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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.4 by root, Sun Jul 10 20:57:00 2005 UTC vs.
Revision 1.125 by root, Thu Jun 19 09:05:43 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 __ia64	23	# define EIO_STRUCT_DIRENT Direntry_t
23	# 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
24	#else	59	#else
25	# 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
26	#endif	68	#endif
27		69
		70	/* perl stupidly overrides readdir and maybe others */
		71	/* with thread-unsafe versions, imagine that :( */
		72	#undef readdir
		73	#undef opendir
		74	#undef closedir
		75
		76	#define EIO_STRUCT_STAT Stat_t
		77
		78	/* use NV for 32 bit perls as it allows larger offsets */
		79	#if IVSIZE >= 8
		80	# define SvVAL64 SvIV
		81	#else
		82	# define SvVAL64 SvNV
		83	#endif
		84
		85	static HV *stash;
		86	typedef SV SV8; /* byte-sv, used for argument-checking */
		87
		88	#define AIO_REQ_KLASS "IO::AIO::REQ"
		89	#define AIO_GRP_KLASS "IO::AIO::GRP"
		90
		91	#define EIO_REQ_MEMBERS \
		92	SV *callback; \
		93	SV *sv1, *sv2; \
		94	STRLEN stroffset; \
		95	SV *self;
		96
		97	#define EIO_NO_WRAPPERS 1
		98
		99	#include "libeio/eio.h"
		100
		101	static int req_invoke (eio_req *req);
		102	#define EIO_FINISH(req) req_invoke (req)
		103	static void aio_grp_feed (eio_req *grp);
		104	#define EIO_FEED(req) aio_grp_feed (req)
		105	static void req_destroy (eio_req *grp);
		106	#define EIO_DESTROY(req) req_destroy (req)
		107
28	enum {	108	enum {
29	REQ_QUIT,	109	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
30	REQ_OPEN, REQ_CLOSE,
31	REQ_READ, REQ_WRITE, REQ_READAHEAD,
32	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
33	REQ_FSYNC, REQ_FDATASYNC,
34	};	110	};
35		111
36	typedef struct aio_cb {	112	#include "libeio/eio.c"
37	struct aio_cb *volatile next;
38		113
39	int type;
40
41	int fd;
42	off_t offset;
43	size_t length;
44	ssize_t result;
45	mode_t mode; /* open */
46	int errorno;
47	SV *data, *callback;
48	void *dataptr;
49	STRLEN dataoffset;
50
51	Stat_t *statdata;
52	} aio_cb;
53
54	typedef aio_cb *aio_req;	114	typedef eio_req *aio_req;
		115	typedef eio_req *aio_req_ornot;
55		116
56	static int started;	117	static SV *on_next_submit;
57	static int nreqs;	118	static int next_pri = EIO_PRI_DEFAULT;
58	static int max_outstanding = 1<<30;	119	static int max_outstanding;
59	static int respipe [2];
60		120
61	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	121	static int respipe_osf [2], respipe [2] = { -1, -1 };
62	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
63	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
64		122
65	static volatile aio_req reqs, reqe; /* queue start, queue end */	123	static void req_destroy (aio_req req);
66	static volatile aio_req ress, rese; /* queue start, queue end */	124	static void req_cancel (aio_req req);
		125
		126	static void want_poll (void)
		127	{
		128	/* write a dummy byte to the pipe so fh becomes ready */
		129	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
		130	}
		131
		132	static void done_poll (void)
		133	{
		134	/* read any signals sent by the worker threads */
		135	char buf [4];
		136	while (respipe_read (respipe [0], buf, 4) == 4)
		137	;
		138	}
		139
		140	/* must be called at most once */
		141	static SV *req_sv (aio_req req, const char *klass)
		142	{
		143	if (!req->self)
		144	{
		145	req->self = (SV *)newHV ();
		146	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		147	}
		148
		149	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		150	}
		151
		152	static aio_req SvAIO_REQ (SV *sv)
		153	{
		154	MAGIC *mg;
		155
		156	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		157	croak ("object of class " AIO_REQ_KLASS " expected");
		158
		159	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		160
		161	return mg ? (aio_req)mg->mg_ptr : 0;
		162	}
		163
		164	static void aio_grp_feed (aio_req grp)
		165	{
		166	if (grp->sv2 && SvOK (grp->sv2))
		167	{
		168	dSP;
		169
		170	ENTER;
		171	SAVETMPS;
		172	PUSHMARK (SP);
		173	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		174	PUTBACK;
		175	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		176	SPAGAIN;
		177	FREETMPS;
		178	LEAVE;
		179	}
		180	}
		181
		182	static void req_submit (eio_req *req)
		183	{
		184	eio_submit (req);
		185
		186	if (on_next_submit)
		187	{
		188	dSP;
		189	SV *cb = sv_2mortal (on_next_submit);
