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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.46 by root, Sun Oct 22 00:49:29 2006 UTC vs.
Revision 1.86 by root, Mon Oct 30 23:30:00 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
…		…
34	# else	43	# else
35	# error sendfile support requested but not available	44	# error sendfile support requested but not available
36	# endif	45	# endif
37	#endif	46	#endif
38		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
39	/* used for struct dirent, AIX doesn't provide it */	51	/* used for struct dirent, AIX doesn't provide it */
40	#ifndef NAME_MAX	52	#ifndef NAME_MAX
41	# define NAME_MAX 4096	53	# define NAME_MAX 4096
42	#endif	54	#endif
43		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
44	#if __ia64	61	#if __ia64
45	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
46	#else	65	#else
47	# define STACKSIZE 8192	66	# define STACKSIZE 16384
48	#endif	67	#endif
		68
		69	/* wether word reads are potentially non-atomic.
		70	* this is conservatice, likely most arches this runs
		71	* on have atomic word read/writes.
		72	*/
		73	#ifndef WORDACCESS_UNSAFE
		74	# if __i386 || __x86_64
		75	# define WORDACCESS_UNSAFE 0
		76	# else
		77	# define WORDACCESS_UNSAFE 1
		78	# endif
		79	#endif
		80
		81	/* buffer size for various temporary buffers */
		82	#define AIO_BUFSIZE 65536
		83
		84	#define dBUF \
		85	char *aio_buf; \
		86	LOCK (wrklock); \
		87	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		88	UNLOCK (wrklock); \
		89	if (!aio_buf) \
		90	return -1;
49		91
50	enum {	92	enum {
51	REQ_QUIT,	93	REQ_QUIT,
52	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
53	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
54	REQ_SENDFILE,	96	REQ_SENDFILE,
55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
56	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
57	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
58	REQ_READDIR,	100	REQ_MKNOD, REQ_READDIR,
59	REQ_LINK, REQ_SYMLINK,	101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
60	REQ_SLEEP,	102	REQ_GROUP, REQ_NOP,
61	REQ_GROUP,	103	REQ_BUSY,
62	};	104	};
63		105
64	#define AIO_REQ_KLASS "IO::AIO::REQ"	106	#define AIO_REQ_KLASS "IO::AIO::REQ"
65	#define AIO_GRP_KLASS "IO::AIO::GRP"	107	#define AIO_GRP_KLASS "IO::AIO::GRP"
66		108
67	typedef struct aio_cb	109	typedef struct aio_cb
68	{	110	{
69	struct aio_cb *grp, *grp_prev, *grp_next;
70
71	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
72		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	Stat_t *statdata;
		117	off_t offs;
		118	size_t size;
		119	ssize_t result;
		120
		121	STRLEN stroffset;
		122	int type;
		123	int int1, int2;
		124	int errorno;
		125	mode_t mode; /* open */
		126
		127	unsigned char flags;
		128	unsigned char pri;
		129
73	SV *self; /* the perl counterpart of this request, if any */	130	SV *self; /* the perl counterpart of this request, if any */
74		131	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
75	SV *data, *callback;
76	SV *fh, *fh2;
77	void *dataptr, *data2ptr;
78	Stat_t *statdata;
79	off_t offset;
80	size_t length;
81	ssize_t result;
82
83	int type;
84	int fd, fd2;
85	int errorno;
86	STRLEN dataoffset;
87	mode_t mode; /* open */
88	unsigned char cancelled;
89	} aio_cb;	132	} aio_cb;
		133
		134	enum {
		135	FLAG_CANCELLED = 0x01,
		136	FLAG_DATA_RO_OFF = 0x80, /* data was set readonly */
		137	};
90		138
91	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
92	typedef aio_cb *aio_req_ornot;	140	typedef aio_cb *aio_req_ornot;
93		141
		142	enum {
		143	PRI_MIN = -4,
		144	PRI_MAX = 4,
		145
		146	DEFAULT_PRI = 0,
		147	PRI_BIAS = -PRI_MIN,
		148	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		149	};
		150
		151	#define AIO_TICKS ((1000000 + 1023) >> 10)
		152
		153	static unsigned int max_poll_time = 0;
		154	static unsigned int max_poll_reqs = 0;
		155
		156	/* calculcate time difference in ~1/AIO_TICKS of a second */
		157	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		158	{
		159	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		160	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		161	}
		162
		163	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		164
94	static int started, wanted;	165	static unsigned int started, idle, wanted;
95	static volatile int nreqs;	166
96	static int max_outstanding = 1<<30;	167	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		168	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		169	#else
		170	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		171	#endif
		172
		173	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		174	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		175
		176	/* worker threads management */
		177	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		178
		179	typedef struct worker {
		180	/* locked by wrklock */
		181	struct worker *prev, *next;
		182
		183	pthread_t tid;
		184
		185	/* locked by reslock, reqlock or wrklock */
		186	aio_req req; /* currently processed request */
		187	void *dbuf;
		188	DIR *dirp;
		189	} worker;
		190
		191	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		192
		193	static void worker_clear (worker *wrk)
		194	{
		195	if (wrk->dirp)
		196	{
		197	closedir (wrk->dirp);
		198	wrk->dirp = 0;
		199	}
		200
		201	if (wrk->dbuf)
		202	{
		203	free (wrk->dbuf);
		204	wrk->dbuf = 0;
		205	}
		206	}
		207
		208	static void worker_free (worker *wrk)
		209	{
		210	wrk->next->prev = wrk->prev;
		211	wrk->prev->next = wrk->next;
		212
		213	free (wrk);
		214	}
		215
		216	static volatile unsigned int nreqs, nready, npending;
		217	static volatile unsigned int max_idle = 4;
		218	static volatile unsigned int max_outstanding = 0xffffffff;
97	static int respipe [2];	219	static int respipe [2];
98		220
99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
102		224
103	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
104	static volatile aio_req ress, rese; /* queue start, queue end */
105		226
		227	static unsigned int get_nready ()
		228	{
		229	unsigned int retval;
		230
		231	LOCK (reqlock);
		232	retval = nready;
		233	UNLOCK (reqlock);
		234
		235	return retval;
		236	}
		237
		238	static unsigned int get_npending ()
		239	{
		240	unsigned int retval;
		241
		242	LOCK (reslock);
		243	retval = npending;
		244	UNLOCK (reslock);
		245
		246	return retval;
		247	}
		248
		249	static unsigned int get_nthreads ()
		250	{
		251	unsigned int retval;
		252
		253	LOCK (wrklock);
		254	retval = started;
		255	UNLOCK (wrklock);
		256
		257	return retval;
		258	}
		259
		260	#else
		261
		262	# define get_nready() nready
		263	# define get_npending() npending
		264	# define get_nthreads() started
		265
		266	#endif
		267
		268	/*
		269	* a somewhat faster data structure might be nice, but
		270	* with 8 priorities this actually needs <20 insns
		271	* per shift, the most expensive operation.
