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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.3 by root, Sun Jul 10 20:07:11 2005 UTC vs.
Revision 1.120 by root, Sun May 11 19:17:09 2008 UTC

1	#define PERL_NO_GET_CONTEXT	1	#include "libeio/xthread.h"
		2
		3	#include <errno.h>
2		4
3	#include "EXTERN.h"	5	#include "EXTERN.h"
4	#include "perl.h"	6	#include "perl.h"
5	#include "XSUB.h"	7	#include "XSUB.h"
6		8
		9	#include <stddef.h>
		10	#include <stdlib.h>
		11	#include <errno.h>
7	#include <sys/types.h>	12	#include <sys/types.h>
8	#include <sys/stat.h>	13	#include <sys/stat.h>
9	#include <unistd.h>	14	#include <limits.h>
10	#include <fcntl.h>	15	#include <fcntl.h>
11	#include <signal.h>
12	#include <sched.h>	16	#include <sched.h>
13	#include <endian.h>
14		17
15	#include <pthread.h>	18	/* perl namespace pollution */
16	#include <sys/syscall.h>	19	#undef VERSION
17		20
18	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	21	#ifdef _WIN32
19	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
20	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
21		22
22	#if __i386 || __amd64	23	# define EIO_STRUCT_DIRENT Direntry_t
23	# define STACKSIZE ( 256 * sizeof (long))	24	# undef malloc
24	#elif __ia64	25	# undef free
25	# define STACKSIZE (8192 * sizeof (long))	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 ( 512 * sizeof (long))	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
		79	static HV *stash;
		80	typedef 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_COMMON \
		86	SV *callback; \
		87	SV *sv1, *sv2; \
		88	STRLEN stroffset; \
		89	SV *self
		90
		91	#include "libeio/eio.h"
		92
		93	static int req_invoke (eio_req *req);
		94	#define EIO_FINISH(req) req_invoke (req)
		95	static void aio_grp_feed (eio_req *grp);
		96	#define EIO_FEED(req) aio_grp_feed (req)
		97	static void req_destroy (eio_req *grp);
		98	#define EIO_DESTROY(req) req_destroy (req)
		99
30	enum {	100	enum {
31	REQ_QUIT,	101	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, REQ_UNLINK,
35	REQ_FSYNC, REQ_FDATASYNC,
36	};	102	};
37		103
38	typedef struct aio_cb {	104	#include "libeio/eio.c"
39	struct aio_cb *volatile next;
40		105
41	int type;
42
43	int fd;
44	off_t offset;
45	size_t length;
46	ssize_t result;
47	mode_t mode; /* open */
48	int errorno;
49	SV *data, *callback;
50	void *dataptr;
51	STRLEN dataoffset;
52
53	Stat_t *statdata;
54	} aio_cb;
55
56	typedef aio_cb *aio_req;	106	typedef eio_req *aio_req;
		107	typedef eio_req *aio_req_ornot;
57		108
58	static int started;	109	static SV *on_next_submit;
59	static int nreqs;	110	static int next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS;
60	static int respipe [2];	111	static int max_outstanding;
61		112
62	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	113	static int respipe_osf [2], respipe [2] = { -1, -1 };
63	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
64	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
65		114
66	static volatile aio_req reqs, reqe; /* queue start, queue end */	115	static void req_destroy (aio_req req);
67	static volatile aio_req ress, rese; /* queue start, queue end */	116	static void req_cancel (aio_req req);
68		117
69	static void *aio_proc(void *arg);	118	static void want_poll (void)
70
71	static void
72	start_thread (void)
73	{	119	{
74	sigset_t fullsigset, oldsigset;	120	/* write a dummy byte to the pipe so fh becomes ready */
75	pthread_t tid;	121	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
76	pthread_attr_t attr;
77
78	pthread_attr_init (&attr);
79	pthread_attr_setstacksize (&attr, STACKSIZE);
80	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
81
82	sigfillset (&fullsigset);
83	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
84
85	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
86	started++;
87
88	sigprocmask (SIG_SETMASK, &oldsigset, 0);
89	}	122	}
90		123
91	static void	124	static void done_poll (void)
92	send_req (aio_req req)
93	{	125	{
94	nreqs++;	126	/* read any signals sent by the worker threads */
		127	char buf [4];
		128	while (respipe_read (respipe [0], buf, 4) == 4)
		129	;
		130	}
95		131
96	pthread_mutex_lock (&reqlock);	132	/* must be called at most once */
97		133	static SV *req_sv (aio_req req, const char *klass)
98	req->next = 0;	134	{
99
100	if (reqe)	135	if (!req->self)
101	{	136	{
102	reqe->next = req;	137	req->self = (SV *)newHV ();
103	reqe = req;	138	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
