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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.23 by root, Tue Aug 16 23:33:34 2005 UTC vs.
Revision 1.123 by root, Sat May 17 12:17:25 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/* perl namespace pollution */
19#undef VERSION
19 20
20typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ 21#ifdef _WIN32
21typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
22typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
23 22
24#if __ia64 23# define EIO_STRUCT_DIRENT Direntry_t
25# define STACKSIZE 65536 24# undef malloc
25# undef free
26
27// perl overrides all those nice win32 functions
28# undef open
29# undef read
30# undef write
31# undef send
32# undef recv
33# undef stat
34# undef fstat
35# define lstat stat
36# undef truncate
37# undef ftruncate
38# undef open
39# undef close
40# undef unlink
41# undef rmdir
42# undef rename
43# undef lseek
44
45# define chown(a,b,c) (errno = ENOSYS, -1)
46# define fchown(a,b,c) (errno = ENOSYS, -1)
47# define fchmod(a,b) (errno = ENOSYS, -1)
48# define symlink(a,b) (errno = ENOSYS, -1)
49# define readlink(a,b,c) (errno = ENOSYS, -1)
50# define mknod(a,b,c) (errno = ENOSYS, -1)
51# define truncate(a,b) (errno = ENOSYS, -1)
52# define ftruncate(fd,o) chsize ((fd), (o))
53# define fsync(fd) _commit (fd)
54# define opendir(fd) (errno = ENOSYS, 0)
55# define readdir(fd) (errno = ENOSYS, -1)
56# define closedir(fd) (errno = ENOSYS, -1)
57# define mkdir(a,b) mkdir (a)
58
26#else 59#else
27# define STACKSIZE 4096 60
61# include <sys/time.h>
62# include <sys/select.h>
63# include <unistd.h>
64# include <utime.h>
65# include <signal.h>
66# define EIO_STRUCT_DIRENT struct dirent
67
28#endif 68#endif
29 69
70#define EIO_STRUCT_STAT Stat_t
71
72/* use NV for 32 bit perls as it allows larger offsets */
73#if IVSIZE >= 8
74# define SvVAL64 SvIV
75#else
76# define SvVAL64 SvNV
77#endif
78
79static HV *stash;
80typedef SV SV8; /* byte-sv, used for argument-checking */
81
82#define AIO_REQ_KLASS "IO::AIO::REQ"
83#define AIO_GRP_KLASS "IO::AIO::GRP"
84
85#define EIO_REQ_MEMBERS \
86 SV *callback; \
87 SV *sv1, *sv2; \
88 STRLEN stroffset; \
89 SV *self;
90
91#define EIO_NO_WRAPPERS 1
92
93#include "libeio/eio.h"
94
95static int req_invoke (eio_req *req);
96#define EIO_FINISH(req) req_invoke (req)
97static void aio_grp_feed (eio_req *grp);
98#define EIO_FEED(req) aio_grp_feed (req)
99static void req_destroy (eio_req *grp);
100#define EIO_DESTROY(req) req_destroy (req)
101
30enum { 102enum {
31 REQ_QUIT, 103 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}; 104};
39 105
40typedef struct aio_cb { 106#include "libeio/eio.c"
41 struct aio_cb *volatile next;
42 107
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; 108typedef eio_req *aio_req;
109typedef eio_req *aio_req_ornot;
59 110
60static int started; 111static SV *on_next_submit;
61static volatile int nreqs; 112static int next_pri = EIO_PRI_DEFAULT;
62static int max_outstanding = 1<<30; 113static int max_outstanding;
63static int respipe [2];
64 114
65static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; 115static int respipe_osf [2], respipe [2] = { -1, -1 };
66static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
67static pthread_mutex_t frklock = PTHREAD_MUTEX_INITIALIZER;
68static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
69 116
70static volatile aio_req reqs, reqe; /* queue start, queue end */ 117static void req_destroy (aio_req req);
71static volatile aio_req ress, rese; /* queue start, queue end */ 118static void req_cancel (aio_req req);
72 119
73static void 120static void want_poll (void)
74poll_wait ()
75{ 121{
76 if (nreqs && !ress) 122 /* write a dummy byte to the pipe so fh becomes ready */
123 respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
124}
125
126static void done_poll (void)
127{
128 /* read any signals sent by the worker threads */
129 char buf [4];
130 while (respipe_read (respipe [0], buf, 4) == 4)
131 ;
132}
133
134/* must be called at most once */
135static SV *req_sv (aio_req req, const char *klass)
136{
137 if (!req->self)
77 { 138 {
78 fd_set rfd; 139 req->self = (SV *)newHV ();
79 FD_ZERO(&rfd); 140 sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
80 FD_SET(respipe [0], &rfd);
81
82 select (respipe [0] + 1, &rfd, 0, 0, 0);
83 } 141 }
84}
85 142
86static int 143 return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