		272	*/
		273	typedef struct {
		274	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		275	int size;
		276	} reqq;
		277
		278	static reqq req_queue;
		279	static reqq res_queue;
		280
		281	int reqq_push (reqq *q, aio_req req)
		282	{
		283	int pri = req->pri;
		284	req->next = 0;
		285
		286	if (q->qe[pri])
		287	{
		288	q->qe[pri]->next = req;
		289	q->qe[pri] = req;
		290	}
		291	else
		292	q->qe[pri] = q->qs[pri] = req;
		293
		294	return q->size++;
		295	}
		296
		297	aio_req reqq_shift (reqq *q)
		298	{
		299	int pri;
		300
		301	if (!q->size)
		302	return 0;
		303
		304	--q->size;
		305
		306	for (pri = NUM_PRI; pri--; )
		307	{
		308	aio_req req = q->qs[pri];
		309
		310	if (req)
		311	{
		312	if (!(q->qs[pri] = req->next))
		313	q->qe[pri] = 0;
		314
		315	return req;
		316	}
		317	}
		318
		319	abort ();
		320	}
		321
		322	static int poll_cb ();
		323	static void req_invoke (aio_req req);
106	static void req_free (aio_req req);	324	static void req_free (aio_req req);
		325	static void req_cancel (aio_req req);
107		326
108	/* must be called at most once */	327	/* must be called at most once */
109	static SV *req_sv (aio_req req, const char *klass)	328	static SV *req_sv (aio_req req, const char *klass)
110	{	329	{
		330	if (!req->self)
		331	{
111	req->self = (SV *)newHV ();	332	req->self = (SV *)newHV ();
112	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
113		335
114	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));	336	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
115	}	337	}
116		338
117	static aio_req SvAIO_REQ (SV *sv)	339	static aio_req SvAIO_REQ (SV *sv)
118	{	340	{
		341	MAGIC *mg;
		342
119	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))	343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
120	croak ("object of class " AIO_REQ_KLASS " expected");	344	croak ("object of class " AIO_REQ_KLASS " expected");
121		345
122	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
123		347
124	return mg ? (aio_req)mg->mg_ptr : 0;	348	return mg ? (aio_req)mg->mg_ptr : 0;
125	}	349	}
126		350
127	static void poll_wait ()	351	static void aio_grp_feed (aio_req grp)
128	{	352	{
129	if (nreqs && !ress)	353	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		354	{
		355	int old_len = grp->size;
		356
		357	if (grp->sv2 && SvOK (grp->sv2))
		358	{
		359	dSP;
		360
		361	ENTER;
		362	SAVETMPS;
		363	PUSHMARK (SP);
		364	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		365	PUTBACK;
		366	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		367	SPAGAIN;
		368	FREETMPS;
		369	LEAVE;
		370	}
		371
		372	/* stop if no progress has been made */
		373	if (old_len == grp->size)
		374	{
		375	SvREFCNT_dec (grp->sv2);
		376	grp->sv2 = 0;
		377	break;
		378	}
130	{	379	}
131	fd_set rfd;	380	}
132	FD_ZERO(&rfd);
133	FD_SET(respipe [0], &rfd);
134		381
135	select (respipe [0] + 1, &rfd, 0, 0, 0);	382	static void aio_grp_dec (aio_req grp)
		383	{
		384	--grp->size;
		385
		386	/* call feeder, if applicable */
		387	aio_grp_feed (grp);
		388
		389	/* finish, if done */
		390	if (!grp->size && grp->int1)
		391	{
		392	req_invoke (grp);
		393	req_free (grp);
136	}	394	}
137	}	395	}
138		396
139	static void req_invoke (aio_req req)	397	static void req_invoke (aio_req req)
140	{	398	{
141	dSP;	399	dSP;
142	int errorno = errno;
143		400
144	if (req->cancelled || !SvOK (req->callback))	401	if (req->flags & FLAG_DATA_RO_OFF)
145	return;	402	SvREADONLY_off (req->sv1);
146		403
147	errno = req->errorno;	404	if (req->statdata)
		405	{
		406	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		407	PL_laststatval = req->result;
		408	PL_statcache = *(req->statdata);
		409	}
148		410
		411	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		412	{
149	ENTER;	413	ENTER;
		414	SAVETMPS;
150	PUSHMARK (SP);	415	PUSHMARK (SP);
		416	EXTEND (SP, 1);
151		417
152	switch (req->type)	418	switch (req->type)
153	{
154	case REQ_READDIR:
155	{	419	{
156	SV *rv = &PL_sv_undef;	420	case REQ_READDIR:
157
158	if (req->result >= 0)
159	{	421	{
160	char *buf = req->data2ptr;	422	SV *rv = &PL_sv_undef;
161	AV *av = newAV ();
162		423
163	while (req->result)	424	if (req->result >= 0)
164	{	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	{
165	SV *sv = newSVpv (buf, 0);	434	SV *sv = newSVpv (buf, 0);
166		435
167	av_push (av, sv);	436	av_store (av, i, sv);
168	buf += SvCUR (sv) + 1;	437	buf += SvCUR (sv) + 1;
169	req->result--;	438	}
		439
		440	rv = sv_2mortal (newRV_noinc ((SV *)av));
170	}	441	}
171		442
172	rv = sv_2mortal (newRV_noinc ((SV *)av));	443	PUSHs (rv);
173	}	444	}
		445	break;
174		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;
175	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;
176	}	498	}
177	break;
178		499
179	case REQ_OPEN:	500	errno = req->errorno;
180	{
