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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.35 by root, Tue Aug 23 01:16:50 2005 UTC vs.
Revision 1.87 by root, Mon Oct 30 23:42:27 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
7		16
8	#include "autoconf/config.h"	17	#include "autoconf/config.h"
9		18
10	#include <pthread.h>	19	#include <pthread.h>
11		20
		21	#include <stddef.h>
		22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
12	#include <sys/types.h>	25	#include <sys/types.h>
13	#include <sys/stat.h>	26	#include <sys/stat.h>
14		27	#include <limits.h>
15	#include <unistd.h>	28	#include <unistd.h>
16	#include <fcntl.h>	29	#include <fcntl.h>
17	#include <signal.h>	30	#include <signal.h>
18	#include <sched.h>	31	#include <sched.h>
19		32
…		…
30	# else	43	# else
31	# error sendfile support requested but not available	44	# error sendfile support requested but not available
32	# endif	45	# endif
33	#endif	46	#endif
34		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
		51	/* used for struct dirent, AIX doesn't provide it */
		52	#ifndef NAME_MAX
		53	# define NAME_MAX 4096
		54	#endif
		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
35	#if __ia64	61	#if __ia64
36	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
37	#else	65	#else
38	# define STACKSIZE 4096	66	# define STACKSIZE 16384
39	#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;
40		91
41	enum {	92	enum {
42	REQ_QUIT,	93	REQ_QUIT,
43	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
44	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
45	REQ_SENDFILE,	96	REQ_SENDFILE,
46	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
47	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
48	REQ_UNLINK, REQ_RMDIR,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
49	REQ_SYMLINK,	100	REQ_MKNOD, REQ_READDIR,
		101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		102	REQ_GROUP, REQ_NOP,
		103	REQ_BUSY,
50	};	104	};
51		105
		106	#define AIO_REQ_KLASS "IO::AIO::REQ"
		107	#define AIO_GRP_KLASS "IO::AIO::GRP"
		108
52	typedef struct aio_cb {	109	typedef struct aio_cb
		110	{
53	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
54		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	off_t offs;
		117	size_t size;
		118	ssize_t result;
		119
		120	STRLEN stroffset;
55	int type;	121	int type;
56		122	int int1, int2;
57	int fd, fd2;	123	int errorno;
58	off_t offset;
59	size_t length;
60	ssize_t result;
61	mode_t mode; /* open */	124	mode_t mode; /* open */
62	int errorno;
63	SV *data, *callback;
64	SV *fh, *fh2;
65	void *dataptr, *data2ptr;
66	STRLEN dataoffset;
67		125
68	Stat_t *statdata;	126	unsigned char flags;
		127	unsigned char pri;
		128
		129	SV *self; /* the perl counterpart of this request, if any */
		130	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
69	} aio_cb;	131	} aio_cb;
70		132
		133	enum {
		134	FLAG_CANCELLED = 0x01,
		135	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		136	FLAG_PTR2_FREE = 0x80, /* need free(ptr2) */
		137	};
		138
71	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
		140	typedef aio_cb *aio_req_ornot;
72		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
73	static int started, wanted;	165	static unsigned int started, idle, wanted;
74	static volatile int nreqs;	166
75	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;
76	static int respipe [2];	219	static int respipe [2];
77		220
78	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
79	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
80	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
81		224
82	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
83	static volatile aio_req ress, rese; /* queue start, queue end */
84		226
85	static void free_req (aio_req req)	227	static unsigned int get_nready ()
86	{	228	{
87	if (req->data)	229	unsigned int retval;
88	SvREFCNT_dec (req->data);
89		230
