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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.48 by root, Sun Oct 22 10:33:19 2006 UTC vs.
Revision 1.86 by root, Mon Oct 30 23:30:00 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
…		…
34	# else	43	# else
35	# error sendfile support requested but not available	44	# error sendfile support requested but not available
36	# endif	45	# endif
37	#endif	46	#endif
38		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
39	/* used for struct dirent, AIX doesn't provide it */	51	/* used for struct dirent, AIX doesn't provide it */
40	#ifndef NAME_MAX	52	#ifndef NAME_MAX
41	# define NAME_MAX 4096	53	# define NAME_MAX 4096
42	#endif	54	#endif
43		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
44	#if __ia64	61	#if __ia64
45	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
46	#else	65	#else
47	# define STACKSIZE 8192	66	# define STACKSIZE 16384
48	#endif	67	#endif
		68
		69	/* wether word reads are potentially non-atomic.
		70	* this is conservatice, likely most arches this runs
		71	* on have atomic word read/writes.
		72	*/
		73	#ifndef WORDACCESS_UNSAFE
		74	# if __i386 || __x86_64
		75	# define WORDACCESS_UNSAFE 0
		76	# else
		77	# define WORDACCESS_UNSAFE 1
		78	# endif
		79	#endif
		80
		81	/* buffer size for various temporary buffers */
		82	#define AIO_BUFSIZE 65536
		83
		84	#define dBUF \
		85	char *aio_buf; \
		86	LOCK (wrklock); \
		87	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		88	UNLOCK (wrklock); \
		89	if (!aio_buf) \
		90	return -1;
49		91
50	enum {	92	enum {
51	REQ_QUIT,	93	REQ_QUIT,
52	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
53	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
54	REQ_SENDFILE,	96	REQ_SENDFILE,
55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
56	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
57	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
58	REQ_READDIR,	100	REQ_MKNOD, REQ_READDIR,
59	REQ_LINK, REQ_SYMLINK,	101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
60	REQ_SLEEP,	102	REQ_GROUP, REQ_NOP,
61	REQ_GROUP,	103	REQ_BUSY,
62	};	104	};
63		105
64	#define AIO_REQ_KLASS "IO::AIO::REQ"	106	#define AIO_REQ_KLASS "IO::AIO::REQ"
65	#define AIO_GRP_KLASS "IO::AIO::GRP"	107	#define AIO_GRP_KLASS "IO::AIO::GRP"
66		108
67	typedef struct aio_cb	109	typedef struct aio_cb
68	{	110	{
69	struct aio_cb *grp, *grp_prev, *grp_next;
70
71	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
72		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	Stat_t *statdata;
		117	off_t offs;
		118	size_t size;
		119	ssize_t result;
		120
		121	STRLEN stroffset;
		122	int type;
		123	int int1, int2;
		124	int errorno;
		125	mode_t mode; /* open */
		126
		127	unsigned char flags;
		128	unsigned char pri;
		129
73	SV *self; /* the perl counterpart of this request, if any */	130	SV *self; /* the perl counterpart of this request, if any */
74		131	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
75	SV *data, *callback;
76	SV *fh, *fh2;
77	void *dataptr, *data2ptr;
78	Stat_t *statdata;
79	off_t offset;
80	size_t length;
81	ssize_t result;
82
83	int type;
84	int fd, fd2;
85	int errorno;
86	STRLEN dataoffset;
87	mode_t mode; /* open */
88	unsigned char cancelled;
89	} aio_cb;	132	} aio_cb;
		133
		134	enum {
		135	FLAG_CANCELLED = 0x01,
		136	FLAG_DATA_RO_OFF = 0x80, /* data was set readonly */
		137	};
90		138
91	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
92	typedef aio_cb *aio_req_ornot;	140	typedef aio_cb *aio_req_ornot;
93		141
		142	enum {
		143	PRI_MIN = -4,
		144	PRI_MAX = 4,
		145
		146	DEFAULT_PRI = 0,
		147	PRI_BIAS = -PRI_MIN,
		148	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		149	};
		150
		151	#define AIO_TICKS ((1000000 + 1023) >> 10)
		152
		153	static unsigned int max_poll_time = 0;
		154	static unsigned int max_poll_reqs = 0;
		155
		156	/* calculcate time difference in ~1/AIO_TICKS of a second */
		157	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		158	{
		159	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		160	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		161	}
		162
		163	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		164
94	static int started, wanted;	165	static unsigned int started, idle, wanted;
95	static volatile int nreqs;	166
96	static int max_outstanding = 1<<30;	167	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		168	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		169	#else
		170	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		171	#endif
		172
		173	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		174	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		175
		176	/* worker threads management */
		177	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		178
		179	typedef struct worker {
		180	/* locked by wrklock */
		181	struct worker *prev, *next;
		182
		183	pthread_t tid;
		184
		185	/* locked by reslock, reqlock or wrklock */
		186	aio_req req; /* currently processed request */
		187	void *dbuf;
		188	DIR *dirp;
		189	} worker;
		190
		191	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		192
		193	static void worker_clear (worker *wrk)
		194	{
		195	if (wrk->dirp)
		196	{
		197	closedir (wrk->dirp);
		198	wrk->dirp = 0;
		199	}
		200
		201	if (wrk->dbuf)
		202	{
		203	free (wrk->dbuf);
		204	wrk->dbuf = 0;
		205	}
		206	}
		207
		208	static void worker_free (worker *wrk)
		209	{
		210	wrk->next->prev = wrk->prev;
		211	wrk->prev->next = wrk->next;
		212
		213	free (wrk);
		214	}
		215
		216	static volatile unsigned int nreqs, nready, npending;
		217	static volatile unsigned int max_idle = 4;
		218	static volatile unsigned int max_outstanding = 0xffffffff;
97	static int respipe [2];	219	static int respipe [2];
98		220
99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
102		224
103	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
104	static volatile aio_req ress, rese; /* queue start, queue end */
105		226
		227	static unsigned int get_nready ()
		228	{
		229	unsigned int retval;
		230
		231	LOCK (reqlock);
		232	retval = nready;
		233	UNLOCK (reqlock);
		234
		235	return retval;
		236	}
		237
		238	static unsigned int get_npending ()
		239	{
		240	unsigned int retval;
		241
		242	LOCK (reslock);
		243	retval = npending;
		244	UNLOCK (reslock);
		245
		246	return retval;
		247	}
		248
		249	static unsigned int get_nthreads ()
		250	{
		251	unsigned int retval;
		252
		253	LOCK (wrklock);
		254	retval = started;
		255	UNLOCK (wrklock);
		256
		257	return retval;
		258	}
		259
		260	#else
		261
		262	# define get_nready() nready
		263	# define get_npending() npending
		264	# define get_nthreads() started
		265
		266	#endif
		267
		268	/*
		269	* a somewhat faster data structure might be nice, but
		270	* with 8 priorities this actually needs <20 insns
		271	* per shift, the most expensive operation.