104	}	139	}
105	else
106	reqe = reqs = req;
107		140
108	pthread_cond_signal (&reqwait);	141	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
109	pthread_mutex_unlock (&reqlock);
110	}	142	}
111		143
112	static void	144	static aio_req SvAIO_REQ (SV *sv)
113	end_thread (void)
114	{	145	{
115	aio_req req;	146	MAGIC *mg;
116	New (0, req, 1, aio_cb);
117	req->type = REQ_QUIT;
118		147
119	send_req (req);	148	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
120	}	149	croak ("object of class " AIO_REQ_KLASS " expected");
121		150
122	static void	151	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
123	read_write (pTHX_
124	int dowrite, int fd, off_t offset, size_t length,
125	SV *data, STRLEN dataoffset, SV *callback)
126	{
127	aio_req req;
128	STRLEN svlen;
129	char *svptr = SvPV (data, svlen);
130		152
131	SvUPGRADE (data, SVt_PV);	153	return mg ? (aio_req)mg->mg_ptr : 0;
132	SvPOK_on (data);	154	}
133		155
134	if (dataoffset < 0)	156	static void aio_grp_feed (aio_req grp)
135	dataoffset += svlen;	157	{
136		158	if (grp->sv2 && SvOK (grp->sv2))
137	if (dataoffset < 0 || dataoffset > svlen)
138	croak ("data offset outside of string");
139
140	if (dowrite)
141	{	159	{
142	/* write: check length and adjust. */	160	dSP;
143	if (length < 0 || length + dataoffset > svlen)	161
144	length = svlen - dataoffset;	162	ENTER;
		163	SAVETMPS;
		164	PUSHMARK (SP);
		165	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		166	PUTBACK;
		167	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		168	SPAGAIN;
		169	FREETMPS;
		170	LEAVE;
145	}	171	}
146	else	172	}
		173
		174	static void req_submit (eio_req *req)
		175	{
		176	eio_submit (req);
		177
		178	if (on_next_submit)
147	{	179	{
148	/* read: grow scalar as necessary */	180	dSP;
149	svptr = SvGROW (data, length + dataoffset);	181	SV *cb = sv_2mortal (on_next_submit);
		182
		183	on_next_submit = 0;
		184
		185	PUSHMARK (SP);
		186	PUTBACK;
		187	call_sv (cb, G_DISCARD | G_EVAL);
150	}	188	}
151
152	if (length < 0)
153	croak ("length must not be negative");
154
155	Newz (0, req, 1, aio_cb);
156
157	if (!req)
158	croak ("out of memory during aio_req allocation");
159
160	req->type = dowrite ? REQ_WRITE : REQ_READ;
161	req->fd = fd;
162	req->offset = offset;
163	req->length = length;
164	req->data = SvREFCNT_inc (data);
165	req->dataptr = (char *)svptr + dataoffset;
166	req->callback = SvREFCNT_inc (callback);
167
168	send_req (req);
169	}	189	}
170		190
171	static void	191	static int req_invoke (eio_req *req)
172	poll_wait ()
173	{
174	if (!nreqs)
175	return;
176
177	fd_set rfd;
178	FD_ZERO(&rfd);
179	FD_SET(respipe [0], &rfd);
180
181	select (respipe [0] + 1, &rfd, 0, 0, 0);
182	}
183
184	static int
185	poll_cb (pTHX)
186	{	192	{
187	dSP;	193	dSP;
188	int count = 0;
189	aio_req req;
190
191	{
192	/* read and signals sent by the worker threads */
193	char buf [32];
194	while (read (respipe [0], buf, 32) > 0)
195	;
196	}
197		194
198	for (;;)	195	if (req->flags & FLAG_SV2_RO_OFF)
		196	SvREADONLY_off (req->sv2);
		197
		198	if (!EIO_CANCELLED (req) && SvOK (req->callback))
199	{	199	{
200	pthread_mutex_lock (&reslock);	200	ENTER;
		201	SAVETMPS;
		202	PUSHMARK (SP);
		203	EXTEND (SP, 1);
201		204
202	req = ress;	205	switch (req->type)
203
204	if (ress)
205	{	206	{
206	ress = ress->next;	207	case EIO_READDIR:
207	if (!ress) rese = 0;
208	}
209
210	pthread_mutex_unlock (&reslock);
211
212	if (!req)
213	break;
214
215	nreqs--;
216
217	if (req->type == REQ_QUIT)
218	started--;
219	else
220	{
221	int errorno = errno;
222	errno = req->errorno;
223
224	if (req->type == REQ_READ)
225	SvCUR_set (req->data, req->dataoffset
226	+ req->result > 0 ? req->result : 0);
227
228	if (req->data)
229	SvREFCNT_dec (req->data);
230
231	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
232	{	208	{
233	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	209	SV *rv = &PL_sv_undef;
234	PL_laststatval = req->result;
235	PL_statcache = *(req->statdata);
236		210
237	Safefree (req->statdata);	211	if (req->result >= 0)
		212	{
		213	int i;
		214	char *buf = req->ptr2;
		215	AV *av = newAV ();
		216
		217	av_extend (av, req->result - 1);
		218
		219	for (i = 0; i < req->result; ++i)
		220	{
		221	SV *sv = newSVpv (buf, 0);
		222
		223	av_store (av, i, sv);
		224	buf += SvCUR (sv) + 1;
		225	}
		226
		227	rv = sv_2mortal (newRV_noinc ((SV *)av));
		228	}
		229
		230	PUSHs (rv);
238	}	231	}
		232	break;
239		233
240	PUSHMARK (SP);	234	case EIO_OPEN:
