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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.45 by root, Sun Oct 22 00:19:05 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	typedef aio_cb *aio_group;
94		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
95	static int started, wanted;	165	static unsigned int started, idle, wanted;
96	static volatile int nreqs;	166
97	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;
98	static int respipe [2];	219	static int respipe [2];
99		220
100	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
101	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
102	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
103		224
104	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
105	static volatile aio_req ress, rese; /* queue start, queue end */
106		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);
107	static void req_free (aio_req req);	324	static void req_free (aio_req req);
		325	static void req_cancel (aio_req req);
108		326
109	/* must be called at most once */	327	/* must be called at most once */
110	static SV *req_sv (aio_req req, const char *klass)	328	static SV *req_sv (aio_req req, const char *klass)
111	{	329	{
		330	if (!req->self)
		331	{
112	req->self = (SV *)newHV ();	332	req->self = (SV *)newHV ();
113	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
114		335
115	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)));
116	}	337	}
117		338
118	static aio_req SvAIO_REQ (SV *sv)	339	static aio_req SvAIO_REQ (SV *sv)
119	{	340	{
		341	MAGIC *mg;
		342
120	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))	343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
121	croak ("object of class " AIO_REQ_KLASS " expected");	344	croak ("object of class " AIO_REQ_KLASS " expected");
122		345
123	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
124		347
125	return mg ? (aio_req)mg->mg_ptr : 0;	348	return mg ? (aio_req)mg->mg_ptr : 0;
126	}	349	}
127		350
128	static void poll_wait ()	351	static void aio_grp_feed (aio_req grp)
129	{	352	{
130	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	}
131	{	379	}
132	fd_set rfd;	380	}
133	FD_ZERO(&rfd);
134	FD_SET(respipe [0], &rfd);
135		381
136	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);
137	}	394	}
138	}	395	}
139		396
140	static void req_invoke (aio_req req)	397	static void req_invoke (aio_req req)
141	{	398	{
142	dSP;	399	dSP;
143	int errorno = errno;
144		400
145	if (req->cancelled || !SvOK (req->callback))	401	if (req->flags & FLAG_DATA_RO_OFF)
146	return;	402	SvREADONLY_off (req->sv1);
147		403
148	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	}
149		410
		411	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		412	{
150	ENTER;	413	ENTER;
		414	SAVETMPS;
151	PUSHMARK (SP);	415	PUSHMARK (SP);
		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	XPUSHs (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	XPUSHs (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_SLEEP:
198	case REQ_GROUP:
199	break;
200
201	default:
202	XPUSHs (sv_2mortal (newSViv (req->result)));
203	break;
204	}
205
206
207	PUTBACK;
208	call_sv (req->callback, G_VOID | G_EVAL);	503	call_sv (req->callback, G_VOID | G_EVAL);
209	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	}
210		523
211	if (SvTRUE (ERRSV))	524	if (SvTRUE (ERRSV))
212	{	525	{
213	req_free (req);	526	req_free (req);
214	croak (0);	527	croak (0);
215	}	528	}
216
217	LEAVE;
218
219	errno = errorno;
220	}	529	}
221		530
222	static void req_free (aio_req req)	531	static void req_free (aio_req req)
223	{	532	{
224	if (req->grp)
225	{
226	aio_req grp = req->grp;
227
228	/* unlink request */
229	req->grp_next->grp_prev = req->grp_prev;
230	req->grp_prev->grp_next = req->grp_next;
231
232	if (grp->grp_next == grp)
233	{
234	req_invoke (grp);
235	req_free (grp);
236	}
237	}
238
239	if (req->self)	533	if (req->self)
240	{	534	{
241	sv_unmagic (req->self, PERL_MAGIC_ext);	535	sv_unmagic (req->self, PERL_MAGIC_ext);
242	SvREFCNT_dec (req->self);	536	SvREFCNT_dec (req->self);
243	}	537	}
244		538
245	if (req->data)
246	SvREFCNT_dec (req->data);
247
248	if (req->fh)
249	SvREFCNT_dec (req->fh);	539	SvREFCNT_dec (req->fh);
250		540	SvREFCNT_dec (req->sv1);
251	if (req->fh2)