		190
		191	on_next_submit = 0;
		192
		193	PUSHMARK (SP);
		194	PUTBACK;
		195	call_sv (cb, G_DISCARD | G_EVAL);
		196	}
		197	}
		198
		199	static int req_invoke (eio_req *req)
		200	{
		201	dSP;
		202
		203	if (req->flags & FLAG_SV2_RO_OFF)
		204	SvREADONLY_off (req->sv2);
		205
		206	if (!EIO_CANCELLED (req) && SvOK (req->callback))
		207	{
		208	ENTER;
		209	SAVETMPS;
		210	PUSHMARK (SP);
		211	EXTEND (SP, 1);
		212
		213	switch (req->type)
		214	{
		215	case EIO_READDIR:
		216	{
		217	SV *rv = &PL_sv_undef;
		218
		219	if (req->result >= 0)
		220	{
		221	int i;
		222	char *buf = req->ptr2;
		223	AV *av = newAV ();
		224
		225	av_extend (av, req->result - 1);
		226
		227	for (i = 0; i < req->result; ++i)
		228	{
		229	SV *sv = newSVpv (buf, 0);
		230
		231	av_store (av, i, sv);
		232	buf += SvCUR (sv) + 1;
		233	}
		234
		235	rv = sv_2mortal (newRV_noinc ((SV *)av));
		236	}
		237
		238	PUSHs (rv);
		239	}
		240	break;
		241
		242	case EIO_OPEN:
		243	{
		244	/* convert fd to fh */
		245	SV *fh = &PL_sv_undef;
		246
		247	if (req->result >= 0)
		248	{
		249	GV *gv = (GV *)sv_newmortal ();
		250	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		251	char sym [64];
		252	int symlen;
		253
		254	symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
		255	gv_init (gv, stash, sym, symlen, 0);
		256
		257	symlen = snprintf (
		258	sym,
		259	sizeof (sym),
		260	"%s&=%d",
		261	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		262	req->result
		263	);
		264
		265	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		266	fh = (SV *)gv;
		267	}
		268
		269	PUSHs (fh);
		270	}
		271	break;
		272
		273	case EIO_GROUP:
		274	req->int1 = 2; /* mark group as finished */
		275
		276	if (req->sv1)
		277	{
		278	int i;
		279	AV *av = (AV *)req->sv1;
		280
		281	EXTEND (SP, AvFILL (av) + 1);
		282	for (i = 0; i <= AvFILL (av); ++i)
		283	PUSHs (*av_fetch (av, i, 0));
		284	}
		285	break;
		286
		287	case EIO_NOP:
		288	case EIO_BUSY:
		289	break;
		290
		291	case EIO_READLINK:
		292	if (req->result > 0)
		293	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		294	break;
		295
		296	case EIO_STAT:
		297	case EIO_LSTAT:
		298	case EIO_FSTAT:
		299	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		300	PL_laststatval = req->result;
		301	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		302	PUSHs (sv_2mortal (newSViv (req->result)));
		303	break;
		304
		305	case EIO_READ:
		306	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		307	*SvEND (req->sv2) = 0;
		308	PUSHs (sv_2mortal (newSViv (req->result)));
		309	break;
		310
		311	case EIO_DUP2:
		312	if (req->result > 0)
		313	req->result = 0;
		314	/* FALLTHROUGH */
		315
		316	default:
		317	PUSHs (sv_2mortal (newSViv (req->result)));
		318	break;
		319	}
		320
		321	errno = req->errorno;
		322
		323	PUTBACK;
		324	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		325	SPAGAIN;
		326
		327	FREETMPS;
		328	LEAVE;
		329
		330	PUTBACK;
		331	}
		332
		333	return !!SvTRUE (ERRSV);
		334	}
		335
		336	static void req_destroy (aio_req req)
		337	{
		338	if (req->self)
		339	{
		340	sv_unmagic (req->self, PERL_MAGIC_ext);
		341	SvREFCNT_dec (req->self);
		342	}
		343
		344	SvREFCNT_dec (req->sv1);
		345	SvREFCNT_dec (req->sv2);
		346	SvREFCNT_dec (req->callback);
		347
		348	Safefree (req);
		349	}
		350
		351	static void req_cancel_subs (aio_req grp)
		352	{
		353	aio_req sub;
		354
		355	if (grp->type != EIO_GROUP)
		356	return;
		357
		358	SvREFCNT_dec (grp->sv2);
		359	grp->sv2 = 0;
		360
		361	eio_grp_cancel (grp);
		362	}
		363
		364	#ifdef USE_SOCKETS_AS_HANDLES
		365	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		366	#else
		367	# define TO_SOCKET(x) (x)
		368	#endif
67		369
68	static void	370	static void
69	poll_wait ()	371	create_respipe (void)
70	{	372	{
71	if (!nreqs)	373	int old_readfd = respipe [0];
72	return;
73		374
		375	if (respipe [1] >= 0)
		376	respipe_close (TO_SOCKET (respipe [1]));
		377
		378	#ifdef _WIN32
		379	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		380	#else
		381	if (pipe (respipe))
		382	#endif
		383	croak ("unable to initialize result pipe");
		384
		385	if (old_readfd >= 0)
		386	{
		387	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		388	croak ("unable to initialize result pipe(2)");
		389
		390	respipe_close (respipe [0]);
		391	respipe [0] = old_readfd;
		392	}
		393
		394	#ifdef _WIN32
		395	int arg = 1;
