
874{
875 dREQ;
876
877 req->type = EIO_GROUP;
878
879 eio_submit (req);
880 XPUSHs (req_sv (req, AIO_GRP_KLASS));
881}
882
883void
884aio_nop (SV *callback=&PL_sv_undef)
885 ALIAS:
886 aio_nop = EIO_NOP
887 aio_sync = EIO_SYNC
888 PPCODE:
889{
890 dREQ;
891
892 req->type = ix;
893
894 REQ_SEND;
895}
896
897int
898aioreq_pri (int pri = 0)
899 PROTOTYPE: ;$
900 CODE:
901 RETVAL = next_pri - EIO_PRI_BIAS;
902 if (items > 0)
903 {
904 if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
905 if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
906 next_pri = pri + EIO_PRI_BIAS;
907 }
908 OUTPUT:
909 RETVAL
910
911void
912aioreq_nice (int nice = 0)
913 CODE:
914 nice = next_pri - nice;
915 if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
916 if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
917 next_pri = nice + EIO_PRI_BIAS;
918
919void
729flush() 920flush ()
730 PROTOTYPE: 921 PROTOTYPE:
731 CODE: 922 CODE:
732 while (nreqs) 923 while (nreqs)
733 { 924 {
734 poll_wait (); 925 poll_wait ();
735 poll_cb (); 926 poll_cb ();
736 } 927 }
737 928
738void 929int
739poll() 930poll()
740 PROTOTYPE: 931 PROTOTYPE:
741 CODE: 932 CODE:
742 if (nreqs)
743 {
744 poll_wait (); 933 poll_wait ();
745 poll_cb (); 934 RETVAL = poll_cb ();
746 } 935 OUTPUT:
936 RETVAL
747 937
748int 938int
749poll_fileno() 939poll_fileno()
750 PROTOTYPE: 940 PROTOTYPE:
751 CODE: 941 CODE:
… …
763 953
764void 954void
765poll_wait() 955poll_wait()
766 PROTOTYPE: 956 PROTOTYPE:
767 CODE: 957 CODE:
768 if (nreqs)
769 poll_wait (); 958 poll_wait ();
770 959
771int 960int
772nreqs() 961nreqs()
773 PROTOTYPE: 962 PROTOTYPE:
774 CODE: 963 CODE:
775 RETVAL = nreqs; 964 RETVAL = eio_nreqs ();
776 OUTPUT: 965 OUTPUT:
777 RETVAL 966 RETVAL
778 967
968int
969nready()
970 PROTOTYPE:
971 CODE:
972 RETVAL = eio_nready ();
973 OUTPUT:
974 RETVAL
975
976int
977npending()
978 PROTOTYPE:
979 CODE:
980 RETVAL = eio_npending ();
981 OUTPUT:
982 RETVAL
983
984int
985nthreads()
986 PROTOTYPE:
987 CODE:
988 if (WORDACCESS_UNSAFE) X_LOCK (wrklock);
989 RETVAL = started;
990 if (WORDACCESS_UNSAFE) X_UNLOCK (wrklock);
991 OUTPUT:
992 RETVAL
993
994PROTOTYPES: DISABLE
995
996MODULE = IO::AIO PACKAGE = IO::AIO::REQ
997
998void
999cancel (aio_req_ornot req)
1000 CODE:
1001 eio_cancel (req);
1002
1003void
1004cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
1005 CODE:
1006 SvREFCNT_dec (req->callback);
1007 req->callback = newSVsv (callback);
1008
1009MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1010
1011void
1012add (aio_req grp, ...)
1013 PPCODE:
1014{
1015 int i;
1016
1017 if (grp->int1 == 2)
1018 croak ("cannot add requests to IO::AIO::GRP after the group finished");
1019
1020 for (i = 1; i < items; ++i )
1021 {
1022 aio_req req;
1023
1024 if (GIMME_V != G_VOID)
1025 XPUSHs (sv_2mortal (newSVsv (ST (i))));
1026
1027 req = SvAIO_REQ (ST (i));
1028
1029 if (req)
1030 eio_grp_add (grp, req);
1031 }
1032}
1033
1034void
1035cancel_subs (aio_req_ornot req)
1036 CODE:
1037 req_cancel_subs (req);
1038
1039void
1040result (aio_req grp, ...)
1041 CODE:
1042{
1043 int i;
1044 AV *av;
1045
1046 grp->errorno = errno;
1047
1048 av = newAV ();
1049
1050 for (i = 1; i < items; ++i )
1051 av_push (av, newSVsv (ST (i)));
1052
1053 SvREFCNT_dec (grp->sv1);
1054 grp->sv1 = (SV *)av;
1055}
1056
1057void
1058errno (aio_req grp, int errorno = errno)
1059 CODE:
1060 grp->errorno = errorno;
1061
1062void
1063limit (aio_req grp, int limit)
1064 CODE:
1065 eio_grp_limit (grp, limit);
1066
1067void
1068feed (aio_req grp, SV *callback=&PL_sv_undef)
1069 CODE:
1070{
1071 SvREFCNT_dec (grp->sv2);
1072 grp->sv2 = newSVsv (callback);
1073
1074 if (grp->int2 <= 0)
1075 grp->int2 = 2;
1076
1077 eio_grp_limit (grp, grp->int2);
1078}
1079

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