181	/* convert fd to fh */
182	SV *fh;
183		501
184	XPUSHs (sv_2mortal (newSViv (req->result)));
185	PUTBACK;	502	PUTBACK;
186	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
187	SPAGAIN;
188
189	fh = SvREFCNT_inc (POPs);
190
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	}
204
205
206	PUTBACK;
207	call_sv (req->callback, G_VOID | G_EVAL);	503	call_sv (req->callback, G_VOID | G_EVAL);
208	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	}
209		523
210	if (SvTRUE (ERRSV))	524	if (SvTRUE (ERRSV))
211	{	525	{
212	req_free (req);	526	req_free (req);
213	croak (0);	527	croak (0);
214	}	528	}
215
216	LEAVE;
217
218	errno = errorno;
219	}	529	}
220		530
221	static void req_free (aio_req req)	531	static void req_free (aio_req req)
222	{	532	{
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)	533	if (req->self)
239	{	534	{
240	sv_unmagic (req->self, PERL_MAGIC_ext);	535	sv_unmagic (req->self, PERL_MAGIC_ext);
241	SvREFCNT_dec (req->self);	536	SvREFCNT_dec (req->self);
242	}	537	}
243		538
244	if (req->data)
245	SvREFCNT_dec (req->data);
246
247	if (req->fh)
248	SvREFCNT_dec (req->fh);	539	SvREFCNT_dec (req->fh);
249		540	SvREFCNT_dec (req->sv1);
250	if (req->fh2)
251	SvREFCNT_dec (req->fh2);	541	SvREFCNT_dec (req->sv2);
252
253	if (req->statdata)
254	Safefree (req->statdata);
255
256	if (req->callback)
257	SvREFCNT_dec (req->callback);	542	SvREFCNT_dec (req->callback);
		543	Safefree (req->statdata);
258		544
259	if (req->type == REQ_READDIR && req->result >= 0)	545	if (req->type == REQ_READDIR)
260	free (req->data2ptr);	546	free (req->ptr2);
261		547
262	Safefree (req);	548	Safefree (req);
263	}	549	}
264		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
265	static void req_cancel (aio_req req)	565	static void req_cancel (aio_req req)
266	{	566	{
267	req->cancelled = 1;	567	req->flags |= FLAG_CANCELLED;
268		568
269	if (req->type == REQ_GROUP)	569	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	}	570	}
344		571
345	static void *aio_proc(void *arg);	572	static void *aio_proc(void *arg);
346		573
347	static void start_thread (void)	574	static void start_thread (void)
348	{	575	{
349	sigset_t fullsigset, oldsigset;	576	sigset_t fullsigset, oldsigset;
350	pthread_t tid;
351	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");
352		583
353	pthread_attr_init (&attr);	584	pthread_attr_init (&attr);
354	pthread_attr_setstacksize (&attr, STACKSIZE);	585	pthread_attr_setstacksize (&attr, STACKSIZE);
355	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
356		590
357	sigfillset (&fullsigset);	591	sigfillset (&fullsigset);
		592
		593	LOCK (wrklock);
358	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	594	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
359		595
360	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;
361	started++;	602	++started;
		603	}
		604	else
		605	free (wrk);
362		606
363	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 ();
364	}	621	}
365		622
366	static void req_send (aio_req req)	623	static void req_send (aio_req req)
367	{	624	{
368	while (started < wanted && nreqs >= started)
369	start_thread ();
370
371	nreqs++;	625	++nreqs;
372		626
373	pthread_mutex_lock (&reqlock);	627	LOCK (reqlock);
374		628	++nready;
375	req->next = 0;	629	reqq_push (&req_queue, req);
376
377	if (reqe)
378	{
379	reqe->next = req;
380	reqe = req;
381	}
382	else
383	reqe = reqs = req;
384
385	pthread_cond_signal (&reqwait);	630	pthread_cond_signal (&reqwait);
386	pthread_mutex_unlock (&reqlock);	631	UNLOCK (reqlock);
387		632
388	if (nreqs > max_outstanding)	633	maybe_start_thread ();
389	for (;;)
390	{
391	poll_cb ();
392
393	if (nreqs <= max_outstanding)
394	break;
395
396	poll_wait ();
397	}
398	}	634	}
399		635
400	static void end_thread (void)	636	static void end_thread (void)
401	{	637	{
402	aio_req req;	638	aio_req req;
		639
403	Newz (0, req, 1, aio_cb);	640	Newz (0, req, 1, aio_cb);
		641
404	req->type = REQ_QUIT;	642	req->type = REQ_QUIT;
		643	req->pri = PRI_MAX + PRI_BIAS;
405		644
406	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);
407	}	660	}
408		661
409	static void min_parallel (int nthreads)	662	static void min_parallel (int nthreads)
410	{	663	{
411	if (wanted < nthreads)	664	if (wanted < nthreads)
412	wanted = nthreads;	665	wanted = nthreads;
413	}	666	}
414		667
415	static void max_parallel (int nthreads)	668	static void max_parallel (int nthreads)
416	{	669	{
417	int cur = started;
418
419	if (wanted > nthreads)	670	if (wanted > nthreads)
420	wanted = nthreads;	671	wanted = nthreads;
421		672
422	while (cur > wanted)
423	{
424	end_thread ();
425	cur--;
426	}
427
428	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);
429	{	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
430	poll_wait ();	770	poll_wait ();
431	poll_cb ();	771