241	XPUSHs (sv_2mortal (newSViv (req->result)));
242
243	if (req->type == REQ_OPEN)
244	{	235	{
245	/* convert fd to fh */	236	/* convert fd to fh */
246	SV *fh;	237	SV *fh = &PL_sv_undef;
247		238
248	PUTBACK;	239	if (req->result >= 0)
249	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	240	{
250	SPAGAIN;	241	GV *gv = (GV *)sv_newmortal ();
		242	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		243	char sym [64];
		244	int symlen;
		245
		246	symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
		247	gv_init (gv, stash, sym, symlen, 0);
251		248
252	fh = POPs;	249	symlen = snprintf (
		250	sym,
		251	sizeof (sym),
		252	"%s&=%d",
		253	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		254	req->result
		255	);
253		256
254	PUSHMARK (SP);	257	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		258	fh = (SV *)gv;
		259	}
		260
255	XPUSHs (fh);	261	PUSHs (fh);
256	}	262	}
257
258	PUTBACK;
259	call_sv (req->callback, G_VOID | G_EVAL);
260	SPAGAIN;
261
262	if (req->callback)
263	SvREFCNT_dec (req->callback);
264
265	errno = errorno;
266	count++;
267	}
268
269	Safefree (req);
270	}
271
272	return count;
273	}
274
275	static void *
276	aio_proc (void *thr_arg)
277	{
278	aio_req req;
279	int type;
280
281	do
282	{
283	pthread_mutex_lock (&reqlock);
284
285	for (;;)
286	{
287	req = reqs;
288
289	if (reqs)
290	{
291	reqs = reqs->next;
292	if (!reqs) reqe = 0;
293	}
294
295	if (req)
296	break;	263	break;
297		264
298	pthread_cond_wait (&reqwait, &reqlock);	265	case EIO_GROUP:
299	}	266	req->int1 = 2; /* mark group as finished */
300		267
301	pthread_mutex_unlock (&reqlock);	268	if (req->sv1)
302
303	errno = 0; /* strictly unnecessary */
304
305	type = req->type;
306
307	switch (type)
308	{	269	{
309	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;	270	int i;
310	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;	271	AV *av = (AV *)req->sv1;
311	#if SYS_readahead
312	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
313	#else
314	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
315	#endif
316		272
317	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	273	EXTEND (SP, AvFILL (av) + 1);
318	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	274	for (i = 0; i <= AvFILL (av); ++i)
319	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	275	PUSHs (*av_fetch (av, i, 0));
320		276	}
321	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
322	case REQ_CLOSE: req->result = close (req->fd); break;
323	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
324
325	case REQ_FSYNC: req->result = fsync (req->fd); break;
326	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
327
328	case REQ_QUIT:
329	break;	277	break;
330		278
		279	case EIO_NOP:
		280	case EIO_BUSY:
		281	break;
		282
		283	case EIO_READLINK:
		284	if (req->result > 0)
		285	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		286	break;
		287
		288	case EIO_STAT:
		289	case EIO_LSTAT:
		290	case EIO_FSTAT:
		291	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		292	PL_laststatval = req->result;
		293	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		294	PUSHs (sv_2mortal (newSViv (req->result)));
		295	break;
		296
		297	case EIO_READ:
		298	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		299	*SvEND (req->sv2) = 0;
		300	PUSHs (sv_2mortal (newSViv (req->result)));
		301	break;
		302
		303	case EIO_DUP2:
		304	if (req->result > 0)
		305	req->result = 0;
		306	/* FALLTHROUGH */
		307
331	default:	308	default:
332	req->result = ENOSYS;	309	PUSHs (sv_2mortal (newSViv (req->result)));
333	break;	310	break;
334	}	311	}
335		312
336	req->errorno = errno;	313	errno = req->errorno;
337		314
338	pthread_mutex_lock (&reslock);	315	PUTBACK;
		316	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		317	SPAGAIN;
339		318
340	req->next = 0;	319	FREETMPS;
		320	LEAVE;
341		321
342	if (rese)	322	PUTBACK;
343	{
344	rese->next = req;
345	rese = req;
346	}
347	else
348	{
349	rese = ress = req;
350
351	/* write a dummy byte to the pipe so fh becomes ready */
352	write (respipe [1], &respipe, 1);
353	}
354
355	pthread_mutex_unlock (&reslock);
356	}	323	}
357	while (type != REQ_QUIT);
358		324
		325	return !!SvTRUE (ERRSV);
		326	}
		327
		328	static void req_destroy (aio_req req)
		329	{
		330	if (req->self)
		331	{
		332	sv_unmagic (req->self, PERL_MAGIC_ext);
		333	SvREFCNT_dec (req->self);
		334	}
		335
		336	SvREFCNT_dec (req->sv1);
		337	SvREFCNT_dec (req->sv2);
		338	SvREFCNT_dec (req->callback);
