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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.47 by root, Sun Oct 22 10:10:23 2006 UTC vs.
Revision 1.87 by root, Mon Oct 30 23:42:27 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	off_t offs;
		117	size_t size;
		118	ssize_t result;
		119
		120	STRLEN stroffset;
		121	int type;
		122	int int1, int2;
		123	int errorno;
		124	mode_t mode; /* open */
		125
		126	unsigned char flags;
		127	unsigned char pri;
		128
73	SV *self; /* the perl counterpart of this request, if any */	129	SV *self; /* the perl counterpart of this request, if any */
74		130	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;	131	} aio_cb;
		132
		133	enum {
		134	FLAG_CANCELLED = 0x01,
		135	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		136	FLAG_PTR2_FREE = 0x80, /* need free(ptr2) */
		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))
130	{	354	{
131	fd_set rfd;	355	int old_len = grp->size;
132	FD_ZERO(&rfd);
133	FD_SET(respipe [0], &rfd);
134		356
135	select (respipe [0] + 1, &rfd, 0, 0, 0);	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	}
136	}	379	}
137	}	380	}
138		381
		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);
		394	}
		395	}
		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_SV1_RO_OFF)
145	return;	402	SvREADONLY_off (req->sv1);
146		403
147	errno = req->errorno;	404	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
148
149	ENTER;
150	PUSHMARK (SP);
151
152	switch (req->type)
153	{	405	{
154	case REQ_READDIR:	406	ENTER;
		407	SAVETMPS;
		408	PUSHMARK (SP);
		409	EXTEND (SP, 1);
		410
		411	switch (req->type)
155	{	412	{
156	SV *rv = &PL_sv_undef;	413	case REQ_READDIR:
157
158	if (req->result >= 0)
159	{	414	{
160	char *buf = req->data2ptr;	415	SV *rv = &PL_sv_undef;
161	AV *av = newAV ();
162		416
163	while (req->result)	417	if (req->result >= 0)
164	{	418	{
		419	int i;
		420	char *buf = req->ptr2;
		421	AV *av = newAV ();
		422
		423	av_extend (av, req->result - 1);
		424
		425	for (i = 0; i < req->result; ++i)
		426	{
165	SV *sv = newSVpv (buf, 0);	427	SV *sv = newSVpv (buf, 0);
166		428
167	av_push (av, sv);	429	av_store (av, i, sv);
168	buf += SvCUR (sv) + 1;	430	buf += SvCUR (sv) + 1;
169	req->result--;	431	}
		432
		433	rv = sv_2mortal (newRV_noinc ((SV *)av));
170	}	434	}
171		435
172	rv = sv_2mortal (newRV_noinc ((SV *)av));	436	PUSHs (rv);
173	}	437	}
		438	break;
174		439
		440	case REQ_OPEN:
		441	{
		442	/* convert fd to fh */
		443	SV *fh;
		444
		445	PUSHs (sv_2mortal (newSViv (req->result)));
		446	PUTBACK;
		447	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		448	SPAGAIN;
		449
		450	fh = SvREFCNT_inc (POPs);
		451
		452	PUSHMARK (SP);
		453	XPUSHs (sv_2mortal (fh));
		454	}
		455	break;
		456
		457	case REQ_GROUP:
		458	req->int1 = 2; /* mark group as finished */
		459
		460	if (req->sv1)
		461	{
		462	int i;
		463	AV *av = (AV *)req->sv1;
		464
		465	EXTEND (SP, AvFILL (av) + 1);
		466	for (i = 0; i <= AvFILL (av); ++i)
		467	PUSHs (*av_fetch (av, i, 0));
		468	}
		469	break;
		470
		471	case REQ_NOP:
		472	case REQ_BUSY:
		473	break;
		474
		475	case REQ_READLINK:
		476	if (req->result > 0)
		477	{
		478	SvCUR_set (req->sv1, req->result);
		479	*SvEND (req->sv1) = 0;
175	XPUSHs (rv);	480	PUSHs (req->sv1);
		481	}
		482	break;
		483
		484	case REQ_STAT:
		485	case REQ_LSTAT:
		486	case REQ_FSTAT:
		487	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		488	PL_laststatval = req->result;
		489	PL_statcache = *(Stat_t *)(req->ptr2);
		490	PUSHs (sv_2mortal (newSViv (req->result)));
		491	break;
		492
		493	case REQ_READ:
		494	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		495	*SvEND (req->sv1) = 0;
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
		498
		499	default:
		500	PUSHs (sv_2mortal (newSViv (req->result)));
		501	break;
176	}	502	}
177	break;
178		503
179	case REQ_OPEN:	504	errno = req->errorno;
180	{
181	/* convert fd to fh */
182	SV *fh;
183		505
184	XPUSHs (sv_2mortal (newSViv (req->result)));
185	PUTBACK;	506	PUTBACK;
186	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	507	call_sv (req->callback, G_VOID | G_EVAL);
187	SPAGAIN;	508	SPAGAIN;
188		509
189	fh = SvREFCNT_inc (POPs);	510	FREETMPS;
190		511	LEAVE;
191	PUSHMARK (SP);
192	XPUSHs (sv_2mortal (fh));
193	}
194	break;
195
196	case REQ_SLEEP:
197	case REQ_GROUP:
198	break;
199
200	default:
201	XPUSHs (sv_2mortal (newSViv (req->result)));
202	break;
203	}	512	}
204		513
		514	if (req->grp)
		515	{
		516	aio_req grp = req->grp;
205		517
206	PUTBACK;	518	/* unlink request */
207	call_sv (req->callback, G_VOID | G_EVAL);	519	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
208	SPAGAIN;	520	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		521
		522	if (grp->grp_first == req)
		523	grp->grp_first = req->grp_next;
		524
		525	aio_grp_dec (grp);
		526	}
209		527
210	if (SvTRUE (ERRSV))	528	if (SvTRUE (ERRSV))
211	{	529	{
212	req_free (req);	530	req_free (req);
213	croak (0);	531	croak (0);
214	}	532	}
215
216	LEAVE;
217
218	errno = errorno;
219	}	533	}
220		534
221	static void req_free (aio_req req)	535	static void req_free (aio_req req)
222	{	536	{
223	if (req->grp)
224	{
225	aio_req grp = req->grp;
226
227	/* unlink request */
228	req->grp_next->grp_prev = req->grp_prev;
229	req->grp_prev->grp_next = req->grp_next;
230
231	if (grp->grp_next == grp && grp->fd)
232	{
233	req_invoke (grp);
234	req_free (grp);
235	}
236	}
237
238	if (req->self)	537	if (req->self)
239	{	538	{
240	sv_unmagic (req->self, PERL_MAGIC_ext);	539	sv_unmagic (req->self, PERL_MAGIC_ext);
241	SvREFCNT_dec (req->self);	540	SvREFCNT_dec (req->self);