		396	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		397	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		398	#else
		399	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		400	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		401	#endif
		402	croak ("unable to initialize result pipe(3)");
		403
		404	respipe_osf [0] = TO_SOCKET (respipe [0]);
		405	respipe_osf [1] = TO_SOCKET (respipe [1]);
		406	}
		407
		408	static void poll_wait (void)
		409	{
74	fd_set rfd;	410	fd_set rfd;
		411
		412	while (eio_nreqs ())
		413	{
		414	int size;
		415
		416	X_LOCK (reslock);
		417	size = res_queue.size;
		418	X_UNLOCK (reslock);
		419
		420	if (size)
		421	return;
		422
		423	etp_maybe_start_thread ();
		424
75	FD_ZERO(&rfd);	425	FD_ZERO (&rfd);
76	FD_SET(respipe [0], &rfd);	426	FD_SET (respipe [0], &rfd);
77		427
78	select (respipe [0] + 1, &rfd, 0, 0, 0);	428	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
79	}
80
81	static int
82	poll_cb (pTHX)
83	{
84	dSP;
85	int count = 0;
86	aio_req req;
87
88	{
89	/* read and signals sent by the worker threads */
90	char buf [32];
91	while (read (respipe [0], buf, 32) > 0)
92	;
93	}	429	}
		430	}
94		431
		432	static int poll_cb (void)
		433	{
95	for (;;)	434	for (;;)
96	{	435	{
97	pthread_mutex_lock (&reslock);	436	int res = eio_poll ();
98		437
99	req = ress;
100
101	if (ress)	438	if (res > 0)
102	{
103	ress = ress->next;
104	if (!ress) rese = 0;
105	}
106
107	pthread_mutex_unlock (&reslock);
108
109	if (!req)
110	break;	439	croak (0);
111		440
112	nreqs--;	441	if (!max_outstanding || max_outstanding > eio_nreqs ())
		442	return res;
113		443
114	if (req->type == REQ_QUIT)	444	poll_wait ();
115	started--;
116	else
117	{
118	int errorno = errno;
119	errno = req->errorno;
120
121	if (req->type == REQ_READ)
122	SvCUR_set (req->data, req->dataoffset
123	+ req->result > 0 ? req->result : 0);
124
125	if (req->data)
126	SvREFCNT_dec (req->data);
127
128	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
129	{
130	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
131	PL_laststatval = req->result;
132	PL_statcache = *(req->statdata);
133
134	Safefree (req->statdata);
135	}
136
137	PUSHMARK (SP);
138	XPUSHs (sv_2mortal (newSViv (req->result)));
139
140	if (req->type == REQ_OPEN)
141	{
142	/* convert fd to fh */
143	SV *fh;
144
145	PUTBACK;
146	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
147	SPAGAIN;
148
149	fh = POPs;
150
151	PUSHMARK (SP);
152	XPUSHs (fh);
153	}
154
155	PUTBACK;
156	call_sv (req->callback, G_VOID | G_EVAL);
157	SPAGAIN;
158
159	if (req->callback)
160	SvREFCNT_dec (req->callback);
161
162	errno = errorno;
163	count++;
164	}
165
166	Safefree (req);
167	}	445	}
168
169	return count;
170	}	446	}
171		447
172	static void *aio_proc(void *arg);	448	static void atfork_child (void)
173
174	static void
175	start_thread (void)
176	{	449	{
177	sigset_t fullsigset, oldsigset;	450	create_respipe ();
178	pthread_t tid;
179	pthread_attr_t attr;
180
181	pthread_attr_init (&attr);
182	pthread_attr_setstacksize (&attr, STACKSIZE);
183	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
184
185	sigfillset (&fullsigset);
186	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
187
188	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
189	started++;
190
191	sigprocmask (SIG_SETMASK, &oldsigset, 0);
192	}	451	}
193		452
194	static void	453	#define dREQ \
195	send_req (aio_req req)
196	{
197	nreqs++;
198
199	pthread_mutex_lock (&reqlock);
200
201	req->next = 0;
202
203	if (reqe)
204	{
205	reqe->next = req;
206	reqe = req;
207	}
208	else
209	reqe = reqs = req;
210
211	pthread_cond_signal (&reqwait);
212	pthread_mutex_unlock (&reqlock);
213
214	while (nreqs > max_outstanding)
215	{
216	poll_wait ();
217	poll_cb ();
218	}
219	}
220
221	static void
222	end_thread (void)
223	{
224	aio_req req;	454	aio_req req; \
225	New (0, req, 1, aio_cb);	455	int req_pri = next_pri; \
226	req->type = REQ_QUIT;	456	next_pri = EIO_PRI_DEFAULT; \
227		457	\
228	send_req (req);	458	if (SvOK (callback) && !SvROK (callback)) \
229	}	459	croak ("callback must be undef or of reference type"); \
230		460	\
231	static void
232	read_write (pTHX_
233	int dowrite, int fd, off_t offset, size_t length,
234	SV *data, STRLEN dataoffset, SV *callback)
235	{
236	aio_req req;
237	STRLEN svlen;
238	char *svptr = SvPV (data, svlen);
239
240	SvUPGRADE (data, SVt_PV);
241	SvPOK_on (data);
242
243	if (dataoffset < 0)