		272	*/
		273	typedef struct {
		274	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		275	int size;
		276	} reqq;
		277
		278	static reqq req_queue;
		279	static reqq res_queue;
		280
		281	int reqq_push (reqq *q, aio_req req)
		282	{
		283	int pri = req->pri;
		284	req->next = 0;
		285
		286	if (q->qe[pri])
		287	{
		288	q->qe[pri]->next = req;
		289	q->qe[pri] = req;
		290	}
		291	else
		292	q->qe[pri] = q->qs[pri] = req;
		293
		294	return q->size++;
		295	}
		296
		297	aio_req reqq_shift (reqq *q)
		298	{
		299	int pri;
		300
		301	if (!q->size)
		302	return 0;
		303
		304	--q->size;
		305
		306	for (pri = NUM_PRI; pri--; )
		307	{
		308	aio_req req = q->qs[pri];
		309
		310	if (req)
		311	{
		312	if (!(q->qs[pri] = req->next))
		313	q->qe[pri] = 0;
		314
		315	return req;
		316	}
		317	}
		318
		319	abort ();
		320	}
		321
		322	static int poll_cb ();
		323	static void req_invoke (aio_req req);
106	static void req_free (aio_req req);	324	static void req_free (aio_req req);
		325	static void req_cancel (aio_req req);
107		326
108	/* must be called at most once */	327	/* must be called at most once */
109	static SV *req_sv (aio_req req, const char *klass)	328	static SV *req_sv (aio_req req, const char *klass)
110	{	329	{
		330	if (!req->self)
		331	{
111	req->self = (SV *)newHV ();	332	req->self = (SV *)newHV ();
112	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
113		335
114	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));	336	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
115	}	337	}
116		338
117	static aio_req SvAIO_REQ (SV *sv)	339	static aio_req SvAIO_REQ (SV *sv)
118	{	340	{
		341	MAGIC *mg;
		342
119	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))	343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
120	croak ("object of class " AIO_REQ_KLASS " expected");	344	croak ("object of class " AIO_REQ_KLASS " expected");
121		345
122	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
123		347
124	return mg ? (aio_req)mg->mg_ptr : 0;	348	return mg ? (aio_req)mg->mg_ptr : 0;
125	}	349	}
126		350
127	static void poll_wait ()	351	static void aio_grp_feed (aio_req grp)
128	{	352	{
129	if (nreqs && !ress)	353	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		354	{
		355	int old_len = grp->size;
		356
		357	if (grp->sv2 && SvOK (grp->sv2))
		358	{
		359	dSP;
		360
		361	ENTER;
		362	SAVETMPS;
		363	PUSHMARK (SP);
		364	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		365	PUTBACK;
		366	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		367	SPAGAIN;
		368	FREETMPS;
		369	LEAVE;
		370	}
		371
		372	/* stop if no progress has been made */
		373	if (old_len == grp->size)
		374	{
		375	SvREFCNT_dec (grp->sv2);
		376	grp->sv2 = 0;
		377	break;
		378	}
130	{	379	}
131	fd_set rfd;	380	}
132	FD_ZERO(&rfd);
133	FD_SET(respipe [0], &rfd);
134		381
135	select (respipe [0] + 1, &rfd, 0, 0, 0);	382	static void aio_grp_dec (aio_req grp)
		383	{
		384	--grp->size;
		385
		386	/* call feeder, if applicable */
		387	aio_grp_feed (grp);
		388
		389	/* finish, if done */
		390	if (!grp->size && grp->int1)
		391	{
		392	req_invoke (grp);
		393	req_free (grp);
136	}	394	}
137	}	395	}
138		396
139	static void req_invoke (aio_req req)	397	static void req_invoke (aio_req req)
140	{	398	{
141	dSP;	399	dSP;
142	int errorno = errno;
143		400
144	if (req->cancelled || !SvOK (req->callback))	401	if (req->flags & FLAG_DATA_RO_OFF)
145	return;	402	SvREADONLY_off (req->sv1);
146		403
147	errno = req->errorno;	404	if (req->statdata)
		405	{
		406	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		407	PL_laststatval = req->result;
		408	PL_statcache = *(req->statdata);
		409	}
148		410
		411	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		412	{
149	ENTER;	413	ENTER;
		414	SAVETMPS;
150	PUSHMARK (SP);	415	PUSHMARK (SP);
151	EXTEND (SP, 1);	416	EXTEND (SP, 1);
152		417
153	switch (req->type)	418	switch (req->type)
154	{
155	case REQ_READDIR:
156	{	419	{
157	SV *rv = &PL_sv_undef;	420	case REQ_READDIR:
158
159	if (req->result >= 0)
160	{	421	{
161	char *buf = req->data2ptr;	422	SV *rv = &PL_sv_undef;
162	AV *av = newAV ();
163		423
164	while (req->result)	424	if (req->result >= 0)
165	{	425	{
		426	int i;
		427	char *buf = req->ptr2;
		428	AV *av = newAV ();
		429
		430	av_extend (av, req->result - 1);
		431
		432	for (i = 0; i < req->result; ++i)
		433	{
166	SV *sv = newSVpv (buf, 0);	434	SV *sv = newSVpv (buf, 0);
167		435
168	av_push (av, sv);	436	av_store (av, i, sv);
169	buf += SvCUR (sv) + 1;	437	buf += SvCUR (sv) + 1;
170	req->result--;	438	}
		439
		440	rv = sv_2mortal (newRV_noinc ((SV *)av));
171	}	441	}
172		442
173	rv = sv_2mortal (newRV_noinc ((SV *)av));	443	PUSHs (rv);
174	}	444	}
		445	break;
175		446
		447	case REQ_OPEN:
		448	{
		449	/* convert fd to fh */
		450	SV *fh;
		451
		452	PUSHs (sv_2mortal (newSViv (req->result)));
		453	PUTBACK;
		454	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		455	SPAGAIN;
		456
		457	fh = SvREFCNT_inc (POPs);
		458
		459	PUSHMARK (SP);
		460	XPUSHs (sv_2mortal (fh));
		461	}
		462	break;
		463
		464	case REQ_GROUP:
		465	req->int1 = 2; /* mark group as finished */
		466
		467	if (req->sv1)
		468	{
		469	int i;
		470	AV *av = (AV *)req->sv1;
		471
		472	EXTEND (SP, AvFILL (av) + 1);
		473	for (i = 0; i <= AvFILL (av); ++i)
		474	PUSHs (*av_fetch (av, i, 0));
		475	}
		476	break;
		477
		478	case REQ_NOP:
		479	case REQ_BUSY:
		480	break;
		481
		482	case REQ_READLINK:
		483	if (req->result > 0)
		484	{
		485	SvCUR_set (req->sv1, req->result);
		486	*SvEND (req->sv1) = 0;
176	PUSHs (rv);	487	PUSHs (req->sv1);
		488	}
		489	break;
		490
		491	case REQ_READ:
		492	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		493	*SvEND (req->sv1) = 0;
		494	/* fall through */
		495	default:
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
177	}	498	}
178	break;
179		499
180	case REQ_OPEN:	500	errno = req->errorno;
181	{
182	/* convert fd to fh */
183	SV *fh;
184		501
185	PUSHs (sv_2mortal (newSViv (req->result)));
186	PUTBACK;	502	PUTBACK;
187	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
188	SPAGAIN;
189
190	fh = SvREFCNT_inc (POPs);
191
192	PUSHMARK (SP);
193	XPUSHs (sv_2mortal (fh));
194	}
195	break;
196
197	case REQ_GROUP:
198	if (req->data)
199	{
200	int i;
201	AV *av = (AV *)req->data;
202
203	EXTEND (SP, AvFILL (av) + 1);
204	for (i = 0; i <= AvFILL (av); ++i)
205	PUSHs (*av_fetch (av, i, 0));
206	}
207	break;
208
209	case REQ_SLEEP:
210	break;
211
212	default:
213	PUSHs (sv_2mortal (newSViv (req->result)));
214	break;
215	}
216
217
218	PUTBACK;
219	call_sv (req->callback, G_VOID | G_EVAL);	503	call_sv (req->callback, G_VOID | G_EVAL);
220	SPAGAIN;	504	SPAGAIN;
		505
		506	FREETMPS;