242	}	541	}
243		542
244	if (req->data)
245	SvREFCNT_dec (req->data);
246
247	if (req->fh)
248	SvREFCNT_dec (req->fh);	543	SvREFCNT_dec (req->fh);
249		544	SvREFCNT_dec (req->sv1);
250	if (req->fh2)
251	SvREFCNT_dec (req->fh2);	545	SvREFCNT_dec (req->sv2);
252
253	if (req->statdata)
254	Safefree (req->statdata);
255
256	if (req->callback)
257	SvREFCNT_dec (req->callback);	546	SvREFCNT_dec (req->callback);
258		547
259	if (req->type == REQ_READDIR && req->result >= 0)	548	if (req->flags & FLAG_PTR2_FREE)
260	free (req->data2ptr);	549	free (req->ptr2);
261		550
262	Safefree (req);	551	Safefree (req);
263	}	552	}
264		553
		554	static void req_cancel_subs (aio_req grp)
		555	{
		556	aio_req sub;
		557
		558	if (grp->type != REQ_GROUP)
		559	return;
		560
		561	SvREFCNT_dec (grp->sv2);
		562	grp->sv2 = 0;
		563
		564	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		565	req_cancel (sub);
		566	}
		567
265	static void req_cancel (aio_req req)	568	static void req_cancel (aio_req req)
266	{	569	{
267	req->cancelled = 1;	570	req->flags |= FLAG_CANCELLED;
268		571
269	if (req->type == REQ_GROUP)	572	req_cancel_subs (req);
270	{
271	aio_req sub;
272
273	for (sub = req->grp_next; sub != req; sub = sub->grp_next)
274	req_cancel (sub);
275	}
276	}
277
278	static int poll_cb ()
279	{
280	dSP;
281	int count = 0;
282	int do_croak = 0;
283	aio_req req;
284
285	for (;;)
286	{
287	pthread_mutex_lock (&reslock);
288	req = ress;
289
290	if (req)
291	{
292	ress = req->next;
293
294	if (!ress)
295	{
296	/* read any signals sent by the worker threads */
297	char buf [32];
298	while (read (respipe [0], buf, 32) == 32)
299	;
300
301	rese = 0;
302	}
303	}
304
305	pthread_mutex_unlock (&reslock);
306
307	if (!req)
308	break;
309
310	nreqs--;
311
312	if (req->type == REQ_QUIT)
313	started--;
314	else if (req->type == REQ_GROUP && req->grp_next != req)
315	{
316	req->fd = 1; /* mark request as delayed */
317	continue;
318	}
319	else
320	{
321	if (req->type == REQ_READ)
322	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
323
324	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
325	SvREADONLY_off (req->data);
326
327	if (req->statdata)
328	{
329	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
330	PL_laststatval = req->result;
331	PL_statcache = *(req->statdata);
332	}
333
334	req_invoke (req);
335
336	count++;
337	}
338
339	req_free (req);
340	}
341
342	return count;
343	}	573	}
344		574
345	static void *aio_proc(void *arg);	575	static void *aio_proc(void *arg);
346		576
347	static void start_thread (void)	577	static void start_thread (void)
348	{	578	{
349	sigset_t fullsigset, oldsigset;	579	sigset_t fullsigset, oldsigset;
350	pthread_t tid;
351	pthread_attr_t attr;	580	pthread_attr_t attr;
		581
		582	worker *wrk = calloc (1, sizeof (worker));
		583
		584	if (!wrk)
		585	croak ("unable to allocate worker thread data");
352		586
353	pthread_attr_init (&attr);	587	pthread_attr_init (&attr);
354	pthread_attr_setstacksize (&attr, STACKSIZE);	588	pthread_attr_setstacksize (&attr, STACKSIZE);
355	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	589	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		590	#ifdef PTHREAD_SCOPE_PROCESS
		591	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		592	#endif
356		593
357	sigfillset (&fullsigset);	594	sigfillset (&fullsigset);
		595
		596	LOCK (wrklock);
358	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	597	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
359		598
360	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	599	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
361	started++;
362
363	sigprocmask (SIG_SETMASK, &oldsigset, 0);
364	}
365
366	static void req_send (aio_req req)
367	{
368	while (started < wanted && nreqs >= started)
369	start_thread ();
370
371	nreqs++;
372
373	pthread_mutex_lock (&reqlock);
374
375	req->next = 0;
376
377	if (reqe)
378	{	600	{
379	reqe->next = req;	601	wrk->prev = &wrk_first;
380	reqe = req;	602	wrk->next = wrk_first.next;
		603	wrk_first.next->prev = wrk;
		604	wrk_first.next = wrk;
		605	++started;
381	}	606	}
382	else	607	else
383	reqe = reqs = req;	608	free (wrk);
384		609
		610	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		611	UNLOCK (wrklock);
		612	}
		613
		614	static void maybe_start_thread ()
		615	{
		616	if (get_nthreads () >= wanted)
		617	return;
		618
		619	/* todo: maybe use idle here, but might be less exact */
		620	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		621	return;
		622
		623	start_thread ();
		624	}
		625
		626	static void req_send (aio_req req)
		627	{
		628	++nreqs;
		629
		630	LOCK (reqlock);
		631	++nready;
		632	reqq_push (&req_queue, req);
385	pthread_cond_signal (&reqwait);	633	pthread_cond_signal (&reqwait);
386	pthread_mutex_unlock (&reqlock);	634	UNLOCK (reqlock);
387		635
388	if (nreqs > max_outstanding)	636	maybe_start_thread ();
389	for (;;)
390	{
391	poll_cb ();
392
393	if (nreqs <= max_outstanding)
394	break;
395
396	poll_wait ();
397	}
398	}	637	}
399		638
400	static void end_thread (void)	639	static void end_thread (void)
401	{	640	{
402	aio_req req;	641	aio_req req;
		642
403	Newz (0, req, 1, aio_cb);	643	Newz (0, req, 1, aio_cb);
		644
404	req->type = REQ_QUIT;	645	req->type = REQ_QUIT;
		646	req->pri = PRI_MAX + PRI_BIAS;
405		647
406	req_send (req);	648	LOCK (reqlock);
		649	reqq_push (&req_queue, req);
		650	pthread_cond_signal (&reqwait);
		651	UNLOCK (reqlock);
		652
		653	LOCK (wrklock);
		654	--started;
		655	UNLOCK (wrklock);
		656	}
		657
		658	static void set_max_idle (int nthreads)
		659	{