252	SvREFCNT_dec (req->fh2);	541	SvREFCNT_dec (req->sv2);
253
254	if (req->statdata)
255	Safefree (req->statdata);
256
257	if (req->callback)
258	SvREFCNT_dec (req->callback);	542	SvREFCNT_dec (req->callback);
		543	Safefree (req->statdata);
259		544
260	if (req->type == REQ_READDIR && req->result >= 0)	545	if (req->type == REQ_READDIR)
261	free (req->data2ptr);	546	free (req->ptr2);
262		547
263	Safefree (req);	548	Safefree (req);
264	}	549	}
265		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
266	static void req_cancel (aio_req req)	565	static void req_cancel (aio_req req)
267	{	566	{
268	req->cancelled = 1;	567	req->flags |= FLAG_CANCELLED;
269		568
270	if (req->type == REQ_GROUP)	569	req_cancel_subs (req);
271	{
272	aio_req sub;
273
274	for (sub = req->grp_next; sub != req; sub = sub->grp_next)
275	req_cancel (sub);
276	}
277	}
278
279	static int poll_cb ()
280	{
281	dSP;
282	int count = 0;
283	int do_croak = 0;
284	aio_req req;
285
286	for (;;)
287	{
288	pthread_mutex_lock (&reslock);
289	req = ress;
290
291	if (req)
292	{
293	ress = req->next;
294
295	if (!ress)
296	{
297	/* read any signals sent by the worker threads */
298	char buf [32];
299	while (read (respipe [0], buf, 32) == 32)
300	;
301
302	rese = 0;
303	}
304	}
305
306	pthread_mutex_unlock (&reslock);
307
308	if (!req)
309	break;
310
311	nreqs--;
312
313	if (req->type == REQ_QUIT)
314	started--;
315	else if (req->type == REQ_GROUP && req->grp_next != req)
316	continue;
317	else
318	{
319	if (req->type == REQ_READ)
320	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
321
322	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
323	SvREADONLY_off (req->data);
324
325	if (req->statdata)
326	{
327	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
328	PL_laststatval = req->result;
329	PL_statcache = *(req->statdata);
330	}
331
332	req_invoke (req);
333
334	count++;
335	}
336
337	req_free (req);
338	}
339
340	return count;
341	}	570	}
342		571
343	static void *aio_proc(void *arg);	572	static void *aio_proc(void *arg);
344		573
345	static void start_thread (void)	574	static void start_thread (void)
346	{	575	{
347	sigset_t fullsigset, oldsigset;	576	sigset_t fullsigset, oldsigset;
348	pthread_t tid;
349	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");
350		583
351	pthread_attr_init (&attr);	584	pthread_attr_init (&attr);
352	pthread_attr_setstacksize (&attr, STACKSIZE);	585	pthread_attr_setstacksize (&attr, STACKSIZE);
353	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
354		590
355	sigfillset (&fullsigset);	591	sigfillset (&fullsigset);
		592
		593	LOCK (wrklock);
356	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	594	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
357		595
358	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;
359	started++;	602	++started;
		603	}
		604	else
		605	free (wrk);
360		606
361	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 ();
362	}	621	}
363		622
364	static void req_send (aio_req req)	623	static void req_send (aio_req req)
365	{	624	{
366	while (started < wanted && nreqs >= started)
367	start_thread ();
368
369	nreqs++;	625	++nreqs;
370		626
371	pthread_mutex_lock (&reqlock);	627	LOCK (reqlock);
372		628	++nready;
373	req->next = 0;	629	reqq_push (&req_queue, req);
374
375	if (reqe)
376	{
377	reqe->next = req;
378	reqe = req;
379	}
380	else
381	reqe = reqs = req;
382
383	pthread_cond_signal (&reqwait);	630	pthread_cond_signal (&reqwait);
384	pthread_mutex_unlock (&reqlock);	631	UNLOCK (reqlock);
385		632
386	if (nreqs > max_outstanding)	633	maybe_start_thread ();
387	for (;;)
388	{
389	poll_cb ();
390
391	if (nreqs <= max_outstanding)
392	break;
393
394	poll_wait ();
395	}
396	}	634	}
397		635
398	static void end_thread (void)	636	static void end_thread (void)
399	{	637	{
400	aio_req req;	638	aio_req req;
		639
401	Newz (0, req, 1, aio_cb);	640	Newz (0, req, 1, aio_cb);
		641
402	req->type = REQ_QUIT;	642	req->type = REQ_QUIT;
		643	req->pri = PRI_MAX + PRI_BIAS;
403		644
404	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);
405	}	660	}
406		661
407	static void min_parallel (int nthreads)	662	static void min_parallel (int nthreads)
408	{	663	{
409	if (wanted < nthreads)	664	if (wanted < nthreads)
410	wanted = nthreads;	665	wanted = nthreads;
411	}	666	}
412		667
