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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.63 by root, Mon Oct 23 23:48:31 2006 UTC vs.
Revision 1.86 by root, Mon Oct 30 23:30:00 2006 UTC

1	#if __linux	1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
2	# define _GNU_SOURCE	5	# define _GNU_SOURCE
3	#endif	6	#endif
4		7
		8	/* just in case */
5	#define _REENTRANT 1	9	#define _REENTRANT 1
6		10
7	#include <errno.h>	11	#include <errno.h>
8		12
9	#include "EXTERN.h"	13	#include "EXTERN.h"
…		…
39	# else	43	# else
40	# error sendfile support requested but not available	44	# error sendfile support requested but not available
41	# endif	45	# endif
42	#endif	46	#endif
43		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
44	/* used for struct dirent, AIX doesn't provide it */	51	/* used for struct dirent, AIX doesn't provide it */
45	#ifndef NAME_MAX	52	#ifndef NAME_MAX
46	# define NAME_MAX 4096	53	# define NAME_MAX 4096
47	#endif	54	#endif
48		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
49	#if __ia64	61	#if __ia64
50	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
51	#else	65	#else
52	# define STACKSIZE 8192	66	# define STACKSIZE 16384
53	#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;
54		91
55	enum {	92	enum {
56	REQ_QUIT,	93	REQ_QUIT,
57	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
58	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
59	REQ_SENDFILE,	96	REQ_SENDFILE,
60	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
61	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
62	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
63	REQ_READDIR,	100	REQ_MKNOD, REQ_READDIR,
64	REQ_LINK, REQ_SYMLINK,	101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
65	REQ_GROUP, REQ_NOP,	102	REQ_GROUP, REQ_NOP,
66	REQ_SLEEP,	103	REQ_BUSY,
67	};	104	};
68		105
69	#define AIO_REQ_KLASS "IO::AIO::REQ"	106	#define AIO_REQ_KLASS "IO::AIO::REQ"
70	#define AIO_GRP_KLASS "IO::AIO::GRP"	107	#define AIO_GRP_KLASS "IO::AIO::GRP"
71		108
72	typedef struct aio_cb	109	typedef struct aio_cb
73	{	110	{
74	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
75		112
76	SV *data, *callback;	113	SV *callback, *fh;
77	SV *fh, *fh2;	114	SV *sv1, *sv2;
78	void *dataptr, *data2ptr;	115	void *ptr1, *ptr2;
79	Stat_t *statdata;	116	Stat_t *statdata;
80	off_t offset;	117	off_t offs;
81	size_t length;	118	size_t size;
82	ssize_t result;	119	ssize_t result;
83		120
84	STRLEN dataoffset;	121	STRLEN stroffset;
85	int type;	122	int type;
86	int fd, fd2;	123	int int1, int2;
87	int errorno;	124	int errorno;
88	mode_t mode; /* open */	125	mode_t mode; /* open */
89		126
90	unsigned char flags;	127	unsigned char flags;
91	unsigned char pri;	128	unsigned char pri;
…		…
93	SV *self; /* the perl counterpart of this request, if any */	130	SV *self; /* the perl counterpart of this request, if any */
94	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;	131	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
95	} aio_cb;	132	} aio_cb;
96		133
97	enum {	134	enum {
98	FLAG_CANCELLED = 0x01,	135	FLAG_CANCELLED = 0x01,
		136	FLAG_DATA_RO_OFF = 0x80, /* data was set readonly */
99	};	137	};
100		138
101	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
102	typedef aio_cb *aio_req_ornot;	140	typedef aio_cb *aio_req_ornot;
103		141
…		…
105	PRI_MIN = -4,	143	PRI_MIN = -4,
106	PRI_MAX = 4,	144	PRI_MAX = 4,
107		145
108	DEFAULT_PRI = 0,	146	DEFAULT_PRI = 0,
109	PRI_BIAS = -PRI_MIN,	147	PRI_BIAS = -PRI_MIN,
		148	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
110	};	149	};
111		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
112	static int next_pri = DEFAULT_PRI + PRI_BIAS;	163	static int next_pri = DEFAULT_PRI + PRI_BIAS;
113		164
114	static int started, wanted;	165	static unsigned int started, idle, wanted;
115	static volatile int nreqs;
116	static int max_outstanding = 1<<30;
117	static int respipe [2];
118		166
119	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)	167	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
120	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP	168	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
121	#else	169	#else
122	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER	170	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
123	#endif	171	#endif
124		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;
		219	static int respipe [2];
		220
125	static pthread_mutex_t reslock = AIO_MUTEX_INIT;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
126	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
127	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
128		224
129	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
130	static volatile aio_req ress, rese; /* queue start, queue end */
131		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 ();
132	static void req_invoke (aio_req req);	323	static void req_invoke (aio_req req);
133	static void req_free (aio_req req);	324	static void req_free (aio_req req);
		325	static void req_cancel (aio_req req);
134		326
135	/* must be called at most once */	327	/* must be called at most once */
136	static SV *req_sv (aio_req req, const char *klass)	328	static SV *req_sv (aio_req req, const char *klass)
137	{	329	{