		660	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		661	max_idle = nthreads <= 0 ? 1 : nthreads;
		662	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
407	}	663	}
408		664
409	static void min_parallel (int nthreads)	665	static void min_parallel (int nthreads)
410	{	666	{
411	if (wanted < nthreads)	667	if (wanted < nthreads)
412	wanted = nthreads;	668	wanted = nthreads;
413	}	669	}
414		670
415	static void max_parallel (int nthreads)	671	static void max_parallel (int nthreads)
416	{	672	{
417	int cur = started;
418
419	if (wanted > nthreads)	673	if (wanted > nthreads)
420	wanted = nthreads;	674	wanted = nthreads;
421		675
422	while (cur > wanted)	676	while (started > wanted)
		677	end_thread ();
		678	}
		679
		680	static void poll_wait ()
		681	{
		682	fd_set rfd;
		683
		684	while (nreqs)
423	{	685	{
		686	int size;
		687	if (WORDACCESS_UNSAFE) LOCK (reslock);
		688	size = res_queue.size;
		689	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		690
		691	if (size)
		692	return;
		693
424	end_thread ();	694	maybe_start_thread ();
425	cur--;	695
		696	FD_ZERO(&rfd);
		697	FD_SET(respipe [0], &rfd);
		698
		699	select (respipe [0] + 1, &rfd, 0, 0, 0);
426	}	700	}
		701	}
427		702
428	while (started > wanted)	703	static int poll_cb ()
		704	{
		705	dSP;
		706	int count = 0;
		707	int maxreqs = max_poll_reqs;
		708	int do_croak = 0;
		709	struct timeval tv_start, tv_now;
		710	aio_req req;
		711
		712	if (max_poll_time)
		713	gettimeofday (&tv_start, 0);
		714
		715	for (;;)
429	{	716	{
		717	for (;;)
		718	{
		719	maybe_start_thread ();
		720
		721	LOCK (reslock);
		722	req = reqq_shift (&res_queue);
		723
		724	if (req)
		725	{
		726	--npending;
		727
		728	if (!res_queue.size)
		729	{
		730	/* read any signals sent by the worker threads */
		731	char buf [32];
		732	while (read (respipe [0], buf, 32) == 32)
		733	;
		734	}
		735	}
		736
		737	UNLOCK (reslock);
		738
		739	if (!req)
		740	break;
		741
		742	--nreqs;
		743
		744	if (req->type == REQ_GROUP && req->size)
		745	{
		746	req->int1 = 1; /* mark request as delayed */
		747	continue;
		748	}
		749	else
		750	{
		751	req_invoke (req);
		752
		753	count++;
		754	}
		755
		756	req_free (req);
		757
		758	if (maxreqs && !--maxreqs)
		759	break;
		760
		761	if (max_poll_time)
		762	{
		763	gettimeofday (&tv_now, 0);
		764
		765	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		766	break;
		767	}
		768	}
		769
		770	if (nreqs <= max_outstanding)
		771	break;
		772
430	poll_wait ();	773	poll_wait ();
431	poll_cb ();	774
		775	++maxreqs;
432	}	776	}
		777
		778	return count;
433	}	779	}
434		780
435	static void create_pipe ()	781	static void create_pipe ()
436	{	782	{
437	if (pipe (respipe))	783	if (pipe (respipe))
…		…
461	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)	807	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
462	{	808	{
463	ssize_t res;	809	ssize_t res;
464	off_t ooffset;	810	off_t ooffset;
465		811
466	pthread_mutex_lock (&preadwritelock);	812	LOCK (preadwritelock);
467	ooffset = lseek (fd, 0, SEEK_CUR);	813	ooffset = lseek (fd, 0, SEEK_CUR);
468	lseek (fd, offset, SEEK_SET);	814	lseek (fd, offset, SEEK_SET);
469	res = read (fd, buf, count);	815	res = read (fd, buf, count);
470	lseek (fd, ooffset, SEEK_SET);	816	lseek (fd, ooffset, SEEK_SET);
471	pthread_mutex_unlock (&preadwritelock);	817	UNLOCK (preadwritelock);
472		818
473	return res;	819	return res;
474	}	820	}
475		821
476	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)	822	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
477	{	823	{
478	ssize_t res;	824	ssize_t res;
479	off_t ooffset;	825	off_t ooffset;
480		826
481	pthread_mutex_lock (&preadwritelock);	827	LOCK (preadwritelock);
482	ooffset = lseek (fd, 0, SEEK_CUR);	828	ooffset = lseek (fd, 0, SEEK_CUR);
483	lseek (fd, offset, SEEK_SET);	829	lseek (fd, offset, SEEK_SET);
484	res = write (fd, buf, count);	830	res = write (fd, buf, count);
485	lseek (fd, offset, SEEK_SET);	831	lseek (fd, offset, SEEK_SET);
486	pthread_mutex_unlock (&preadwritelock);	832	UNLOCK (preadwritelock);
487		833
488	return res;	834	return res;
489	}	835	}
490	#endif	836	#endif
491		837
492	#if !HAVE_FDATASYNC	838	#if !HAVE_FDATASYNC
493	# define fdatasync fsync	839	# define fdatasync fsync
494	#endif	840	#endif
495		841
496	#if !HAVE_READAHEAD	842	#if !HAVE_READAHEAD
497	# define readahead aio_readahead	843	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
498		844
499	static ssize_t readahead (int fd, off_t offset, size_t count)	845	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
500	{	846	{
501	char readahead_buf[4096];	847	dBUF;
502		848
503	while (count > 0)	849	while (count > 0)
504	{	850	{
505	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	851	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
506		852
507	pread (fd, readahead_buf, len, offset);	853	pread (fd, aio_buf, len, offset);
508	offset += len;	854	offset += len;
509	count -= len;	855	count -= len;
510	}	856	}
511		857
512	errno = 0;	858	errno = 0;
513	}	859	}
		860
514	#endif	861	#endif
515		862
516	#if !HAVE_READDIR_R	863	#if !HAVE_READDIR_R
517	# define readdir_r aio_readdir_r	864	# define readdir_r aio_readdir_r
518		865
…		…
521	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	868	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
522	{	869	{
523	struct dirent *e;	870	struct dirent *e;
524	int errorno;	871	int errorno;
525		872
526	pthread_mutex_lock (&readdirlock);	873	LOCK (readdirlock);
527		874
528	e = readdir (dirp);	875	e = readdir (dirp);
529	errorno = errno;	876	errorno = errno;
530		877
531	if (e)	878	if (e)
…		…