90	if (req->fh)	231	LOCK (reqlock);
91	SvREFCNT_dec (req->fh);	232	retval = nready;
		233	UNLOCK (reqlock);
92		234
93	if (req->fh2)	235	return retval;
94	SvREFCNT_dec (req->fh2);
95
96	if (req->statdata)
97	Safefree (req->statdata);
98
99	if (req->callback)
100	SvREFCNT_dec (req->callback);
101
102	Safefree (req);
103	}	236	}
104		237
105	static void	238	static unsigned int get_npending ()
106	poll_wait ()
107	{	239	{
108	if (nreqs && !ress)	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])
109	{	287	{
110	fd_set rfd;	288	q->qe[pri]->next = req;
111	FD_ZERO(&rfd);	289	q->qe[pri] = req;
112	FD_SET(respipe [0], &rfd);
113
114	select (respipe [0] + 1, &rfd, 0, 0, 0);
115	}	290	}
116	}	291	else
		292	q->qe[pri] = q->qs[pri] = req;
117		293
118	static int	294	return q->size++;
119	poll_cb ()	295	}
120	{
121	dSP;
122	int count = 0;
123	int do_croak = 0;
124	aio_req req;
125		296
126	for (;;)	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--; )
127	{	307	{
128	pthread_mutex_lock (&reslock);	308	aio_req req = q->qs[pri];
129	req = ress;
130		309
131	if (req)	310	if (req)
132	{	311	{
133	ress = req->next;	312	if (!(q->qs[pri] = req->next))
		313	q->qe[pri] = 0;
134		314
135	if (!ress)	315	return req;
		316	}
		317	}
		318
		319	abort ();
		320	}
		321
		322	static int poll_cb ();
		323	static void req_invoke (aio_req req);
		324	static void req_free (aio_req req);
		325	static void req_cancel (aio_req req);
		326
		327	/* must be called at most once */
		328	static SV *req_sv (aio_req req, const char *klass)
		329	{
		330	if (!req->self)
		331	{
		332	req->self = (SV *)newHV ();
		333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
		335
		336	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		337	}
		338
		339	static aio_req SvAIO_REQ (SV *sv)
		340	{
		341	MAGIC *mg;
		342
		343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		344	croak ("object of class " AIO_REQ_KLASS " expected");
		345
		346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		347
		348	return mg ? (aio_req)mg->mg_ptr : 0;
		349	}
		350
		351	static void aio_grp_feed (aio_req grp)
		352	{
		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	}
		379	}
		380	}
		381
		382	static void aio_grp_dec (aio_req grp)
		383	{
		384	--grp->size;
		385
		386	/* call feeder, if applicable */
		387	aio_grp_feed (grp);
		388
		389	/* finish, if done */
		390	if (!grp->size && grp->int1)
		391	{
		392	req_invoke (grp);
		393	req_free (grp);
		394	}
		395	}
		396
		397	static void req_invoke (aio_req req)
		398	{
		399	dSP;
		400
		401	if (req->flags & FLAG_SV1_RO_OFF)
		402	SvREADONLY_off (req->sv1);
		403
		404	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		405	{
		406	ENTER;
		407	SAVETMPS;
		408	PUSHMARK (SP);
		409	EXTEND (SP, 1);
		410
		411	switch (req->type)
		412	{
		413	case REQ_READDIR:
136	{	414	{
137	/* read any signals sent by the worker threads */	415	SV *rv = &PL_sv_undef;
138	char buf [32];	416
139	while (read (respipe [0], buf, 32) == 32)	417	if (req->result >= 0)
140	;	418	{
		419	int i;
		420	char *buf = req->ptr2;
		421	AV *av = newAV ();
141		422
142	rese = 0;	423	av_extend (av, req->result - 1);
		424
		425	for (i = 0; i < req->result; ++i)
		426	{
		427	SV *sv = newSVpv (buf, 0);
		428
		429	av_store (av, i, sv);
		430	buf += SvCUR (sv) + 1;
		431	}
		432
		433	rv = sv_2mortal (newRV_noinc ((SV *)av));
		434	}
		435
		436	PUSHs (rv);
143	}	437	}
144	}
145
146	pthread_mutex_unlock (&reslock);
147
148	if (!req)
149	break;	438	break;
150		439
151	nreqs--;	440	case REQ_OPEN:
152
153	if (req->type == REQ_QUIT)
154	started--;
155	else
156	{
157	int errorno = errno;
158	errno = req->errorno;
159
160	if (req->type == REQ_READ)
161	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
162
163	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
164	SvREADONLY_off (req->data);
165
166	if (req->statdata)
167	{