244	dataoffset += svlen;
245
246	if (dataoffset < 0 || dataoffset > svlen)
247	croak ("data offset outside of string");
248
249	if (dowrite)
250	{
251	/* write: check length and adjust. */
252	if (length < 0 || length + dataoffset > svlen)
253	length = svlen - dataoffset;
254	}
255	else
256	{
257	/* read: grow scalar as necessary */
258	svptr = SvGROW (data, length + dataoffset);
259	}
260
261	if (length < 0)
262	croak ("length must not be negative");
263
264	Newz (0, req, 1, aio_cb);	461	Newz (0, req, 1, eio_req); \
265		462	if (!req) \
266	if (!req)
267	croak ("out of memory during aio_req allocation");	463	croak ("out of memory during eio_req allocation"); \
268		464	\
269	req->type = dowrite ? REQ_WRITE : REQ_READ;
270	req->fd = fd;
271	req->offset = offset;
272	req->length = length;
273	req->data = SvREFCNT_inc (data);
274	req->dataptr = (char *)svptr + dataoffset;
275	req->callback = SvREFCNT_inc (callback);	465	req->callback = newSVsv (callback); \
		466	req->pri = req_pri
276		467
277	send_req (req);	468	#define REQ_SEND \
278	}	469	req_submit (req); \
		470	\
		471	if (GIMME_V != G_VOID) \
		472	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		473
		474	MODULE = IO::AIO PACKAGE = IO::AIO
279		475
280	static void *	476	PROTOTYPES: ENABLE
281	aio_proc (void *thr_arg)
282	{
283	aio_req req;
284	int type;
285		477
286	do	478	BOOT:
287	{	479	{
288	pthread_mutex_lock (&reqlock);	480	stash = gv_stashpv ("IO::AIO", 1);
289		481
290	for (;;)	482	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
291	{	483	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
292	req = reqs;	484	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
293		485	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
294	if (reqs)	486	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
295	{	487	#ifndef _WIN32
296	reqs = reqs->next;	488	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
297	if (!reqs) reqe = 0;
298	}
299
300	if (req)
301	break;
302
303	pthread_cond_wait (&reqwait, &reqlock);
304	}
305
306	pthread_mutex_unlock (&reqlock);
307
308	errno = 0; /* strictly unnecessary */
309
310	type = req->type;
311
312	switch (type)
313	{
314	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;
315	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;
316	#if SYS_readahead
317	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
318	#else
319	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
320	#endif	489	#endif
321		490
322	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	491	create_respipe ();
323	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
324	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
325		492
326	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	493	if (eio_init (want_poll, done_poll) < 0)
327	case REQ_CLOSE: req->result = close (req->fd); break;	494	croak ("IO::AIO: unable to initialise eio library");
328	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
329		495
330	case REQ_FSYNC: req->result = fsync (req->fd); break;	496	/* atfork child called in fifo order, so before eio's handler */
331	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	497	X_THREAD_ATFORK (0, 0, atfork_child);
332
333	case REQ_QUIT:
334	break;
335
336	default:
337	req->result = ENOSYS;
338	break;
339	}
340
341	req->errorno = errno;
342
343	pthread_mutex_lock (&reslock);
344
345	req->next = 0;
346
347	if (rese)
348	{
349	rese->next = req;
350	rese = req;
351	}
352	else
353	{
354	rese = ress = req;
355
356	/* write a dummy byte to the pipe so fh becomes ready */
357	write (respipe [1], &respipe, 1);
358	}
359
360	pthread_mutex_unlock (&reslock);
361	}
362	while (type != REQ_QUIT);
363
364	return 0;
365	}	498	}
366		499
367	MODULE = IO::AIO PACKAGE = IO::AIO
368
369	BOOT:
370	{
371	if (pipe (respipe))
372	croak ("unable to initialize result pipe");
373
374	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
375	croak ("cannot set result pipe to nonblocking mode");
376
377	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
378	croak ("cannot set result pipe to nonblocking mode");
379	}
380
381	void	500	void
382	min_parallel(nthreads)	501	max_poll_reqs (int nreqs)
383	int nthreads
384	PROTOTYPE: $	502	PROTOTYPE: $
385	CODE:	503	CODE:
386	while (nthreads > started)	504	eio_set_max_poll_reqs (nreqs);
387	start_thread ();
388		505
389	void	506	void
390	max_parallel(nthreads)	507	max_poll_time (double nseconds)
391	int nthreads