		339
		340	Safefree (req);
		341	}
		342
		343	static void req_cancel_subs (aio_req grp)
		344	{
		345	aio_req sub;
		346
		347	if (grp->type != EIO_GROUP)
		348	return;
		349
		350	SvREFCNT_dec (grp->sv2);
		351	grp->sv2 = 0;
		352
		353	eio_grp_cancel (grp);
		354	}
		355
		356	#ifdef USE_SOCKETS_AS_HANDLES
		357	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		358	#else
		359	# define TO_SOCKET(x) (x)
		360	#endif
		361
		362	static void
		363	create_respipe (void)
		364	{
		365	int old_readfd = respipe [0];
		366
		367	if (respipe [1] >= 0)
		368	respipe_close (TO_SOCKET (respipe [1]));
		369
		370	#ifdef _WIN32
		371	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		372	#else
		373	if (pipe (respipe))
		374	#endif
		375	croak ("unable to initialize result pipe");
		376
		377	if (old_readfd >= 0)
		378	{
		379	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		380	croak ("unable to initialize result pipe(2)");
		381
		382	respipe_close (respipe [0]);
		383	respipe [0] = old_readfd;
		384	}
		385
		386	#ifdef _WIN32
		387	int arg = 1;
		388	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		389	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		390	#else
		391	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		392	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		393	#endif
		394	croak ("unable to initialize result pipe(3)");
		395
		396	respipe_osf [0] = TO_SOCKET (respipe [0]);
		397	respipe_osf [1] = TO_SOCKET (respipe [1]);
		398	}
		399
		400	static void poll_wait (void)
		401	{
		402	fd_set rfd;
		403
		404	while (eio_nreqs ())
		405	{
		406	int size;
		407
		408	X_LOCK (reslock);
		409	size = res_queue.size;
		410	X_UNLOCK (reslock);
		411
		412	if (size)
		413	return;
		414
		415	maybe_start_thread ();
		416
		417	FD_ZERO (&rfd);
		418	FD_SET (respipe [0], &rfd);
		419
		420	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
		421	}
		422	}
		423
		424	static int poll_cb (void)
		425	{
		426	int res;
		427
		428	do
		429	{
		430	res = eio_poll ();
		431
		432	if (res > 0)
		433	croak (0);
		434	}
		435	while (max_outstanding && max_outstanding <= eio_nreqs ());
		436
359	return 0;	437	return res;
360	}	438	}
361		439
		440	static void atfork_child (void)
		441	{
		442	create_respipe ();
		443	}
		444
		445	#define dREQ \
		446	aio_req req; \
		447	int req_pri = next_pri; \
		448	next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS; \
		449	\
		450	if (SvOK (callback) && !SvROK (callback)) \
		451	croak ("callback must be undef or of reference type"); \
		452	\
		453	Newz (0, req, 1, eio_req); \
		454	if (!req) \
		455	croak ("out of memory during eio_req allocation"); \
		456	\
		457	req->callback = newSVsv (callback); \
		458	req->pri = req_pri
		459
		460	#define REQ_SEND \
		461	req_submit (req); \
		462	\
		463	if (GIMME_V != G_VOID) \
		464	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		465
362	MODULE = IO::AIO PACKAGE = IO::AIO	466	MODULE = IO::AIO PACKAGE = IO::AIO
363		467
		468	PROTOTYPES: ENABLE
		469
364	BOOT:	470	BOOT:
365	{	471	{
366	if (pipe (respipe))	472	stash = gv_stashpv ("IO::AIO", 1);
367	croak ("unable to initialize result pipe");
368		473
369	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	474	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
370	croak ("cannot set result pipe to nonblocking mode");	475	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		476	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		477	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		478	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		479	#ifdef _WIN32
		480	X_MUTEX_CHECK (wrklock);
		481	X_MUTEX_CHECK (reslock);
		482	X_MUTEX_CHECK (reqlock);
		483	X_MUTEX_CHECK (reqwait);
		484	X_MUTEX_CHECK (preadwritelock);
		485	X_MUTEX_CHECK (readdirlock);
371		486
372	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	487	X_COND_CHECK (reqwait);
373	croak ("cannot set result pipe to nonblocking mode");	488	#else
374	}	489	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		490	#endif
375		491
		492	create_respipe ();
		493
		494	if (eio_init (want_poll, done_poll) < 0)
		495	croak ("IO::AIO: unable to initialise eio library");
		496
		497	/* atfork child called in fifo order, so before eio's handler */
		498	X_THREAD_ATFORK (0, 0, atfork_child);
		499	}
		500
376	void	501	void
377	min_parallel(nthreads)	502	max_poll_reqs (int nreqs)
378	int nthreads
379	PROTOTYPE: $	503	PROTOTYPE: $