87poll_cb () 144}
145
146static aio_req SvAIO_REQ (SV *sv)
147{
148 MAGIC *mg;
149
150 if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
151 croak ("object of class " AIO_REQ_KLASS " expected");
152
153 mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
154
155 return mg ? (aio_req)mg->mg_ptr : 0;
156}
157
158static void aio_grp_feed (aio_req grp)
159{
160 if (grp->sv2 && SvOK (grp->sv2))
161 {
162 dSP;
163
164 ENTER;
165 SAVETMPS;
166 PUSHMARK (SP);
167 XPUSHs (req_sv (grp, AIO_GRP_KLASS));
168 PUTBACK;
169 call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
170 SPAGAIN;
171 FREETMPS;
172 LEAVE;
173 }
174}
175
176static void req_submit (eio_req *req)
177{
178 eio_submit (req);
179
180 if (on_next_submit)
181 {
182 dSP;
183 SV *cb = sv_2mortal (on_next_submit);
184
185 on_next_submit = 0;
186
187 PUSHMARK (SP);
188 PUTBACK;
189 call_sv (cb, G_DISCARD | G_EVAL);
190 }
191}
192
193static int req_invoke (eio_req *req)
88{ 194{
89 dSP; 195 dSP;
90 int count = 0;
91 aio_req req, prv;
92 196
93 pthread_mutex_lock (&reslock); 197 if (req->flags & FLAG_SV2_RO_OFF)
198 SvREADONLY_off (req->sv2);
94 199
95 { 200 if (!EIO_CANCELLED (req) && SvOK (req->callback))
96 /* read any signals sent by the worker threads */
97 char buf [32];
98 while (read (respipe [0], buf, 32) == 32)
99 ;
100 }
101
102 req = ress;
103 ress = rese = 0;
104
105 pthread_mutex_unlock (&reslock);
106
107 while (req)
108 { 201 {
109 nreqs--; 202 ENTER;
203 SAVETMPS;
204 PUSHMARK (SP);
205 EXTEND (SP, 1);
110 206
111 if (req->type == REQ_QUIT) 207 switch (req->type)
112 started--;
113 else
114 { 208 {
115 int errorno = errno; 209 case EIO_READDIR:
116 errno = req->errorno;
117
118 if (req->type == REQ_READ)
119 SvCUR_set (req->data, req->dataoffset
120 + req->result > 0 ? req->result : 0);
121
122 if (req->data)
123 SvREFCNT_dec (req->data);
124
125 if (req->fh)
126 SvREFCNT_dec (req->fh);
127
128 if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
129 { 210 {
130 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; 211 SV *rv = &PL_sv_undef;
131 PL_laststatval = req->result;
132 PL_statcache = *(req->statdata);
133 212
134 Safefree (req->statdata); 213 if (req->result >= 0)
214 {
215 int i;
216 char *buf = req->ptr2;
217 AV *av = newAV ();
218
219 av_extend (av, req->result - 1);
220
221 for (i = 0; i < req->result; ++i)
222 {
223 SV *sv = newSVpv (buf, 0);
224
225 av_store (av, i, sv);
226 buf += SvCUR (sv) + 1;
227 }
228
229 rv = sv_2mortal (newRV_noinc ((SV *)av));
230 }
231
232 PUSHs (rv);
135 } 233 }
234 break;
136 235
137 ENTER; 236 case EIO_OPEN:
138 PUSHMARK (SP);
139 XPUSHs (sv_2mortal (newSViv (req->result)));
140
141 if (req->type == REQ_OPEN)
142 { 237 {
143 /* convert fd to fh */ 238 /* convert fd to fh */
144 SV *fh; 239 SV *fh = &PL_sv_undef;
145 240
146 PUTBACK; 241 if (req->result >= 0)
147 call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); 242 {
148 SPAGAIN; 243 GV *gv = (GV *)sv_newmortal ();
244 int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
245 char sym [64];
246 int symlen;
247
248 symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
249 gv_init (gv, stash, sym, symlen, 0);
149 250
150 fh = SvREFCNT_inc (POPs); 251 symlen = snprintf (
252 sym,
253 sizeof (sym),
254 "%s&=%d",
255 flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
256 req->result
257 );
151 258
259 if (do_open (gv, sym, symlen, 0, 0, 0, 0))
260 fh = (SV *)gv;
261 }
262
152 PUSHMARK (SP); 263 PUSHs (fh);
153 XPUSHs (sv_2mortal (fh));
154 } 264 }
155
156 if (SvOK (req->callback))
157 {
158 PUTBACK;
159 call_sv (req->callback, G_VOID | G_EVAL);
160 SPAGAIN;
161 }
162
163 LEAVE;
164
165 if (req->callback)
166 SvREFCNT_dec (req->callback);
167
168 errno = errorno;
169 count++;
170 }
171
172 prv = req;
173 req = req->next;
174 Safefree (prv);
175
176 /* TODO: croak on errors? */
177 }
178
179 return count;
180}
181
182static void *aio_proc(void *arg);
183
184static void
185start_thread (void)
186{
187 sigset_t fullsigset, oldsigset;
188 pthread_t tid;
189 pthread_attr_t attr;
190
191 pthread_attr_init (&attr);
192 pthread_attr_setstacksize (&attr, STACKSIZE);
193 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
194
195 sigfillset (&fullsigset);
196 sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
197
198 if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
199 started++;
200
201 sigprocmask (SIG_SETMASK, &oldsigset, 0);