138	if (!req->self)	330	if (!req->self)
…		…
156	return mg ? (aio_req)mg->mg_ptr : 0;	348	return mg ? (aio_req)mg->mg_ptr : 0;
157	}	349	}
158		350
159	static void aio_grp_feed (aio_req grp)	351	static void aio_grp_feed (aio_req grp)
160	{	352	{
161	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))	353	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
162	{	354	{
163	int old_len = grp->length;	355	int old_len = grp->size;
164		356
165	if (grp->fh2 && SvOK (grp->fh2))	357	if (grp->sv2 && SvOK (grp->sv2))
166	{	358	{
167	dSP;	359	dSP;
168		360
169	ENTER;	361	ENTER;
170	SAVETMPS;	362	SAVETMPS;
171	PUSHMARK (SP);	363	PUSHMARK (SP);
172	XPUSHs (req_sv (grp, AIO_GRP_KLASS));	364	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
173	PUTBACK;	365	PUTBACK;
174	call_sv (grp->fh2, G_VOID | G_EVAL);	366	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
175	SPAGAIN;	367	SPAGAIN;
176	FREETMPS;	368	FREETMPS;
177	LEAVE;	369	LEAVE;
178	}	370	}
179		371
180	/* stop if no progress has been made */	372	/* stop if no progress has been made */
181	if (old_len == grp->length)	373	if (old_len == grp->size)
182	{	374	{
183	SvREFCNT_dec (grp->fh2);	375	SvREFCNT_dec (grp->sv2);
184	grp->fh2 = 0;	376	grp->sv2 = 0;
185	break;	377	break;
186	}	378	}
187	}	379	}
188	}	380	}
189		381
190	static void aio_grp_dec (aio_req grp)	382	static void aio_grp_dec (aio_req grp)
191	{	383	{
192	--grp->length;	384	--grp->size;
193		385
194	/* call feeder, if applicable */	386	/* call feeder, if applicable */
195	aio_grp_feed (grp);	387	aio_grp_feed (grp);
196		388
197	/* finish, if done */	389	/* finish, if done */
198	if (!grp->length && grp->fd)	390	if (!grp->size && grp->int1)
199	{	391	{
200	req_invoke (grp);	392	req_invoke (grp);
201	req_free (grp);	393	req_free (grp);
202	}	394	}
203	}	395	}
204		396
205	static void poll_wait ()
206	{
207	fd_set rfd;
208
209	while (nreqs)
210	{
211	aio_req req;
212	pthread_mutex_lock (&reslock);
213	req = ress;
214	pthread_mutex_unlock (&reslock);
215
216	if (req)
217	return;
218
219	FD_ZERO(&rfd);
220	FD_SET(respipe [0], &rfd);
221
222	select (respipe [0] + 1, &rfd, 0, 0, 0);
223	}
224	}
225
226	static void req_invoke (aio_req req)	397	static void req_invoke (aio_req req)
227	{	398	{
228	dSP;	399	dSP;
229	int errorno = errno;
230		400
		401	if (req->flags & FLAG_DATA_RO_OFF)
		402	SvREADONLY_off (req->sv1);
		403
		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	}
		410
231	if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))	411	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
232	return;	412	{
233
234	errno = req->errorno;
235
236	ENTER;	413	ENTER;
237	SAVETMPS;	414	SAVETMPS;
238	PUSHMARK (SP);	415	PUSHMARK (SP);
239	EXTEND (SP, 1);	416	EXTEND (SP, 1);
240		417
241	switch (req->type)	418	switch (req->type)
242	{
243	case REQ_READDIR:
244	{	419	{
245	SV *rv = &PL_sv_undef;	420	case REQ_READDIR:
246
247	if (req->result >= 0)
248	{	421	{
249	char *buf = req->data2ptr;	422	SV *rv = &PL_sv_undef;
250	AV *av = newAV ();
251		423
252	while (req->result)	424	if (req->result >= 0)
253	{	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	{
254	SV *sv = newSVpv (buf, 0);	434	SV *sv = newSVpv (buf, 0);
255		435
256	av_push (av, sv);	436	av_store (av, i, sv);
257	buf += SvCUR (sv) + 1;	437	buf += SvCUR (sv) + 1;
258	req->result--;	438	}
		439
		440	rv = sv_2mortal (newRV_noinc ((SV *)av));
259	}	441	}
260		442
261	rv = sv_2mortal (newRV_noinc ((SV *)av));	443	PUSHs (rv);
262	}	444	}
		445	break;
263		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;
264	PUSHs (rv);	487	PUSHs (req->sv1);
		488	}
		489	break;
		490
		491	case REQ_READ:
		492	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		493	*SvEND (req->sv1) = 0;
		494	/* fall through */
		495	default:
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
265	}	498	}
266	break;
267		499
268	case REQ_OPEN:	500	errno = req->errorno;
269	{
270	/* convert fd to fh */
271	SV *fh;
272		501
273	PUSHs (sv_2mortal (newSViv (req->result)));
274	PUTBACK;	502	PUTBACK;
275	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
276	SPAGAIN;
277
278	fh = SvREFCNT_inc (POPs);
279
280	PUSHMARK (SP);
281	XPUSHs (sv_2mortal (fh));
282	}
283	break;
284
285	case REQ_GROUP:
286	req->fd = 2; /* mark group as finished */
287
288	if (req->data)
289	{
290	int i;
291	AV *av = (AV *)req->data;
292
293	EXTEND (SP, AvFILL (av) + 1);
294	for (i = 0; i <= AvFILL (av); ++i)
295	PUSHs (*av_fetch (av, i, 0));
296	}
297	break;
298
299	case REQ_NOP:
300	case REQ_SLEEP:
301	break;
302
303	default:
304	PUSHs (sv_2mortal (newSViv (req->result)));
305	break;
306	}
307
308
309	PUTBACK;
310	call_sv (req->callback, G_VOID | G_EVAL);	503	call_sv (req->callback, G_VOID | G_EVAL);
311	SPAGAIN;	504	SPAGAIN;
312		505
313	FREETMPS;	506	FREETMPS;
314	LEAVE;	507	LEAVE;
315
316	errno = errorno;
317
318	if (SvTRUE (ERRSV))
319	{	508	}
320	req_free (req);
321	croak (0);
322	}
323	}
324		509
325	static void req_free (aio_req req)
326	{
327	if (req->grp)	510	if (req->grp)
328	{	511	{
329	aio_req grp = req->grp;	512	aio_req grp = req->grp;
330		513
331	/* unlink request */	514	/* unlink request */
…		…
336	grp->grp_first = req->grp_next;	519	grp->grp_first = req->grp_next;
337		520
338	aio_grp_dec (grp);	521	aio_grp_dec (grp);