		507	LEAVE;
		508	}
		509
		510	if (req->grp)
		511	{
		512	aio_req grp = req->grp;
		513
		514	/* unlink request */
		515	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		516	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		517
		518	if (grp->grp_first == req)
		519	grp->grp_first = req->grp_next;
		520
		521	aio_grp_dec (grp);
		522	}
221		523
222	if (SvTRUE (ERRSV))	524	if (SvTRUE (ERRSV))
223	{	525	{
224	req_free (req);	526	req_free (req);
225	croak (0);	527	croak (0);
226	}	528	}
227
228	LEAVE;
229
230	errno = errorno;
231	}	529	}
232		530
233	static void req_free (aio_req req)	531	static void req_free (aio_req req)
234	{	532	{
235	if (req->grp)
236	{
237	aio_req grp = req->grp;
238
239	/* unlink request */
240	req->grp_next->grp_prev = req->grp_prev;
241	req->grp_prev->grp_next = req->grp_next;
242
243	if (grp->grp_next == grp && grp->fd)
244	{
245	req_invoke (grp);
246	req_free (grp);
247	}
248	}
249
250	if (req->self)	533	if (req->self)
251	{	534	{
252	sv_unmagic (req->self, PERL_MAGIC_ext);	535	sv_unmagic (req->self, PERL_MAGIC_ext);
253	SvREFCNT_dec (req->self);	536	SvREFCNT_dec (req->self);
254	}	537	}
255		538
256	if (req->data)
257	SvREFCNT_dec (req->data);
258
259	if (req->fh)
260	SvREFCNT_dec (req->fh);	539	SvREFCNT_dec (req->fh);
261		540	SvREFCNT_dec (req->sv1);
262	if (req->fh2)
263	SvREFCNT_dec (req->fh2);	541	SvREFCNT_dec (req->sv2);
264
265	if (req->statdata)
266	Safefree (req->statdata);
267
268	if (req->callback)
269	SvREFCNT_dec (req->callback);	542	SvREFCNT_dec (req->callback);
		543	Safefree (req->statdata);
270		544
271	if (req->type == REQ_READDIR && req->result >= 0)	545	if (req->type == REQ_READDIR)
272	free (req->data2ptr);	546	free (req->ptr2);
273		547
274	Safefree (req);	548	Safefree (req);
275	}	549	}
276		550
		551	static void req_cancel_subs (aio_req grp)
		552	{
		553	aio_req sub;
		554
		555	if (grp->type != REQ_GROUP)
		556	return;
		557
		558	SvREFCNT_dec (grp->sv2);
		559	grp->sv2 = 0;
		560
		561	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		562	req_cancel (sub);
		563	}
		564
277	static void req_cancel (aio_req req)	565	static void req_cancel (aio_req req)
278	{	566	{
279	req->cancelled = 1;	567	req->flags |= FLAG_CANCELLED;
280		568
281	if (req->type == REQ_GROUP)	569	req_cancel_subs (req);
282	{
283	aio_req sub;
284
285	for (sub = req->grp_next; sub != req; sub = sub->grp_next)
286	req_cancel (sub);
287	}
288	}
289
290	static int poll_cb ()
291	{
292	dSP;
293	int count = 0;
294	int do_croak = 0;
295	aio_req req;
296
297	for (;;)
298	{
299	pthread_mutex_lock (&reslock);
300	req = ress;
301
302	if (req)
303	{
304	ress = req->next;
305
306	if (!ress)
307	{
308	/* read any signals sent by the worker threads */
309	char buf [32];
310	while (read (respipe [0], buf, 32) == 32)
311	;
312
313	rese = 0;
314	}
315	}
316
317	pthread_mutex_unlock (&reslock);
318
319	if (!req)
320	break;
321
322	nreqs--;
323
324	if (req->type == REQ_QUIT)
325	started--;
326	else if (req->type == REQ_GROUP && req->grp_next != req)
327	{
328	req->fd = 1; /* mark request as delayed */
329	continue;
330	}
331	else
332	{
333	if (req->type == REQ_READ)
334	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
335
336	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
337	SvREADONLY_off (req->data);
338
339	if (req->statdata)
340	{
341	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
342	PL_laststatval = req->result;
343	PL_statcache = *(req->statdata);
344	}
345
346	req_invoke (req);
347
348	count++;
349	}
350
351	req_free (req);
352	}
353
354	return count;
355	}	570	}
356		571
357	static void *aio_proc(void *arg);	572	static void *aio_proc(void *arg);
358		573
359	static void start_thread (void)	574	static void start_thread (void)
360	{	575	{
361	sigset_t fullsigset, oldsigset;	576	sigset_t fullsigset, oldsigset;
362	pthread_t tid;
363	pthread_attr_t attr;	577	pthread_attr_t attr;
		578
		579	worker *wrk = calloc (1, sizeof (worker));
		580
		581	if (!wrk)
		582	croak ("unable to allocate worker thread data");
364		583
365	pthread_attr_init (&attr);	584	pthread_attr_init (&attr);
366	pthread_attr_setstacksize (&attr, STACKSIZE);	585	pthread_attr_setstacksize (&attr, STACKSIZE);
367	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	586	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		587	#ifdef PTHREAD_SCOPE_PROCESS
		588	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		589	#endif
368		590
369	sigfillset (&fullsigset);	591	sigfillset (&fullsigset);
		592
		593	LOCK (wrklock);
370	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	594	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
371		595
372	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	596	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		597	{
		598	wrk->prev = &wrk_first;
		599	wrk->next = wrk_first.next;
		600	wrk_first.next->prev = wrk;
		601	wrk_first.next = wrk;
373	started++;	602	++started;
		603	}
		604	else
		605	free (wrk);
374		606
375	sigprocmask (SIG_SETMASK, &oldsigset, 0);	607	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		608	UNLOCK (wrklock);
		609	}
		610
		611	static void maybe_start_thread ()
		612	{
		613	if (get_nthreads () >= wanted)
		614	return;
		615
		616	/* todo: maybe use idle here, but might be less exact */
		617	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		618	return;
		619
		620	start_thread ();
376	}	621	}
377		622
378	static void req_send (aio_req req)	623	static void req_send (aio_req req)
379	{	624	{
380	while (started < wanted && nreqs >= started)
381	start_thread ();
382
383	nreqs++;	625	++nreqs;
384		626
385	pthread_mutex_lock (&reqlock);	627	LOCK (reqlock);
386		628	++nready;
387	req->next = 0;	629	reqq_push (&req_queue, req);
388
389	if (reqe)
390	{
391	reqe->next = req;
392	reqe = req;
393	}
394	else
395	reqe = reqs = req;
396
397	pthread_cond_signal (&reqwait);	630	pthread_cond_signal (&reqwait);
398	pthread_mutex_unlock (&reqlock);	631	UNLOCK (reqlock);
399		632
400	if (nreqs > max_outstanding)	633	maybe_start_thread ();
401	for (;;)
402	{
403	poll_cb ();
404
405	if (nreqs <= max_outstanding)
406	break;
407
408	poll_wait ();
409	}
410	}	634	}
411		635
412	static void end_thread (void)	636	static void end_thread (void)
413	{	637	{
414	aio_req req;	638	aio_req req;
		639
415	Newz (0, req, 1, aio_cb);	640	Newz (0, req, 1, aio_cb);
		641
416	req->type = REQ_QUIT;	642	req->type = REQ_QUIT;
		643	req->pri = PRI_MAX + PRI_BIAS;
417		644
418	req_send (req);	645	LOCK (reqlock);
		646	reqq_push (&req_queue, req);
		647	pthread_cond_signal (&reqwait);
		648	UNLOCK (reqlock);
		649
		650	LOCK (wrklock);
		651	--started;
		652	UNLOCK (wrklock);
		653	}
		654
		655	static void set_max_idle (int nthreads)