413	static void max_parallel (int nthreads)	668	static void max_parallel (int nthreads)
414	{	669	{
415	int cur = started;
416
417	if (wanted > nthreads)	670	if (wanted > nthreads)
418	wanted = nthreads;	671	wanted = nthreads;
419		672
420	while (cur > wanted)
421	{
422	end_thread ();
423	cur--;
424	}
425
426	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);
427	{	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
428	poll_wait ();	770	poll_wait ();
429	poll_cb ();	771
		772	++maxreqs;
430	}	773	}
		774
		775	return count;
431	}	776	}
432		777
433	static void create_pipe ()	778	static void create_pipe ()
434	{	779	{
435	if (pipe (respipe))	780	if (pipe (respipe))
…		…
459	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)
460	{	805	{
461	ssize_t res;	806	ssize_t res;
462	off_t ooffset;	807	off_t ooffset;
463		808
464	pthread_mutex_lock (&preadwritelock);	809	LOCK (preadwritelock);
465	ooffset = lseek (fd, 0, SEEK_CUR);	810	ooffset = lseek (fd, 0, SEEK_CUR);
466	lseek (fd, offset, SEEK_SET);	811	lseek (fd, offset, SEEK_SET);
467	res = read (fd, buf, count);	812	res = read (fd, buf, count);
468	lseek (fd, ooffset, SEEK_SET);	813	lseek (fd, ooffset, SEEK_SET);
469	pthread_mutex_unlock (&preadwritelock);	814	UNLOCK (preadwritelock);
470		815
471	return res;	816	return res;
472	}	817	}
473		818
474	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)
475	{	820	{
476	ssize_t res;	821	ssize_t res;
477	off_t ooffset;	822	off_t ooffset;
478		823
479	pthread_mutex_lock (&preadwritelock);	824	LOCK (preadwritelock);
480	ooffset = lseek (fd, 0, SEEK_CUR);	825	ooffset = lseek (fd, 0, SEEK_CUR);
481	lseek (fd, offset, SEEK_SET);	826	lseek (fd, offset, SEEK_SET);
482	res = write (fd, buf, count);	827	res = write (fd, buf, count);
483	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
484	pthread_mutex_unlock (&preadwritelock);	829	UNLOCK (preadwritelock);
485		830
486	return res;	831	return res;
487	}	832	}
488	#endif	833	#endif
489		834
490	#if !HAVE_FDATASYNC	835	#if !HAVE_FDATASYNC
491	# define fdatasync fsync	836	# define fdatasync fsync
492	#endif	837	#endif
493		838
494	#if !HAVE_READAHEAD	839	#if !HAVE_READAHEAD
495	# define readahead aio_readahead	840	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
496		841
497	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)
498	{	843	{
499	char readahead_buf[4096];	844	dBUF;
500		845
501	while (count > 0)	846	while (count > 0)
502	{	847	{
503	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	848	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
504		849
505	pread (fd, readahead_buf, len, offset);	850	pread (fd, aio_buf, len, offset);
506	offset += len;	851	offset += len;
507	count -= len;	852	count -= len;
508	}	853	}
509		854
510	errno = 0;	855	errno = 0;
511	}	856	}
		857
512	#endif	858	#endif
513		859
514	#if !HAVE_READDIR_R	860	#if !HAVE_READDIR_R
515	# define readdir_r aio_readdir_r	861	# define readdir_r aio_readdir_r
516		862
…		…
519	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)
520	{	866	{
521	struct dirent *e;	867	struct dirent *e;
522	int errorno;	868	int errorno;
523		869
524	pthread_mutex_lock (&readdirlock);	870	LOCK (readdirlock);
525		871
526	e = readdir (dirp);	872	e = readdir (dirp);
527	errorno = errno;	873	errorno = errno;
528		874
529	if (e)	875	if (e)
…		…
532	strcpy (ent->d_name, e->d_name);	878	strcpy (ent->d_name, e->d_name);
533	}	879	}
534	else	880	else
535	*res = 0;	881	*res = 0;
536		882
537	pthread_mutex_unlock (&readdirlock);	883	UNLOCK (readdirlock);
538		884
539	errno = errorno;	885	errno = errorno;
540	return e ? 0 : -1;	886	return e ? 0 : -1;
541	}	887	}
542	#endif	888	#endif
543		889
544	/* sendfile always needs emulation */	890	/* sendfile always needs emulation */
545	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)
546	{	892	{
547	ssize_t res;	893	ssize_t res;
548		894
549	if (!count)	895	if (!count)
550	return 0;	896	return 0;
…		…
561	{	907	{
562	off_t sbytes;	908	off_t sbytes;
563	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	909	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
564		910
565	if (res < 0 && sbytes)	911	if (res < 0 && sbytes)
566	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	912	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
567	res = sbytes;	913	res = sbytes;