339	}	522	}
340		523
		524	if (SvTRUE (ERRSV))
		525	{
		526	req_free (req);
		527	croak (0);
		528	}
		529	}
		530
		531	static void req_free (aio_req req)
		532	{
341	if (req->self)	533	if (req->self)
342	{	534	{
343	sv_unmagic (req->self, PERL_MAGIC_ext);	535	sv_unmagic (req->self, PERL_MAGIC_ext);
344	SvREFCNT_dec (req->self);	536	SvREFCNT_dec (req->self);
345	}	537	}
346		538
347	SvREFCNT_dec (req->data);
348	SvREFCNT_dec (req->fh);	539	SvREFCNT_dec (req->fh);
		540	SvREFCNT_dec (req->sv1);
349	SvREFCNT_dec (req->fh2);	541	SvREFCNT_dec (req->sv2);
350	SvREFCNT_dec (req->callback);	542	SvREFCNT_dec (req->callback);
351	Safefree (req->statdata);	543	Safefree (req->statdata);
352		544
353	if (req->type == REQ_READDIR && req->result >= 0)	545	if (req->type == REQ_READDIR)
354	free (req->data2ptr);	546	free (req->ptr2);
355		547
356	Safefree (req);	548	Safefree (req);
357	}	549	}
358		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
359	static void req_cancel (aio_req req)	565	static void req_cancel (aio_req req)
360	{	566	{
361	req->flags |= FLAG_CANCELLED;	567	req->flags |= FLAG_CANCELLED;
362		568
363	if (req->type == REQ_GROUP)	569	req_cancel_subs (req);
364	{
365	aio_req sub;
366
367	for (sub = req->grp_first; sub; sub = sub->grp_next)
368	req_cancel (sub);
369	}
370	}
371
372	static int poll_cb ()
373	{
374	dSP;
375	int count = 0;
376	int do_croak = 0;
377	aio_req req;
378
379	for (;;)
380	{
381	pthread_mutex_lock (&reslock);
382	req = ress;
383
384	if (req)
385	{
386	ress = req->next;
387
388	if (!ress)
389	{
390	/* read any signals sent by the worker threads */
391	char buf [32];
392	while (read (respipe [0], buf, 32) == 32)
393	;
394
395	rese = 0;
396	}
397	}
398
399	pthread_mutex_unlock (&reslock);
400
401	if (!req)
402	break;
403
404	--nreqs;
405
406	if (req->type == REQ_QUIT)
407	started--;
408	else if (req->type == REQ_GROUP && req->length)
409	{
410	req->fd = 1; /* mark request as delayed */
411	continue;
412	}
413	else
414	{
415	if (req->type == REQ_READ)
416	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
417
418	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
419	SvREADONLY_off (req->data);
420
421	if (req->statdata)
422	{
423	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
424	PL_laststatval = req->result;
425	PL_statcache = *(req->statdata);
426	}
427
428	req_invoke (req);
429
430	count++;
431	}
432
433	req_free (req);
434	}
435
436	return count;
437	}	570	}
438		571
439	static void *aio_proc(void *arg);	572	static void *aio_proc(void *arg);
440		573
441	static void start_thread (void)	574	static void start_thread (void)
442	{	575	{
443	sigset_t fullsigset, oldsigset;	576	sigset_t fullsigset, oldsigset;
444	pthread_t tid;
445	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");
446		583
447	pthread_attr_init (&attr);	584	pthread_attr_init (&attr);
448	pthread_attr_setstacksize (&attr, STACKSIZE);	585	pthread_attr_setstacksize (&attr, STACKSIZE);
449	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
450		590
451	sigfillset (&fullsigset);	591	sigfillset (&fullsigset);
		592
		593	LOCK (wrklock);
452	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	594	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
453		595
454	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;
455	started++;	602	++started;
		603	}
		604	else
		605	free (wrk);
456		606
457	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 ();
458	}	621	}
459		622
460	static void req_send (aio_req req)	623	static void req_send (aio_req req)
461	{	624	{
462	while (started < wanted && nreqs >= started)
463	start_thread ();
464
465	++nreqs;	625	++nreqs;
466		626
467	pthread_mutex_lock (&reqlock);	627	LOCK (reqlock);
468		628	++nready;
469	req->next = 0;	629	reqq_push (&req_queue, req);
470
471	if (reqe)
472	{
473	reqe->next = req;
474	reqe = req;
475	}
476	else
477	reqe = reqs = req;
478
479	pthread_cond_signal (&reqwait);	630	pthread_cond_signal (&reqwait);
480	pthread_mutex_unlock (&reqlock);	631	UNLOCK (reqlock);
481		632
482	if (nreqs > max_outstanding)	633	maybe_start_thread ();
483	for (;;)
484	{
485	poll_cb ();
486
487	if (nreqs <= max_outstanding)
488	break;
489
490	poll_wait ();
491	}
492	}	634	}
493		635
494	static void end_thread (void)	636	static void end_thread (void)
495	{	637	{
496	aio_req req;	638	aio_req req;
		639
497	Newz (0, req, 1, aio_cb);	640	Newz (0, req, 1, aio_cb);
		641
498	req->type = REQ_QUIT;	642	req->type = REQ_QUIT;
		643	req->pri = PRI_MAX + PRI_BIAS;
499		644
500	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);
501	}	660	}
502		661
503	static void min_parallel (int nthreads)	662	static void min_parallel (int nthreads)
504	{	663	{
505	if (wanted < nthreads)	664	if (wanted < nthreads)
506	wanted = nthreads;	665	wanted = nthreads;
507	}	666	}
508		667
509	static void max_parallel (int nthreads)	668	static void max_parallel (int nthreads)
510	{	669	{
511	int cur = started;
512
513	if (wanted > nthreads)	670	if (wanted > nthreads)
514	wanted = nthreads;	671	wanted = nthreads;
515		672
516	while (cur > wanted)
517	{
518	end_thread ();
519	cur--;
520	}
521
522	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);
523	{	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