		656	{
		657	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		658	max_idle = nthreads <= 0 ? 1 : nthreads;
		659	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
419	}	660	}
420		661
421	static void min_parallel (int nthreads)	662	static void min_parallel (int nthreads)
422	{	663	{
423	if (wanted < nthreads)	664	if (wanted < nthreads)
424	wanted = nthreads;	665	wanted = nthreads;
425	}	666	}
426		667
427	static void max_parallel (int nthreads)	668	static void max_parallel (int nthreads)
428	{	669	{
429	int cur = started;
430
431	if (wanted > nthreads)	670	if (wanted > nthreads)
432	wanted = nthreads;	671	wanted = nthreads;
433		672
434	while (cur > wanted)
435	{
436	end_thread ();
437	cur--;
438	}
439
440	while (started > wanted)	673	while (started > wanted)
		674	end_thread ();
		675	}
		676
		677	static void poll_wait ()
		678	{
		679	fd_set rfd;
		680
		681	while (nreqs)
		682	{
		683	int size;
		684	if (WORDACCESS_UNSAFE) LOCK (reslock);
		685	size = res_queue.size;
		686	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		687
		688	if (size)
		689	return;
		690
		691	maybe_start_thread ();
		692
		693	FD_ZERO(&rfd);
		694	FD_SET(respipe [0], &rfd);
		695
		696	select (respipe [0] + 1, &rfd, 0, 0, 0);
441	{	697	}
		698	}
		699
		700	static int poll_cb ()
		701	{
		702	dSP;
		703	int count = 0;
		704	int maxreqs = max_poll_reqs;
		705	int do_croak = 0;
		706	struct timeval tv_start, tv_now;
		707	aio_req req;
		708
		709	if (max_poll_time)
		710	gettimeofday (&tv_start, 0);
		711
		712	for (;;)
		713	{
		714	for (;;)
		715	{
		716	maybe_start_thread ();
		717
		718	LOCK (reslock);
		719	req = reqq_shift (&res_queue);
		720
		721	if (req)
		722	{
		723	--npending;
		724
		725	if (!res_queue.size)
		726	{
		727	/* read any signals sent by the worker threads */
		728	char buf [32];
		729	while (read (respipe [0], buf, 32) == 32)
		730	;
		731	}
		732	}
		733
		734	UNLOCK (reslock);
		735
		736	if (!req)
		737	break;
		738
		739	--nreqs;
		740
		741	if (req->type == REQ_GROUP && req->size)
		742	{
		743	req->int1 = 1; /* mark request as delayed */
		744	continue;
		745	}
		746	else
		747	{
		748	req_invoke (req);
		749
		750	count++;
		751	}
		752
		753	req_free (req);
		754
		755	if (maxreqs && !--maxreqs)
		756	break;
		757
		758	if (max_poll_time)
		759	{
		760	gettimeofday (&tv_now, 0);
		761
		762	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		763	break;
		764	}
		765	}
		766
		767	if (nreqs <= max_outstanding)
		768	break;
		769
442	poll_wait ();	770	poll_wait ();
443	poll_cb ();	771
		772	++maxreqs;
444	}	773	}
		774
		775	return count;
445	}	776	}
446		777
447	static void create_pipe ()	778	static void create_pipe ()
448	{	779	{
449	if (pipe (respipe))	780	if (pipe (respipe))
…		…
473	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)	804	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
474	{	805	{
475	ssize_t res;	806	ssize_t res;
476	off_t ooffset;	807	off_t ooffset;
477		808
478	pthread_mutex_lock (&preadwritelock);	809	LOCK (preadwritelock);
479	ooffset = lseek (fd, 0, SEEK_CUR);	810	ooffset = lseek (fd, 0, SEEK_CUR);
480	lseek (fd, offset, SEEK_SET);	811	lseek (fd, offset, SEEK_SET);
481	res = read (fd, buf, count);	812	res = read (fd, buf, count);
482	lseek (fd, ooffset, SEEK_SET);	813	lseek (fd, ooffset, SEEK_SET);
483	pthread_mutex_unlock (&preadwritelock);	814	UNLOCK (preadwritelock);
484		815
485	return res;	816	return res;
486	}	817	}
487		818
488	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)	819	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
489	{	820	{
490	ssize_t res;	821	ssize_t res;
491	off_t ooffset;	822	off_t ooffset;
492		823
493	pthread_mutex_lock (&preadwritelock);	824	LOCK (preadwritelock);
494	ooffset = lseek (fd, 0, SEEK_CUR);	825	ooffset = lseek (fd, 0, SEEK_CUR);
495	lseek (fd, offset, SEEK_SET);	826	lseek (fd, offset, SEEK_SET);
496	res = write (fd, buf, count);	827	res = write (fd, buf, count);
497	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
498	pthread_mutex_unlock (&preadwritelock);	829	UNLOCK (preadwritelock);
499		830
500	return res;	831	return res;
501	}	832	}
502	#endif	833	#endif
503		834
504	#if !HAVE_FDATASYNC	835	#if !HAVE_FDATASYNC
505	# define fdatasync fsync	836	# define fdatasync fsync
506	#endif	837	#endif
507		838
508	#if !HAVE_READAHEAD	839	#if !HAVE_READAHEAD
509	# define readahead aio_readahead	840	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
510		841
511	static ssize_t readahead (int fd, off_t offset, size_t count)	842	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
512	{	843	{
513	char readahead_buf[4096];	844	dBUF;
514		845
515	while (count > 0)	846	while (count > 0)
516	{	847	{
517	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	848	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
518		849
519	pread (fd, readahead_buf, len, offset);	850	pread (fd, aio_buf, len, offset);
520	offset += len;	851	offset += len;
521	count -= len;	852	count -= len;
522	}	853	}
523		854
524	errno = 0;	855	errno = 0;
525	}	856	}
		857
526	#endif	858	#endif
527		859
528	#if !HAVE_READDIR_R	860	#if !HAVE_READDIR_R
529	# define readdir_r aio_readdir_r	861	# define readdir_r aio_readdir_r
530		862
…		…
533	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	865	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
534	{	866	{
535	struct dirent *e;	867	struct dirent *e;
536	int errorno;	868	int errorno;
537		869
538	pthread_mutex_lock (&readdirlock);	870	LOCK (readdirlock);
539		871
540	e = readdir (dirp);	872	e = readdir (dirp);
541	errorno = errno;	873	errorno = errno;
542		874
543	if (e)	875	if (e)
…		…
546	strcpy (ent->d_name, e->d_name);	878	strcpy (ent->d_name, e->d_name);
547	}	879	}
548	else	880	else
549	*res = 0;	881	*res = 0;
550		882
551	pthread_mutex_unlock (&readdirlock);	883	UNLOCK (readdirlock);
552		884
553	errno = errorno;	885	errno = errorno;
554	return e ? 0 : -1;	886	return e ? 0 : -1;
555	}	887	}
556	#endif	888	#endif
557		889
558	/* sendfile always needs emulation */	890	/* sendfile always needs emulation */
559	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)	891	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
560	{	892	{
561	ssize_t res;	893	ssize_t res;
562		894
563	if (!count)	895	if (!count)
564	return 0;	896	return 0;
…		…
575	{	907	{
576	off_t sbytes;	908	off_t sbytes;
577	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	909	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
578		910
579	if (res < 0 && sbytes)	911	if (res < 0 && sbytes)
580	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	912	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
581	res = sbytes;	913	res = sbytes;
582	}	914	}