534	strcpy (ent->d_name, e->d_name);	881	strcpy (ent->d_name, e->d_name);
535	}	882	}
536	else	883	else
537	*res = 0;	884	*res = 0;
538		885
539	pthread_mutex_unlock (&readdirlock);	886	UNLOCK (readdirlock);
540		887
541	errno = errorno;	888	errno = errorno;
542	return e ? 0 : -1;	889	return e ? 0 : -1;
543	}	890	}
544	#endif	891	#endif
545		892
546	/* sendfile always needs emulation */	893	/* sendfile always needs emulation */
547	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)	894	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
548	{	895	{
549	ssize_t res;	896	ssize_t res;
550		897
551	if (!count)	898	if (!count)
552	return 0;	899	return 0;
…		…
563	{	910	{
564	off_t sbytes;	911	off_t sbytes;
565	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	912	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
566		913
567	if (res < 0 && sbytes)	914	if (res < 0 && sbytes)
568	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	915	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
569	res = sbytes;	916	res = sbytes;
570	}	917	}
571		918
572	# elif __hpux	919	# elif __hpux
573	res = sendfile (ofd, ifd, offset, count, 0, 0);	920	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
601	#endif	948	#endif
602	)	949	)
603	)	950	)
604	{	951	{
605	/* emulate sendfile. this is a major pain in the ass */	952	/* emulate sendfile. this is a major pain in the ass */
606	char buf[4096];	953	dBUF;
		954
607	res = 0;	955	res = 0;
608		956
609	while (count)	957	while (count)
610	{	958	{
611	ssize_t cnt;	959	ssize_t cnt;
612		960
613	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	961	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
614		962
615	if (cnt <= 0)	963	if (cnt <= 0)
616	{	964	{
617	if (cnt && !res) res = -1;	965	if (cnt && !res) res = -1;
618	break;	966	break;
619	}	967	}
620		968
621	cnt = write (ofd, buf, cnt);	969	cnt = write (ofd, aio_buf, cnt);
622		970
623	if (cnt <= 0)	971	if (cnt <= 0)
624	{	972	{
625	if (cnt && !res) res = -1;	973	if (cnt && !res) res = -1;
626	break;	974	break;
…		…
634		982
635	return res;	983	return res;
636	}	984	}
637		985
638	/* read a full directory */	986	/* read a full directory */
639	static int scandir_ (const char *path, void **namesp)	987	static void scandir_ (aio_req req, worker *self)
640	{	988	{
641	DIR *dirp = opendir (path);	989	DIR *dirp;
642	union	990	union
643	{	991	{
644	struct dirent d;	992	struct dirent d;
645	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	993	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
646	} u;	994	} *u;
647	struct dirent *entp;	995	struct dirent *entp;
648	char *name, *names;	996	char *name, *names;
649	int memlen = 4096;	997	int memlen = 4096;
650	int memofs = 0;	998	int memofs = 0;
651	int res = 0;	999	int res = 0;
652	int errorno;	1000	int errorno;
653		1001
654	if (!dirp)	1002	LOCK (wrklock);
655	return -1;	1003	self->dirp = dirp = opendir (req->ptr1);
656		1004	self->dbuf = u = malloc (sizeof (*u));
		1005	req->flags |= FLAG_PTR2_FREE;
657	names = malloc (memlen);	1006	req->ptr2 = names = malloc (memlen);
		1007	UNLOCK (wrklock);
		1008
		1009	if (dirp && u && names)
		1010	for (;;)
		1011	{
		1012	errno = 0;
		1013	readdir_r (dirp, &u->d, &entp);
		1014
		1015	if (!entp)
		1016	break;
		1017
		1018	name = entp->d_name;
		1019
		1020	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1021	{
		1022	int len = strlen (name) + 1;
		1023
		1024	res++;
		1025
		1026	while (memofs + len > memlen)
		1027	{
		1028	memlen *= 2;
		1029	LOCK (wrklock);
		1030	req->ptr2 = names = realloc (names, memlen);
		1031	UNLOCK (wrklock);
		1032
		1033	if (!names)
		1034	break;
		1035	}
		1036
		1037	memcpy (names + memofs, name, len);
		1038	memofs += len;
		1039	}
		1040	}
		1041
		1042	if (errno)
		1043	res = -1;
		1044
		1045	req->result = res;
		1046	}
		1047
		1048	/*****************************************************************************/
		1049
		1050	static void *aio_proc (void *thr_arg)
		1051	{
		1052	aio_req req;
		1053	struct timespec ts;
		1054	worker *self = (worker *)thr_arg;
		1055
		1056	/* try to distribute timeouts somewhat evenly */
		1057	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1058	* (1000000000UL / 1024UL);
658		1059
659	for (;;)	1060	for (;;)
660	{	1061	{
661	errno = 0, readdir_r (dirp, &u.d, &entp);	1062	ts.tv_sec = time (0) + IDLE_TIMEOUT;
662		1063
663	if (!entp)	1064	LOCK (reqlock);
664	break;
665
666	name = entp->d_name;
667
668	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
669	{
670	int len = strlen (name) + 1;
671
672	res++;
673
674	while (memofs + len > memlen)
675	{
676	memlen *= 2;
677	names = realloc (names, memlen);
678	if (!names)
679	break;
680	}
681
682	memcpy (names + memofs, name, len);
683	memofs += len;
684	}
685	}
686
687	errorno = errno;
688	closedir (dirp);
689
690	if (errorno)
691	{
692	free (names);
693	errno = errorno;
694	res = -1;
695	}
696
697	*namesp = (void *)names;
698	return res;
699	}
700
701	/*****************************************************************************/
702
703	static void *aio_proc (void *thr_arg)
704	{
705	aio_req req;
706	int type;
707
708	do
709	{
710	pthread_mutex_lock (&reqlock);
711		1065
712	for (;;)	1066	for (;;)
713	{	1067	{
714	req = reqs;	1068	self->req = req = reqq_shift (&req_queue);
715
716	if (reqs)
717	{
718	reqs = reqs->next;
719	if (!reqs) reqe = 0;
720	}
721		1069
722	if (req)	1070	if (req)
723	break;	1071	break;
724		1072
		1073	++idle;
		1074
		1075	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1076	== ETIMEDOUT)
		1077	{
		1078	if (idle > max_idle)
		1079	{
		1080	--idle;
		1081	UNLOCK (reqlock);
		1082	LOCK (wrklock);