568	}	914	}
569		915
570	# elif __hpux	916	# elif __hpux
571	res = sendfile (ofd, ifd, offset, count, 0, 0);	917	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
599	#endif	945	#endif
600	)	946	)
601	)	947	)
602	{	948	{
603	/* emulate sendfile. this is a major pain in the ass */	949	/* emulate sendfile. this is a major pain in the ass */
604	char buf[4096];	950	dBUF;
		951
605	res = 0;	952	res = 0;
606		953
607	while (count)	954	while (count)
608	{	955	{
609	ssize_t cnt;	956	ssize_t cnt;
610		957
611	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	958	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
612		959
613	if (cnt <= 0)	960	if (cnt <= 0)
614	{	961	{
615	if (cnt && !res) res = -1;	962	if (cnt && !res) res = -1;
616	break;	963	break;
617	}	964	}
618		965
619	cnt = write (ofd, buf, cnt);	966	cnt = write (ofd, aio_buf, cnt);
620		967
621	if (cnt <= 0)	968	if (cnt <= 0)
622	{	969	{
623	if (cnt && !res) res = -1;	970	if (cnt && !res) res = -1;
624	break;	971	break;
…		…
632		979
633	return res;	980	return res;
634	}	981	}
635		982
636	/* read a full directory */	983	/* read a full directory */
637	static int scandir_ (const char *path, void **namesp)	984	static void scandir_ (aio_req req, worker *self)
638	{	985	{
639	DIR *dirp = opendir (path);	986	DIR *dirp;
640	union	987	union
641	{	988	{
642	struct dirent d;	989	struct dirent d;
643	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	990	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
644	} u;	991	} *u;
645	struct dirent *entp;	992	struct dirent *entp;
646	char *name, *names;	993	char *name, *names;
647	int memlen = 4096;	994	int memlen = 4096;
648	int memofs = 0;	995	int memofs = 0;
649	int res = 0;	996	int res = 0;
650	int errorno;	997	int errorno;
651		998
652	if (!dirp)	999	LOCK (wrklock);
653	return -1;	1000	self->dirp = dirp = opendir (req->ptr1);
654		1001	self->dbuf = u = malloc (sizeof (*u));
655	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);
656		1055
657	for (;;)	1056	for (;;)
658	{	1057	{
659	errno = 0, readdir_r (dirp, &u.d, &entp);	1058	ts.tv_sec = time (0) + IDLE_TIMEOUT;
660		1059
661	if (!entp)	1060	LOCK (reqlock);
662	break;
663
664	name = entp->d_name;
665
666	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
667	{
668	int len = strlen (name) + 1;
669
670	res++;
671
672	while (memofs + len > memlen)
673	{
674	memlen *= 2;
675	names = realloc (names, memlen);
676	if (!names)
677	break;
678	}
679
680	memcpy (names + memofs, name, len);
681	memofs += len;
682	}
683	}
684
685	errorno = errno;
686	closedir (dirp);
687
688	if (errorno)
689	{
690	free (names);
691	errno = errorno;
692	res = -1;
693	}
694
695	*namesp = (void *)names;
696	return res;
697	}
698
699	/*****************************************************************************/
700
701	static void *aio_proc (void *thr_arg)
702	{
703	aio_req req;
704	int type;
705
706	do
707	{
708	pthread_mutex_lock (&reqlock);
709		1061
710	for (;;)	1062	for (;;)
711	{	1063	{
712	req = reqs;	1064	self->req = req = reqq_shift (&req_queue);
713
714	if (reqs)
715	{
716	reqs = reqs->next;
717	if (!reqs) reqe = 0;
718	}
719		1065
720	if (req)	1066	if (req)
721	break;	1067	break;
722		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 */
723	pthread_cond_wait (&reqwait, &reqlock);	1085	pthread_cond_wait (&reqwait, &reqlock);
		1086	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1087	}
		1088
		1089	--idle;
724	}	1090	}
725		1091
726	pthread_mutex_unlock (&reqlock);	1092	--nready;
		1093
		1094	UNLOCK (reqlock);
727		1095
728	errno = 0; /* strictly unnecessary */	1096	errno = 0; /* strictly unnecessary */
729		1097
730	if (!req->cancelled)	1098	if (!(req->flags & FLAG_CANCELLED))
731	switch (req->type)	1099	switch (req->type)
732	{	1100	{
733	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;
734	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;
735		1103
736	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;
737	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;
738		1106
739	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1107	case REQ_STAT: req->result = stat (req->ptr1, req->statdata); break;
740	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1108	case REQ_LSTAT: req->result = lstat (req->ptr1, req->statdata); break;