583		915
584	# elif __hpux	916	# elif __hpux
585	res = sendfile (ofd, ifd, offset, count, 0, 0);	917	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
613	#endif	945	#endif
614	)	946	)
615	)	947	)
616	{	948	{
617	/* emulate sendfile. this is a major pain in the ass */	949	/* emulate sendfile. this is a major pain in the ass */
618	char buf[4096];	950	dBUF;
		951
619	res = 0;	952	res = 0;
620		953
621	while (count)	954	while (count)
622	{	955	{
623	ssize_t cnt;	956	ssize_t cnt;
624		957
625	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	958	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
626		959
627	if (cnt <= 0)	960	if (cnt <= 0)
628	{	961	{
629	if (cnt && !res) res = -1;	962	if (cnt && !res) res = -1;
630	break;	963	break;
631	}	964	}
632		965
633	cnt = write (ofd, buf, cnt);	966	cnt = write (ofd, aio_buf, cnt);
634		967
635	if (cnt <= 0)	968	if (cnt <= 0)
636	{	969	{
637	if (cnt && !res) res = -1;	970	if (cnt && !res) res = -1;
638	break;	971	break;
…		…
646		979
647	return res;	980	return res;
648	}	981	}
649		982
650	/* read a full directory */	983	/* read a full directory */
651	static int scandir_ (const char *path, void **namesp)	984	static void scandir_ (aio_req req, worker *self)
652	{	985	{
653	DIR *dirp = opendir (path);	986	DIR *dirp;
654	union	987	union
655	{	988	{
656	struct dirent d;	989	struct dirent d;
657	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	990	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
658	} u;	991	} *u;
659	struct dirent *entp;	992	struct dirent *entp;
660	char *name, *names;	993	char *name, *names;
661	int memlen = 4096;	994	int memlen = 4096;
662	int memofs = 0;	995	int memofs = 0;
663	int res = 0;	996	int res = 0;
664	int errorno;	997	int errorno;
665		998
666	if (!dirp)	999	LOCK (wrklock);
667	return -1;	1000	self->dirp = dirp = opendir (req->ptr1);
668		1001	self->dbuf = u = malloc (sizeof (*u));
669	names = malloc (memlen);	1002	req->ptr2 = names = malloc (memlen);
		1003	UNLOCK (wrklock);
		1004
		1005	if (dirp && u && names)
		1006	for (;;)
		1007	{
		1008	errno = 0;
		1009	readdir_r (dirp, &u->d, &entp);
		1010
		1011	if (!entp)
		1012	break;
		1013
		1014	name = entp->d_name;
		1015
		1016	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1017	{
		1018	int len = strlen (name) + 1;
		1019
		1020	res++;
		1021
		1022	while (memofs + len > memlen)
		1023	{
		1024	memlen *= 2;
		1025	LOCK (wrklock);
		1026	req->ptr2 = names = realloc (names, memlen);
		1027	UNLOCK (wrklock);
		1028
		1029	if (!names)
		1030	break;
		1031	}
		1032
		1033	memcpy (names + memofs, name, len);
		1034	memofs += len;
		1035	}
		1036	}
		1037
		1038	if (errno)
		1039	res = -1;
		1040
		1041	req->result = res;
		1042	}
		1043
		1044	/*****************************************************************************/
		1045
		1046	static void *aio_proc (void *thr_arg)
		1047	{
		1048	aio_req req;
		1049	struct timespec ts;
		1050	worker *self = (worker *)thr_arg;
		1051
		1052	/* try to distribute timeouts somewhat evenly */
		1053	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1054	* (1000000000UL / 1024UL);
670		1055
671	for (;;)	1056	for (;;)
672	{	1057	{
673	errno = 0, readdir_r (dirp, &u.d, &entp);	1058	ts.tv_sec = time (0) + IDLE_TIMEOUT;
674		1059
675	if (!entp)	1060	LOCK (reqlock);
676	break;
677
678	name = entp->d_name;
679
680	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
681	{
682	int len = strlen (name) + 1;
683
684	res++;
685
686	while (memofs + len > memlen)
687	{
688	memlen *= 2;
689	names = realloc (names, memlen);
690	if (!names)
691	break;
692	}
693
694	memcpy (names + memofs, name, len);
695	memofs += len;
696	}
697	}
698
699	errorno = errno;
700	closedir (dirp);
701
702	if (errorno)
703	{
704	free (names);
705	errno = errorno;
706	res = -1;
707	}
708
709	*namesp = (void *)names;
710	return res;
711	}
712
713	/*****************************************************************************/
714
715	static void *aio_proc (void *thr_arg)
716	{
717	aio_req req;
718	int type;
719
720	do
721	{
722	pthread_mutex_lock (&reqlock);
723		1061
724	for (;;)	1062	for (;;)
725	{	1063	{
726	req = reqs;	1064	self->req = req = reqq_shift (&req_queue);
727
728	if (reqs)
729	{
730	reqs = reqs->next;
731	if (!reqs) reqe = 0;
732	}
733		1065
734	if (req)	1066	if (req)
735	break;	1067	break;
736		1068
		1069	++idle;
		1070
		1071	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1072	== ETIMEDOUT)
		1073	{
		1074	if (idle > max_idle)
		1075	{
		1076	--idle;
		1077	UNLOCK (reqlock);
		1078	LOCK (wrklock);
		1079	--started;
		1080	UNLOCK (wrklock);
		1081	goto quit;
		1082	}
		1083
		1084	/* we are allowed to idle, so do so without any timeout */
737	pthread_cond_wait (&reqwait, &reqlock);	1085	pthread_cond_wait (&reqwait, &reqlock);
		1086	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1087	}
		1088
		1089	--idle;
738	}	1090	}
739		1091
740	pthread_mutex_unlock (&reqlock);	1092	--nready;
		1093
		1094	UNLOCK (reqlock);
741		1095
742	errno = 0; /* strictly unnecessary */	1096	errno = 0; /* strictly unnecessary */
743		1097
744	if (!req->cancelled)	1098	if (!(req->flags & FLAG_CANCELLED))
745	switch (req->type)	1099	switch (req->type)
746	{	1100	{
747	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1101	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
748	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1102	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
749		1103
750	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1104	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
751	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1105	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
752		1106
753	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1107	case REQ_STAT: req->result = stat (req->ptr1, req->statdata); break;
754	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1108	case REQ_LSTAT: req->result = lstat (req->ptr1, req->statdata); break;
755	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1109	case REQ_FSTAT: req->result = fstat (req->int1, req->statdata); break;
756		1110
757	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1111	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
758	case REQ_CLOSE: req->result = close (req->fd); break;	1112	case REQ_CLOSE: req->result = close (req->int1); break;
759	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1113	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
760	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1114	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
761	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1115	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