		772	++maxreqs;
432	}	773	}
		774
		775	return count;
433	}	776	}
434		777
435	static void create_pipe ()	778	static void create_pipe ()
436	{	779	{
437	if (pipe (respipe))	780	if (pipe (respipe))
…		…
461	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)
462	{	805	{
463	ssize_t res;	806	ssize_t res;
464	off_t ooffset;	807	off_t ooffset;
465		808
466	pthread_mutex_lock (&preadwritelock);	809	LOCK (preadwritelock);
467	ooffset = lseek (fd, 0, SEEK_CUR);	810	ooffset = lseek (fd, 0, SEEK_CUR);
468	lseek (fd, offset, SEEK_SET);	811	lseek (fd, offset, SEEK_SET);
469	res = read (fd, buf, count);	812	res = read (fd, buf, count);
470	lseek (fd, ooffset, SEEK_SET);	813	lseek (fd, ooffset, SEEK_SET);
471	pthread_mutex_unlock (&preadwritelock);	814	UNLOCK (preadwritelock);
472		815
473	return res;	816	return res;
474	}	817	}
475		818
476	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)
477	{	820	{
478	ssize_t res;	821	ssize_t res;
479	off_t ooffset;	822	off_t ooffset;
480		823
481	pthread_mutex_lock (&preadwritelock);	824	LOCK (preadwritelock);
482	ooffset = lseek (fd, 0, SEEK_CUR);	825	ooffset = lseek (fd, 0, SEEK_CUR);
483	lseek (fd, offset, SEEK_SET);	826	lseek (fd, offset, SEEK_SET);
484	res = write (fd, buf, count);	827	res = write (fd, buf, count);
485	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
486	pthread_mutex_unlock (&preadwritelock);	829	UNLOCK (preadwritelock);
487		830
488	return res;	831	return res;
489	}	832	}
490	#endif	833	#endif
491		834
492	#if !HAVE_FDATASYNC	835	#if !HAVE_FDATASYNC
493	# define fdatasync fsync	836	# define fdatasync fsync
494	#endif	837	#endif
495		838
496	#if !HAVE_READAHEAD	839	#if !HAVE_READAHEAD
497	# define readahead aio_readahead	840	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
498		841
499	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)
500	{	843	{
501	char readahead_buf[4096];	844	dBUF;
502		845
503	while (count > 0)	846	while (count > 0)
504	{	847	{
505	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	848	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
506		849
507	pread (fd, readahead_buf, len, offset);	850	pread (fd, aio_buf, len, offset);
508	offset += len;	851	offset += len;
509	count -= len;	852	count -= len;
510	}	853	}
511		854
512	errno = 0;	855	errno = 0;
513	}	856	}
		857
514	#endif	858	#endif
515		859
516	#if !HAVE_READDIR_R	860	#if !HAVE_READDIR_R
517	# define readdir_r aio_readdir_r	861	# define readdir_r aio_readdir_r
518		862
…		…
521	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)
522	{	866	{
523	struct dirent *e;	867	struct dirent *e;
524	int errorno;	868	int errorno;
525		869
526	pthread_mutex_lock (&readdirlock);	870	LOCK (readdirlock);
527		871
528	e = readdir (dirp);	872	e = readdir (dirp);
529	errorno = errno;	873	errorno = errno;
530		874
531	if (e)	875	if (e)
…		…
534	strcpy (ent->d_name, e->d_name);	878	strcpy (ent->d_name, e->d_name);
535	}	879	}
536	else	880	else
537	*res = 0;	881	*res = 0;
538		882
539	pthread_mutex_unlock (&readdirlock);	883	UNLOCK (readdirlock);
540		884
541	errno = errorno;	885	errno = errorno;
542	return e ? 0 : -1;	886	return e ? 0 : -1;
543	}	887	}
544	#endif	888	#endif
545		889
546	/* sendfile always needs emulation */	890	/* sendfile always needs emulation */
547	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)
548	{	892	{
549	ssize_t res;	893	ssize_t res;
550		894
551	if (!count)	895	if (!count)
552	return 0;	896	return 0;
…		…
563	{	907	{
564	off_t sbytes;	908	off_t sbytes;
565	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	909	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
566		910
567	if (res < 0 && sbytes)	911	if (res < 0 && sbytes)
568	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	912	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
569	res = sbytes;	913	res = sbytes;
570	}	914	}
571		915
572	# elif __hpux	916	# elif __hpux
573	res = sendfile (ofd, ifd, offset, count, 0, 0);	917	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
601	#endif	945	#endif
602	)	946	)
603	)	947	)
604	{	948	{
605	/* emulate sendfile. this is a major pain in the ass */	949	/* emulate sendfile. this is a major pain in the ass */
606	char buf[4096];	950	dBUF;
		951
607	res = 0;	952	res = 0;
608		953
609	while (count)	954	while (count)
610	{	955	{
611	ssize_t cnt;	956	ssize_t cnt;
612		957
613	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	958	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
614		959
615	if (cnt <= 0)	960	if (cnt <= 0)
616	{	961	{
617	if (cnt && !res) res = -1;	962	if (cnt && !res) res = -1;
618	break;	963	break;
619	}	964	}
620		965
621	cnt = write (ofd, buf, cnt);	966	cnt = write (ofd, aio_buf, cnt);
622		967
623	if (cnt <= 0)	968	if (cnt <= 0)
624	{	969	{
625	if (cnt && !res) res = -1;	970	if (cnt && !res) res = -1;