524	poll_wait ();	770	poll_wait ();
525	poll_cb ();	771
		772	++maxreqs;
526	}	773	}
		774
		775	return count;
527	}	776	}
528		777
529	static void create_pipe ()	778	static void create_pipe ()
530	{	779	{
531	if (pipe (respipe))	780	if (pipe (respipe))
…		…
555	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)
556	{	805	{
557	ssize_t res;	806	ssize_t res;
558	off_t ooffset;	807	off_t ooffset;
559		808
560	pthread_mutex_lock (&preadwritelock);	809	LOCK (preadwritelock);
561	ooffset = lseek (fd, 0, SEEK_CUR);	810	ooffset = lseek (fd, 0, SEEK_CUR);
562	lseek (fd, offset, SEEK_SET);	811	lseek (fd, offset, SEEK_SET);
563	res = read (fd, buf, count);	812	res = read (fd, buf, count);
564	lseek (fd, ooffset, SEEK_SET);	813	lseek (fd, ooffset, SEEK_SET);
565	pthread_mutex_unlock (&preadwritelock);	814	UNLOCK (preadwritelock);
566		815
567	return res;	816	return res;
568	}	817	}
569		818
570	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)
571	{	820	{
572	ssize_t res;	821	ssize_t res;
573	off_t ooffset;	822	off_t ooffset;
574		823
575	pthread_mutex_lock (&preadwritelock);	824	LOCK (preadwritelock);
576	ooffset = lseek (fd, 0, SEEK_CUR);	825	ooffset = lseek (fd, 0, SEEK_CUR);
577	lseek (fd, offset, SEEK_SET);	826	lseek (fd, offset, SEEK_SET);
578	res = write (fd, buf, count);	827	res = write (fd, buf, count);
579	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
580	pthread_mutex_unlock (&preadwritelock);	829	UNLOCK (preadwritelock);
581		830
582	return res;	831	return res;
583	}	832	}
584	#endif	833	#endif
585		834
586	#if !HAVE_FDATASYNC	835	#if !HAVE_FDATASYNC
587	# define fdatasync fsync	836	# define fdatasync fsync
588	#endif	837	#endif
589		838
590	#if !HAVE_READAHEAD	839	#if !HAVE_READAHEAD
591	# define readahead aio_readahead	840	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
592		841
593	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)
594	{	843	{
595	char readahead_buf[4096];	844	dBUF;
596		845
597	while (count > 0)	846	while (count > 0)
598	{	847	{
599	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	848	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
600		849
601	pread (fd, readahead_buf, len, offset);	850	pread (fd, aio_buf, len, offset);
602	offset += len;	851	offset += len;
603	count -= len;	852	count -= len;
604	}	853	}
605		854
606	errno = 0;	855	errno = 0;
607	}	856	}
		857
608	#endif	858	#endif
609		859
610	#if !HAVE_READDIR_R	860	#if !HAVE_READDIR_R
611	# define readdir_r aio_readdir_r	861	# define readdir_r aio_readdir_r
612		862
…		…
615	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)
616	{	866	{
617	struct dirent *e;	867	struct dirent *e;
618	int errorno;	868	int errorno;
619		869
620	pthread_mutex_lock (&readdirlock);	870	LOCK (readdirlock);
621		871
622	e = readdir (dirp);	872	e = readdir (dirp);
623	errorno = errno;	873	errorno = errno;
624		874
625	if (e)	875	if (e)
…		…
628	strcpy (ent->d_name, e->d_name);	878	strcpy (ent->d_name, e->d_name);
629	}	879	}
630	else	880	else
631	*res = 0;	881	*res = 0;
632		882
633	pthread_mutex_unlock (&readdirlock);	883	UNLOCK (readdirlock);
634		884
635	errno = errorno;	885	errno = errorno;
636	return e ? 0 : -1;	886	return e ? 0 : -1;
637	}	887	}
638	#endif	888	#endif
639		889
640	/* sendfile always needs emulation */	890	/* sendfile always needs emulation */
641	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)
642	{	892	{
643	ssize_t res;	893	ssize_t res;
644		894
645	if (!count)	895	if (!count)
646	return 0;	896	return 0;
…		…
657	{	907	{
658	off_t sbytes;	908	off_t sbytes;
659	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	909	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
660		910
661	if (res < 0 && sbytes)	911	if (res < 0 && sbytes)
662	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	912	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
663	res = sbytes;	913	res = sbytes;
664	}	914	}
665		915
666	# elif __hpux	916	# elif __hpux
667	res = sendfile (ofd, ifd, offset, count, 0, 0);	917	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
695	#endif	945	#endif
696	)	946	)
697	)	947	)
698	{	948	{
699	/* emulate sendfile. this is a major pain in the ass */	949	/* emulate sendfile. this is a major pain in the ass */
700	char buf[4096];	950	dBUF;
		951
701	res = 0;	952	res = 0;
702		953
703	while (count)	954	while (count)
704	{	955	{
705	ssize_t cnt;	956	ssize_t cnt;
706		957
707	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	958	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
708		959
709	if (cnt <= 0)	960	if (cnt <= 0)
710	{	961	{
711	if (cnt && !res) res = -1;	962	if (cnt && !res) res = -1;
712	break;	963	break;
713	}	964	}
714		965
715	cnt = write (ofd, buf, cnt);	966	cnt = write (ofd, aio_buf, cnt);
716		967
717	if (cnt <= 0)	968	if (cnt <= 0)
718	{	969	{
719	if (cnt && !res) res = -1;	970	if (cnt && !res) res = -1;
720	break;	971	break;
…		…
728		979
729	return res;	980	return res;
730	}	981	}
731		982
732	/* read a full directory */	983	/* read a full directory */
733	static int scandir_ (const char *path, void **namesp)	984	static void scandir_ (aio_req req, worker *self)
734	{	985	{
735	DIR *dirp = opendir (path);	986	DIR *dirp;
736	union	987	union
737	{	988	{
738	struct dirent d;	989	struct dirent d;