		1083	--started;
		1084	UNLOCK (wrklock);
		1085	goto quit;
		1086	}
		1087
		1088	/* we are allowed to idle, so do so without any timeout */
725	pthread_cond_wait (&reqwait, &reqlock);	1089	pthread_cond_wait (&reqwait, &reqlock);
		1090	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1091	}
		1092
		1093	--idle;
726	}	1094	}
727		1095
728	pthread_mutex_unlock (&reqlock);	1096	--nready;
		1097
		1098	UNLOCK (reqlock);
729		1099
730	errno = 0; /* strictly unnecessary */	1100	errno = 0; /* strictly unnecessary */
731		1101
732	if (!req->cancelled)	1102	if (!(req->flags & FLAG_CANCELLED))
733	switch (req->type)	1103	switch (req->type)
734	{	1104	{
735	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1105	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
736	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1106	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
737		1107
738	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1108	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
739	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1109	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
740		1110
741	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1111	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
742	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1112	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
743	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1113	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
744		1114
745	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1115	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
746	case REQ_CLOSE: req->result = close (req->fd); break;	1116	case REQ_CLOSE: req->result = close (req->int1); break;
747	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1117	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
748	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1118	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
749	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1119	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
750	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1120	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
751	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1121	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1122	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1123	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
752		1124
753	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1125	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
754	case REQ_FSYNC: req->result = fsync (req->fd); break;	1126	case REQ_FSYNC: req->result = fsync (req->int1); break;
755	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1127	case REQ_READDIR: scandir_ (req, self); break;
756		1128
757	case REQ_SLEEP:	1129	case REQ_BUSY:
758	{	1130	{
759	struct timeval tv;	1131	struct timeval tv;
760		1132
761	tv.tv_sec = req->fd;	1133	tv.tv_sec = req->int1;
762	tv.tv_usec = req->fd2;	1134	tv.tv_usec = req->int2;
763		1135
764	req->result = select (0, 0, 0, 0, &tv);	1136	req->result = select (0, 0, 0, 0, &tv);
765	}	1137	}
766		1138
		1139	case REQ_GROUP:
		1140	case REQ_NOP:
		1141	break;
		1142
767	case REQ_QUIT:	1143	case REQ_QUIT:
768	break;	1144	goto quit;
769		1145
770	default:	1146	default:
771	req->result = ENOSYS;	1147	req->result = ENOSYS;
772	break;	1148	break;
773	}	1149	}
774		1150
775	req->errorno = errno;	1151	req->errorno = errno;
776		1152
777	pthread_mutex_lock (&reslock);	1153	LOCK (reslock);
778		1154
779	req->next = 0;	1155	++npending;
780		1156
781	if (rese)	1157	if (!reqq_push (&res_queue, req))
782	{
783	rese->next = req;
784	rese = req;
785	}
786	else
787	{
788	rese = ress = req;
789
790	/* write a dummy byte to the pipe so fh becomes ready */	1158	/* write a dummy byte to the pipe so fh becomes ready */
791	write (respipe [1], &respipe, 1);	1159	write (respipe [1], &respipe, 1);
792	}
793		1160
794	pthread_mutex_unlock (&reslock);	1161	self->req = 0;
		1162	worker_clear (self);
		1163
		1164	UNLOCK (reslock);
795	}	1165	}
796	while (type != REQ_QUIT);	1166
		1167	quit:
		1168	LOCK (wrklock);
		1169	worker_free (self);
		1170	UNLOCK (wrklock);
797		1171
798	return 0;	1172	return 0;
799	}	1173	}
800		1174
801	/*****************************************************************************/	1175	/*****************************************************************************/
802		1176
803	static void atfork_prepare (void)	1177	static void atfork_prepare (void)
804	{	1178	{
805	pthread_mutex_lock (&reqlock);	1179	LOCK (wrklock);
806	pthread_mutex_lock (&reslock);	1180	LOCK (reqlock);
		1181	LOCK (reslock);
807	#if !HAVE_PREADWRITE	1182	#if !HAVE_PREADWRITE
808	pthread_mutex_lock (&preadwritelock);	1183	LOCK (preadwritelock);
809	#endif	1184	#endif
810	#if !HAVE_READDIR_R	1185	#if !HAVE_READDIR_R
811	pthread_mutex_lock (&readdirlock);	1186	LOCK (readdirlock);
812	#endif	1187	#endif
813	}	1188	}
814		1189
815	static void atfork_parent (void)	1190	static void atfork_parent (void)
816	{	1191	{
817	#if !HAVE_READDIR_R	1192	#if !HAVE_READDIR_R
818	pthread_mutex_unlock (&readdirlock);	1193	UNLOCK (readdirlock);
819	#endif	1194	#endif
820	#if !HAVE_PREADWRITE	1195	#if !HAVE_PREADWRITE
821	pthread_mutex_unlock (&preadwritelock);	1196	UNLOCK (preadwritelock);
822	#endif	1197	#endif
823	pthread_mutex_unlock (&reslock);	1198	UNLOCK (reslock);
824	pthread_mutex_unlock (&reqlock);	1199	UNLOCK (reqlock);
		1200	UNLOCK (wrklock);
825	}	1201	}
826		1202
827	static void atfork_child (void)	1203	static void atfork_child (void)
828	{	1204	{
829	aio_req prv;	1205	aio_req prv;