626	break;	971	break;
…		…
634		979
635	return res;	980	return res;
636	}	981	}
637		982
638	/* read a full directory */	983	/* read a full directory */
639	static int scandir_ (const char *path, void **namesp)	984	static void scandir_ (aio_req req, worker *self)
640	{	985	{
641	DIR *dirp = opendir (path);	986	DIR *dirp;
642	union	987	union
643	{	988	{
644	struct dirent d;	989	struct dirent d;
645	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	990	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
646	} u;	991	} *u;
647	struct dirent *entp;	992	struct dirent *entp;
648	char *name, *names;	993	char *name, *names;
649	int memlen = 4096;	994	int memlen = 4096;
650	int memofs = 0;	995	int memofs = 0;
651	int res = 0;	996	int res = 0;
652	int errorno;	997	int errorno;
653		998
654	if (!dirp)	999	LOCK (wrklock);
655	return -1;	1000	self->dirp = dirp = opendir (req->ptr1);
656		1001	self->dbuf = u = malloc (sizeof (*u));
657	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);
658		1055
659	for (;;)	1056	for (;;)
660	{	1057	{
661	errno = 0, readdir_r (dirp, &u.d, &entp);	1058	ts.tv_sec = time (0) + IDLE_TIMEOUT;
662		1059
663	if (!entp)	1060	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		1061
712	for (;;)	1062	for (;;)
713	{	1063	{
714	req = reqs;	1064	self->req = req = reqq_shift (&req_queue);
715
716	if (reqs)
717	{
718	reqs = reqs->next;
719	if (!reqs) reqe = 0;
720	}
721		1065
722	if (req)	1066	if (req)
723	break;	1067	break;
724		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 */
725	pthread_cond_wait (&reqwait, &reqlock);	1085	pthread_cond_wait (&reqwait, &reqlock);
		1086	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1087	}
		1088
		1089	--idle;
726	}	1090	}
727		1091
728	pthread_mutex_unlock (&reqlock);	1092	--nready;
		1093
		1094	UNLOCK (reqlock);
729		1095
730	errno = 0; /* strictly unnecessary */	1096	errno = 0; /* strictly unnecessary */
731		1097
732	if (!req->cancelled)	1098	if (!(req->flags & FLAG_CANCELLED))
733	switch (req->type)	1099	switch (req->type)
734	{	1100	{
735	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;
736	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;
737		1103
738	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;
739	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;
740		1106
741	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1107	case REQ_STAT: req->result = stat (req->ptr1, req->statdata); break;
742	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1108	case REQ_LSTAT: req->result = lstat (req->ptr1, req->statdata); break;
743	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1109	case REQ_FSTAT: req->result = fstat (req->int1, req->statdata); break;
744		1110
745	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;
746	case REQ_CLOSE: req->result = close (req->fd); break;	1112	case REQ_CLOSE: req->result = close (req->int1); break;
747	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1113	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
748	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1114	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
749	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1115	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
750	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1116	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
751	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;
752		1120
753	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1121	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
754	case REQ_FSYNC: req->result = fsync (req->fd); break;	1122	case REQ_FSYNC: req->result = fsync (req->int1); break;
755	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1123	case REQ_READDIR: scandir_ (req, self); break;
756		1124
757	case REQ_SLEEP:	1125	case REQ_BUSY:
758	{	1126	{
759	struct timeval tv;	1127	struct timeval tv;
760		1128
761	tv.tv_sec = req->fd;	1129	tv.tv_sec = req->int1;
762	tv.tv_usec = req->fd2;	1130	tv.tv_usec = req->int2;
763		1131
764	req->result = select (0, 0, 0, 0, &tv);	1132	req->result = select (0, 0, 0, 0, &tv);
765	}	1133	}
766		1134
		1135	case REQ_GROUP:
		1136	case REQ_NOP:
		1137	break;
		1138
767	case REQ_QUIT:	1139	case REQ_QUIT:
768	break;	1140	goto quit;
769		1141
770	default:	1142	default:
771	req->result = ENOSYS;	1143	req->result = ENOSYS;
772	break;	1144	break;
773	}	1145	}
774		1146
775	req->errorno = errno;	1147	req->errorno = errno;
776		1148
777	pthread_mutex_lock (&reslock);	1149	LOCK (reslock);
778		1150
779	req->next = 0;	1151	++npending;
780		1152
781	if (rese)	1153	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 */	1154	/* write a dummy byte to the pipe so fh becomes ready */
791	write (respipe [1], &respipe, 1);	1155	write (respipe [1], &respipe, 1);
792	}
793		1156