741	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1109	case REQ_FSTAT: req->result = fstat (req->int1, req->statdata); break;
742		1110
743	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;
744	case REQ_CLOSE: req->result = close (req->fd); break;	1112	case REQ_CLOSE: req->result = close (req->int1); break;
745	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1113	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
746	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1114	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
747	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1115	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
748	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1116	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
749	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;
750		1120
751	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1121	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
752	case REQ_FSYNC: req->result = fsync (req->fd); break;	1122	case REQ_FSYNC: req->result = fsync (req->int1); break;
753	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1123	case REQ_READDIR: scandir_ (req, self); break;
754		1124
755	case REQ_SLEEP:	1125	case REQ_BUSY:
756	{	1126	{
757	struct timeval tv;	1127	struct timeval tv;
758		1128
759	tv.tv_sec = req->fd;	1129	tv.tv_sec = req->int1;
760	tv.tv_usec = req->fd2;	1130	tv.tv_usec = req->int2;
761		1131
762	req->result = select (0, 0, 0, 0, &tv);	1132	req->result = select (0, 0, 0, 0, &tv);
763	}	1133	}
764		1134
		1135	case REQ_GROUP:
		1136	case REQ_NOP:
		1137	break;
		1138
765	case REQ_QUIT:	1139	case REQ_QUIT:
766	break;	1140	goto quit;
767		1141
768	default:	1142	default:
769	req->result = ENOSYS;	1143	req->result = ENOSYS;
770	break;	1144	break;
771	}	1145	}
772		1146
773	req->errorno = errno;	1147	req->errorno = errno;
774		1148
775	pthread_mutex_lock (&reslock);	1149	LOCK (reslock);
776		1150
777	req->next = 0;	1151	++npending;
778		1152
779	if (rese)	1153	if (!reqq_push (&res_queue, req))
780	{
781	rese->next = req;
782	rese = req;
783	}
784	else
785	{
786	rese = ress = req;
787
788	/* write a dummy byte to the pipe so fh becomes ready */	1154	/* write a dummy byte to the pipe so fh becomes ready */
789	write (respipe [1], &respipe, 1);	1155	write (respipe [1], &respipe, 1);
790	}
791		1156
792	pthread_mutex_unlock (&reslock);	1157	self->req = 0;
		1158	worker_clear (self);
		1159
		1160	UNLOCK (reslock);
793	}	1161	}
794	while (type != REQ_QUIT);	1162
		1163	quit:
		1164	LOCK (wrklock);
		1165	worker_free (self);
		1166	UNLOCK (wrklock);
795		1167
796	return 0;	1168	return 0;
797	}	1169	}
798		1170
799	/*****************************************************************************/	1171	/*****************************************************************************/
800		1172
801	static void atfork_prepare (void)	1173	static void atfork_prepare (void)
802	{	1174	{
803	pthread_mutex_lock (&reqlock);	1175	LOCK (wrklock);
804	pthread_mutex_lock (&reslock);	1176	LOCK (reqlock);
		1177	LOCK (reslock);
805	#if !HAVE_PREADWRITE	1178	#if !HAVE_PREADWRITE
806	pthread_mutex_lock (&preadwritelock);	1179	LOCK (preadwritelock);
807	#endif	1180	#endif
808	#if !HAVE_READDIR_R	1181	#if !HAVE_READDIR_R
809	pthread_mutex_lock (&readdirlock);	1182	LOCK (readdirlock);
810	#endif	1183	#endif
811	}	1184	}
812		1185
813	static void atfork_parent (void)	1186	static void atfork_parent (void)
814	{	1187	{
815	#if !HAVE_READDIR_R	1188	#if !HAVE_READDIR_R
816	pthread_mutex_unlock (&readdirlock);	1189	UNLOCK (readdirlock);
817	#endif	1190	#endif
818	#if !HAVE_PREADWRITE	1191	#if !HAVE_PREADWRITE
819	pthread_mutex_unlock (&preadwritelock);	1192	UNLOCK (preadwritelock);
820	#endif	1193	#endif
821	pthread_mutex_unlock (&reslock);	1194	UNLOCK (reslock);
822	pthread_mutex_unlock (&reqlock);	1195	UNLOCK (reqlock);
		1196	UNLOCK (wrklock);
823	}	1197	}
824		1198
825	static void atfork_child (void)	1199	static void atfork_child (void)
826	{	1200	{
827	aio_req prv;	1201	aio_req prv;
828		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
829	started = 0;	1220	started = 0;
830		1221	idle = 0;
831	while (reqs)	1222	nreqs = 0;
832	{	1223	nready = 0;
833	prv = reqs;	1224	npending = 0;
834	reqs = prv->next;