392	PROTOTYPE: $	508	PROTOTYPE: $
393	CODE:	509	CODE:
		510	eio_set_max_poll_time (nseconds);
		511
		512	void
		513	min_parallel (int nthreads)
		514	PROTOTYPE: $
		515	CODE:
		516	eio_set_min_parallel (nthreads);
		517
		518	void
		519	max_parallel (int nthreads)
		520	PROTOTYPE: $
		521	CODE:
		522	eio_set_max_parallel (nthreads);
		523
		524	void
		525	max_idle (int nthreads)
		526	PROTOTYPE: $
		527	CODE:
		528	eio_set_max_idle (nthreads);
		529
		530	void
		531	max_outstanding (int maxreqs)
		532	PROTOTYPE: $
		533	CODE:
		534	max_outstanding = maxreqs;
		535
		536	void
		537	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
		538	PROTOTYPE: $$$;$
		539	PPCODE:
394	{	540	{
395	int cur = started;	541	dREQ;
396	while (cur > nthreads)	542
397	{	543	req->type = EIO_OPEN;
398	end_thread ();	544	req->sv1 = newSVsv (pathname);
		545	req->ptr1 = SvPVbyte_nolen (req->sv1);
		546	req->int1 = flags;
		547	req->int2 = mode;
		548
		549	REQ_SEND;
		550	}
		551
		552	void
		553	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
		554	PROTOTYPE: $;$
		555	ALIAS:
		556	aio_fsync = EIO_FSYNC
		557	aio_fdatasync = EIO_FDATASYNC
		558	PPCODE:
		559	{
		560	dREQ;
		561
		562	req->type = ix;
		563	req->sv1 = newSVsv (fh);
		564	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		565
		566	REQ_SEND (req);
		567	}
		568
		569	void
		570	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		571	PROTOTYPE: $;$
		572	PPCODE:
		573	{
		574	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		575	dREQ;
		576
		577	if (close_pipe < 0)
		578	{
		579	int pipefd [2];
		580
		581	if (pipe (pipefd) < 0
		582	|| close (pipefd [1]) < 0
		583	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		584	abort (); /*D*/
		585
		586	close_pipe = pipefd [0];
		587	}
		588
		589	req->type = EIO_DUP2;
		590	req->int1 = close_pipe;
		591	req->sv2 = newSVsv (fh);
		592	req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		593
		594	REQ_SEND (req);
		595	}
		596
		597	void
		598	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
		599	ALIAS:
		600	aio_read = EIO_READ
		601	aio_write = EIO_WRITE
		602	PROTOTYPE: $$$$$;$
		603	PPCODE:
		604	{
		605	STRLEN svlen;
		606	char *svptr = SvPVbyte (data, svlen);
		607	UV len = SvUV (length);
		608
		609	SvUPGRADE (data, SVt_PV);
		610	SvPOK_on (data);
		611
		612	if (dataoffset < 0)
		613	dataoffset += svlen;
		614
		615	if (dataoffset < 0 || dataoffset > svlen)
		616	croak ("dataoffset outside of data scalar");
		617
		618	if (ix == EIO_WRITE)
		619	{
		620	/* write: check length and adjust. */
		621	if (!SvOK (length) || len + dataoffset > svlen)
		622	len = svlen - dataoffset;
		623	}
		624	else
		625	{
		626	/* read: grow scalar as necessary */
		627	svptr = SvGROW (data, len + dataoffset + 1);
		628	}
		629
		630	if (len < 0)
		631	croak ("length must not be negative");
		632
		633	{
		634	dREQ;
		635
		636	req->type = ix;
		637	req->sv1 = newSVsv (fh);
		638	req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
		639	: IoOFP (sv_2io (fh)));
		640	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		641	req->size = len;
		642	req->sv2 = SvREFCNT_inc (data);
		643	req->ptr2 = (char *)svptr + dataoffset;
		644	req->stroffset = dataoffset;
		645
		646	if (!SvREADONLY (data))
399	cur--;	647	{
		648	SvREADONLY_on (data);
		649	req->flags |= FLAG_SV2_RO_OFF;
400	}	650	}
401		651
402	while (started > nthreads)	652	REQ_SEND;
		653	}
		654	}
		655
		656	void
		657	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		658	PROTOTYPE: $$;$
		659	PPCODE:
		660	{
		661	SV *data;
		662	dREQ;
		663
		664	req->type = EIO_READLINK;
		665	req->sv1 = newSVsv (path);
		666	req->ptr1 = SvPVbyte_nolen (req->sv1);
		667
		668	REQ_SEND;
		669	}
		670
		671	void
		672	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		673	PROTOTYPE: $$$$;$
		674	PPCODE:
		675	{
		676	dREQ;
		677
		678	req->type = EIO_SENDFILE;
		679	req->sv1 = newSVsv (out_fh);
		680	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		681	req->sv2 = newSVsv (in_fh);
		682	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		683	req->offs = SvVAL64 (in_offset);
		684	req->size = length;
		685
		686	REQ_SEND;
		687	}
		688
		689	void
		690	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
		691	PROTOTYPE: $$$;$
		692	PPCODE:
		693	{
		694	dREQ;
		695
		696	req->type = EIO_READAHEAD;
		697	req->sv1 = newSVsv (fh);