168	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
169	PL_laststatval = req->result;
170	PL_statcache = *(req->statdata);
171	}
172
173	ENTER;
174	PUSHMARK (SP);
175	XPUSHs (sv_2mortal (newSViv (req->result)));
176
177	if (req->type == REQ_OPEN)
178	{	441	{
179	/* convert fd to fh */	442	/* convert fd to fh */
180	SV *fh;	443	SV *fh;
181		444
		445	PUSHs (sv_2mortal (newSViv (req->result)));
182	PUTBACK;	446	PUTBACK;
183	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	447	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
184	SPAGAIN;	448	SPAGAIN;
185		449
186	fh = SvREFCNT_inc (POPs);	450	fh = SvREFCNT_inc (POPs);
187		451
188	PUSHMARK (SP);	452	PUSHMARK (SP);
189	XPUSHs (sv_2mortal (fh));	453	XPUSHs (sv_2mortal (fh));
190	}	454	}
191
192	if (SvOK (req->callback))
193	{	455	break;
194	PUTBACK;
195	call_sv (req->callback, G_VOID | G_EVAL);
196	SPAGAIN;
197		456
198	if (SvTRUE (ERRSV))	457	case REQ_GROUP:
		458	req->int1 = 2; /* mark group as finished */
		459
		460	if (req->sv1)
199	{	461	{
200	free_req (req);	462	int i;
201	croak (0);	463	AV *av = (AV *)req->sv1;
		464
		465	EXTEND (SP, AvFILL (av) + 1);
		466	for (i = 0; i <= AvFILL (av); ++i)
		467	PUSHs (*av_fetch (av, i, 0));
202	}	468	}
		469	break;
		470
		471	case REQ_NOP:
		472	case REQ_BUSY:
		473	break;
		474
		475	case REQ_READLINK:
		476	if (req->result > 0)
		477	{
		478	SvCUR_set (req->sv1, req->result);
		479	*SvEND (req->sv1) = 0;
		480	PUSHs (req->sv1);
203	}	481	}
		482	break;
204		483
205	LEAVE;	484	case REQ_STAT:
		485	case REQ_LSTAT:
		486	case REQ_FSTAT:
		487	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		488	PL_laststatval = req->result;
		489	PL_statcache = *(Stat_t *)(req->ptr2);
		490	PUSHs (sv_2mortal (newSViv (req->result)));
		491	break;
206		492
207	errno = errorno;	493	case REQ_READ:
208	count++;	494	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		495	*SvEND (req->sv1) = 0;
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
		498
		499	default:
		500	PUSHs (sv_2mortal (newSViv (req->result)));
		501	break;
209	}	502	}
210		503
211	free_req (req);	504	errno = req->errorno;
		505
		506	PUTBACK;
		507	call_sv (req->callback, G_VOID | G_EVAL);
		508	SPAGAIN;
		509
		510	FREETMPS;
		511	LEAVE;
212	}	512	}
213		513
214	return count;	514	if (req->grp)
		515	{
		516	aio_req grp = req->grp;
		517
		518	/* unlink request */
		519	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		520	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		521
		522	if (grp->grp_first == req)
		523	grp->grp_first = req->grp_next;
		524
		525	aio_grp_dec (grp);
		526	}
		527
		528	if (SvTRUE (ERRSV))
		529	{
		530	req_free (req);
		531	croak (0);
		532	}
		533	}
		534
		535	static void req_free (aio_req req)
		536	{
		537	if (req->self)
		538	{
		539	sv_unmagic (req->self, PERL_MAGIC_ext);
		540	SvREFCNT_dec (req->self);
		541	}
		542
		543	SvREFCNT_dec (req->fh);
		544	SvREFCNT_dec (req->sv1);
		545	SvREFCNT_dec (req->sv2);
		546	SvREFCNT_dec (req->callback);
		547
		548	if (req->flags & FLAG_PTR2_FREE)
		549	free (req->ptr2);
		550
		551	Safefree (req);
		552	}
		553
		554	static void req_cancel_subs (aio_req grp)
		555	{
		556	aio_req sub;
		557
		558	if (grp->type != REQ_GROUP)
		559	return;
		560
		561	SvREFCNT_dec (grp->sv2);
		562	grp->sv2 = 0;
		563
		564	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		565	req_cancel (sub);
		566	}
		567
		568	static void req_cancel (aio_req req)
		569	{
		570	req->flags |= FLAG_CANCELLED;
		571
		572	req_cancel_subs (req);
215	}	573	}
216		574
217	static void *aio_proc(void *arg);	575	static void *aio_proc(void *arg);
218		576
219	static void
220	start_thread (void)	577	static void start_thread (void)
221	{	578	{
222	sigset_t fullsigset, oldsigset;	579	sigset_t fullsigset, oldsigset;
223	pthread_t tid;
224	pthread_attr_t attr;	580	pthread_attr_t attr;
		581
		582	worker *wrk = calloc (1, sizeof (worker));