794	pthread_mutex_unlock (&reslock);	1157	self->req = 0;
		1158	worker_clear (self);
		1159
		1160	UNLOCK (reslock);
795	}	1161	}
796	while (type != REQ_QUIT);	1162
		1163	quit:
		1164	LOCK (wrklock);
		1165	worker_free (self);
		1166	UNLOCK (wrklock);
797		1167
798	return 0;	1168	return 0;
799	}	1169	}
800		1170
801	/*****************************************************************************/	1171	/*****************************************************************************/
802		1172
803	static void atfork_prepare (void)	1173	static void atfork_prepare (void)
804	{	1174	{
805	pthread_mutex_lock (&reqlock);	1175	LOCK (wrklock);
806	pthread_mutex_lock (&reslock);	1176	LOCK (reqlock);
		1177	LOCK (reslock);
807	#if !HAVE_PREADWRITE	1178	#if !HAVE_PREADWRITE
808	pthread_mutex_lock (&preadwritelock);	1179	LOCK (preadwritelock);
809	#endif	1180	#endif
810	#if !HAVE_READDIR_R	1181	#if !HAVE_READDIR_R
811	pthread_mutex_lock (&readdirlock);	1182	LOCK (readdirlock);
812	#endif	1183	#endif
813	}	1184	}
814		1185
815	static void atfork_parent (void)	1186	static void atfork_parent (void)
816	{	1187	{
817	#if !HAVE_READDIR_R	1188	#if !HAVE_READDIR_R
818	pthread_mutex_unlock (&readdirlock);	1189	UNLOCK (readdirlock);
819	#endif	1190	#endif
820	#if !HAVE_PREADWRITE	1191	#if !HAVE_PREADWRITE
821	pthread_mutex_unlock (&preadwritelock);	1192	UNLOCK (preadwritelock);
822	#endif	1193	#endif
823	pthread_mutex_unlock (&reslock);	1194	UNLOCK (reslock);
824	pthread_mutex_unlock (&reqlock);	1195	UNLOCK (reqlock);
		1196	UNLOCK (wrklock);
825	}	1197	}
826		1198
827	static void atfork_child (void)	1199	static void atfork_child (void)
828	{	1200	{
829	aio_req prv;	1201	aio_req prv;
830		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
831	started = 0;	1220	started = 0;
832		1221	idle = 0;
833	while (reqs)	1222	nreqs = 0;
834	{	1223	nready = 0;
835	prv = reqs;	1224	npending = 0;
836	reqs = prv->next;
837	req_free (prv);
838	}
839
840	reqs = reqe = 0;
841
842	while (ress)
843	{
844	prv = ress;
845	ress = prv->next;
846	req_free (prv);
847	}
848
849	ress = rese = 0;
850		1225
851	close (respipe [0]);	1226	close (respipe [0]);
852	close (respipe [1]);	1227	close (respipe [1]);
853	create_pipe ();	1228	create_pipe ();
854		1229
855	atfork_parent ();	1230	atfork_parent ();
856	}	1231	}
857		1232
858	#define dREQ \	1233	#define dREQ \
859	aio_req req; \	1234	aio_req req; \
		1235	int req_pri = next_pri; \
		1236	next_pri = DEFAULT_PRI + PRI_BIAS; \
860	\	1237	\
861	if (SvOK (callback) && !SvROK (callback)) \	1238	if (SvOK (callback) && !SvROK (callback)) \
862	croak ("callback must be undef or of reference type"); \	1239	croak ("callback must be undef or of reference type"); \
863	\	1240	\
864	Newz (0, req, 1, aio_cb); \	1241	Newz (0, req, 1, aio_cb); \
865	if (!req) \	1242	if (!req) \
866	croak ("out of memory during aio_req allocation"); \	1243	croak ("out of memory during aio_req allocation"); \
867	\	1244	\
868	req->callback = newSVsv (callback)	1245	req->callback = newSVsv (callback); \
		1246	req->pri = req_pri
869		1247
870	#define REQ_SEND \	1248	#define REQ_SEND \
871	req_send (req); \	1249	req_send (req); \
872	\	1250	\
873	if (GIMME_V != G_VOID) \	1251	if (GIMME_V != G_VOID) \
…		…
878	PROTOTYPES: ENABLE	1256	PROTOTYPES: ENABLE
879		1257
880	BOOT:	1258	BOOT:
881	{	1259	{
882	HV *stash = gv_stashpv ("IO::AIO", 1);	1260	HV *stash = gv_stashpv ("IO::AIO", 1);
		1261
883	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1262	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
884	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1263	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
885	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));
886		1268
887	create_pipe ();	1269	create_pipe ();
888	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1270	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
889	}	1271	}
890		1272
891	void	1273	void
892	min_parallel (nthreads)	1274	max_poll_reqs (int nreqs)
893	int nthreads
894	PROTOTYPE: $	1275	PROTOTYPE: $
		1276	CODE:
		1277	max_poll_reqs = nreqs;
895		1278
896	void	1279	void
897	max_parallel (nthreads)	1280	max_poll_time (double nseconds)
898	int nthreads
899	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);
900		1298
901	int	1299	int
902	max_outstanding (nreqs)	1300	max_outstanding (int maxreqs)
903	int nreqs	1301	PROTOTYPE: $
904	PROTOTYPE: $
905	CODE:	1302	CODE:
906	RETVAL = max_outstanding;	1303	RETVAL = max_outstanding;
907	max_outstanding = nreqs;	1304	max_outstanding = maxreqs;
		1305	OUTPUT:
		1306	RETVAL
908		1307
909	void	1308	void
910	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1309	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
911	SV * pathname	1310	SV * pathname
912	int flags	1311	int flags
…		…
916	PPCODE:	1315	PPCODE:
917	{	1316	{