739	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	990	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
740	} u;	991	} *u;
741	struct dirent *entp;	992	struct dirent *entp;
742	char *name, *names;	993	char *name, *names;
743	int memlen = 4096;	994	int memlen = 4096;
744	int memofs = 0;	995	int memofs = 0;
745	int res = 0;	996	int res = 0;
746	int errorno;	997	int errorno;
747		998
748	if (!dirp)	999	LOCK (wrklock);
749	return -1;	1000	self->dirp = dirp = opendir (req->ptr1);
750		1001	self->dbuf = u = malloc (sizeof (*u));
751	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);
752		1055
753	for (;;)	1056	for (;;)
754	{	1057	{
755	errno = 0, readdir_r (dirp, &u.d, &entp);	1058	ts.tv_sec = time (0) + IDLE_TIMEOUT;
756		1059
757	if (!entp)	1060	LOCK (reqlock);
758	break;
759
760	name = entp->d_name;
761
762	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
763	{
764	int len = strlen (name) + 1;
765
766	res++;
767
768	while (memofs + len > memlen)
769	{
770	memlen *= 2;
771	names = realloc (names, memlen);
772	if (!names)
773	break;
774	}
775
776	memcpy (names + memofs, name, len);
777	memofs += len;
778	}
779	}
780
781	errorno = errno;
782	closedir (dirp);
783
784	if (errorno)
785	{
786	free (names);
787	errno = errorno;
788	res = -1;
789	}
790
791	*namesp = (void *)names;
792	return res;
793	}
794
795	/*****************************************************************************/
796
797	static void *aio_proc (void *thr_arg)
798	{
799	aio_req req;
800	int type;
801
802	do
803	{
804	pthread_mutex_lock (&reqlock);
805		1061
806	for (;;)	1062	for (;;)
807	{	1063	{
808	req = reqs;	1064	self->req = req = reqq_shift (&req_queue);
809
810	if (reqs)
811	{
812	reqs = reqs->next;
813	if (!reqs) reqe = 0;
814	}
815		1065
816	if (req)	1066	if (req)
817	break;	1067	break;
818		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 */
819	pthread_cond_wait (&reqwait, &reqlock);	1085	pthread_cond_wait (&reqwait, &reqlock);
		1086	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1087	}
		1088
		1089	--idle;
820	}	1090	}
821		1091
822	pthread_mutex_unlock (&reqlock);	1092	--nready;
		1093
		1094	UNLOCK (reqlock);
823		1095
824	errno = 0; /* strictly unnecessary */	1096	errno = 0; /* strictly unnecessary */
825	type = req->type; /* remember type for QUIT check */
826		1097
827	if (!(req->flags & FLAG_CANCELLED))	1098	if (!(req->flags & FLAG_CANCELLED))
828	switch (type)	1099	switch (req->type)
829	{	1100	{
830	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;
831	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;
832		1103
833	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;
834	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;
835		1106
836	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1107	case REQ_STAT: req->result = stat (req->ptr1, req->statdata); break;
837	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1108	case REQ_LSTAT: req->result = lstat (req->ptr1, req->statdata); break;
838	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1109	case REQ_FSTAT: req->result = fstat (req->int1, req->statdata); break;
839		1110
840	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;
841	case REQ_CLOSE: req->result = close (req->fd); break;	1112	case REQ_CLOSE: req->result = close (req->int1); break;
842	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1113	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
843	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1114	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
844	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1115	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
845	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1116	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
846	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;
847		1120
848	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1121	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
849	case REQ_FSYNC: req->result = fsync (req->fd); break;	1122	case REQ_FSYNC: req->result = fsync (req->int1); break;
850	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1123	case REQ_READDIR: scandir_ (req, self); break;
851		1124
852	case REQ_SLEEP:	1125	case REQ_BUSY:
853	{	1126	{
854	struct timeval tv;	1127	struct timeval tv;
855		1128
856	tv.tv_sec = req->fd;	1129	tv.tv_sec = req->int1;
857	tv.tv_usec = req->fd2;	1130	tv.tv_usec = req->int2;
858		1131
859	req->result = select (0, 0, 0, 0, &tv);	1132	req->result = select (0, 0, 0, 0, &tv);
860	}	1133	}
861		1134
862	case REQ_GROUP:	1135	case REQ_GROUP:
863	case REQ_NOP:	1136	case REQ_NOP:
		1137	break;
		1138
864	case REQ_QUIT:	1139	case REQ_QUIT:
865	break;	1140	goto quit;
866		1141
867	default:	1142	default:
868	req->result = ENOSYS;	1143	req->result = ENOSYS;
869	break;	1144	break;
870	}	1145	}
871		1146
872	req->errorno = errno;	1147	req->errorno = errno;
873		1148
874	pthread_mutex_lock (&reslock);	1149	LOCK (reslock);
875		1150
876	req->next = 0;	1151	++npending;
877		1152
878	if (rese)	1153	if (!reqq_push (&res_queue, req))
879	{
880	rese->next = req;
881	rese = req;
882	}
883	else
884	{
885	rese = ress = req;
886
887	/* write a dummy byte to the pipe so fh becomes ready */	1154	/* write a dummy byte to the pipe so fh becomes ready */