380	CODE:	504	CODE:
381	while (nthreads > started)	505	eio_set_max_poll_reqs (nreqs);
382	start_thread ();
383		506
384	void	507	void
385	max_parallel(nthreads)	508	max_poll_time (double nseconds)
386	int nthreads
387	PROTOTYPE: $	509	PROTOTYPE: $
388	CODE:	510	CODE:
		511	eio_set_max_poll_time (nseconds);
		512
		513	void
		514	min_parallel (int nthreads)
		515	PROTOTYPE: $
		516	CODE:
		517	eio_set_min_parallel (nthreads);
		518
		519	void
		520	max_parallel (int nthreads)
		521	PROTOTYPE: $
		522	CODE:
		523	eio_set_max_parallel (nthreads);
		524
		525	void
		526	max_idle (int nthreads)
		527	PROTOTYPE: $
		528	CODE:
		529	eio_set_max_idle (nthreads);
		530
		531	void
		532	max_outstanding (int maxreqs)
		533	PROTOTYPE: $
		534	CODE:
		535	max_outstanding = maxreqs;
		536
		537	void
		538	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
		539	PROTOTYPE: $$$;$
		540	PPCODE:
389	{	541	{
390	int cur = started;	542	dREQ;
391	while (cur > nthreads)	543
392	{	544	req->type = EIO_OPEN;
393	end_thread ();	545	req->sv1 = newSVsv (pathname);
		546	req->ptr1 = SvPVbyte_nolen (req->sv1);
		547	req->int1 = flags;
		548	req->int2 = mode;
		549
		550	REQ_SEND;
		551	}
		552
		553	void
		554	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
		555	PROTOTYPE: $;$
		556	ALIAS:
		557	aio_fsync = EIO_FSYNC
		558	aio_fdatasync = EIO_FDATASYNC
		559	PPCODE:
		560	{
		561	dREQ;
		562
		563	req->type = ix;
		564	req->sv1 = newSVsv (fh);
		565	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		566
		567	REQ_SEND (req);
		568	}
		569
		570	void
		571	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		572	PROTOTYPE: $;$
		573	PPCODE:
		574	{
		575	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		576	dREQ;
		577
		578	if (close_pipe < 0)
		579	{
		580	int pipefd [2];
		581
		582	if (pipe (pipefd) < 0
		583	|| close (pipefd [1]) < 0
		584	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		585	abort (); /*D*/
		586
		587	close_pipe = pipefd [0];
		588	}
		589
		590	req->type = EIO_DUP2;
		591	req->int1 = close_pipe;
		592	req->sv2 = newSVsv (fh);
		593	req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		594
		595	REQ_SEND (req);
		596	}
		597
		598	void
		599	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
		600	ALIAS:
		601	aio_read = EIO_READ
		602	aio_write = EIO_WRITE
		603	PROTOTYPE: $$$$$;$
		604	PPCODE:
		605	{
		606	STRLEN svlen;
		607	char *svptr = SvPVbyte (data, svlen);
		608	UV len = SvUV (length);
		609
		610	SvUPGRADE (data, SVt_PV);
		611	SvPOK_on (data);
		612
		613	if (dataoffset < 0)
		614	dataoffset += svlen;
		615
		616	if (dataoffset < 0 || dataoffset > svlen)
		617	croak ("dataoffset outside of data scalar");
		618
		619	if (ix == EIO_WRITE)
		620	{
		621	/* write: check length and adjust. */
		622	if (!SvOK (length) || len + dataoffset > svlen)
		623	len = svlen - dataoffset;
		624	}
		625	else
		626	{
		627	/* read: grow scalar as necessary */
		628	svptr = SvGROW (data, len + dataoffset + 1);
		629	}
		630
		631	if (len < 0)
		632	croak ("length must not be negative");
		633
		634	{
		635	dREQ;
		636
		637	req->type = ix;
		638	req->sv1 = newSVsv (fh);
		639	req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
		640	: IoOFP (sv_2io (fh)));
		641	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		642	req->size = len;
		643	req->sv2 = SvREFCNT_inc (data);
		644	req->ptr2 = (char *)svptr + dataoffset;
		645	req->stroffset = dataoffset;
		646
		647	if (!SvREADONLY (data))
394	cur--;	648	{
		649	SvREADONLY_on (data);
		650	req->flags |= FLAG_SV2_RO_OFF;
395	}	651	}
396		652
397	while (started > nthreads)	653	REQ_SEND;
		654	}
		655	}
		656
		657	void
		658	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		659	PROTOTYPE: $$;$
		660	PPCODE:
		661	{
		662	SV *data;
		663	dREQ;
		664
		665	req->type = EIO_READLINK;
		666	req->sv1 = newSVsv (path);
		667	req->ptr1 = SvPVbyte_nolen (req->sv1);
		668
		669	REQ_SEND;
		670	}
		671
		672	void
		673	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		674	PROTOTYPE: $$$$;$
		675	PPCODE:
		676	{
		677	dREQ;
		678
		679	req->type = EIO_SENDFILE;
		680	req->sv1 = newSVsv (out_fh);
		681	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		682	req->sv2 = newSVsv (in_fh);
		683	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		684	req->offs = SvVAL64 (in_offset);
		685	req->size = length;
		686
		687	REQ_SEND;
		688	}
		689
		690	void
		691	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