835	req_free (prv);
836	}
837
838	reqs = reqe = 0;
839
840	while (ress)
841	{
842	prv = ress;
843	ress = prv->next;
844	req_free (prv);
845	}
846
847	ress = rese = 0;
848		1225
849	close (respipe [0]);	1226	close (respipe [0]);
850	close (respipe [1]);	1227	close (respipe [1]);
851	create_pipe ();	1228	create_pipe ();
852		1229
853	atfork_parent ();	1230	atfork_parent ();
854	}	1231	}
855		1232
856	#define dREQ \	1233	#define dREQ \
857	aio_req req; \	1234	aio_req req; \
		1235	int req_pri = next_pri; \
		1236	next_pri = DEFAULT_PRI + PRI_BIAS; \
858	\	1237	\
859	if (SvOK (callback) && !SvROK (callback)) \	1238	if (SvOK (callback) && !SvROK (callback)) \
860	croak ("callback must be undef or of reference type"); \	1239	croak ("callback must be undef or of reference type"); \
861	\	1240	\
862	Newz (0, req, 1, aio_cb); \	1241	Newz (0, req, 1, aio_cb); \
863	if (!req) \	1242	if (!req) \
864	croak ("out of memory during aio_req allocation"); \	1243	croak ("out of memory during aio_req allocation"); \
865	\	1244	\
866	req->callback = newSVsv (callback)	1245	req->callback = newSVsv (callback); \
		1246	req->pri = req_pri
867		1247
868	#define REQ_SEND \	1248	#define REQ_SEND \
869	req_send (req); \	1249	req_send (req); \
870	\	1250	\
871	if (GIMME_V != G_VOID) \	1251	if (GIMME_V != G_VOID) \
…		…
876	PROTOTYPES: ENABLE	1256	PROTOTYPES: ENABLE
877		1257
878	BOOT:	1258	BOOT:
879	{	1259	{
880	HV *stash = gv_stashpv ("IO::AIO", 1);	1260	HV *stash = gv_stashpv ("IO::AIO", 1);
		1261
881	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1262	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
882	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1263	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
883	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));
884		1268
885	create_pipe ();	1269	create_pipe ();
886	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1270	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
887	}	1271	}
888		1272
889	void	1273	void
890	min_parallel (nthreads)	1274	max_poll_reqs (int nreqs)
891	int nthreads
892	PROTOTYPE: $	1275	PROTOTYPE: $
		1276	CODE:
		1277	max_poll_reqs = nreqs;
893		1278
894	void	1279	void
895	max_parallel (nthreads)	1280	max_poll_time (double nseconds)
896	int nthreads
897	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);
898		1298
899	int	1299	int
900	max_outstanding (nreqs)	1300	max_outstanding (int maxreqs)
901	int nreqs	1301	PROTOTYPE: $
902	PROTOTYPE: $
903	CODE:	1302	CODE:
904	RETVAL = max_outstanding;	1303	RETVAL = max_outstanding;
905	max_outstanding = nreqs;	1304	max_outstanding = maxreqs;
		1305	OUTPUT:
		1306	RETVAL
906		1307
907	void	1308	void
908	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1309	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
909	SV * pathname	1310	SV * pathname
910	int flags	1311	int flags
…		…
914	PPCODE:	1315	PPCODE:
915	{	1316	{
916	dREQ;	1317	dREQ;
917		1318
918	req->type = REQ_OPEN;	1319	req->type = REQ_OPEN;
919	req->data = newSVsv (pathname);	1320	req->sv1 = newSVsv (pathname);
920	req->dataptr = SvPVbyte_nolen (req->data);	1321	req->ptr1 = SvPVbyte_nolen (pathname);
921	req->fd = flags;	1322	req->int1 = flags;
922	req->mode = mode;	1323	req->mode = mode;
923		1324
924	REQ_SEND;	1325	REQ_SEND;
925	}	1326	}
926		1327
…		…
936	PPCODE:	1337	PPCODE:
937	{	1338	{
938	dREQ;	1339	dREQ;
939		1340
940	req->type = ix;	1341	req->type = ix;
941	req->fh = newSVsv (fh);	1342	req->fh = newSVsv (fh);
942	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1343	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
943		1344
944	REQ_SEND (req);	1345	REQ_SEND (req);
945	}	1346	}
946		1347
947	void	1348	void
…		…
956	aio_read = REQ_READ	1357	aio_read = REQ_READ
957	aio_write = REQ_WRITE	1358	aio_write = REQ_WRITE
958	PROTOTYPE: $$$$$;$	1359	PROTOTYPE: $$$$$;$
959	PPCODE:	1360	PPCODE:
960	{	1361	{
961	aio_req req;
962	STRLEN svlen;	1362	STRLEN svlen;
963	char *svptr = SvPVbyte (data, svlen);	1363	char *svptr = SvPVbyte (data, svlen);
964		1364
965	SvUPGRADE (data, SVt_PV);	1365	SvUPGRADE (data, SVt_PV);
966	SvPOK_on (data);	1366	SvPOK_on (data);
…		…
988		1388
989	{	1389	{
990	dREQ;	1390	dREQ;
991		1391
992	req->type = ix;	1392	req->type = ix;
993	req->fh = newSVsv (fh);	1393	req->fh = newSVsv (fh);