202}
203
204static void
205send_req (aio_req req)
206{
207 nreqs++;
208
209 pthread_mutex_lock (&reqlock);
210
211 req->next = 0;
212
213 if (reqe)
214 {
215 reqe->next = req;
216 reqe = req;
217 }
218 else
219 reqe = reqs = req;
220
221 pthread_cond_signal (&reqwait);
222 pthread_mutex_unlock (&reqlock);
223
224 while (nreqs > max_outstanding)
225 {
226 poll_wait ();
227 poll_cb ();
228 }
229}
230
231static void
232end_thread (void)
233{
234 aio_req req;
235 New (0, req, 1, aio_cb);
236 req->type = REQ_QUIT;
237
238 send_req (req);
239}
240
241
242static void min_parallel (int nthreads)
243{
244 while (nthreads > started)
245 start_thread ();
246}
247
248static void max_parallel (int nthreads)
249{
250 int cur = started;
251 while (cur > nthreads)
252 {
253 end_thread ();
254 cur--;
255 }
256
257 while (started > nthreads)
258 {
259 poll_wait ();
260 poll_cb ();
261 }
262}
263
264static int fork_started;
265
266static void atfork_prepare (void)
267{
268 pthread_mutex_lock (&frklock);
269
270 fork_started = started;
271
272 for (;;) {
273 while (nreqs)
274 {
275 poll_wait ();
276 poll_cb ();
277 }
278
279 max_parallel (0);
280
281 pthread_mutex_lock (&reqlock);
282
283 if (!nreqs && !started)
284 break;
285
286 pthread_mutex_unlock (&reqlock);
287
288 min_parallel (fork_started);
289 }
290
291 pthread_mutex_lock (&reslock);
292
293 assert (!started);
294 assert (!nreqs);
295 assert (!reqs && !reqe);
296 assert (!ress && !rese);
297}
298
299static void atfork_parent (void)
300{
301 pthread_mutex_unlock (&reslock);
302 min_parallel (fork_started);
303 pthread_mutex_unlock (&reqlock);
304 pthread_mutex_unlock (&frklock);
305}
306
307static void atfork_child (void)
308{
309 reqs = reqe = 0;
310
311 atfork_parent ();
312}
313
314/*****************************************************************************/
315/* work around various missing functions */
316
317#if !HAVE_PREADWRITE
318# define pread aio_pread
319# define pwrite aio_pwrite
320
321/*
322 * make our pread/pwrite safe against themselves, but not against
323 * normal read/write by using a mutex. slows down execution a lot,
324 * but that's your problem, not mine.
325 */
326static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
327
328static ssize_t
329pread (int fd, void *buf, size_t count, off_t offset)
330{
331 ssize_t res;
332 off_t ooffset;
333
334 pthread_mutex_lock (&iolock);
335 ooffset = lseek (fd, 0, SEEK_CUR);
336 lseek (fd, offset, SEEK_SET);
337 res = read (fd, buf, count);
338 lseek (fd, ooffset, SEEK_SET);
339 pthread_mutex_unlock (&iolock);
340
341 return res;
342}
343
344static ssize_t
345pwrite (int fd, void *buf, size_t count, off_t offset)
346{
347 ssize_t res;
348 off_t ooffset;
349
350 pthread_mutex_lock (&iolock);
351 ooffset = lseek (fd, 0, SEEK_CUR);
352 lseek (fd, offset, SEEK_SET);
353 res = write (fd, buf, count);
354 lseek (fd, offset, SEEK_SET);
355 pthread_mutex_unlock (&iolock);
356
357 return res;
358}
359#endif
360
361#if !HAVE_FDATASYNC
362# define fdatasync fsync
363#endif
364
365#if !HAVE_READAHEAD
366# define readahead aio_readahead
367
368static char readahead_buf[4096];
369
370static ssize_t
371readahead (int fd, off_t offset, size_t count)
372{
373 while (count > 0)
374 {
375 size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
376
377 pread (fd, readahead_buf, len, offset);
378 offset += len;
379 count -= len;
380 }
381
382 errno = 0;
383}
384#endif
385
386/*****************************************************************************/
387
388static void *
389aio_proc (void *thr_arg)
390{
391 aio_req req;
392 int type;
393
394 do
395 {
396 pthread_mutex_lock (&reqlock);
397
398 for (;;)
399 {
400 req = reqs;
401
402 if (reqs)
403 {
404 reqs = reqs->next;
405 if (!reqs) reqe = 0;
406 }
407
408 if (req)
409 break; 265 break;
410 266
411 pthread_cond_wait (&reqwait, &reqlock); 267 case EIO_GROUP:
412 } 268 req->int1 = 2; /* mark group as finished */
413 269
414 pthread_mutex_unlock (&reqlock); 270 if (req->sv1)
415
416 errno = 0; /* strictly unnecessary */
417
418 type = req->type;
419
420 switch (type)
421 { 271 {
422 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; 272 int i;
423 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; 273 AV *av = (AV *)req->sv1;
424 274
425 case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; 275 EXTEND (SP, AvFILL (av) + 1);
426 276 for (i = 0; i <= AvFILL (av); ++i)