888	write (respipe [1], &respipe, 1);	1155	write (respipe [1], &respipe, 1);
889	}
890		1156
891	pthread_mutex_unlock (&reslock);	1157	self->req = 0;
		1158	worker_clear (self);
		1159
		1160	UNLOCK (reslock);
892	}	1161	}
893	while (type != REQ_QUIT);	1162
		1163	quit:
		1164	LOCK (wrklock);
		1165	worker_free (self);
		1166	UNLOCK (wrklock);
894		1167
895	return 0;	1168	return 0;
896	}	1169	}
897		1170
898	/*****************************************************************************/	1171	/*****************************************************************************/
899		1172
900	static void atfork_prepare (void)	1173	static void atfork_prepare (void)
901	{	1174	{
902	pthread_mutex_lock (&reqlock);	1175	LOCK (wrklock);
903	pthread_mutex_lock (&reslock);	1176	LOCK (reqlock);
		1177	LOCK (reslock);
904	#if !HAVE_PREADWRITE	1178	#if !HAVE_PREADWRITE
905	pthread_mutex_lock (&preadwritelock);	1179	LOCK (preadwritelock);
906	#endif	1180	#endif
907	#if !HAVE_READDIR_R	1181	#if !HAVE_READDIR_R
908	pthread_mutex_lock (&readdirlock);	1182	LOCK (readdirlock);
909	#endif	1183	#endif
910	}	1184	}
911		1185
912	static void atfork_parent (void)	1186	static void atfork_parent (void)
913	{	1187	{
914	#if !HAVE_READDIR_R	1188	#if !HAVE_READDIR_R
915	pthread_mutex_unlock (&readdirlock);	1189	UNLOCK (readdirlock);
916	#endif	1190	#endif
917	#if !HAVE_PREADWRITE	1191	#if !HAVE_PREADWRITE
918	pthread_mutex_unlock (&preadwritelock);	1192	UNLOCK (preadwritelock);
919	#endif	1193	#endif
920	pthread_mutex_unlock (&reslock);	1194	UNLOCK (reslock);
921	pthread_mutex_unlock (&reqlock);	1195	UNLOCK (reqlock);
		1196	UNLOCK (wrklock);
922	}	1197	}
923		1198
924	static void atfork_child (void)	1199	static void atfork_child (void)
925	{	1200	{
926	aio_req prv;	1201	aio_req prv;
927		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
928	started = 0;	1220	started = 0;
929		1221	idle = 0;
930	while (reqs)	1222	nreqs = 0;
931	{	1223	nready = 0;
932	prv = reqs;	1224	npending = 0;
933	reqs = prv->next;
934	req_free (prv);
935	}
936
937	reqs = reqe = 0;
938
939	while (ress)
940	{
941	prv = ress;
942	ress = prv->next;
943	req_free (prv);
944	}
945
946	ress = rese = 0;
947		1225
948	close (respipe [0]);	1226	close (respipe [0]);
949	close (respipe [1]);	1227	close (respipe [1]);
950	create_pipe ();	1228	create_pipe ();
951		1229
…		…
978	PROTOTYPES: ENABLE	1256	PROTOTYPES: ENABLE
979		1257
980	BOOT:	1258	BOOT:
981	{	1259	{
982	HV *stash = gv_stashpv ("IO::AIO", 1);	1260	HV *stash = gv_stashpv ("IO::AIO", 1);
		1261
983	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1262	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
984	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1263	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
985	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));
986		1268
987	create_pipe ();	1269	create_pipe ();
988	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1270	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
989	}	1271	}
990		1272
991	void	1273	void
992	min_parallel (nthreads)	1274	max_poll_reqs (int nreqs)
993	int nthreads
994	PROTOTYPE: $	1275	PROTOTYPE: $
		1276	CODE:
		1277	max_poll_reqs = nreqs;
995		1278
996	void	1279	void
997	max_parallel (nthreads)	1280	max_poll_time (double nseconds)
998	int nthreads
999	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);
1000		1298
1001	int	1299	int
1002	max_outstanding (nreqs)	1300	max_outstanding (int maxreqs)
1003	int nreqs	1301	PROTOTYPE: $
1004	PROTOTYPE: $
1005	CODE:	1302	CODE:
1006	RETVAL = max_outstanding;	1303	RETVAL = max_outstanding;
1007	max_outstanding = nreqs;	1304	max_outstanding = maxreqs;
		1305	OUTPUT:
		1306	RETVAL
1008		1307
1009	void	1308	void
1010	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1309	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
1011	SV * pathname	1310	SV * pathname
1012	int flags	1311	int flags
…		…
1016	PPCODE:	1315	PPCODE:
1017	{	1316	{
1018	dREQ;	1317	dREQ;
1019		1318
1020	req->type = REQ_OPEN;	1319	req->type = REQ_OPEN;
1021	req->data = newSVsv (pathname);	1320	req->sv1 = newSVsv (pathname);
1022	req->dataptr = SvPVbyte_nolen (req->data);	1321	req->ptr1 = SvPVbyte_nolen (pathname);
1023	req->fd = flags;	1322	req->int1 = flags;
1024	req->mode = mode;	1323	req->mode = mode;
1025		1324
1026	REQ_SEND;	1325	REQ_SEND;
1027	}	1326	}
1028		1327
…		…
1038	PPCODE:	1337	PPCODE:
1039	{	1338	{
1040	dREQ;	1339	dREQ;
1041		1340
1042	req->type = ix;	1341	req->type = ix;
1043	req->fh = newSVsv (fh);	1342	req->fh = newSVsv (fh);
1044	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1343	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1045		1344
1046	REQ_SEND (req);	1345	REQ_SEND (req);
1047	}	1346	}
1048		1347
1049	void	1348	void
…		…
1058	aio_read = REQ_READ	1357	aio_read = REQ_READ
1059	aio_write = REQ_WRITE	1358	aio_write = REQ_WRITE
1060	PROTOTYPE: $$$$$;$	1359	PROTOTYPE: $$$$$;$
1061	PPCODE:	1360	PPCODE:
1062	{	1361	{
1063	aio_req req;
1064	STRLEN svlen;	1362	STRLEN svlen;
1065	char *svptr = SvPVbyte (data, svlen);	1363	char *svptr = SvPVbyte (data, svlen);
1066		1364
1067	SvUPGRADE (data, SVt_PV);	1365	SvUPGRADE (data, SVt_PV);
1068	SvPOK_on (data);	1366	SvPOK_on (data);
…		…
1090		1388
1091	{	1389	{