		692	PROTOTYPE: $$$;$
		693	PPCODE:
		694	{
		695	dREQ;
		696
		697	req->type = EIO_READAHEAD;
		698	req->sv1 = newSVsv (fh);
		699	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		700	req->offs = SvVAL64 (offset);
		701	req->size = length;
		702
		703	REQ_SEND;
		704	}
		705
		706	void
		707	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
		708	ALIAS:
		709	aio_stat = EIO_STAT
		710	aio_lstat = EIO_LSTAT
		711	PPCODE:
		712	{
		713	dREQ;
		714
		715	req->sv1 = newSVsv (fh_or_path);
		716
		717	if (SvPOK (req->sv1))
		718	{
		719	req->type = ix;
		720	req->ptr1 = SvPVbyte_nolen (req->sv1);
		721	}
		722	else
		723	{
		724	req->type = EIO_FSTAT;
		725	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		726	}
		727
		728	REQ_SEND;
		729	}
		730
		731	void
		732	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		733	PPCODE:
		734	{
		735	dREQ;
		736
		737	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		738	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		739	req->sv1 = newSVsv (fh_or_path);
		740
		741	if (SvPOK (req->sv1))
		742	{
		743	req->type = EIO_UTIME;
		744	req->ptr1 = SvPVbyte_nolen (req->sv1);
		745	}
		746	else
		747	{
		748	req->type = EIO_FUTIME;
		749	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		750	}
		751
		752	REQ_SEND;
		753	}
		754
		755	void
		756	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		757	PPCODE:
		758	{
		759	dREQ;
		760
		761	req->sv1 = newSVsv (fh_or_path);
		762	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		763
		764	if (SvPOK (req->sv1))
		765	{
		766	req->type = EIO_TRUNCATE;
		767	req->ptr1 = SvPVbyte_nolen (req->sv1);
		768	}
		769	else
		770	{
		771	req->type = EIO_FTRUNCATE;
		772	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		773	}
		774
		775	REQ_SEND;
		776	}
		777
		778	void
		779	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		780	ALIAS:
		781	aio_chmod = EIO_CHMOD
		782	aio_mkdir = EIO_MKDIR
		783	PPCODE:
		784	{
		785	dREQ;
		786
		787	req->int2 = mode;
		788	req->sv1 = newSVsv (fh_or_path);
		789
		790	if (SvPOK (req->sv1))
		791	{
		792	req->type = ix;
		793	req->ptr1 = SvPVbyte_nolen (req->sv1);
		794	}
		795	else
		796	{
		797	req->type = EIO_FCHMOD;
		798	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		799	}
		800
		801	REQ_SEND;
		802	}
		803
		804	void
		805	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		806	PPCODE:
		807	{
		808	dREQ;
		809
		810	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		811	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		812	req->sv1 = newSVsv (fh_or_path);
		813
		814	if (SvPOK (req->sv1))
		815	{
		816	req->type = EIO_CHOWN;
		817	req->ptr1 = SvPVbyte_nolen (req->sv1);
		818	}
		819	else
		820	{
		821	req->type = EIO_FCHOWN;
		822	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		823	}
		824
		825	REQ_SEND;
		826	}
		827
		828	void
		829	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
		830	ALIAS:
		831	aio_unlink = EIO_UNLINK
		832	aio_rmdir = EIO_RMDIR
		833	aio_readdir = EIO_READDIR
		834	PPCODE:
		835	{
		836	dREQ;
		837
		838	req->type = ix;
		839	req->sv1 = newSVsv (pathname);
		840	req->ptr1 = SvPVbyte_nolen (req->sv1);
		841
		842	REQ_SEND;
		843	}
		844
		845	void
		846	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		847	ALIAS:
		848	aio_link = EIO_LINK
		849	aio_symlink = EIO_SYMLINK
		850	aio_rename = EIO_RENAME
		851	PPCODE:
		852	{
		853	dREQ;
		854
		855	req->type = ix;
		856	req->sv1 = newSVsv (oldpath);
		857	req->ptr1 = SvPVbyte_nolen (req->sv1);
		858	req->sv2 = newSVsv (newpath);
		859	req->ptr2 = SvPVbyte_nolen (req->sv2);
		860
		861	REQ_SEND;
		862	}
		863
		864	void
		865	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		866	PPCODE:
		867	{
		868	dREQ;
		869
		870	req->type = EIO_MKNOD;
		871	req->sv1 = newSVsv (pathname);
		872	req->ptr1 = SvPVbyte_nolen (req->sv1);
		873	req->int2 = (mode_t)mode;
		874	req->offs = dev;
		875
		876	REQ_SEND;
		877	}
		878
		879	void
		880	aio_busy (double delay, SV *callback=&PL_sv_undef)
		881	PPCODE:
		882	{
		883	dREQ;
		884
		885	req->type = EIO_BUSY;
		886	req->nv1 = delay < 0. ? 0. : delay;
		887
		888	REQ_SEND;
		889	}
		890
		891	void
		892	aio_group (SV *callback=&PL_sv_undef)
		893	PROTOTYPE: ;$
		894	PPCODE:
		895	{
		896	dREQ;
		897
		898	req->type = EIO_GROUP;
		899
		900	eio_submit (req);
		901	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		902	}
		903
		904	void
		905	aio_nop (SV *callback=&PL_sv_undef)