427 case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; 277 PUSHs (*av_fetch (av, i, 0));
428 case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; 278 }
429 case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
430
431 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
432 case REQ_CLOSE: req->result = close (req->fd); break;
433 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
434 case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
435 case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
436
437 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
438 case REQ_FSYNC: req->result = fsync (req->fd); break;
439
440 case REQ_QUIT:
441 break; 279 break;
442 280
281 case EIO_NOP:
282 case EIO_BUSY:
283 break;
284
285 case EIO_READLINK:
286 if (req->result > 0)
287 PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
288 break;
289
290 case EIO_STAT:
291 case EIO_LSTAT:
292 case EIO_FSTAT:
293 PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
294 PL_laststatval = req->result;
295 PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
296 PUSHs (sv_2mortal (newSViv (req->result)));
297 break;
298
299 case EIO_READ:
300 SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
301 *SvEND (req->sv2) = 0;
302 PUSHs (sv_2mortal (newSViv (req->result)));
303 break;
304
305 case EIO_DUP2:
306 if (req->result > 0)
307 req->result = 0;
308 /* FALLTHROUGH */
309
443 default: 310 default:
444 req->result = ENOSYS; 311 PUSHs (sv_2mortal (newSViv (req->result)));
445 break; 312 break;
446 } 313 }
447 314
448 req->errorno = errno; 315 errno = req->errorno;
449 316
450 pthread_mutex_lock (&reslock); 317 PUTBACK;
318 call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
319 SPAGAIN;
451 320
452 req->next = 0; 321 FREETMPS;
322 LEAVE;
453 323
454 if (rese) 324 PUTBACK;
455 {
456 rese->next = req;
457 rese = req;
458 }
459 else
460 {
461 rese = ress = req;
462
463 /* write a dummy byte to the pipe so fh becomes ready */
464 write (respipe [1], &respipe, 1);
465 }
466
467 pthread_mutex_unlock (&reslock);
468 } 325 }
469 while (type != REQ_QUIT);
470 326
327 return !!SvTRUE (ERRSV);
328}
329
330static void req_destroy (aio_req req)
331{
332 if (req->self)
333 {
334 sv_unmagic (req->self, PERL_MAGIC_ext);
335 SvREFCNT_dec (req->self);
336 }
337
338 SvREFCNT_dec (req->sv1);
339 SvREFCNT_dec (req->sv2);
340 SvREFCNT_dec (req->callback);
341
342 Safefree (req);
343}
344
345static void req_cancel_subs (aio_req grp)
346{
347 aio_req sub;
348
349 if (grp->type != EIO_GROUP)
350 return;
351
352 SvREFCNT_dec (grp->sv2);
353 grp->sv2 = 0;
354
355 eio_grp_cancel (grp);
356}
357
358#ifdef USE_SOCKETS_AS_HANDLES
359# define TO_SOCKET(x) (win32_get_osfhandle (x))
360#else
361# define TO_SOCKET(x) (x)
362#endif
363
364static void
365create_respipe (void)
366{
367 int old_readfd = respipe [0];
368
369 if (respipe [1] >= 0)
370 respipe_close (TO_SOCKET (respipe [1]));
371
372#ifdef _WIN32
373 if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
374#else
375 if (pipe (respipe))
376#endif
377 croak ("unable to initialize result pipe");
378
379 if (old_readfd >= 0)
380 {
381 if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
382 croak ("unable to initialize result pipe(2)");
383
384 respipe_close (respipe [0]);
385 respipe [0] = old_readfd;
386 }
387
388#ifdef _WIN32
389 int arg = 1;
390 if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
391 || ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
392#else
393 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
394 || fcntl (respipe [1], F_SETFL, O_NONBLOCK))
395#endif
396 croak ("unable to initialize result pipe(3)");
397
398 respipe_osf [0] = TO_SOCKET (respipe [0]);
399 respipe_osf [1] = TO_SOCKET (respipe [1]);
400}
401
402static void poll_wait (void)
403{
404 fd_set rfd;
405
406 while (eio_nreqs ())
407 {
408 int size;
409
410 X_LOCK (reslock);
411 size = res_queue.size;
412 X_UNLOCK (reslock);
413
414 if (size)
415 return;
416
417 etp_maybe_start_thread ();
418
419 FD_ZERO (&rfd);
420 FD_SET (respipe [0], &rfd);
421
422 PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
423 }
424}
425
426static int poll_cb (void)
427{
428 int res;
429
430 do
431 {
432 res = eio_poll ();
433
434 if (res > 0)
435 croak (0);
436 }
437 while (max_outstanding && max_outstanding <= eio_nreqs ());
438
471 return 0; 439 return res;
440}
441
442static void atfork_child (void)
443{
444 create_respipe ();