1092	dREQ;	1390	dREQ;
1093		1391
1094	req->type = ix;	1392	req->type = ix;
1095	req->fh = newSVsv (fh);	1393	req->fh = newSVsv (fh);
1096	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1394	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
1097	: IoOFP (sv_2io (fh)));	1395	: IoOFP (sv_2io (fh)));
1098	req->offset = offset;	1396	req->offs = offset;
1099	req->length = length;	1397	req->size = length;
1100	req->data = SvREFCNT_inc (data);	1398	req->sv1 = SvREFCNT_inc (data);
1101	req->dataptr = (char *)svptr + dataoffset;	1399	req->ptr1 = (char *)svptr + dataoffset;
		1400	req->stroffset = dataoffset;
1102		1401
1103	if (!SvREADONLY (data))	1402	if (!SvREADONLY (data))
1104	{	1403	{
1105	SvREADONLY_on (data);	1404	SvREADONLY_on (data);
1106	req->data2ptr = (void *)data;	1405	req->flags |= FLAG_DATA_RO_OFF;
1107	}	1406	}
1108		1407
1109	REQ_SEND;	1408	REQ_SEND;
1110	}	1409	}
		1410	}
		1411
		1412	void
		1413	aio_readlink (path,callback=&PL_sv_undef)
		1414	SV * path
		1415	SV * callback
		1416	PROTOTYPE: $$;$
		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;
1111	}	1432	}
1112		1433
1113	void	1434	void
1114	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)
1115	SV * out_fh	1436	SV * out_fh
…		…
1121	PPCODE:	1442	PPCODE:
1122	{	1443	{
1123	dREQ;	1444	dREQ;
1124		1445
1125	req->type = REQ_SENDFILE;	1446	req->type = REQ_SENDFILE;
1126	req->fh = newSVsv (out_fh);	1447	req->fh = newSVsv (out_fh);
1127	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1128	req->fh2 = newSVsv (in_fh);	1449	req->sv2 = newSVsv (in_fh);
1129	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1450	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1130	req->offset = in_offset;	1451	req->offs = in_offset;
1131	req->length = length;	1452	req->size = length;
1132		1453
1133	REQ_SEND;	1454	REQ_SEND;
1134	}	1455	}
1135		1456
1136	void	1457	void
…		…
1143	PPCODE:	1464	PPCODE:
1144	{	1465	{
1145	dREQ;	1466	dREQ;
1146		1467
1147	req->type = REQ_READAHEAD;	1468	req->type = REQ_READAHEAD;
1148	req->fh = newSVsv (fh);	1469	req->fh = newSVsv (fh);
1149	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1470	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1150	req->offset = offset;	1471	req->offs = offset;
1151	req->length = length;	1472	req->size = length;
1152		1473
1153	REQ_SEND;	1474	REQ_SEND;
1154	}	1475	}
1155		1476
1156	void	1477	void
…		…
1172	}	1493	}
1173		1494
1174	if (SvPOK (fh_or_path))	1495	if (SvPOK (fh_or_path))
1175	{	1496	{
1176	req->type = ix;	1497	req->type = ix;
1177	req->data = newSVsv (fh_or_path);	1498	req->sv1 = newSVsv (fh_or_path);
1178	req->dataptr = SvPVbyte_nolen (req->data);	1499	req->ptr1 = SvPVbyte_nolen (fh_or_path);
1179	}	1500	}
1180	else	1501	else
1181	{	1502	{
1182	req->type = REQ_FSTAT;	1503	req->type = REQ_FSTAT;
1183	req->fh = newSVsv (fh_or_path);	1504	req->fh = newSVsv (fh_or_path);
1184	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1505	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1185	}	1506	}
1186		1507
1187	REQ_SEND;	1508	REQ_SEND;
1188	}	1509	}
1189		1510
1190	void	1511	void
1191	aio_unlink (pathname,callback=&PL_sv_undef)	1512	aio_unlink (pathname,callback=&PL_sv_undef)
1192	SV * pathname	1513	SV * pathname
1193	SV * callback	1514	SV * callback
1194	ALIAS:	1515	ALIAS:
1195	aio_unlink = REQ_UNLINK	1516	aio_unlink = REQ_UNLINK
1196	aio_rmdir = REQ_RMDIR	1517	aio_rmdir = REQ_RMDIR
1197	aio_readdir = REQ_READDIR	1518	aio_readdir = REQ_READDIR
1198	PPCODE:	1519	PPCODE:
1199	{	1520	{
1200	dREQ;	1521	dREQ;
1201		1522
1202	req->type = ix;	1523	req->type = ix;
1203	req->data = newSVsv (pathname);	1524	req->sv1 = newSVsv (pathname);
1204	req->dataptr = SvPVbyte_nolen (req->data);	1525	req->ptr1 = SvPVbyte_nolen (pathname);
1205		1526
1206	REQ_SEND;	1527	REQ_SEND;
1207	}	1528	}
1208		1529
1209	void	1530	void
1210	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1531	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1211	SV * oldpath	1532	SV * oldpath
1212	SV * newpath	1533	SV * newpath
1213	SV * callback	1534	SV * callback
1214	ALIAS:	1535	ALIAS:
1215	aio_link = REQ_LINK	1536	aio_link = REQ_LINK
1216	aio_symlink = REQ_SYMLINK	1537	aio_symlink = REQ_SYMLINK
1217	aio_rename = REQ_RENAME	1538	aio_rename = REQ_RENAME
1218	PPCODE:	1539	PPCODE:
1219	{	1540	{
1220	dREQ;	1541	dREQ;
1221		1542
1222	req->type = ix;	1543	req->type = ix;
1223	req->fh = newSVsv (oldpath);	1544	req->fh = newSVsv (oldpath);
1224	req->data2ptr = SvPVbyte_nolen (req->fh);	1545	req->ptr2 = SvPVbyte_nolen (req->fh);
1225	req->data = newSVsv (newpath);	1546	req->sv1 = newSVsv (newpath);
1226	req->dataptr = SvPVbyte_nolen (req->data);	1547	req->ptr1 = SvPVbyte_nolen (newpath);
1227		1548
1228	REQ_SEND;	1549	REQ_SEND;
1229	}	1550	}
1230		1551
1231	void	1552	void
1232	aio_sleep (delay,callback=&PL_sv_undef)	1553	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
1233	double delay	1554	SV * pathname
1234	SV * callback	1555	SV * callback
		1556	UV mode
		1557	UV dev
1235	PPCODE:	1558	PPCODE:
1236	{	1559	{
1237	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	}
1238		1570
		1571	void
		1572	aio_busy (delay,callback=&PL_sv_undef)
		1573	double delay
		1574	SV * callback
		1575	PPCODE:
		1576	{
		1577	dREQ;
		1578