		583
		584	if (!wrk)
		585	croak ("unable to allocate worker thread data");
225		586
226	pthread_attr_init (&attr);	587	pthread_attr_init (&attr);
227	pthread_attr_setstacksize (&attr, STACKSIZE);	588	pthread_attr_setstacksize (&attr, STACKSIZE);
228	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	589	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		590	#ifdef PTHREAD_SCOPE_PROCESS
		591	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		592	#endif
229		593
230	sigfillset (&fullsigset);	594	sigfillset (&fullsigset);
		595
		596	LOCK (wrklock);
231	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	597	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
232		598
233	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	599	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
234	started++;
235
236	sigprocmask (SIG_SETMASK, &oldsigset, 0);
237	}
238
239	static void
240	send_req (aio_req req)
241	{
242	while (started < wanted && nreqs >= started)
243	start_thread ();
244
245	nreqs++;
246
247	pthread_mutex_lock (&reqlock);
248
249	req->next = 0;
250
251	if (reqe)
252	{	600	{
253	reqe->next = req;	601	wrk->prev = &wrk_first;
254	reqe = req;	602	wrk->next = wrk_first.next;
		603	wrk_first.next->prev = wrk;
		604	wrk_first.next = wrk;
		605	++started;
255	}	606	}
256	else	607	else
257	reqe = reqs = req;	608	free (wrk);
258		609
		610	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		611	UNLOCK (wrklock);
		612	}
		613
		614	static void maybe_start_thread ()
		615	{
		616	if (get_nthreads () >= wanted)
		617	return;
		618
		619	/* todo: maybe use idle here, but might be less exact */
		620	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		621	return;
		622
		623	start_thread ();
		624	}
		625
		626	static void req_send (aio_req req)
		627	{
		628	++nreqs;
		629
		630	LOCK (reqlock);
		631	++nready;
		632	reqq_push (&req_queue, req);
259	pthread_cond_signal (&reqwait);	633	pthread_cond_signal (&reqwait);
260	pthread_mutex_unlock (&reqlock);	634	UNLOCK (reqlock);
261		635
262	if (nreqs > max_outstanding)	636	maybe_start_thread ();
263	for (;;)
264	{
265	poll_cb ();
266
267	if (nreqs <= max_outstanding)
268	break;
269
270	poll_wait ();
271	}
272	}	637	}
273		638
274	static void	639	static void end_thread (void)
275	end_thread (void)
276	{	640	{
277	aio_req req;	641	aio_req req;
		642
278	Newz (0, req, 1, aio_cb);	643	Newz (0, req, 1, aio_cb);
		644
279	req->type = REQ_QUIT;	645	req->type = REQ_QUIT;
		646	req->pri = PRI_MAX + PRI_BIAS;
280		647
281	send_req (req);	648	LOCK (reqlock);
		649	reqq_push (&req_queue, req);
		650	pthread_cond_signal (&reqwait);
		651	UNLOCK (reqlock);
		652
		653	LOCK (wrklock);
		654	--started;
		655	UNLOCK (wrklock);
		656	}
		657
		658	static void set_max_idle (int nthreads)
		659	{
		660	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		661	max_idle = nthreads <= 0 ? 1 : nthreads;
		662	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
282	}	663	}
283		664
284	static void min_parallel (int nthreads)	665	static void min_parallel (int nthreads)
285	{	666	{
286	if (wanted < nthreads)	667	if (wanted < nthreads)
287	wanted = nthreads;	668	wanted = nthreads;
288	}	669	}
289		670
290	static void max_parallel (int nthreads)	671	static void max_parallel (int nthreads)
291	{	672	{
292	int cur = started;
293
294	if (wanted > nthreads)	673	if (wanted > nthreads)
295	wanted = nthreads;	674	wanted = nthreads;
296		675
297	while (cur > wanted)	676	while (started > wanted)
		677	end_thread ();
		678	}
		679
		680	static void poll_wait ()
		681	{
		682	fd_set rfd;
		683
		684	while (nreqs)
298	{	685	{
		686	int size;
		687	if (WORDACCESS_UNSAFE) LOCK (reslock);
		688	size = res_queue.size;
		689	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		690
		691	if (size)
		692	return;
		693
299	end_thread ();	694	maybe_start_thread ();
300	cur--;	695
		696	FD_ZERO(&rfd);