472} 445}
473 446
474#define dREQ \ 447#define dREQ \
475 aio_req req; \ 448 aio_req req; \
449 int req_pri = next_pri; \
450 next_pri = EIO_PRI_DEFAULT; \
476 \ 451 \
477 if (SvOK (callback) && !SvROK (callback)) \ 452 if (SvOK (callback) && !SvROK (callback)) \
478 croak ("clalback must be undef or of reference type"); \ 453 croak ("callback must be undef or of reference type"); \
479 \ 454 \
480 Newz (0, req, 1, aio_cb); \ 455 Newz (0, req, 1, eio_req); \
481 if (!req) \ 456 if (!req) \
482 croak ("out of memory during aio_req allocation"); \ 457 croak ("out of memory during eio_req allocation"); \
483 \ 458 \
484 req->callback = SvREFCNT_inc (callback); 459 req->callback = newSVsv (callback); \
460 req->pri = req_pri
461
462#define REQ_SEND \
463 req_submit (req); \
464 \
465 if (GIMME_V != G_VOID) \
466 XPUSHs (req_sv (req, AIO_REQ_KLASS));
485 467
486MODULE = IO::AIO PACKAGE = IO::AIO 468MODULE = IO::AIO PACKAGE = IO::AIO
487 469
488PROTOTYPES: ENABLE 470PROTOTYPES: ENABLE
489 471
490BOOT: 472BOOT:
491{ 473{
492 if (pipe (respipe)) 474 stash = gv_stashpv ("IO::AIO", 1);
493 croak ("unable to initialize result pipe");
494 475
495 if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) 476 newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
496 croak ("cannot set result pipe to nonblocking mode"); 477 newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
478 newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
479 newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
480 newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
481#ifndef _WIN32
482 newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
483#endif
497 484
498 if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) 485 create_respipe ();
499 croak ("cannot set result pipe to nonblocking mode");
500 486
501 pthread_atfork (atfork_prepare, atfork_parent, atfork_child); 487 if (eio_init (want_poll, done_poll) < 0)
502} 488 croak ("IO::AIO: unable to initialise eio library");
503 489
490 /* atfork child called in fifo order, so before eio's handler */
491 X_THREAD_ATFORK (0, 0, atfork_child);
492}
493
504void 494void
505min_parallel(nthreads) 495max_poll_reqs (int nreqs)
506 int nthreads
507 PROTOTYPE: $ 496 PROTOTYPE: $
497 CODE:
498 eio_set_max_poll_reqs (nreqs);
508 499
509void 500void
510max_parallel(nthreads) 501max_poll_time (double nseconds)
511 int nthreads
512 PROTOTYPE: $ 502 PROTOTYPE: $
513
514int
515max_outstanding(nreqs)
516 int nreqs
517 PROTOTYPE: $
518 CODE: 503 CODE:
519 RETVAL = max_outstanding; 504 eio_set_max_poll_time (nseconds);
505
506void
507min_parallel (int nthreads)
508 PROTOTYPE: $
509 CODE:
510 eio_set_min_parallel (nthreads);
511
512void
513max_parallel (int nthreads)
514 PROTOTYPE: $
515 CODE:
516 eio_set_max_parallel (nthreads);
517
518void
519max_idle (int nthreads)
520 PROTOTYPE: $
521 CODE:
522 eio_set_max_idle (nthreads);
523
524void
525max_outstanding (int maxreqs)
526 PROTOTYPE: $
527 CODE:
520 max_outstanding = nreqs; 528 max_outstanding = maxreqs;
521 529
522void 530void
523aio_open(pathname,flags,mode,callback=&PL_sv_undef) 531aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
524 SV * pathname
525 int flags
526 int mode
527 SV * callback
528 PROTOTYPE: $$$;$ 532 PROTOTYPE: $$$;$
529 CODE: 533 PPCODE:
530{ 534{
531 dREQ; 535 dREQ;
532 536
533 req->type = REQ_OPEN; 537 req->type = EIO_OPEN;
534 req->data = newSVsv (pathname); 538 req->sv1 = newSVsv (pathname);
535 req->dataptr = SvPVbyte_nolen (req->data); 539 req->ptr1 = SvPVbyte_nolen (req->sv1);
536 req->fd = flags; 540 req->int1 = flags;
537 req->mode = mode; 541 req->int2 = mode;
538 542
539 send_req (req); 543 REQ_SEND;
540} 544}
541 545
542void 546void
543aio_close(fh,callback=&PL_sv_undef) 547aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
544 SV * fh
545 SV * callback
546 PROTOTYPE: $;$ 548 PROTOTYPE: $;$
547 ALIAS: 549 ALIAS:
548 aio_close = REQ_CLOSE
549 aio_fsync = REQ_FSYNC 550 aio_fsync = EIO_FSYNC
550 aio_fdatasync = REQ_FDATASYNC 551 aio_fdatasync = EIO_FDATASYNC
551 CODE: 552 PPCODE:
552{ 553{
553 dREQ; 554 dREQ;
554 555
555 req->type = ix; 556 req->type = ix;
556 req->fh = newSVsv (fh); 557 req->sv1 = newSVsv (fh);
557 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 558 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
558 559
559 send_req (req); 560 REQ_SEND (req);
560} 561}
561 562
562void 563void