830		1206
831	started = 0;	1207	while (prv = reqq_shift (&req_queue))
		1208	req_free (prv);
832		1209
833	while (reqs)	1210	while (prv = reqq_shift (&res_queue))
		1211	req_free (prv);
		1212
		1213	while (wrk_first.next != &wrk_first)
834	{	1214	{
835	prv = reqs;	1215	worker *wrk = wrk_first.next;
836	reqs = prv->next;	1216
		1217	if (wrk->req)
		1218	req_free (wrk->req);
		1219
		1220	worker_clear (wrk);
837	req_free (prv);	1221	worker_free (wrk);
838	}	1222	}
839		1223
840	reqs = reqe = 0;	1224	started = 0;
841		1225	idle = 0;
842	while (ress)	1226	nreqs = 0;
843	{	1227	nready = 0;
844	prv = ress;	1228	npending = 0;
845	ress = prv->next;
846	req_free (prv);
847	}
848
849	ress = rese = 0;
850		1229
851	close (respipe [0]);	1230	close (respipe [0]);
852	close (respipe [1]);	1231	close (respipe [1]);
853	create_pipe ();	1232	create_pipe ();
854		1233
855	atfork_parent ();	1234	atfork_parent ();
856	}	1235	}
857		1236
858	#define dREQ \	1237	#define dREQ \
859	aio_req req; \	1238	aio_req req; \
		1239	int req_pri = next_pri; \
		1240	next_pri = DEFAULT_PRI + PRI_BIAS; \
860	\	1241	\
861	if (SvOK (callback) && !SvROK (callback)) \	1242	if (SvOK (callback) && !SvROK (callback)) \
862	croak ("callback must be undef or of reference type"); \	1243	croak ("callback must be undef or of reference type"); \
863	\	1244	\
864	Newz (0, req, 1, aio_cb); \	1245	Newz (0, req, 1, aio_cb); \
865	if (!req) \	1246	if (!req) \
866	croak ("out of memory during aio_req allocation"); \	1247	croak ("out of memory during aio_req allocation"); \
867	\	1248	\
868	req->callback = newSVsv (callback)	1249	req->callback = newSVsv (callback); \
		1250	req->pri = req_pri
869		1251
870	#define REQ_SEND \	1252	#define REQ_SEND \
871	req_send (req); \	1253	req_send (req); \
872	\	1254	\
873	if (GIMME_V != G_VOID) \	1255	if (GIMME_V != G_VOID) \
…		…
878	PROTOTYPES: ENABLE	1260	PROTOTYPES: ENABLE
879		1261
880	BOOT:	1262	BOOT:
881	{	1263	{
882	HV *stash = gv_stashpv ("IO::AIO", 1);	1264	HV *stash = gv_stashpv ("IO::AIO", 1);
		1265
883	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1266	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
884	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1267	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
885	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));	1268	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1269	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1270	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1271	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
886		1272
887	create_pipe ();	1273	create_pipe ();
888	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1274	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
889	}	1275	}
890		1276
891	void	1277	void
892	min_parallel (nthreads)	1278	max_poll_reqs (int nreqs)
893	int nthreads
894	PROTOTYPE: $	1279	PROTOTYPE: $
		1280	CODE:
		1281	max_poll_reqs = nreqs;
895		1282
896	void	1283	void
897	max_parallel (nthreads)	1284	max_poll_time (double nseconds)
898	int nthreads
899	PROTOTYPE: $	1285	PROTOTYPE: $
		1286	CODE:
		1287	max_poll_time = nseconds * AIO_TICKS;
		1288
		1289	void
		1290	min_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_parallel (int nthreads)
		1295	PROTOTYPE: $
		1296
		1297	void
		1298	max_idle (int nthreads)
		1299	PROTOTYPE: $
		1300	CODE:
		1301	set_max_idle (nthreads);
900		1302
901	int	1303	int
902	max_outstanding (nreqs)	1304	max_outstanding (int maxreqs)
903	int nreqs	1305	PROTOTYPE: $
904	PROTOTYPE: $
905	CODE:	1306	CODE:
906	RETVAL = max_outstanding;	1307	RETVAL = max_outstanding;
907	max_outstanding = nreqs;	1308	max_outstanding = maxreqs;
		1309	OUTPUT:
		1310	RETVAL
908		1311
909	void	1312	void
910	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1313	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
911	SV * pathname	1314	SV * pathname
912	int flags	1315	int flags
…		…
916	PPCODE:	1319	PPCODE:
917	{	1320	{
918	dREQ;	1321	dREQ;
919		1322
920	req->type = REQ_OPEN;	1323	req->type = REQ_OPEN;
921	req->data = newSVsv (pathname);	1324	req->sv1 = newSVsv (pathname);
922	req->dataptr = SvPVbyte_nolen (req->data);	1325	req->ptr1 = SvPVbyte_nolen (pathname);
923	req->fd = flags;	1326	req->int1 = flags;
924	req->mode = mode;	1327	req->mode = mode;
925		1328
926	REQ_SEND;	1329	REQ_SEND;
927	}	1330	}
928		1331
…		…
938	PPCODE:	1341	PPCODE:
939	{	1342	{
940	dREQ;	1343	dREQ;
941		1344
942	req->type = ix;	1345	req->type = ix;
943	req->fh = newSVsv (fh);	1346	req->fh = newSVsv (fh);
944	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1347	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
945		1348
946	REQ_SEND (req);	1349	REQ_SEND (req);
947	}	1350	}
948		1351
949	void	1352	void
…		…
958	aio_read = REQ_READ	1361	aio_read = REQ_READ
959	aio_write = REQ_WRITE	1362	aio_write = REQ_WRITE
960	PROTOTYPE: $$$$$;$	1363	PROTOTYPE: $$$$$;$
961	PPCODE:	1364	PPCODE:
962	{	1365	{
963	aio_req req;
964	STRLEN svlen;	1366	STRLEN svlen;
965	char *svptr = SvPVbyte (data, svlen);	1367	char *svptr = SvPVbyte (data, svlen);
966		1368
967	SvUPGRADE (data, SVt_PV);	1369	SvUPGRADE (data, SVt_PV);
968	SvPOK_on (data);	1370	SvPOK_on (data);
…		…
990		1392
991	{	1393	{
992	dREQ;	1394	dREQ;
993		1395
994	req->type = ix;	1396	req->type = ix;
995	req->fh = newSVsv (fh);	1397	req->fh = newSVsv (fh);
996	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1398	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
997	: IoOFP (sv_2io (fh)));	1399	: IoOFP (sv_2io (fh)));
998	req->offset = offset;	1400	req->offs = offset;
999	req->length = length;	1401	req->size = length;