994	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1394	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
995	: IoOFP (sv_2io (fh)));	1395	: IoOFP (sv_2io (fh)));
996	req->offset = offset;	1396	req->offs = offset;
997	req->length = length;	1397	req->size = length;
998	req->data = SvREFCNT_inc (data);	1398	req->sv1 = SvREFCNT_inc (data);
999	req->dataptr = (char *)svptr + dataoffset;	1399	req->ptr1 = (char *)svptr + dataoffset;
		1400	req->stroffset = dataoffset;
1000		1401
1001	if (!SvREADONLY (data))	1402	if (!SvREADONLY (data))
1002	{	1403	{
1003	SvREADONLY_on (data);	1404	SvREADONLY_on (data);
1004	req->data2ptr = (void *)data;	1405	req->flags |= FLAG_DATA_RO_OFF;
1005	}	1406	}
1006		1407
1007	REQ_SEND;	1408	REQ_SEND;
1008	}	1409	}
		1410	}
		1411
		1412	void
		1413	aio_readlink (path,callback=&PL_sv_undef)
		1414	SV * path
		1415	SV * callback
		1416	PROTOTYPE: $$;$
		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;
1009	}	1432	}
1010		1433
1011	void	1434	void
1012	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)
1013	SV * out_fh	1436	SV * out_fh
…		…
1019	PPCODE:	1442	PPCODE:
1020	{	1443	{
1021	dREQ;	1444	dREQ;
1022		1445
1023	req->type = REQ_SENDFILE;	1446	req->type = REQ_SENDFILE;
1024	req->fh = newSVsv (out_fh);	1447	req->fh = newSVsv (out_fh);
1025	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1026	req->fh2 = newSVsv (in_fh);	1449	req->sv2 = newSVsv (in_fh);
1027	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1450	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1028	req->offset = in_offset;	1451	req->offs = in_offset;
1029	req->length = length;	1452	req->size = length;
1030		1453
1031	REQ_SEND;	1454	REQ_SEND;
1032	}	1455	}
1033		1456
1034	void	1457	void
…		…
1041	PPCODE:	1464	PPCODE:
1042	{	1465	{
1043	dREQ;	1466	dREQ;
1044		1467
1045	req->type = REQ_READAHEAD;	1468	req->type = REQ_READAHEAD;
1046	req->fh = newSVsv (fh);	1469	req->fh = newSVsv (fh);
1047	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1470	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1048	req->offset = offset;	1471	req->offs = offset;
1049	req->length = length;	1472	req->size = length;
1050		1473
1051	REQ_SEND;	1474	REQ_SEND;
1052	}	1475	}
1053		1476
1054	void	1477	void
…		…
1070	}	1493	}
1071		1494
1072	if (SvPOK (fh_or_path))	1495	if (SvPOK (fh_or_path))
1073	{	1496	{
1074	req->type = ix;	1497	req->type = ix;
1075	req->data = newSVsv (fh_or_path);	1498	req->sv1 = newSVsv (fh_or_path);
1076	req->dataptr = SvPVbyte_nolen (req->data);	1499	req->ptr1 = SvPVbyte_nolen (fh_or_path);
1077	}	1500	}
1078	else	1501	else
1079	{	1502	{
1080	req->type = REQ_FSTAT;	1503	req->type = REQ_FSTAT;
1081	req->fh = newSVsv (fh_or_path);	1504	req->fh = newSVsv (fh_or_path);
1082	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1505	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1083	}	1506	}
1084		1507
1085	REQ_SEND;	1508	REQ_SEND;
1086	}	1509	}
1087		1510
1088	void	1511	void
1089	aio_unlink (pathname,callback=&PL_sv_undef)	1512	aio_unlink (pathname,callback=&PL_sv_undef)
1090	SV * pathname	1513	SV * pathname
1091	SV * callback	1514	SV * callback
1092	ALIAS:	1515	ALIAS:
1093	aio_unlink = REQ_UNLINK	1516	aio_unlink = REQ_UNLINK
1094	aio_rmdir = REQ_RMDIR	1517	aio_rmdir = REQ_RMDIR
1095	aio_readdir = REQ_READDIR	1518	aio_readdir = REQ_READDIR
1096	PPCODE:	1519	PPCODE:
1097	{	1520	{
1098	dREQ;	1521	dREQ;
1099		1522
1100	req->type = ix;	1523	req->type = ix;
1101	req->data = newSVsv (pathname);	1524	req->sv1 = newSVsv (pathname);
1102	req->dataptr = SvPVbyte_nolen (req->data);	1525	req->ptr1 = SvPVbyte_nolen (pathname);
1103		1526
1104	REQ_SEND;	1527	REQ_SEND;
1105	}	1528	}
1106		1529
1107	void	1530	void
1108	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1531	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1109	SV * oldpath	1532	SV * oldpath
1110	SV * newpath	1533	SV * newpath
1111	SV * callback	1534	SV * callback
1112	ALIAS:	1535	ALIAS:
1113	aio_link = REQ_LINK	1536	aio_link = REQ_LINK
1114	aio_symlink = REQ_SYMLINK	1537	aio_symlink = REQ_SYMLINK
1115	aio_rename = REQ_RENAME	1538	aio_rename = REQ_RENAME
1116	PPCODE:	1539	PPCODE:
1117	{	1540	{
1118	dREQ;	1541	dREQ;
1119		1542
1120	req->type = ix;	1543	req->type = ix;
1121	req->fh = newSVsv (oldpath);	1544	req->fh = newSVsv (oldpath);