564aio_close (SV *fh, SV *callback=&PL_sv_undef)
565 PROTOTYPE: $;$
566 PPCODE:
567{
568 static int close_pipe = -1; /* dummy fd to close fds via dup2 */
569 dREQ;
570
571 if (close_pipe < 0)
572 {
573 int pipefd [2];
574
575 if (pipe (pipefd) < 0
576 || close (pipefd [1]) < 0
577 || fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
578 abort (); /*D*/
579
580 close_pipe = pipefd [0];
581 }
582
583 req->type = EIO_DUP2;
584 req->int1 = close_pipe;
585 req->sv2 = newSVsv (fh);
586 req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
587
588 REQ_SEND (req);
589}
590
591void
563aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) 592aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
564 SV * fh
565 UV offset
566 IV length
567 SV * data
568 IV dataoffset
569 SV * callback
570 ALIAS: 593 ALIAS:
571 aio_read = REQ_READ 594 aio_read = EIO_READ
572 aio_write = REQ_WRITE 595 aio_write = EIO_WRITE
573 PROTOTYPE: $$$$$;$ 596 PROTOTYPE: $$$$$;$
574 CODE: 597 PPCODE:
575{ 598{
576 aio_req req;
577 STRLEN svlen; 599 STRLEN svlen;
578 char *svptr = SvPVbyte (data, svlen); 600 char *svptr = SvPVbyte (data, svlen);
601 UV len = SvUV (length);
579 602
580 SvUPGRADE (data, SVt_PV); 603 SvUPGRADE (data, SVt_PV);
581 SvPOK_on (data); 604 SvPOK_on (data);
582 605
583 if (dataoffset < 0) 606 if (dataoffset < 0)
584 dataoffset += svlen; 607 dataoffset += svlen;
585 608
586 if (dataoffset < 0 || dataoffset > svlen) 609 if (dataoffset < 0 || dataoffset > svlen)
587 croak ("data offset outside of string"); 610 croak ("dataoffset outside of data scalar");
588 611
589 if (ix == REQ_WRITE) 612 if (ix == EIO_WRITE)
590 { 613 {
591 /* write: check length and adjust. */ 614 /* write: check length and adjust. */
592 if (length < 0 || length + dataoffset > svlen) 615 if (!SvOK (length) || len + dataoffset > svlen)
593 length = svlen - dataoffset; 616 len = svlen - dataoffset;
594 } 617 }
595 else 618 else
596 { 619 {
597 /* read: grow scalar as necessary */ 620 /* read: grow scalar as necessary */
598 svptr = SvGROW (data, length + dataoffset); 621 svptr = SvGROW (data, len + dataoffset + 1);
599 } 622 }
600 623
601 if (length < 0) 624 if (len < 0)
602 croak ("length must not be negative"); 625 croak ("length must not be negative");
603 626
604 { 627 {
605 dREQ; 628 dREQ;
606 629
607 req->type = ix; 630 req->type = ix;
608 req->fh = newSVsv (fh); 631 req->sv1 = newSVsv (fh);
609 req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh)) 632 req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
610 : IoOFP (sv_2io (fh))); 633 : IoOFP (sv_2io (fh)));
634 req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
611 req->offset = offset; 635 req->size = len;
612 req->length = length;
613 req->data = SvREFCNT_inc (data); 636 req->sv2 = SvREFCNT_inc (data);
614 req->dataptr = (char *)svptr + dataoffset; 637 req->ptr2 = (char *)svptr + dataoffset;
615 req->callback = SvREFCNT_inc (callback); 638 req->stroffset = dataoffset;
616 639
617 send_req (req); 640 if (!SvREADONLY (data))
641 {
642 SvREADONLY_on (data);
643 req->flags |= FLAG_SV2_RO_OFF;
644 }
645
646 REQ_SEND;
618 } 647 }
619} 648}
620 649
621void 650void
651aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
652 PROTOTYPE: $$;$
653 PPCODE:
654{
655 SV *data;
656 dREQ;
657
658 req->type = EIO_READLINK;
659 req->sv1 = newSVsv (path);
660 req->ptr1 = SvPVbyte_nolen (req->sv1);
661
662 REQ_SEND;
663}
664
665void
666aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
667 PROTOTYPE: $$$$;$
668 PPCODE:
669{
670 dREQ;
671
672 req->type = EIO_SENDFILE;
673 req->sv1 = newSVsv (out_fh);
674 req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
675 req->sv2 = newSVsv (in_fh);
676 req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
677 req->offs = SvVAL64 (in_offset);
678 req->size = length;
679
680 REQ_SEND;
681}
682
683void
622aio_readahead(fh,offset,length,callback=&PL_sv_undef) 684aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
623 SV * fh
624 UV offset
625 IV length
626 SV * callback
627 PROTOTYPE: $$$;$ 685 PROTOTYPE: $$$;$
628 CODE: 686 PPCODE:
629{ 687{
630 dREQ; 688 dREQ;
631 689
632 req->type = REQ_READAHEAD; 690 req->type = EIO_READAHEAD;
633 req->fh = newSVsv (fh); 691 req->sv1 = newSVsv (fh);
634 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh))); 692 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
635 req->offset = offset; 693 req->offs = SvVAL64 (offset);