762	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1116	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
763	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1117	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1118	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1119	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
764		1120
765	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1121	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
766	case REQ_FSYNC: req->result = fsync (req->fd); break;	1122	case REQ_FSYNC: req->result = fsync (req->int1); break;
767	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1123	case REQ_READDIR: scandir_ (req, self); break;
768		1124
769	case REQ_SLEEP:	1125	case REQ_BUSY:
770	{	1126	{
771	struct timeval tv;	1127	struct timeval tv;
772		1128
773	tv.tv_sec = req->fd;	1129	tv.tv_sec = req->int1;
774	tv.tv_usec = req->fd2;	1130	tv.tv_usec = req->int2;
775		1131
776	req->result = select (0, 0, 0, 0, &tv);	1132	req->result = select (0, 0, 0, 0, &tv);
777	}	1133	}
778		1134
		1135	case REQ_GROUP:
		1136	case REQ_NOP:
		1137	break;
		1138
779	case REQ_QUIT:	1139	case REQ_QUIT:
780	break;	1140	goto quit;
781		1141
782	default:	1142	default:
783	req->result = ENOSYS;	1143	req->result = ENOSYS;
784	break;	1144	break;
785	}	1145	}
786		1146
787	req->errorno = errno;	1147	req->errorno = errno;
788		1148
789	pthread_mutex_lock (&reslock);	1149	LOCK (reslock);
790		1150
791	req->next = 0;	1151	++npending;
792		1152
793	if (rese)	1153	if (!reqq_push (&res_queue, req))
794	{
795	rese->next = req;
796	rese = req;
797	}
798	else
799	{
800	rese = ress = req;
801
802	/* write a dummy byte to the pipe so fh becomes ready */	1154	/* write a dummy byte to the pipe so fh becomes ready */
803	write (respipe [1], &respipe, 1);	1155	write (respipe [1], &respipe, 1);
804	}
805		1156
806	pthread_mutex_unlock (&reslock);	1157	self->req = 0;
		1158	worker_clear (self);
		1159
		1160	UNLOCK (reslock);
807	}	1161	}
808	while (type != REQ_QUIT);	1162
		1163	quit:
		1164	LOCK (wrklock);
		1165	worker_free (self);
		1166	UNLOCK (wrklock);
809		1167
810	return 0;	1168	return 0;
811	}	1169	}
812		1170
813	/*****************************************************************************/	1171	/*****************************************************************************/
814		1172
815	static void atfork_prepare (void)	1173	static void atfork_prepare (void)
816	{	1174	{
817	pthread_mutex_lock (&reqlock);	1175	LOCK (wrklock);
818	pthread_mutex_lock (&reslock);	1176	LOCK (reqlock);
		1177	LOCK (reslock);
819	#if !HAVE_PREADWRITE	1178	#if !HAVE_PREADWRITE
820	pthread_mutex_lock (&preadwritelock);	1179	LOCK (preadwritelock);
821	#endif	1180	#endif
822	#if !HAVE_READDIR_R	1181	#if !HAVE_READDIR_R
823	pthread_mutex_lock (&readdirlock);	1182	LOCK (readdirlock);
824	#endif	1183	#endif
825	}	1184	}
826		1185
827	static void atfork_parent (void)	1186	static void atfork_parent (void)
828	{	1187	{
829	#if !HAVE_READDIR_R	1188	#if !HAVE_READDIR_R
830	pthread_mutex_unlock (&readdirlock);	1189	UNLOCK (readdirlock);
831	#endif	1190	#endif
832	#if !HAVE_PREADWRITE	1191	#if !HAVE_PREADWRITE
833	pthread_mutex_unlock (&preadwritelock);	1192	UNLOCK (preadwritelock);
834	#endif	1193	#endif
835	pthread_mutex_unlock (&reslock);	1194	UNLOCK (reslock);
836	pthread_mutex_unlock (&reqlock);	1195	UNLOCK (reqlock);
		1196	UNLOCK (wrklock);
837	}	1197	}
838		1198
839	static void atfork_child (void)	1199	static void atfork_child (void)
840	{	1200	{
841	aio_req prv;	1201	aio_req prv;
842		1202
		1203	while (prv = reqq_shift (&req_queue))
		1204	req_free (prv);
		1205
		1206	while (prv = reqq_shift (&res_queue))
		1207	req_free (prv);
		1208
		1209	while (wrk_first.next != &wrk_first)
		1210	{
		1211	worker *wrk = wrk_first.next;
		1212
		1213	if (wrk->req)
		1214	req_free (wrk->req);
		1215
		1216	worker_clear (wrk);
		1217	worker_free (wrk);
		1218	}
		1219
843	started = 0;	1220	started = 0;
844		1221	idle = 0;
845	while (reqs)	1222	nreqs = 0;
846	{	1223	nready = 0;
847	prv = reqs;	1224	npending = 0;
848	reqs = prv->next;
849	req_free (prv);
850	}
851
852	reqs = reqe = 0;
853
854	while (ress)
855	{
856	prv = ress;
857	ress = prv->next;
858	req_free (prv);
859	}
860
861	ress = rese = 0;
862		1225
863	close (respipe [0]);	1226	close (respipe [0]);
864	close (respipe [1]);	1227	close (respipe [1]);
865	create_pipe ();	1228	create_pipe ();
866		1229
867	atfork_parent ();	1230	atfork_parent ();
868	}	1231	}
869		1232
870	#define dREQ \	1233	#define dREQ \
871	aio_req req; \	1234	aio_req req; \
		1235	int req_pri = next_pri; \
		1236	next_pri = DEFAULT_PRI + PRI_BIAS; \
872	\	1237	\
873	if (SvOK (callback) && !SvROK (callback)) \	1238	if (SvOK (callback) && !SvROK (callback)) \
874	croak ("callback must be undef or of reference type"); \	1239	croak ("callback must be undef or of reference type"); \
875	\	1240	\
876	Newz (0, req, 1, aio_cb); \	1241	Newz (0, req, 1, aio_cb); \
877	if (!req) \	1242	if (!req) \
878	croak ("out of memory during aio_req allocation"); \	1243	croak ("out of memory during aio_req allocation"); \
879	\	1244	\
880	req->callback = newSVsv (callback)	1245	req->callback = newSVsv (callback); \
		1246	req->pri = req_pri
881		1247
882	#define REQ_SEND \	1248	#define REQ_SEND \
883	req_send (req); \	1249	req_send (req); \
884	\	1250	\
885	if (GIMME_V != G_VOID) \	1251	if (GIMME_V != G_VOID) \
…		…
890	PROTOTYPES: ENABLE	1256	PROTOTYPES: ENABLE
891		1257
892	BOOT:	1258	BOOT:
893	{	1259	{
894	HV *stash = gv_stashpv ("IO::AIO", 1);	1260	HV *stash = gv_stashpv ("IO::AIO", 1);
		1261
895	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1262	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
896	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1263	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
897	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));	1264	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1265	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1266	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1267	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
898		1268
899	create_pipe ();	1269	create_pipe ();
900	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1270	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
901	}	1271	}
902		1272
903	void	1273	void
904	min_parallel (nthreads)	1274	max_poll_reqs (int nreqs)
905	int nthreads
906	PROTOTYPE: $	1275	PROTOTYPE: $
		1276	CODE:
		1277	max_poll_reqs = nreqs;
907		1278
908	void	1279	void
909	max_parallel (nthreads)	1280	max_poll_time (double nseconds)
910	int nthreads
911	PROTOTYPE: $	1281	PROTOTYPE: $
		1282	CODE:
		1283	max_poll_time = nseconds * AIO_TICKS;
		1284
		1285	void
		1286	min_parallel (int nthreads)