		698	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		699	req->offs = SvVAL64 (offset);
		700	req->size = length;
		701
		702	REQ_SEND;
		703	}
		704
		705	void
		706	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
		707	ALIAS:
		708	aio_stat = EIO_STAT
		709	aio_lstat = EIO_LSTAT
		710	PPCODE:
		711	{
		712	dREQ;
		713
		714	req->sv1 = newSVsv (fh_or_path);
		715
		716	if (SvPOK (req->sv1))
		717	{
		718	req->type = ix;
		719	req->ptr1 = SvPVbyte_nolen (req->sv1);
		720	}
		721	else
		722	{
		723	req->type = EIO_FSTAT;
		724	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		725	}
		726
		727	REQ_SEND;
		728	}
		729
		730	void
		731	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		732	PPCODE:
		733	{
		734	dREQ;
		735
		736	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		737	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		738	req->sv1 = newSVsv (fh_or_path);
		739
		740	if (SvPOK (req->sv1))
		741	{
		742	req->type = EIO_UTIME;
		743	req->ptr1 = SvPVbyte_nolen (req->sv1);
		744	}
		745	else
		746	{
		747	req->type = EIO_FUTIME;
		748	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		749	}
		750
		751	REQ_SEND;
		752	}
		753
		754	void
		755	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		756	PPCODE:
		757	{
		758	dREQ;
		759
		760	req->sv1 = newSVsv (fh_or_path);
		761	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		762
		763	if (SvPOK (req->sv1))
		764	{
		765	req->type = EIO_TRUNCATE;
		766	req->ptr1 = SvPVbyte_nolen (req->sv1);
		767	}
		768	else
		769	{
		770	req->type = EIO_FTRUNCATE;
		771	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		772	}
		773
		774	REQ_SEND;
		775	}
		776
		777	void
		778	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		779	ALIAS:
		780	aio_chmod = EIO_CHMOD
		781	aio_mkdir = EIO_MKDIR
		782	PPCODE:
		783	{
		784	dREQ;
		785
		786	req->int2 = mode;
		787	req->sv1 = newSVsv (fh_or_path);
		788
		789	if (SvPOK (req->sv1))
		790	{
		791	req->type = ix;
		792	req->ptr1 = SvPVbyte_nolen (req->sv1);
		793	}
		794	else
		795	{
		796	req->type = EIO_FCHMOD;
		797	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		798	}
		799
		800	REQ_SEND;
		801	}
		802
		803	void
		804	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		805	PPCODE:
		806	{
		807	dREQ;
		808
		809	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		810	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		811	req->sv1 = newSVsv (fh_or_path);
		812
		813	if (SvPOK (req->sv1))
		814	{
		815	req->type = EIO_CHOWN;
		816	req->ptr1 = SvPVbyte_nolen (req->sv1);
		817	}
		818	else
		819	{
		820	req->type = EIO_FCHOWN;
		821	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		822	}
		823
		824	REQ_SEND;
		825	}
		826
		827	void
		828	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
		829	ALIAS:
		830	aio_unlink = EIO_UNLINK
		831	aio_rmdir = EIO_RMDIR
		832	aio_readdir = EIO_READDIR
		833	PPCODE:
		834	{
		835	dREQ;
		836
		837	req->type = ix;
		838	req->sv1 = newSVsv (pathname);
		839	req->ptr1 = SvPVbyte_nolen (req->sv1);
		840
		841	REQ_SEND;
		842	}
		843
		844	void
		845	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		846	ALIAS:
		847	aio_link = EIO_LINK
		848	aio_symlink = EIO_SYMLINK
		849	aio_rename = EIO_RENAME
		850	PPCODE:
		851	{
		852	dREQ;
		853
		854	req->type = ix;
		855	req->sv1 = newSVsv (oldpath);
		856	req->ptr1 = SvPVbyte_nolen (req->sv1);
		857	req->sv2 = newSVsv (newpath);
		858	req->ptr2 = SvPVbyte_nolen (req->sv2);
		859
		860	REQ_SEND;
		861	}
		862
		863	void
		864	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		865	PPCODE:
		866	{
		867	dREQ;
		868
		869	req->type = EIO_MKNOD;
		870	req->sv1 = newSVsv (pathname);
		871	req->ptr1 = SvPVbyte_nolen (req->sv1);
		872	req->int2 = (mode_t)mode;
		873	req->offs = dev;
		874
		875	REQ_SEND;
		876	}
		877
		878	void
		879	aio_busy (double delay, SV *callback=&PL_sv_undef)
		880	PPCODE:
		881	{
		882	dREQ;
		883
		884	req->type = EIO_BUSY;
		885	req->nv1 = delay < 0. ? 0. : delay;
		886
		887	REQ_SEND;
		888	}
		889
		890	void
		891	aio_group (SV *callback=&PL_sv_undef)
		892	PROTOTYPE: ;$
		893	PPCODE:
		894	{
		895	dREQ;
		896
		897	req->type = EIO_GROUP;
		898
		899	eio_submit (req);
		900	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		901	}
		902
		903	void
		904	aio_nop (SV *callback=&PL_sv_undef)
		905	ALIAS:
		906	aio_nop = EIO_NOP
		907	aio_sync = EIO_SYNC
		908	PPCODE:
		909	{
		910	dREQ;
		911
		912	req->type = ix;