		906	ALIAS:
		907	aio_nop = EIO_NOP
		908	aio_sync = EIO_SYNC
		909	PPCODE:
		910	{
		911	dREQ;
		912
		913	req->type = ix;
		914
		915	REQ_SEND;
		916	}
		917
		918	int
		919	aioreq_pri (int pri = 0)
		920	PROTOTYPE: ;$
		921	CODE:
		922	RETVAL = next_pri - EIO_PRI_BIAS;
		923	if (items > 0)
		924	{
		925	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		926	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		927	next_pri = pri + EIO_PRI_BIAS;
		928	}
		929	OUTPUT:
		930	RETVAL
		931
		932	void
		933	aioreq_nice (int nice = 0)
		934	CODE:
		935	nice = next_pri - nice;
		936	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		937	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		938	next_pri = nice + EIO_PRI_BIAS;
		939
		940	void
		941	flush ()
		942	PROTOTYPE:
		943	CODE:
		944	while (eio_nreqs ())
398	{	945	{
399	poll_wait ();	946	poll_wait ();
400	poll_cb (aTHX);	947	poll_cb ();
401	}
402	}
403
404	void
405	aio_open(pathname,flags,mode,callback)
406	SV * pathname
407	int flags
408	int mode
409	SV * callback
410	PROTOTYPE: $$$$
411	CODE:
412	{
413	aio_req req;
414
415	Newz (0, req, 1, aio_cb);
416
417	if (!req)
418	croak ("out of memory during aio_req allocation");
419
420	req->type = REQ_OPEN;
421	req->data = newSVsv (pathname);
422	req->dataptr = SvPV_nolen (req->data);
423	req->fd = flags;
424	req->mode = mode;
425	req->callback = SvREFCNT_inc (callback);
426
427	send_req (req);
428	}
429
430	void
431	aio_close(fh,callback)
432	InputStream fh
433	SV * callback
434	PROTOTYPE: $$
435	ALIAS:
436	aio_close = REQ_CLOSE
437	aio_fsync = REQ_FSYNC
438	aio_fdatasync = REQ_FDATASYNC
439	CODE:
440	{
441	aio_req req;
442
443	Newz (0, req, 1, aio_cb);
444
445	if (!req)
446	croak ("out of memory during aio_req allocation");
447
448	req->type = ix;
449	req->fd = PerlIO_fileno (fh);
450	req->callback = SvREFCNT_inc (callback);
451
452	send_req (req);
453	}
454
455	void
456	aio_read(fh,offset,length,data,dataoffset,callback)
457	InputStream fh
458	UV offset
459	IV length
460	SV * data
461	IV dataoffset
462	SV * callback
463	PROTOTYPE: $$$$$$
464	CODE:
465	read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
466
467	void
468	aio_write(fh,offset,length,data,dataoffset,callback)
469	OutputStream fh
470	UV offset
471	IV length
472	SV * data
473	IV dataoffset
474	SV * callback
475	PROTOTYPE: $$$$$$
476	CODE:
477	read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
478
479	void
480	aio_readahead(fh,offset,length,callback)
481	InputStream fh
482	UV offset
483	IV length
484	SV * callback
485	PROTOTYPE: $$$$
486	CODE:
487	{
488	aio_req req;
489
490	if (length < 0)
491	croak ("length must not be negative");
492
493	Newz (0, req, 1, aio_cb);
494
495	if (!req)
496	croak ("out of memory during aio_req allocation");
497
498	req->type = REQ_READAHEAD;
499	req->fd = PerlIO_fileno (fh);
500	req->offset = offset;
501	req->length = length;
502	req->callback = SvREFCNT_inc (callback);
503
504	send_req (req);
505	}
506
507	void
508	aio_stat(fh_or_path,callback)
509	SV * fh_or_path
510	SV * callback
511	PROTOTYPE: $$
512	ALIAS:
513	aio_lstat = 1
514	CODE:
515	{
516	aio_req req;
517
518	Newz (0, req, 1, aio_cb);
519
520	if (!req)
521	croak ("out of memory during aio_req allocation");
522
523	New (0, req->statdata, 1, Stat_t);
524
525	if (!req->statdata)
526	croak ("out of memory during aio_req->statdata allocation");
527
528	if (SvPOK (fh_or_path))
529	{	948	}
530	req->type = ix ? REQ_LSTAT : REQ_STAT;
531	req->data = newSVsv (fh_or_path);
532	req->dataptr = SvPV_nolen (req->data);
533	}
534	else
535	{
536	req->type = REQ_FSTAT;
537	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
538	}
539		949
540	req->callback = SvREFCNT_inc (callback);	950	int
541		951	poll()
542	send_req (req);
543	}
544
545	void
546	aio_unlink(pathname,callback)
547	SV * pathname
548	SV * callback
549	PROTOTYPE: $$	952	PROTOTYPE:
550	CODE:	953	CODE:
551	{	954	poll_wait ();
552	aio_req req;	955	RETVAL = poll_cb ();
553		956	OUTPUT:
554	Newz (0, req, 1, aio_cb);	957	RETVAL
555
556	if (!req)
557	croak ("out of memory during aio_req allocation");
558
559	req->type = REQ_UNLINK;
560	req->data = newSVsv (pathname);
561	req->dataptr = SvPV_nolen (req->data);
562	req->callback = SvREFCNT_inc (callback);
563
564	send_req (req);
565	}
566		958
567	int	959	int
568	poll_fileno()	960	poll_fileno()
569	PROTOTYPE:	961	PROTOTYPE:
570	CODE:	962	CODE:
…		…
574		966
575	int	967	int
576	poll_cb(...)	968	poll_cb(...)