918	dREQ;	1317	dREQ;
919		1318
920	req->type = REQ_OPEN;	1319	req->type = REQ_OPEN;
921	req->data = newSVsv (pathname);	1320	req->sv1 = newSVsv (pathname);
922	req->dataptr = SvPVbyte_nolen (req->data);	1321	req->ptr1 = SvPVbyte_nolen (pathname);
923	req->fd = flags;	1322	req->int1 = flags;
924	req->mode = mode;	1323	req->mode = mode;
925		1324
926	REQ_SEND;	1325	REQ_SEND;
927	}	1326	}
928		1327
…		…
938	PPCODE:	1337	PPCODE:
939	{	1338	{
940	dREQ;	1339	dREQ;
941		1340
942	req->type = ix;	1341	req->type = ix;
943	req->fh = newSVsv (fh);	1342	req->fh = newSVsv (fh);
944	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1343	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
945		1344
946	REQ_SEND (req);	1345	REQ_SEND (req);
947	}	1346	}
948		1347
949	void	1348	void
…		…
958	aio_read = REQ_READ	1357	aio_read = REQ_READ
959	aio_write = REQ_WRITE	1358	aio_write = REQ_WRITE
960	PROTOTYPE: $$$$$;$	1359	PROTOTYPE: $$$$$;$
961	PPCODE:	1360	PPCODE:
962	{	1361	{
963	aio_req req;
964	STRLEN svlen;	1362	STRLEN svlen;
965	char *svptr = SvPVbyte (data, svlen);	1363	char *svptr = SvPVbyte (data, svlen);
966		1364
967	SvUPGRADE (data, SVt_PV);	1365	SvUPGRADE (data, SVt_PV);
968	SvPOK_on (data);	1366	SvPOK_on (data);
…		…
990		1388
991	{	1389	{
992	dREQ;	1390	dREQ;
993		1391
994	req->type = ix;	1392	req->type = ix;
995	req->fh = newSVsv (fh);	1393	req->fh = newSVsv (fh);
996	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1394	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
997	: IoOFP (sv_2io (fh)));	1395	: IoOFP (sv_2io (fh)));
998	req->offset = offset;	1396	req->offs = offset;
999	req->length = length;	1397	req->size = length;
1000	req->data = SvREFCNT_inc (data);	1398	req->sv1 = SvREFCNT_inc (data);
1001	req->dataptr = (char *)svptr + dataoffset;	1399	req->ptr1 = (char *)svptr + dataoffset;
		1400	req->stroffset = dataoffset;
1002		1401
1003	if (!SvREADONLY (data))	1402	if (!SvREADONLY (data))
1004	{	1403	{
1005	SvREADONLY_on (data);	1404	SvREADONLY_on (data);
1006	req->data2ptr = (void *)data;	1405	req->flags |= FLAG_DATA_RO_OFF;
1007	}	1406	}
1008		1407
1009	REQ_SEND;	1408	REQ_SEND;
1010	}	1409	}
		1410	}
		1411
		1412	void
		1413	aio_readlink (path,callback=&PL_sv_undef)
		1414	SV * path
		1415	SV * callback
		1416	PROTOTYPE: $$;$
		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;
1011	}	1432	}
1012		1433
1013	void	1434	void
1014	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)
1015	SV * out_fh	1436	SV * out_fh
…		…
1021	PPCODE:	1442	PPCODE:
1022	{	1443	{
1023	dREQ;	1444	dREQ;
1024		1445
1025	req->type = REQ_SENDFILE;	1446	req->type = REQ_SENDFILE;
1026	req->fh = newSVsv (out_fh);	1447	req->fh = newSVsv (out_fh);
1027	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1028	req->fh2 = newSVsv (in_fh);	1449	req->sv2 = newSVsv (in_fh);
1029	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1450	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1030	req->offset = in_offset;	1451	req->offs = in_offset;
1031	req->length = length;	1452	req->size = length;
1032		1453
1033	REQ_SEND;	1454	REQ_SEND;
1034	}	1455	}
1035		1456
1036	void	1457	void
…		…
1043	PPCODE:	1464	PPCODE:
1044	{	1465	{
1045	dREQ;	1466	dREQ;
1046		1467
1047	req->type = REQ_READAHEAD;	1468	req->type = REQ_READAHEAD;
1048	req->fh = newSVsv (fh);	1469	req->fh = newSVsv (fh);
1049	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1470	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1050	req->offset = offset;	1471	req->offs = offset;
1051	req->length = length;	1472	req->size = length;
1052		1473
1053	REQ_SEND;	1474	REQ_SEND;
1054	}	1475	}
1055		1476
1056	void	1477	void
…		…
1072	}	1493	}
1073		1494
1074	if (SvPOK (fh_or_path))	1495	if (SvPOK (fh_or_path))
1075	{	1496	{
1076	req->type = ix;	1497	req->type = ix;
1077	req->data = newSVsv (fh_or_path);	1498	req->sv1 = newSVsv (fh_or_path);
1078	req->dataptr = SvPVbyte_nolen (req->data);	1499	req->ptr1 = SvPVbyte_nolen (fh_or_path);
1079	}	1500	}
1080	else	1501	else
1081	{	1502	{
1082	req->type = REQ_FSTAT;	1503	req->type = REQ_FSTAT;
1083	req->fh = newSVsv (fh_or_path);	1504	req->fh = newSVsv (fh_or_path);
1084	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1505	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1085	}	1506	}
1086		1507
1087	REQ_SEND;	1508	REQ_SEND;
1088	}	1509	}
1089		1510
1090	void	1511	void
1091	aio_unlink (pathname,callback=&PL_sv_undef)	1512	aio_unlink (pathname,callback=&PL_sv_undef)
1092	SV * pathname	1513	SV * pathname
1093	SV * callback	1514	SV * callback
1094	ALIAS:	1515	ALIAS:
1095	aio_unlink = REQ_UNLINK	1516	aio_unlink = REQ_UNLINK
1096	aio_rmdir = REQ_RMDIR	1517	aio_rmdir = REQ_RMDIR
1097	aio_readdir = REQ_READDIR	1518	aio_readdir = REQ_READDIR
1098	PPCODE:	1519	PPCODE:
1099	{	1520	{
1100	dREQ;	1521	dREQ;
1101		1522