		1287	PROTOTYPE: $
		1288
		1289	void
		1290	max_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_idle (int nthreads)
		1295	PROTOTYPE: $
		1296	CODE:
		1297	set_max_idle (nthreads);
912		1298
913	int	1299	int
914	max_outstanding (nreqs)	1300	max_outstanding (int maxreqs)
915	int nreqs	1301	PROTOTYPE: $
916	PROTOTYPE: $
917	CODE:	1302	CODE:
918	RETVAL = max_outstanding;	1303	RETVAL = max_outstanding;
919	max_outstanding = nreqs;	1304	max_outstanding = maxreqs;
		1305	OUTPUT:
		1306	RETVAL
920		1307
921	void	1308	void
922	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1309	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
923	SV * pathname	1310	SV * pathname
924	int flags	1311	int flags
…		…
928	PPCODE:	1315	PPCODE:
929	{	1316	{
930	dREQ;	1317	dREQ;
931		1318
932	req->type = REQ_OPEN;	1319	req->type = REQ_OPEN;
933	req->data = newSVsv (pathname);	1320	req->sv1 = newSVsv (pathname);
934	req->dataptr = SvPVbyte_nolen (req->data);	1321	req->ptr1 = SvPVbyte_nolen (pathname);
935	req->fd = flags;	1322	req->int1 = flags;
936	req->mode = mode;	1323	req->mode = mode;
937		1324
938	REQ_SEND;	1325	REQ_SEND;
939	}	1326	}
940		1327
…		…
950	PPCODE:	1337	PPCODE:
951	{	1338	{
952	dREQ;	1339	dREQ;
953		1340
954	req->type = ix;	1341	req->type = ix;
955	req->fh = newSVsv (fh);	1342	req->fh = newSVsv (fh);
956	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1343	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
957		1344
958	REQ_SEND (req);	1345	REQ_SEND (req);
959	}	1346	}
960		1347
961	void	1348	void
…		…
970	aio_read = REQ_READ	1357	aio_read = REQ_READ
971	aio_write = REQ_WRITE	1358	aio_write = REQ_WRITE
972	PROTOTYPE: $$$$$;$	1359	PROTOTYPE: $$$$$;$
973	PPCODE:	1360	PPCODE:
974	{	1361	{
975	aio_req req;
976	STRLEN svlen;	1362	STRLEN svlen;
977	char *svptr = SvPVbyte (data, svlen);	1363	char *svptr = SvPVbyte (data, svlen);
978		1364
979	SvUPGRADE (data, SVt_PV);	1365	SvUPGRADE (data, SVt_PV);
980	SvPOK_on (data);	1366	SvPOK_on (data);
…		…
1002		1388
1003	{	1389	{
1004	dREQ;	1390	dREQ;
1005		1391
1006	req->type = ix;	1392	req->type = ix;
1007	req->fh = newSVsv (fh);	1393	req->fh = newSVsv (fh);
1008	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1394	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
1009	: IoOFP (sv_2io (fh)));	1395	: IoOFP (sv_2io (fh)));
1010	req->offset = offset;	1396	req->offs = offset;
1011	req->length = length;	1397	req->size = length;
1012	req->data = SvREFCNT_inc (data);	1398	req->sv1 = SvREFCNT_inc (data);
1013	req->dataptr = (char *)svptr + dataoffset;	1399	req->ptr1 = (char *)svptr + dataoffset;
		1400	req->stroffset = dataoffset;
1014		1401
1015	if (!SvREADONLY (data))	1402	if (!SvREADONLY (data))
1016	{	1403	{
1017	SvREADONLY_on (data);	1404	SvREADONLY_on (data);
1018	req->data2ptr = (void *)data;	1405	req->flags |= FLAG_DATA_RO_OFF;
1019	}	1406	}
1020		1407
1021	REQ_SEND;	1408	REQ_SEND;
1022	}	1409	}
		1410	}
		1411
		1412	void
		1413	aio_readlink (path,callback=&PL_sv_undef)
		1414	SV * path
		1415	SV * callback
		1416	PROTOTYPE: $$;$
		1417	PPCODE:
		1418	{
		1419	SV *data;
		1420	dREQ;
		1421
		1422	data = newSV (NAME_MAX);
		1423	SvPOK_on (data);
		1424
		1425	req->type = REQ_READLINK;
		1426	req->fh = newSVsv (path);
		1427	req->ptr2 = SvPVbyte_nolen (path);
		1428	req->sv1 = data;
		1429	req->ptr1 = SvPVbyte_nolen (data);
		1430
		1431	REQ_SEND;
1023	}	1432	}
1024		1433
1025	void	1434	void
1026	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1435	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
1027	SV * out_fh	1436	SV * out_fh
…		…
1033	PPCODE:	1442	PPCODE:
1034	{	1443	{
1035	dREQ;	1444	dREQ;
1036		1445
1037	req->type = REQ_SENDFILE;	1446	req->type = REQ_SENDFILE;
1038	req->fh = newSVsv (out_fh);	1447	req->fh = newSVsv (out_fh);
1039	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1040	req->fh2 = newSVsv (in_fh);	1449	req->sv2 = newSVsv (in_fh);
1041	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1450	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1042	req->offset = in_offset;	1451	req->offs = in_offset;
1043	req->length = length;	1452	req->size = length;
1044		1453
1045	REQ_SEND;	1454	REQ_SEND;
1046	}	1455	}
1047		1456
1048	void	1457	void
…		…
1055	PPCODE:	1464	PPCODE:
1056	{	1465	{
1057	dREQ;	1466	dREQ;
1058		1467
1059	req->type = REQ_READAHEAD;	1468	req->type = REQ_READAHEAD;
1060	req->fh = newSVsv (fh);	1469	req->fh = newSVsv (fh);
1061	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1470	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1062	req->offset = offset;	1471	req->offs = offset;
1063	req->length = length;	1472	req->size = length;
1064		1473
1065	REQ_SEND;	1474	REQ_SEND;
1066	}	1475	}
1067		1476
1068	void	1477	void
…		…
1084	}	1493	}
1085		1494
1086	if (SvPOK (fh_or_path))	1495	if (SvPOK (fh_or_path))
1087	{	1496	{
1088	req->type = ix;	1497	req->type = ix;
1089	req->data = newSVsv (fh_or_path);	1498	req->sv1 = newSVsv (fh_or_path);
1090	req->dataptr = SvPVbyte_nolen (req->data);	1499	req->ptr1 = SvPVbyte_nolen (fh_or_path);
1091	}	1500	}
1092	else	1501	else
1093	{	1502	{
1094	req->type = REQ_FSTAT;	1503	req->type = REQ_FSTAT;
1095	req->fh = newSVsv (fh_or_path);	1504	req->fh = newSVsv (fh_or_path);
1096	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1505	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1097	}	1506	}
1098		1507
1099	REQ_SEND;	1508	REQ_SEND;
1100	}	1509	}
1101		1510
1102	void	1511	void
1103	aio_unlink (pathname,callback=&PL_sv_undef)	1512	aio_unlink (pathname,callback=&PL_sv_undef)
1104	SV * pathname	1513	SV * pathname
1105	SV * callback	1514	SV * callback
1106	ALIAS:	1515	ALIAS:
1107	aio_unlink = REQ_UNLINK	1516	aio_unlink = REQ_UNLINK
1108	aio_rmdir = REQ_RMDIR	1517	aio_rmdir = REQ_RMDIR
1109	aio_readdir = REQ_READDIR	1518	aio_readdir = REQ_READDIR
1110	PPCODE:	1519	PPCODE:
1111	{	1520	{
1112	dREQ;	1521	dREQ;
1113		1522
1114	req->type = ix;	1523	req->type = ix;
1115	req->data = newSVsv (pathname);	1524	req->sv1 = newSVsv (pathname);
1116	req->dataptr = SvPVbyte_nolen (req->data);	1525	req->ptr1 = SvPVbyte_nolen (pathname);
1117		1526
1118	REQ_SEND;	1527	REQ_SEND;
1119	}	1528	}
1120		1529
1121	void	1530	void
1122	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1531	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1123	SV * oldpath	1532	SV * oldpath
1124	SV * newpath	1533	SV * newpath
1125	SV * callback	1534	SV * callback
1126	ALIAS:	1535	ALIAS:
1127	aio_link = REQ_LINK	1536	aio_link = REQ_LINK
1128	aio_symlink = REQ_SYMLINK	1537	aio_symlink = REQ_SYMLINK
1129	aio_rename = REQ_RENAME	1538	aio_rename = REQ_RENAME
1130	PPCODE:	1539	PPCODE:
1131	{	1540	{
1132	dREQ;	1541	dREQ;
1133		1542
1134	req->type = ix;	1543	req->type = ix;