577	PROTOTYPE:	969	PROTOTYPE:
578	CODE:	970	CODE:
579	RETVAL = poll_cb (aTHX);	971	RETVAL = poll_cb ();
580	OUTPUT:	972	OUTPUT:
581	RETVAL	973	RETVAL
582		974
583	void	975	void
584	poll_wait()	976	poll_wait()
585	PROTOTYPE:	977	PROTOTYPE:
586	CODE:	978	CODE:
587	if (nreqs)
588	poll_wait ();	979	poll_wait ();
589		980
590	int	981	int
591	nreqs()	982	nreqs()
592	PROTOTYPE:	983	PROTOTYPE:
593	CODE:	984	CODE:
594	RETVAL = nreqs;	985	RETVAL = eio_nreqs ();
595	OUTPUT:	986	OUTPUT:
596	RETVAL	987	RETVAL
597		988
		989	int
		990	nready()
		991	PROTOTYPE:
		992	CODE:
		993	RETVAL = eio_nready ();
		994	OUTPUT:
		995	RETVAL
		996
		997	int
		998	npending()
		999	PROTOTYPE:
		1000	CODE:
		1001	RETVAL = eio_npending ();
		1002	OUTPUT:
		1003	RETVAL
		1004
		1005	int
		1006	nthreads()
		1007	PROTOTYPE:
		1008	CODE:
		1009	if (WORDACCESS_UNSAFE) X_LOCK (wrklock);
		1010	RETVAL = started;
		1011	if (WORDACCESS_UNSAFE) X_UNLOCK (wrklock);
		1012	OUTPUT:
		1013	RETVAL
		1014
		1015	void _on_next_submit (SV *cb)
		1016	CODE:
		1017	SvREFCNT_dec (on_next_submit);
		1018	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1019
		1020	PROTOTYPES: DISABLE
		1021
		1022	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1023
		1024	void
		1025	cancel (aio_req_ornot req)
		1026	CODE:
		1027	eio_cancel (req);
		1028
		1029	void
		1030	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1031	CODE:
		1032	SvREFCNT_dec (req->callback);
		1033	req->callback = newSVsv (callback);
		1034
		1035	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1036
		1037	void
		1038	add (aio_req grp, ...)
		1039	PPCODE:
		1040	{
		1041	int i;
		1042
		1043	if (grp->int1 == 2)
		1044	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1045
		1046	for (i = 1; i < items; ++i )
		1047	{
		1048	aio_req req;
		1049
		1050	if (GIMME_V != G_VOID)
		1051	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1052
		1053	req = SvAIO_REQ (ST (i));
		1054
		1055	if (req)
		1056	eio_grp_add (grp, req);
		1057	}
		1058	}
		1059
		1060	void
		1061	cancel_subs (aio_req_ornot req)
		1062	CODE:
		1063	req_cancel_subs (req);
		1064
		1065	void
		1066	result (aio_req grp, ...)
		1067	CODE:
		1068	{
		1069	int i;
		1070	AV *av;
		1071
		1072	grp->errorno = errno;
		1073
		1074	av = newAV ();
		1075
		1076	for (i = 1; i < items; ++i )
		1077	av_push (av, newSVsv (ST (i)));
		1078
		1079	SvREFCNT_dec (grp->sv1);
		1080	grp->sv1 = (SV *)av;
		1081	}
		1082
		1083	void
		1084	errno (aio_req grp, int errorno = errno)
		1085	CODE:
		1086	grp->errorno = errorno;
		1087
		1088	void
		1089	limit (aio_req grp, int limit)
		1090	CODE:
		1091	eio_grp_limit (grp, limit);
		1092
		1093	void
		1094	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1095	CODE:
		1096	{
		1097	SvREFCNT_dec (grp->sv2);
		1098	grp->sv2 = newSVsv (callback);
		1099
		1100	if (grp->int2 <= 0)
		1101	grp->int2 = 2;
		1102
		1103	eio_grp_limit (grp, grp->int2);
		1104	}
		1105

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