		913
		914	REQ_SEND;
		915	}
		916
		917	int
		918	aioreq_pri (int pri = 0)
		919	PROTOTYPE: ;$
		920	CODE:
		921	RETVAL = next_pri;
		922	if (items > 0)
		923	{
		924	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		925	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		926	next_pri = pri;
		927	}
		928	OUTPUT:
		929	RETVAL
		930
		931	void
		932	aioreq_nice (int nice = 0)
		933	CODE:
		934	nice = next_pri - nice;
		935	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		936	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		937	next_pri = nice;
		938
		939	void
		940	flush ()
		941	PROTOTYPE:
		942	CODE:
		943	while (eio_nreqs ())
403	{	944	{
404	poll_wait ();	945	poll_wait ();
405	poll_cb (aTHX);	946	poll_cb ();
406	}	947	}
407	}
408		948
409	int	949	int
410	max_outstanding(nreqs)	950	poll()
411	int nreqs
412	PROTOTYPE: $
413	CODE:
414	RETVAL = max_outstanding;
415	max_outstanding = nreqs;
416
417	void
418	aio_open(pathname,flags,mode,callback)
419	SV * pathname
420	int flags
421	int mode
422	SV * callback
423	PROTOTYPE: $$$$
424	CODE:
425	{
426	aio_req req;
427
428	Newz (0, req, 1, aio_cb);
429
430	if (!req)
431	croak ("out of memory during aio_req allocation");
432
433	req->type = REQ_OPEN;
434	req->data = newSVsv (pathname);
435	req->dataptr = SvPV_nolen (req->data);
436	req->fd = flags;
437	req->mode = mode;
438	req->callback = SvREFCNT_inc (callback);
439
440	send_req (req);
441	}
442
443	void
444	aio_close(fh,callback)
445	InputStream fh
446	SV * callback
447	PROTOTYPE: $$	951	PROTOTYPE:
448	ALIAS:
449	aio_close = REQ_CLOSE
450	aio_fsync = REQ_FSYNC
451	aio_fdatasync = REQ_FDATASYNC
452	CODE:	952	CODE:
453	{	953	poll_wait ();
454	aio_req req;	954	RETVAL = poll_cb ();
455		955	OUTPUT:
456	Newz (0, req, 1, aio_cb);	956	RETVAL
457
458	if (!req)
459	croak ("out of memory during aio_req allocation");
460
461	req->type = ix;
462	req->fd = PerlIO_fileno (fh);
463	req->callback = SvREFCNT_inc (callback);
464
465	send_req (req);
466	}
467
468	void
469	aio_read(fh,offset,length,data,dataoffset,callback)
470	InputStream fh
471	UV offset
472	IV length
473	SV * data
474	IV dataoffset
475	SV * callback
476	PROTOTYPE: $$$$$$
477	CODE:
478	read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
479
480	void
481	aio_write(fh,offset,length,data,dataoffset,callback)
482	OutputStream fh
483	UV offset
484	IV length
485	SV * data
486	IV dataoffset
487	SV * callback
488	PROTOTYPE: $$$$$$
489	CODE:
490	read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
491
492	void
493	aio_readahead(fh,offset,length,callback)
494	InputStream fh
495	UV offset
496	IV length
497	SV * callback
498	PROTOTYPE: $$$$
499	CODE:
500	{
501	aio_req req;
502
503	if (length < 0)
504	croak ("length must not be negative");
505
506	Newz (0, req, 1, aio_cb);
507
508	if (!req)
509	croak ("out of memory during aio_req allocation");
510
511	req->type = REQ_READAHEAD;
512	req->fd = PerlIO_fileno (fh);
513	req->offset = offset;
514	req->length = length;
515	req->callback = SvREFCNT_inc (callback);
516
517	send_req (req);
518	}
519
520	void
521	aio_stat(fh_or_path,callback)
522	SV * fh_or_path
523	SV * callback
524	PROTOTYPE: $$
525	ALIAS:
526	aio_lstat = 1
527	CODE:
528	{
529	aio_req req;
530
531	Newz (0, req, 1, aio_cb);
532
533	if (!req)
534	croak ("out of memory during aio_req allocation");
535
536	New (0, req->statdata, 1, Stat_t);
537
538	if (!req->statdata)
539	croak ("out of memory during aio_req->statdata allocation");
540
541	if (SvPOK (fh_or_path))
542	{
543	req->type = ix ? REQ_LSTAT : REQ_STAT;
544	req->data = newSVsv (fh_or_path);
545	req->dataptr = SvPV_nolen (req->data);
546	}
547	else
548	{
549	req->type = REQ_FSTAT;
550	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
551	}
552
553	req->callback = SvREFCNT_inc (callback);
554
555	send_req (req);
556	}
557
558	void
559	aio_unlink(pathname,callback)
560	SV * pathname
561	SV * callback
562	PROTOTYPE: $$
563	CODE:
564	{
565	aio_req req;
566
567	Newz (0, req, 1, aio_cb);
568
569	if (!req)
570	croak ("out of memory during aio_req allocation");
571
572	req->type = REQ_UNLINK;
573	req->data = newSVsv (pathname);
574	req->dataptr = SvPV_nolen (req->data);
575	req->callback = SvREFCNT_inc (callback);
576
577	send_req (req);
578	}
579		957
580	int	958	int
581	poll_fileno()	959	poll_fileno()
582	PROTOTYPE:	960	PROTOTYPE:
583	CODE:	961	CODE:
…		…
587		965
588	int	966	int
589	poll_cb(...)	967	poll_cb(...)