1135	req->fh = newSVsv (oldpath);	1544	req->fh = newSVsv (oldpath);
1136	req->data2ptr = SvPVbyte_nolen (req->fh);	1545	req->ptr2 = SvPVbyte_nolen (req->fh);
1137	req->data = newSVsv (newpath);	1546	req->sv1 = newSVsv (newpath);
1138	req->dataptr = SvPVbyte_nolen (req->data);	1547	req->ptr1 = SvPVbyte_nolen (newpath);
1139		1548
1140	REQ_SEND;	1549	REQ_SEND;
1141	}	1550	}
1142		1551
1143	void	1552	void
1144	aio_sleep (delay,callback=&PL_sv_undef)	1553	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
1145	double delay	1554	SV * pathname
1146	SV * callback	1555	SV * callback
		1556	UV mode
		1557	UV dev
1147	PPCODE:	1558	PPCODE:
1148	{	1559	{
1149	dREQ;	1560	dREQ;
		1561
		1562	req->type = REQ_MKNOD;
		1563	req->sv1 = newSVsv (pathname);
		1564	req->ptr1 = SvPVbyte_nolen (pathname);
		1565	req->mode = (mode_t)mode;
		1566	req->offs = dev;
		1567
		1568	REQ_SEND;
		1569	}
1150		1570
		1571	void
		1572	aio_busy (delay,callback=&PL_sv_undef)
		1573	double delay
		1574	SV * callback
		1575	PPCODE:
		1576	{
		1577	dREQ;
		1578
1151	req->type = REQ_SLEEP;	1579	req->type = REQ_BUSY;
1152	req->fd = delay < 0. ? 0 : delay;	1580	req->int1 = delay < 0. ? 0 : delay;
1153	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);	1581	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
1154		1582
1155	REQ_SEND;	1583	REQ_SEND;
1156	}	1584	}
1157		1585
1158	void	1586	void
…		…
1160	SV * callback	1588	SV * callback
1161	PROTOTYPE: ;$	1589	PROTOTYPE: ;$
1162	PPCODE:	1590	PPCODE:
1163	{	1591	{
1164	dREQ;	1592	dREQ;
		1593
1165	req->type = REQ_GROUP;	1594	req->type = REQ_GROUP;
1166	req->grp_next = req;
1167	req->grp_prev = req;
1168		1595
1169	req_send (req);	1596	req_send (req);
1170	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1597	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1171	}	1598	}
		1599
		1600	void
		1601	aio_nop (callback=&PL_sv_undef)
		1602	SV * callback
		1603	PPCODE:
		1604	{
		1605	dREQ;
		1606
		1607	req->type = REQ_NOP;
		1608
		1609	REQ_SEND;
		1610	}
		1611
		1612	int
		1613	aioreq_pri (int pri = 0)
		1614	PROTOTYPE: ;$
		1615	CODE:
		1616	RETVAL = next_pri - PRI_BIAS;
		1617	if (items > 0)
		1618	{
		1619	if (pri < PRI_MIN) pri = PRI_MIN;
		1620	if (pri > PRI_MAX) pri = PRI_MAX;
		1621	next_pri = pri + PRI_BIAS;
		1622	}
		1623	OUTPUT:
		1624	RETVAL
		1625
		1626	void
		1627	aioreq_nice (int nice = 0)
		1628	CODE:
		1629	nice = next_pri - nice;
		1630	if (nice < PRI_MIN) nice = PRI_MIN;
		1631	if (nice > PRI_MAX) nice = PRI_MAX;
		1632	next_pri = nice + PRI_BIAS;
1172		1633
1173	void	1634	void
1174	flush ()	1635	flush ()
1175	PROTOTYPE:	1636	PROTOTYPE:
1176	CODE:	1637	CODE:
1177	while (nreqs)	1638	while (nreqs)
1178	{	1639	{
1179	poll_wait ();	1640	poll_wait ();
1180	poll_cb ();	1641	poll_cb (0);
1181	}	1642	}
1182		1643
1183	void	1644	void
1184	poll()	1645	poll()
1185	PROTOTYPE:	1646	PROTOTYPE:
1186	CODE:	1647	CODE:
1187	if (nreqs)	1648	if (nreqs)
1188	{	1649	{
1189	poll_wait ();	1650	poll_wait ();
1190	poll_cb ();	1651	poll_cb (0);
1191	}	1652	}
1192		1653
1193	int	1654	int
1194	poll_fileno()	1655	poll_fileno()
1195	PROTOTYPE:	1656	PROTOTYPE:
…		…
1219	CODE:	1680	CODE:
1220	RETVAL = nreqs;	1681	RETVAL = nreqs;
1221	OUTPUT:	1682	OUTPUT:
1222	RETVAL	1683	RETVAL
1223		1684
1224	PROTOTYPES: DISABLE	1685	int
1225		1686	nready()
1226	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1227
1228	void
1229	cancel (aio_req_ornot req)
1230	PROTOTYPE:	1687	PROTOTYPE:
1231	CODE:	1688	CODE:
		1689	RETVAL = get_nready ();
		1690	OUTPUT:
		1691	RETVAL
		1692
		1693	int
		1694	npending()
		1695	PROTOTYPE:
		1696	CODE:
		1697	RETVAL = get_npending ();
		1698	OUTPUT:
		1699	RETVAL
		1700
		1701	int
		1702	nthreads()
		1703	PROTOTYPE:
		1704	CODE:
		1705	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1706	RETVAL = started;
		1707	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1708	OUTPUT:
		1709	RETVAL
		1710
		1711	PROTOTYPES: DISABLE
		1712
		1713	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1714
		1715	void
		1716	cancel (aio_req_ornot req)
		1717	CODE:
1232	req_cancel (req);	1718	req_cancel (req);
		1719
		1720	void
		1721	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1722	CODE:
		1723	SvREFCNT_dec (req->callback);
		1724	req->callback = newSVsv (callback);
1233		1725
1234	MODULE = IO::AIO PACKAGE = IO::AIO::GRP	1726	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1235		1727
1236	void	1728	void
1237	add (aio_req grp, ...)	1729	add (aio_req grp, ...)
1238	PPCODE:	1730	PPCODE:
1239	{	1731	{
1240	int i;	1732	int i;
		1733	aio_req req;
		1734
		1735	if (grp->int1 == 2)
		1736	croak ("cannot add requests to IO::AIO::GRP after the group finished");
1241		1737
1242	for (i = 1; i < items; ++i )	1738	for (i = 1; i < items; ++i )
1243	{	1739	{
1244	if (GIMME_V != G_VOID)	1740	if (GIMME_V != G_VOID)
1245	XPUSHs (sv_2mortal (newSVsv (ST (i))));	1741	XPUSHs (sv_2mortal (newSVsv (ST (i))));
1246		1742
1247	aio_req req = SvAIO_REQ (ST (i));	1743	req = SvAIO_REQ (ST (i));
1248		1744
1249	if (req)	1745	if (req)
1250	{	1746	{
1251	req->grp_prev = grp;	1747	++grp->size;
1252	req->grp_next = grp->grp_next;
1253	grp->grp_next->grp_prev = req;
1254	grp->grp_next = req;
1255
1256	req->grp = grp;	1748	req->grp = grp;
		1749
		1750	req->grp_prev = 0;
		1751	req->grp_next = grp->grp_first;
		1752
		1753	if (grp->grp_first)
		1754	grp->grp_first->grp_prev = req;
		1755
		1756	grp->grp_first = req;
1257	}	1757	}
1258	}	1758	}
1259	}	1759	}
1260		1760
1261	void	1761	void
		1762	cancel_subs (aio_req_ornot req)
		1763	CODE:
		1764	req_cancel_subs (req);
		1765
		1766	void
1262	result (aio_req grp, ...)	1767	result (aio_req grp, ...)
		1768	CODE:
		1769	{
		1770	int i;
		1771	AV *av;
		1772
		1773	grp->errorno = errno;
		1774
		1775	av = newAV ();
		1776
		1777	for (i = 1; i < items; ++i )
		1778	av_push (av, newSVsv (ST (i)));
		1779
		1780	SvREFCNT_dec (grp->sv1);
		1781	grp->sv1 = (SV *)av;
		1782	}
		1783
		1784	void
		1785	errno (aio_req grp, int errorno = errno)
		1786	CODE:
		1787	grp->errorno = errorno;
		1788
		1789	void
		1790	limit (aio_req grp, int limit)
1263	CODE:	1791	CODE:
1264	{	1792	grp->int2 = limit;
1265	int i;	1793	aio_grp_feed (grp);
1266	AV *av = newAV ();
1267		1794
1268	if (grp->data)	1795	void
		1796	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1797	CODE:
		1798	{
1269	SvREFCNT_dec (grp->data);	1799	SvREFCNT_dec (grp->sv2);
		1800	grp->sv2 = newSVsv (callback);
1270		1801
1271	for (i = 1; i < items; ++i )	1802	if (grp->int2 <= 0)
1272	av_push (av, newSVsv (ST (i)));	1803	grp->int2 = 2;
1273		1804
1274	grp->data = (SV *)av;	1805	aio_grp_feed (grp);
1275	}	1806	}
1276		1807

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