636 req->length = length; 694 req->size = length;
637 695
638 send_req (req); 696 REQ_SEND;
639} 697}
640 698
641void 699void
642aio_stat(fh_or_path,callback=&PL_sv_undef) 700aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
643 SV * fh_or_path
644 SV * callback
645 ALIAS: 701 ALIAS:
646 aio_stat = REQ_STAT 702 aio_stat = EIO_STAT
647 aio_lstat = REQ_LSTAT 703 aio_lstat = EIO_LSTAT
648 CODE: 704 PPCODE:
649{ 705{
650 dREQ; 706 dREQ;
651 707
652 New (0, req->statdata, 1, Stat_t); 708 req->sv1 = newSVsv (fh_or_path);
653 if (!req->statdata)
654 croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");
655 709
656 if (SvPOK (fh_or_path)) 710 if (SvPOK (req->sv1))
657 { 711 {
658 req->type = ix; 712 req->type = ix;
659 req->data = newSVsv (fh_or_path);
660 req->dataptr = SvPVbyte_nolen (req->data); 713 req->ptr1 = SvPVbyte_nolen (req->sv1);
661 } 714 }
662 else 715 else
663 { 716 {
664 req->type = REQ_FSTAT; 717 req->type = EIO_FSTAT;
665 req->fh = newSVsv (fh_or_path);
666 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); 718 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
719 }
720
721 REQ_SEND;
722}
723
724void
725aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
726 PPCODE:
727{
728 dREQ;
729
730 req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
731 req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
732 req->sv1 = newSVsv (fh_or_path);
733
734 if (SvPOK (req->sv1))
667 } 735 {
736 req->type = EIO_UTIME;
737 req->ptr1 = SvPVbyte_nolen (req->sv1);
738 }
739 else
740 {
741 req->type = EIO_FUTIME;
742 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
743 }
668 744
669 send_req (req); 745 REQ_SEND;
670} 746}
671 747
672void 748void
749aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
750 PPCODE:
751{
752 dREQ;
753
754 req->sv1 = newSVsv (fh_or_path);
755 req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
756
757 if (SvPOK (req->sv1))
758 {
759 req->type = EIO_TRUNCATE;
760 req->ptr1 = SvPVbyte_nolen (req->sv1);
761 }
762 else
763 {
764 req->type = EIO_FTRUNCATE;
765 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
766 }
767
768 REQ_SEND;
769}
770
771void
772aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
773 ALIAS:
774 aio_chmod = EIO_CHMOD
775 aio_mkdir = EIO_MKDIR
776 PPCODE:
777{
778 dREQ;
779
780 req->int2 = mode;
781 req->sv1 = newSVsv (fh_or_path);
782
783 if (SvPOK (req->sv1))
784 {
785 req->type = ix;
786 req->ptr1 = SvPVbyte_nolen (req->sv1);
787 }
788 else
789 {
790 req->type = EIO_FCHMOD;
791 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
792 }
793
794 REQ_SEND;
795}
796
797void
798aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
799 PPCODE:
800{
801 dREQ;
802
803 req->int2 = SvOK (uid) ? SvIV (uid) : -1;
804 req->int3 = SvOK (gid) ? SvIV (gid) : -1;
805 req->sv1 = newSVsv (fh_or_path);
806
807 if (SvPOK (req->sv1))
808 {
809 req->type = EIO_CHOWN;
810 req->ptr1 = SvPVbyte_nolen (req->sv1);
811 }
812 else
813 {
814 req->type = EIO_FCHOWN;
815 req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
816 }
817
818 REQ_SEND;
819}
820
821void
673aio_unlink(pathname,callback=&PL_sv_undef) 822aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
674 SV * pathname
675 SV * callback
676 ALIAS: 823 ALIAS:
677 aio_unlink = REQ_UNLINK 824 aio_unlink = EIO_UNLINK
678 aio_rmdir = REQ_RMDIR 825 aio_rmdir = EIO_RMDIR
826 aio_readdir = EIO_READDIR
679 CODE: 827 PPCODE:
680{ 828{
681 dREQ; 829 dREQ;
682 830
683 req->type = ix; 831 req->type = ix;
684 req->data = newSVsv (pathname); 832 req->sv1 = newSVsv (pathname);
685 req->dataptr = SvPVbyte_nolen (req->data); 833 req->ptr1 = SvPVbyte_nolen (req->sv1);
834
835 REQ_SEND;
836}
837
838void
839aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
840 ALIAS:
841 aio_link = EIO_LINK
842 aio_symlink = EIO_SYMLINK
843 aio_rename = EIO_RENAME
844 PPCODE:
845{
846 dREQ;
686 847
687 send_req (req); 848 req->type = ix;
688} 849 req->sv1 = newSVsv (oldpath);
689 850 req->ptr1 = SvPVbyte_nolen (req->sv1);
690void 851 req->sv2 = newSVsv (newpath);
691aio_symlink(oldpath,newpath,callback=&PL_sv_undef) 852 req->ptr2 = SvPVbyte_nolen (req->sv2);
692 SV * oldpath
693 SV * newpath
694 SV * callback
695 CODE:
696{
697 dREQ;
698 853
699 req->type = REQ_SYMLINK; 854 REQ_SEND;
700 req->fh = newSVsv (oldpath); 855}
701 req->data2ptr = SvPVbyte_nolen (req->fh); 856
702 req->data = newSVsv (newpath); 857void