590	PROTOTYPE:	968	PROTOTYPE:
591	CODE:	969	CODE:
592	RETVAL = poll_cb (aTHX);	970	RETVAL = poll_cb ();
593	OUTPUT:	971	OUTPUT:
594	RETVAL	972	RETVAL
595		973
596	void	974	void
597	poll_wait()	975	poll_wait()
598	PROTOTYPE:	976	PROTOTYPE:
599	CODE:	977	CODE:
600	if (nreqs)
601	poll_wait ();	978	poll_wait ();
602		979
603	int	980	int
604	nreqs()	981	nreqs()
605	PROTOTYPE:	982	PROTOTYPE:
606	CODE:	983	CODE:
607	RETVAL = nreqs;	984	RETVAL = eio_nreqs ();
608	OUTPUT:	985	OUTPUT:
609	RETVAL	986	RETVAL
610		987
		988	int
		989	nready()
		990	PROTOTYPE:
		991	CODE:
		992	RETVAL = eio_nready ();
		993	OUTPUT:
		994	RETVAL
		995
		996	int
		997	npending()
		998	PROTOTYPE:
		999	CODE:
		1000	RETVAL = eio_npending ();
		1001	OUTPUT:
		1002	RETVAL
		1003
		1004	int
		1005	nthreads()
		1006	PROTOTYPE:
		1007	CODE:
		1008	RETVAL = eio_nthreads ();
		1009	OUTPUT:
		1010	RETVAL
		1011
		1012	void _on_next_submit (SV *cb)
		1013	CODE:
		1014	SvREFCNT_dec (on_next_submit);
		1015	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1016
		1017	PROTOTYPES: DISABLE
		1018
		1019	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1020
		1021	void
		1022	cancel (aio_req_ornot req)
		1023	CODE:
		1024	eio_cancel (req);
		1025
		1026	void
		1027	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1028	CODE:
		1029	SvREFCNT_dec (req->callback);
		1030	req->callback = newSVsv (callback);
		1031
		1032	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1033
		1034	void
		1035	add (aio_req grp, ...)
		1036	PPCODE:
		1037	{
		1038	int i;
		1039
		1040	if (grp->int1 == 2)
		1041	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1042
		1043	for (i = 1; i < items; ++i )
		1044	{
		1045	aio_req req;
		1046
		1047	if (GIMME_V != G_VOID)
		1048	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1049
		1050	req = SvAIO_REQ (ST (i));
		1051
		1052	if (req)
		1053	eio_grp_add (grp, req);
		1054	}
		1055	}
		1056
		1057	void
		1058	cancel_subs (aio_req_ornot req)
		1059	CODE:
		1060	req_cancel_subs (req);
		1061
		1062	void
		1063	result (aio_req grp, ...)
		1064	CODE:
		1065	{
		1066	int i;
		1067	AV *av;
		1068
		1069	grp->errorno = errno;
		1070
		1071	av = newAV ();
		1072
		1073	for (i = 1; i < items; ++i )
		1074	av_push (av, newSVsv (ST (i)));
		1075
		1076	SvREFCNT_dec (grp->sv1);
		1077	grp->sv1 = (SV *)av;
		1078	}
		1079
		1080	void
		1081	errno (aio_req grp, int errorno = errno)
		1082	CODE:
		1083	grp->errorno = errorno;
		1084
		1085	void
		1086	limit (aio_req grp, int limit)
		1087	CODE:
		1088	eio_grp_limit (grp, limit);
		1089
		1090	void
		1091	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1092	CODE:
		1093	{
		1094	SvREFCNT_dec (grp->sv2);
		1095	grp->sv2 = newSVsv (callback);
		1096
		1097	if (grp->int2 <= 0)
		1098	grp->int2 = 2;
		1099
		1100	eio_grp_limit (grp, grp->int2);
		1101	}
		1102

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