1122	req->data2ptr = SvPVbyte_nolen (req->fh);	1545	req->ptr2 = SvPVbyte_nolen (req->fh);
1123	req->data = newSVsv (newpath);	1546	req->sv1 = newSVsv (newpath);
1124	req->dataptr = SvPVbyte_nolen (req->data);	1547	req->ptr1 = SvPVbyte_nolen (newpath);
1125		1548
1126	REQ_SEND;	1549	REQ_SEND;
1127	}	1550	}
1128		1551
1129	void	1552	void
1130	aio_sleep (delay,callback=&PL_sv_undef)	1553	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
1131	double delay	1554	SV * pathname
1132	SV * callback	1555	SV * callback
		1556	UV mode
		1557	UV dev
1133	PPCODE:	1558	PPCODE:
1134	{	1559	{
1135	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	}
1136		1570
		1571	void
		1572	aio_busy (delay,callback=&PL_sv_undef)
		1573	double delay
		1574	SV * callback
		1575	PPCODE:
		1576	{
		1577	dREQ;
		1578
1137	req->type = REQ_SLEEP;	1579	req->type = REQ_BUSY;
1138	req->fd = delay < 0. ? 0 : delay;	1580	req->int1 = delay < 0. ? 0 : delay;
1139	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);	1581	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
1140		1582
1141	REQ_SEND;	1583	REQ_SEND;
1142	}	1584	}
1143		1585
1144	void	1586	void
1145	aio_group (callback=&PL_sv_undef)	1587	aio_group (callback=&PL_sv_undef)
1146	SV * callback	1588	SV * callback
1147	PROTOTYPE: ;&	1589	PROTOTYPE: ;$
1148	PPCODE:	1590	PPCODE:
1149	{	1591	{
1150	dREQ;	1592	dREQ;
		1593
1151	req->type = REQ_GROUP;	1594	req->type = REQ_GROUP;
1152	req->grp_next = req;
1153	req->grp_prev = req;
1154		1595
1155	req_send (req);	1596	req_send (req);
1156	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1597	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1157	}	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;
1158		1633
1159	void	1634	void
1160	flush ()	1635	flush ()
1161	PROTOTYPE:	1636	PROTOTYPE:
1162	CODE:	1637	CODE:
1163	while (nreqs)	1638	while (nreqs)
1164	{	1639	{
1165	poll_wait ();	1640	poll_wait ();
1166	poll_cb ();	1641	poll_cb (0);
1167	}	1642	}
1168		1643
1169	void	1644	void
1170	poll()	1645	poll()
1171	PROTOTYPE:	1646	PROTOTYPE:
1172	CODE:	1647	CODE:
1173	if (nreqs)	1648	if (nreqs)
1174	{	1649	{
1175	poll_wait ();	1650	poll_wait ();
1176	poll_cb ();	1651	poll_cb (0);
1177	}	1652	}
1178		1653
1179	int	1654	int
1180	poll_fileno()	1655	poll_fileno()
1181	PROTOTYPE:	1656	PROTOTYPE:
…		…
1205	CODE:	1680	CODE:
1206	RETVAL = nreqs;	1681	RETVAL = nreqs;
1207	OUTPUT:	1682	OUTPUT:
1208	RETVAL	1683	RETVAL
1209		1684
1210	MODULE = IO::AIO PACKAGE = IO::AIO::REQ	1685	int
1211		1686	nready()
1212	void
1213	cancel (aio_req_ornot req)
1214	PROTOTYPE:	1687	PROTOTYPE:
1215	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:
1216	req_cancel (req);	1718	req_cancel (req);
1217		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);
		1725
1218	MODULE = IO::AIO PACKAGE = IO::AIO::GRP	1726	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1219		1727
1220	void	1728	void
1221	add (aio_req grp, ...)	1729	add (aio_req grp, ...)
1222	PROTOTYPE: $;@
1223	PPCODE:	1730	PPCODE:
1224	{	1731	{
1225	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");
1226		1737
1227	for (i = 1; i < items; ++i )	1738	for (i = 1; i < items; ++i )
1228	{	1739	{
1229	aio_req req = SvAIO_REQ (ST (i));
1230
1231	req->grp_prev = grp;
1232	req->grp_next = grp->grp_next;
1233	grp->grp_next->grp_prev = req;
1234	grp->grp_next = req;
1235
1236	req->grp = grp;
1237
1238	if (GIMME_V != G_VOID)	1740	if (GIMME_V != G_VOID)
1239	XPUSHs (sv_2mortal (newSVsv (ST (i))));	1741	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1742
		1743	req = SvAIO_REQ (ST (i));
		1744
		1745	if (req)
		1746	{
		1747	++grp->size;
		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;
		1757	}
1240	}	1758	}
1241	}	1759	}
1242		1760
		1761	void
		1762	cancel_subs (aio_req_ornot req)
		1763	CODE:
		1764	req_cancel_subs (req);
		1765
		1766	void
		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)
		1791	CODE:
		1792	grp->int2 = limit;
		1793	aio_grp_feed (grp);
		1794
		1795	void
		1796	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1797	CODE:
		1798	{
		1799	SvREFCNT_dec (grp->sv2);
		1800	grp->sv2 = newSVsv (callback);
		1801
		1802	if (grp->int2 <= 0)
		1803	grp->int2 = 2;
		1804
		1805	aio_grp_feed (grp);
		1806	}
		1807

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