1239	req->type = REQ_SLEEP;	1579	req->type = REQ_BUSY;
1240	req->fd = delay < 0. ? 0 : delay;	1580	req->int1 = delay < 0. ? 0 : delay;
1241	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);	1581	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
1242		1582
1243	REQ_SEND;	1583	REQ_SEND;
1244	}	1584	}
1245		1585
1246	void	1586	void
…		…
1250	PPCODE:	1590	PPCODE:
1251	{	1591	{
1252	dREQ;	1592	dREQ;
1253		1593
1254	req->type = REQ_GROUP;	1594	req->type = REQ_GROUP;
		1595
1255	req_send (req);	1596	req_send (req);
1256
1257	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1597	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1258	}	1598	}
1259		1599
1260	void	1600	void
1261	aio_nop (callback=&PL_sv_undef)	1601	aio_nop (callback=&PL_sv_undef)
1262	SV * callback	1602	SV * callback
1263	PPCODE:	1603	PPCODE:
1264	{	1604	{
1265	dREQ;	1605	dREQ;
1266		1606
1267	req->type = REQ_NOP;	1607	req->type = REQ_NOP;
1268		1608
1269	REQ_SEND;	1609	REQ_SEND;
1270	}	1610	}
1271		1611
1272	#if 0	1612	int
1273		1613	aioreq_pri (int pri = 0)
1274	void	1614	PROTOTYPE: ;$
1275	aio_pri (int pri = DEFAULT_PRI)
1276	CODE:	1615	CODE:
		1616	RETVAL = next_pri - PRI_BIAS;
		1617	if (items > 0)
		1618	{
1277	if (pri < PRI_MIN) pri = PRI_MIN;	1619	if (pri < PRI_MIN) pri = PRI_MIN;
1278	if (pri > PRI_MAX) pri = PRI_MAX;	1620	if (pri > PRI_MAX) pri = PRI_MAX;
1279	next_pri = pri + PRI_BIAS;	1621	next_pri = pri + PRI_BIAS;
		1622	}
		1623	OUTPUT:
		1624	RETVAL
1280		1625
1281	#endif	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;
1282		1633
1283	void	1634	void
1284	flush ()	1635	flush ()
1285	PROTOTYPE:	1636	PROTOTYPE:
1286	CODE:	1637	CODE:
1287	while (nreqs)	1638	while (nreqs)
1288	{	1639	{
1289	poll_wait ();	1640	poll_wait ();
1290	poll_cb ();	1641	poll_cb (0);
1291	}	1642	}
1292		1643
1293	void	1644	void
1294	poll()	1645	poll()
1295	PROTOTYPE:	1646	PROTOTYPE:
1296	CODE:	1647	CODE:
1297	if (nreqs)	1648	if (nreqs)
1298	{	1649	{
1299	poll_wait ();	1650	poll_wait ();
1300	poll_cb ();	1651	poll_cb (0);
1301	}	1652	}
1302		1653
1303	int	1654	int
1304	poll_fileno()	1655	poll_fileno()
1305	PROTOTYPE:	1656	PROTOTYPE:
…		…
1329	CODE:	1680	CODE:
1330	RETVAL = nreqs;	1681	RETVAL = nreqs;
1331	OUTPUT:	1682	OUTPUT:
1332	RETVAL	1683	RETVAL
1333		1684
		1685	int
		1686	nready()
		1687	PROTOTYPE:
		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
1334	PROTOTYPES: DISABLE	1711	PROTOTYPES: DISABLE
1335		1712
1336	MODULE = IO::AIO PACKAGE = IO::AIO::REQ	1713	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1337		1714
1338	void	1715	void
1339	cancel (aio_req_ornot req)	1716	cancel (aio_req_ornot req)
1340	PROTOTYPE:
1341	CODE:	1717	CODE:
1342	req_cancel (req);	1718	req_cancel (req);
1343		1719
1344	void	1720	void
1345	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)	1721	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
…		…
1354	PPCODE:	1730	PPCODE:
1355	{	1731	{
1356	int i;	1732	int i;
1357	aio_req req;	1733	aio_req req;
1358		1734
1359	if (grp->fd == 2)	1735	if (grp->int1 == 2)
1360	croak ("cannot add requests to IO::AIO::GRP after the group finished");	1736	croak ("cannot add requests to IO::AIO::GRP after the group finished");
1361		1737
1362	for (i = 1; i < items; ++i )	1738	for (i = 1; i < items; ++i )
1363	{	1739	{
1364	if (GIMME_V != G_VOID)	1740	if (GIMME_V != G_VOID)
…		…
1366		1742
1367	req = SvAIO_REQ (ST (i));	1743	req = SvAIO_REQ (ST (i));
1368		1744
1369	if (req)	1745	if (req)
1370	{	1746	{
1371	++grp->length;	1747	++grp->size;
1372	req->grp = grp;	1748	req->grp = grp;
1373		1749
1374	req->grp_prev = 0;	1750	req->grp_prev = 0;
1375	req->grp_next = grp->grp_first;	1751	req->grp_next = grp->grp_first;
1376		1752
…		…
1381	}	1757	}
1382	}	1758	}
1383	}	1759	}
1384		1760
1385	void	1761	void
		1762	cancel_subs (aio_req_ornot req)
		1763	CODE:
		1764	req_cancel_subs (req);
		1765
		1766	void
1386	result (aio_req grp, ...)	1767	result (aio_req grp, ...)
1387	CODE:	1768	CODE:
1388	{	1769	{
1389	int i;	1770	int i;
		1771	AV *av;
		1772
		1773	grp->errorno = errno;
		1774
1390	AV *av = newAV ();	1775	av = newAV ();
1391		1776
1392	for (i = 1; i < items; ++i )	1777	for (i = 1; i < items; ++i )
1393	av_push (av, newSVsv (ST (i)));	1778	av_push (av, newSVsv (ST (i)));
1394		1779
1395	SvREFCNT_dec (grp->data);	1780	SvREFCNT_dec (grp->sv1);
1396	grp->data = (SV *)av;	1781	grp->sv1 = (SV *)av;
1397	}	1782	}
1398		1783
1399	void	1784	void
		1785	errno (aio_req grp, int errorno = errno)
		1786	CODE:
		1787	grp->errorno = errorno;
		1788
		1789	void
1400	feed_limit (aio_req grp, int limit)	1790	limit (aio_req grp, int limit)
1401	CODE:	1791	CODE:
1402	grp->fd2 = limit;	1792	grp->int2 = limit;
1403	aio_grp_feed (grp);	1793	aio_grp_feed (grp);
1404		1794
1405	void	1795	void
1406	feed (aio_req grp, SV *callback=&PL_sv_undef)	1796	feed (aio_req grp, SV *callback=&PL_sv_undef)
1407	CODE:	1797	CODE:
1408	{	1798	{
1409	SvREFCNT_dec (grp->fh2);	1799	SvREFCNT_dec (grp->sv2);
1410	grp->fh2 = newSVsv (callback);	1800	grp->sv2 = newSVsv (callback);
1411		1801
1412	if (grp->fd2 <= 0)	1802	if (grp->int2 <= 0)
1413	grp->fd2 = 2;	1803	grp->int2 = 2;
1414		1804
1415	aio_grp_feed (grp);	1805	aio_grp_feed (grp);
1416	}	1806	}
1417		1807

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