1102	req->type = ix;	1523	req->type = ix;
1103	req->data = newSVsv (pathname);	1524	req->sv1 = newSVsv (pathname);
1104	req->dataptr = SvPVbyte_nolen (req->data);	1525	req->ptr1 = SvPVbyte_nolen (pathname);
1105		1526
1106	REQ_SEND;	1527	REQ_SEND;
1107	}	1528	}
1108		1529
1109	void	1530	void
1110	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1531	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1111	SV * oldpath	1532	SV * oldpath
1112	SV * newpath	1533	SV * newpath
1113	SV * callback	1534	SV * callback
1114	ALIAS:	1535	ALIAS:
1115	aio_link = REQ_LINK	1536	aio_link = REQ_LINK
1116	aio_symlink = REQ_SYMLINK	1537	aio_symlink = REQ_SYMLINK
1117	aio_rename = REQ_RENAME	1538	aio_rename = REQ_RENAME
1118	PPCODE:	1539	PPCODE:
1119	{	1540	{
1120	dREQ;	1541	dREQ;
1121		1542
1122	req->type = ix;	1543	req->type = ix;
1123	req->fh = newSVsv (oldpath);	1544	req->fh = newSVsv (oldpath);
1124	req->data2ptr = SvPVbyte_nolen (req->fh);	1545	req->ptr2 = SvPVbyte_nolen (req->fh);
1125	req->data = newSVsv (newpath);	1546	req->sv1 = newSVsv (newpath);
1126	req->dataptr = SvPVbyte_nolen (req->data);	1547	req->ptr1 = SvPVbyte_nolen (newpath);
1127		1548
1128	REQ_SEND;	1549	REQ_SEND;
1129	}	1550	}
1130		1551
1131	void	1552	void
1132	aio_sleep (delay,callback=&PL_sv_undef)	1553	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
1133	double delay	1554	SV * pathname
1134	SV * callback	1555	SV * callback
		1556	UV mode
		1557	UV dev
1135	PPCODE:	1558	PPCODE:
1136	{	1559	{
1137	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	}
1138		1570
		1571	void
		1572	aio_busy (delay,callback=&PL_sv_undef)
		1573	double delay
		1574	SV * callback
		1575	PPCODE:
		1576	{
		1577	dREQ;
		1578
1139	req->type = REQ_SLEEP;	1579	req->type = REQ_BUSY;
1140	req->fd = delay < 0. ? 0 : delay;	1580	req->int1 = delay < 0. ? 0 : delay;
1141	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);	1581	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
1142		1582
1143	REQ_SEND;	1583	REQ_SEND;
1144	}	1584	}
1145		1585
1146	void	1586	void
…		…
1148	SV * callback	1588	SV * callback
1149	PROTOTYPE: ;$	1589	PROTOTYPE: ;$
1150	PPCODE:	1590	PPCODE:
1151	{	1591	{
1152	dREQ;	1592	dREQ;
		1593
1153	req->type = REQ_GROUP;	1594	req->type = REQ_GROUP;
1154	req->grp_next = req;
1155	req->grp_prev = req;
1156		1595
1157	req_send (req);	1596	req_send (req);
1158	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1597	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1159	}	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;
1160		1633
1161	void	1634	void
1162	flush ()	1635	flush ()
1163	PROTOTYPE:	1636	PROTOTYPE:
1164	CODE:	1637	CODE:
1165	while (nreqs)	1638	while (nreqs)
1166	{	1639	{
1167	poll_wait ();	1640	poll_wait ();
1168	poll_cb ();	1641	poll_cb (0);
1169	}	1642	}
1170		1643
1171	void	1644	void
1172	poll()	1645	poll()
1173	PROTOTYPE:	1646	PROTOTYPE:
1174	CODE:	1647	CODE:
1175	if (nreqs)	1648	if (nreqs)
1176	{	1649	{
1177	poll_wait ();	1650	poll_wait ();
1178	poll_cb ();	1651	poll_cb (0);
1179	}	1652	}
1180		1653
1181	int	1654	int
1182	poll_fileno()	1655	poll_fileno()
1183	PROTOTYPE:	1656	PROTOTYPE:
…		…
1207	CODE:	1680	CODE:
1208	RETVAL = nreqs;	1681	RETVAL = nreqs;
1209	OUTPUT:	1682	OUTPUT:
1210	RETVAL	1683	RETVAL
1211		1684
1212	MODULE = IO::AIO PACKAGE = IO::AIO::REQ	1685	int
1213		1686	nready()
1214	void
1215	cancel (aio_req_ornot req)
1216	PROTOTYPE:	1687	PROTOTYPE:
1217	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:
1218	req_cancel (req);	1718	req_cancel (req);
1219		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
1220	MODULE = IO::AIO PACKAGE = IO::AIO::GRP	1726	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1221		1727
1222	void	1728	void
1223	add (aio_req grp, ...)	1729	add (aio_req grp, ...)
1224	PROTOTYPE: $;@
1225	PPCODE:	1730	PPCODE:
1226	{	1731	{
1227	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");
1228		1737
1229	for (i = 1; i < items; ++i )	1738	for (i = 1; i < items; ++i )
1230	{	1739	{
1231	if (GIMME_V != G_VOID)	1740	if (GIMME_V != G_VOID)
1232	XPUSHs (sv_2mortal (newSVsv (ST (i))));	1741	XPUSHs (sv_2mortal (newSVsv (ST (i))));
1233		1742
1234	aio_req req = SvAIO_REQ (ST (i));	1743	req = SvAIO_REQ (ST (i));
1235	printf ("req = %p\n", req);//D
1236		1744
1237	if (req)	1745	if (req)
1238	{	1746	{
1239	req->grp_prev = grp;	1747	++grp->size;
1240	req->grp_next = grp->grp_next;
1241	grp->grp_next->grp_prev = req;
1242	grp->grp_next = req;
1243
1244	req->grp = grp;	1748	req->grp = grp;
		1749
		1750	req->grp_prev = 0;
		1751	req->grp_next = grp->grp_first;
		1752
		1753	if (grp->grp_first)
		1754	grp->grp_first->grp_prev = req;
		1755
		1756	grp->grp_first = req;
1245	}	1757	}
1246	}	1758	}
1247	}	1759	}
1248		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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