703 req->dataptr = SvPVbyte_nolen (req->data); 858aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
859 PPCODE:
860{
861 dREQ;
704 862
705 send_req (req); 863 req->type = EIO_MKNOD;
864 req->sv1 = newSVsv (pathname);
865 req->ptr1 = SvPVbyte_nolen (req->sv1);
866 req->int2 = (mode_t)mode;
867 req->offs = dev;
868
869 REQ_SEND;
706} 870}
707 871
708void 872void
873aio_busy (double delay, SV *callback=&PL_sv_undef)
874 PPCODE:
875{
876 dREQ;
877
878 req->type = EIO_BUSY;
879 req->nv1 = delay < 0. ? 0. : delay;
880
881 REQ_SEND;
882}
883
884void
885aio_group (SV *callback=&PL_sv_undef)
886 PROTOTYPE: ;$
887 PPCODE:
888{
889 dREQ;
890
891 req->type = EIO_GROUP;
892
893 eio_submit (req);
894 XPUSHs (req_sv (req, AIO_GRP_KLASS));
895}
896
897void
898aio_nop (SV *callback=&PL_sv_undef)
899 ALIAS:
900 aio_nop = EIO_NOP
901 aio_sync = EIO_SYNC
902 PPCODE:
903{
904 dREQ;
905
906 req->type = ix;
907
908 REQ_SEND;
909}
910
911int
912aioreq_pri (int pri = 0)
913 PROTOTYPE: ;$
914 CODE:
915 RETVAL = next_pri;
916 if (items > 0)
917 {
918 if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
919 if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
920 next_pri = pri;
921 }
922 OUTPUT:
923 RETVAL
924
925void
926aioreq_nice (int nice = 0)
927 CODE:
928 nice = next_pri - nice;
929 if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
930 if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
931 next_pri = nice;
932
933void
709flush() 934flush ()
710 PROTOTYPE: 935 PROTOTYPE:
711 CODE: 936 CODE:
712 while (nreqs) 937 while (eio_nreqs ())
713 { 938 {
714 poll_wait (); 939 poll_wait ();
715 poll_cb (); 940 poll_cb ();
716 } 941 }
717 942
718void 943int
719poll() 944poll()
720 PROTOTYPE: 945 PROTOTYPE:
721 CODE: 946 CODE:
722 if (nreqs)
723 {
724 poll_wait (); 947 poll_wait ();
725 poll_cb (); 948 RETVAL = poll_cb ();
726 } 949 OUTPUT:
950 RETVAL
727 951
728int 952int
729poll_fileno() 953poll_fileno()
730 PROTOTYPE: 954 PROTOTYPE:
731 CODE: 955 CODE:
743 967
744void 968void
745poll_wait() 969poll_wait()
746 PROTOTYPE: 970 PROTOTYPE:
747 CODE: 971 CODE:
748 if (nreqs)
749 poll_wait (); 972 poll_wait ();
750 973
751int 974int
752nreqs() 975nreqs()
753 PROTOTYPE: 976 PROTOTYPE:
754 CODE: 977 CODE:
755 RETVAL = nreqs; 978 RETVAL = eio_nreqs ();
756 OUTPUT: 979 OUTPUT:
757 RETVAL 980 RETVAL
758 981
982int
983nready()
984 PROTOTYPE:
985 CODE:
986 RETVAL = eio_nready ();
987 OUTPUT:
988 RETVAL
989
990int
991npending()
992 PROTOTYPE:
993 CODE:
994 RETVAL = eio_npending ();
995 OUTPUT:
996 RETVAL
997
998int
999nthreads()
1000 PROTOTYPE:
1001 CODE:
1002 RETVAL = eio_nthreads ();
1003 OUTPUT:
1004 RETVAL
1005
1006void _on_next_submit (SV *cb)
1007 CODE:
1008 SvREFCNT_dec (on_next_submit);
1009 on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
1010
1011PROTOTYPES: DISABLE
1012
1013MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1014
1015void
1016cancel (aio_req_ornot req)
1017 CODE:
1018 eio_cancel (req);
1019
1020void
1021cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
1022 CODE:
1023 SvREFCNT_dec (req->callback);
1024 req->callback = newSVsv (callback);
1025
1026MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1027
1028void
1029add (aio_req grp, ...)
1030 PPCODE:
1031{
1032 int i;
1033
1034 if (grp->int1 == 2)
1035 croak ("cannot add requests to IO::AIO::GRP after the group finished");
1036
1037 for (i = 1; i < items; ++i )
1038 {
1039 aio_req req;
1040
1041 if (GIMME_V != G_VOID)
1042 XPUSHs (sv_2mortal (newSVsv (ST (i))));
1043
1044 req = SvAIO_REQ (ST (i));
1045
1046 if (req)
1047 eio_grp_add (grp, req);
1048 }
1049}
1050
1051void
1052cancel_subs (aio_req_ornot req)
1053 CODE:
1054 req_cancel_subs (req);
1055
1056void
1057result (aio_req grp, ...)
1058 CODE:
1059{
1060 int i;
1061 AV *av;
1062
1063 grp->errorno = errno;
1064
1065 av = newAV ();
1066
1067 for (i = 1; i < items; ++i )
1068 av_push (av, newSVsv (ST (i)));
1069
1070 SvREFCNT_dec (grp->sv1);
1071 grp->sv1 = (SV *)av;
1072}
1073
1074void
1075errno (aio_req grp, int errorno = errno)
1076 CODE:
1077 grp->errorno = errorno;
1078
1079void
1080limit (aio_req grp, int limit)
1081 CODE:
1082 eio_grp_limit (grp, limit);
1083
1084void
1085feed (aio_req grp, SV *callback=&PL_sv_undef)
1086 CODE:
1087{
1088 SvREFCNT_dec (grp->sv2);
1089 grp->sv2 = newSVsv (callback);
1090
1091 if (grp->int2 <= 0)
1092 grp->int2 = 2;
1093
1094 eio_grp_limit (grp, grp->int2);
1095}
1096

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