1000	req->data = SvREFCNT_inc (data);	1402	req->sv1 = SvREFCNT_inc (data);
1001	req->dataptr = (char *)svptr + dataoffset;	1403	req->ptr1 = (char *)svptr + dataoffset;
		1404	req->stroffset = dataoffset;
1002		1405
1003	if (!SvREADONLY (data))	1406	if (!SvREADONLY (data))
1004	{	1407	{
1005	SvREADONLY_on (data);	1408	SvREADONLY_on (data);
1006	req->data2ptr = (void *)data;	1409	req->flags |= FLAG_SV1_RO_OFF;
1007	}	1410	}
1008		1411
1009	REQ_SEND;	1412	REQ_SEND;
1010	}	1413	}
		1414	}
		1415
		1416	void
		1417	aio_readlink (path,callback=&PL_sv_undef)
		1418	SV * path
		1419	SV * callback
		1420	PROTOTYPE: $$;$
		1421	PPCODE:
		1422	{
		1423	SV *data;
		1424	dREQ;
		1425
		1426	data = newSV (NAME_MAX);
		1427	SvPOK_on (data);
		1428
		1429	req->type = REQ_READLINK;
		1430	req->fh = newSVsv (path);
		1431	req->ptr2 = SvPVbyte_nolen (path);
		1432	req->sv1 = data;
		1433	req->ptr1 = SvPVbyte_nolen (data);
		1434
		1435	REQ_SEND;
1011	}	1436	}
1012		1437
1013	void	1438	void
1014	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1439	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
1015	SV * out_fh	1440	SV * out_fh
…		…
1021	PPCODE:	1446	PPCODE:
1022	{	1447	{
1023	dREQ;	1448	dREQ;
1024		1449
1025	req->type = REQ_SENDFILE;	1450	req->type = REQ_SENDFILE;
1026	req->fh = newSVsv (out_fh);	1451	req->fh = newSVsv (out_fh);
1027	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1452	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1028	req->fh2 = newSVsv (in_fh);	1453	req->sv2 = newSVsv (in_fh);
1029	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1454	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1030	req->offset = in_offset;	1455	req->offs = in_offset;
1031	req->length = length;	1456	req->size = length;
1032		1457
1033	REQ_SEND;	1458	REQ_SEND;
1034	}	1459	}
1035		1460
1036	void	1461	void
…		…
1043	PPCODE:	1468	PPCODE:
1044	{	1469	{
1045	dREQ;	1470	dREQ;
1046		1471
1047	req->type = REQ_READAHEAD;	1472	req->type = REQ_READAHEAD;
1048	req->fh = newSVsv (fh);	1473	req->fh = newSVsv (fh);
1049	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1474	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1050	req->offset = offset;	1475	req->offs = offset;
1051	req->length = length;	1476	req->size = length;
1052		1477
1053	REQ_SEND;	1478	REQ_SEND;
1054	}	1479	}
1055		1480
1056	void	1481	void
…		…
1062	aio_lstat = REQ_LSTAT	1487	aio_lstat = REQ_LSTAT
1063	PPCODE:	1488	PPCODE:
1064	{	1489	{
1065	dREQ;	1490	dREQ;
1066		1491
1067	New (0, req->statdata, 1, Stat_t);	1492	req->ptr2 = malloc (sizeof (Stat_t));
1068	if (!req->statdata)	1493	if (!req->ptr2)
1069	{	1494	{
1070	req_free (req);	1495	req_free (req);
1071	croak ("out of memory during aio_req->statdata allocation");	1496	croak ("out of memory during aio_req statdata allocation");
1072	}	1497	}
		1498
		1499	req->flags |= FLAG_PTR2_FREE;
1073		1500
1074	if (SvPOK (fh_or_path))	1501	if (SvPOK (fh_or_path))
1075	{	1502	{
1076	req->type = ix;	1503	req->type = ix;
1077	req->data = newSVsv (fh_or_path);	1504	req->sv1 = newSVsv (fh_or_path);
1078	req->dataptr = SvPVbyte_nolen (req->data);	1505	req->ptr1 = SvPVbyte_nolen (fh_or_path);
1079	}	1506	}
1080	else	1507	else
1081	{	1508	{
1082	req->type = REQ_FSTAT;	1509	req->type = REQ_FSTAT;
1083	req->fh = newSVsv (fh_or_path);	1510	req->fh = newSVsv (fh_or_path);
1084	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1511	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1085	}	1512	}
1086		1513
1087	REQ_SEND;	1514	REQ_SEND;
1088	}	1515	}
1089		1516
1090	void	1517	void
1091	aio_unlink (pathname,callback=&PL_sv_undef)	1518	aio_unlink (pathname,callback=&PL_sv_undef)
1092	SV * pathname	1519	SV * pathname
1093	SV * callback	1520	SV * callback
1094	ALIAS:	1521	ALIAS:
1095	aio_unlink = REQ_UNLINK	1522	aio_unlink = REQ_UNLINK
1096	aio_rmdir = REQ_RMDIR	1523	aio_rmdir = REQ_RMDIR
1097	aio_readdir = REQ_READDIR	1524	aio_readdir = REQ_READDIR
1098	PPCODE:	1525	PPCODE:
1099	{	1526	{
1100	dREQ;	1527	dREQ;
1101		1528
1102	req->type = ix;	1529	req->type = ix;
1103	req->data = newSVsv (pathname);	1530	req->sv1 = newSVsv (pathname);
1104	req->dataptr = SvPVbyte_nolen (req->data);	1531	req->ptr1 = SvPVbyte_nolen (pathname);
1105		1532
1106	REQ_SEND;	1533	REQ_SEND;
1107	}	1534	}
1108		1535
1109	void	1536	void
1110	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1537	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1111	SV * oldpath	1538	SV * oldpath
1112	SV * newpath	1539	SV * newpath
1113	SV * callback	1540	SV * callback
1114	ALIAS:	1541	ALIAS:
1115	aio_link = REQ_LINK	1542	aio_link = REQ_LINK
1116	aio_symlink = REQ_SYMLINK	1543	aio_symlink = REQ_SYMLINK
1117	aio_rename = REQ_RENAME	1544	aio_rename = REQ_RENAME
1118	PPCODE:	1545	PPCODE:
1119	{	1546	{
1120	dREQ;	1547	dREQ;
1121		1548
1122	req->type = ix;	1549	req->type = ix;
1123	req->fh = newSVsv (oldpath);	1550	req->fh = newSVsv (oldpath);
1124	req->data2ptr = SvPVbyte_nolen (req->fh);	1551	req->ptr2 = SvPVbyte_nolen (req->fh);
1125	req->data = newSVsv (newpath);	1552	req->sv1 = newSVsv (newpath);
1126	req->dataptr = SvPVbyte_nolen (req->data);	1553	req->ptr1 = SvPVbyte_nolen (newpath);
1127		1554
1128	REQ_SEND;	1555	REQ_SEND;
1129	}	1556	}
1130		1557
1131	void	1558	void
1132	aio_sleep (delay,callback=&PL_sv_undef)	1559	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
1133	double delay	1560	SV * pathname
1134	SV * callback	1561	SV * callback
		1562	UV mode
		1563	UV dev
1135	PPCODE:	1564	PPCODE:
1136	{	1565	{
1137	dREQ;	1566	dREQ;
		1567
		1568	req->type = REQ_MKNOD;
		1569	req->sv1 = newSVsv (pathname);
		1570	req->ptr1 = SvPVbyte_nolen (pathname);
		1571	req->mode = (mode_t)mode;
		1572	req->offs = dev;
		1573
		1574	REQ_SEND;
		1575	}
1138		1576
		1577	void
		1578	aio_busy (delay,callback=&PL_sv_undef)
		1579	double delay
		1580	SV * callback
		1581	PPCODE:
		1582	{
		1583	dREQ;
		1584
1139	req->type = REQ_SLEEP;	1585	req->type = REQ_BUSY;
1140	req->fd = delay < 0. ? 0 : delay;	1586	req->int1 = delay < 0. ? 0 : delay;
1141	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);	1587	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
1142		1588
1143	REQ_SEND;	1589	REQ_SEND;
1144	}	1590	}
1145		1591
1146	void	1592	void
…		…
1148	SV * callback	1594	SV * callback
1149	PROTOTYPE: ;$	1595	PROTOTYPE: ;$
1150	PPCODE:	1596	PPCODE:
1151	{	1597	{
1152	dREQ;	1598	dREQ;
		1599
1153	req->type = REQ_GROUP;	1600	req->type = REQ_GROUP;
1154	req->grp_next = req;
1155	req->grp_prev = req;
1156		1601
1157	req_send (req);	1602	req_send (req);
1158	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1603	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1159	}	1604	}
		1605
		1606	void
		1607	aio_nop (callback=&PL_sv_undef)
		1608	SV * callback
		1609	PPCODE:
		1610	{
		1611	dREQ;
		1612
		1613	req->type = REQ_NOP;
		1614
		1615	REQ_SEND;
		1616	}
		1617
		1618	int
		1619	aioreq_pri (int pri = 0)
		1620	PROTOTYPE: ;$
		1621	CODE:
		1622	RETVAL = next_pri - PRI_BIAS;
		1623	if (items > 0)
		1624	{
		1625	if (pri < PRI_MIN) pri = PRI_MIN;
		1626	if (pri > PRI_MAX) pri = PRI_MAX;
		1627	next_pri = pri + PRI_BIAS;
		1628	}
		1629	OUTPUT:
		1630	RETVAL
		1631
		1632	void
		1633	aioreq_nice (int nice = 0)
		1634	CODE:
		1635	nice = next_pri - nice;
		1636	if (nice < PRI_MIN) nice = PRI_MIN;
		1637	if (nice > PRI_MAX) nice = PRI_MAX;
		1638	next_pri = nice + PRI_BIAS;
1160		1639
1161	void	1640	void
1162	flush ()	1641	flush ()
1163	PROTOTYPE:	1642	PROTOTYPE:
1164	CODE:	1643	CODE:
1165	while (nreqs)	1644	while (nreqs)
1166	{	1645	{
1167	poll_wait ();	1646	poll_wait ();
1168	poll_cb ();	1647	poll_cb (0);
1169	}	1648	}
1170		1649
1171	void	1650	void
1172	poll()	1651	poll()
1173	PROTOTYPE:	1652	PROTOTYPE:
1174	CODE:	1653	CODE:
1175	if (nreqs)	1654	if (nreqs)
1176	{	1655	{
1177	poll_wait ();	1656	poll_wait ();
1178	poll_cb ();	1657	poll_cb (0);
1179	}	1658	}
1180		1659
1181	int	1660	int
1182	poll_fileno()	1661	poll_fileno()
1183	PROTOTYPE:	1662	PROTOTYPE:
…		…
1207	CODE:	1686	CODE:
1208	RETVAL = nreqs;	1687	RETVAL = nreqs;
1209	OUTPUT:	1688	OUTPUT:
1210	RETVAL	1689	RETVAL
1211		1690
1212	MODULE = IO::AIO PACKAGE = IO::AIO::REQ	1691	int
1213		1692	nready()
1214	void
1215	cancel (aio_req_ornot req)
1216	PROTOTYPE:	1693	PROTOTYPE:
1217	CODE:	1694	CODE:
		1695	RETVAL = get_nready ();
		1696	OUTPUT:
		1697	RETVAL
		1698
		1699	int
		1700	npending()
		1701	PROTOTYPE:
		1702	CODE:
		1703	RETVAL = get_npending ();
		1704	OUTPUT:
		1705	RETVAL
		1706
		1707	int
		1708	nthreads()
		1709	PROTOTYPE:
		1710	CODE:
		1711	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1712	RETVAL = started;
		1713	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1714	OUTPUT:
		1715	RETVAL
		1716
		1717	PROTOTYPES: DISABLE
		1718
		1719	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1720
		1721	void
		1722	cancel (aio_req_ornot req)
		1723	CODE:
1218	req_cancel (req);	1724	req_cancel (req);
1219		1725
		1726	void
		1727	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1728	CODE:
		1729	SvREFCNT_dec (req->callback);
		1730	req->callback = newSVsv (callback);
		1731
1220	MODULE = IO::AIO PACKAGE = IO::AIO::GRP	1732	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1221		1733
1222	void	1734	void
1223	add (aio_req grp, ...)	1735	add (aio_req grp, ...)
1224	PROTOTYPE: $;@
1225	PPCODE:	1736	PPCODE:
1226	{	1737	{
1227	int i;	1738	int i;
		1739	aio_req req;
		1740
		1741	if (grp->int1 == 2)
		1742	croak ("cannot add requests to IO::AIO::GRP after the group finished");
1228		1743
1229	for (i = 1; i < items; ++i )	1744	for (i = 1; i < items; ++i )
1230	{	1745	{
1231	if (GIMME_V != G_VOID)	1746	if (GIMME_V != G_VOID)
1232	XPUSHs (sv_2mortal (newSVsv (ST (i))));	1747	XPUSHs (sv_2mortal (newSVsv (ST (i))));
1233		1748
1234	aio_req req = SvAIO_REQ (ST (i));	1749	req = SvAIO_REQ (ST (i));
1235		1750
1236	if (req)	1751	if (req)
1237	{	1752	{
1238	req->grp_prev = grp;	1753	++grp->size;
1239	req->grp_next = grp->grp_next;
1240	grp->grp_next->grp_prev = req;
1241	grp->grp_next = req;
1242
1243	req->grp = grp;	1754	req->grp = grp;
		1755
		1756	req->grp_prev = 0;
		1757	req->grp_next = grp->grp_first;
		1758
		1759	if (grp->grp_first)
		1760	grp->grp_first->grp_prev = req;
		1761
		1762	grp->grp_first = req;
1244	}	1763	}
1245	}	1764	}
1246	}	1765	}
1247		1766
		1767	void
		1768	cancel_subs (aio_req_ornot req)
		1769	CODE:
		1770	req_cancel_subs (req);
		1771
		1772	void
		1773	result (aio_req grp, ...)
		1774	CODE:
		1775	{
		1776	int i;
		1777	AV *av;
		1778
		1779	grp->errorno = errno;
		1780
		1781	av = newAV ();
		1782
		1783	for (i = 1; i < items; ++i )
		1784	av_push (av, newSVsv (ST (i)));
		1785
		1786	SvREFCNT_dec (grp->sv1);
		1787	grp->sv1 = (SV *)av;
		1788	}
		1789
		1790	void
		1791	errno (aio_req grp, int errorno = errno)
		1792	CODE:
		1793	grp->errorno = errorno;
		1794
		1795	void
		1796	limit (aio_req grp, int limit)
		1797	CODE:
		1798	grp->int2 = limit;
		1799	aio_grp_feed (grp);
		1800
		1801	void
		1802	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1803	CODE:
		1804	{
		1805	SvREFCNT_dec (grp->sv2);
		1806	grp->sv2 = newSVsv (callback);
		1807
		1808	if (grp->int2 <= 0)
		1809	grp->int2 = 2;
		1810
		1811	aio_grp_feed (grp);
		1812	}
		1813

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