		697	FD_SET(respipe [0], &rfd);
		698
		699	select (respipe [0] + 1, &rfd, 0, 0, 0);
301	}	700	}
		701	}
302		702
303	while (started > wanted)	703	static int poll_cb ()
		704	{
		705	dSP;
		706	int count = 0;
		707	int maxreqs = max_poll_reqs;
		708	int do_croak = 0;
		709	struct timeval tv_start, tv_now;
		710	aio_req req;
		711
		712	if (max_poll_time)
		713	gettimeofday (&tv_start, 0);
		714
		715	for (;;)
304	{	716	{
		717	for (;;)
		718	{
		719	maybe_start_thread ();
		720
		721	LOCK (reslock);
		722	req = reqq_shift (&res_queue);
		723
		724	if (req)
		725	{
		726	--npending;
		727
		728	if (!res_queue.size)
		729	{
		730	/* read any signals sent by the worker threads */
		731	char buf [32];
		732	while (read (respipe [0], buf, 32) == 32)
		733	;
		734	}
		735	}
		736
		737	UNLOCK (reslock);
		738
		739	if (!req)
		740	break;
		741
		742	--nreqs;
		743
		744	if (req->type == REQ_GROUP && req->size)
		745	{
		746	req->int1 = 1; /* mark request as delayed */
		747	continue;
		748	}
		749	else
		750	{
		751	req_invoke (req);
		752
		753	count++;
		754	}
		755
		756	req_free (req);
		757
		758	if (maxreqs && !--maxreqs)
		759	break;
		760
		761	if (max_poll_time)
		762	{
		763	gettimeofday (&tv_now, 0);
		764
		765	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		766	break;
		767	}
		768	}
		769
		770	if (nreqs <= max_outstanding)
		771	break;
		772
305	poll_wait ();	773	poll_wait ();
306	poll_cb ();	774
		775	++maxreqs;
307	}	776	}
		777
		778	return count;
308	}	779	}
309		780
310	static void create_pipe ()	781	static void create_pipe ()
311	{	782	{
312	if (pipe (respipe))	783	if (pipe (respipe))
…		…
316	croak ("cannot set result pipe to nonblocking mode");	787	croak ("cannot set result pipe to nonblocking mode");
317		788
318	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	789	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
319	croak ("cannot set result pipe to nonblocking mode");	790	croak ("cannot set result pipe to nonblocking mode");
320	}	791	}
321
322	static void atfork_prepare (void)
323	{
324	pthread_mutex_lock (&reqlock);
325	pthread_mutex_lock (&reslock);
326	}
327
328	static void atfork_parent (void)
329	{
330	pthread_mutex_unlock (&reslock);
331	pthread_mutex_unlock (&reqlock);
332	}
333
334	static void atfork_child (void)
335	{
336	aio_req prv;
337
338	started = 0;
339
340	while (reqs)
341	{
342	prv = reqs;
343	reqs = prv->next;
344	free_req (prv);
345	}
346
347	reqs = reqe = 0;
348
349	while (ress)
350	{
351	prv = ress;
352	ress = prv->next;
353	free_req (prv);
354	}
355
356	ress = rese = 0;
357
358	close (respipe [0]);
359	close (respipe [1]);
360	create_pipe ();
361
362	atfork_parent ();
363	}
364
365	/* currently noops */
366	#define LOCK_FD(fd) do { } while (0)
367	#define UNLOCK_FD(fd) do { } while (0)
368		792
369	/*****************************************************************************/	793	/*****************************************************************************/
370	/* work around various missing functions */	794	/* work around various missing functions */
371		795
372	#if !HAVE_PREADWRITE	796	#if !HAVE_PREADWRITE
…		…
376	/*	800	/*
377	* make our pread/pwrite safe against themselves, but not against	801	* make our pread/pwrite safe against themselves, but not against
378	* normal read/write by using a mutex. slows down execution a lot,	802	* normal read/write by using a mutex. slows down execution a lot,
379	* but that's your problem, not mine.	803	* but that's your problem, not mine.
380	*/	804	*/
381	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	805	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
382		806
383	static ssize_t	807	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
384	pread (int fd, void *buf, size_t count, off_t offset)
385	{	808	{
386	ssize_t res;	809	ssize_t res;
387	off_t ooffset;	810	off_t ooffset;
388		811
389	LOCK_FD (fd);	812	LOCK (preadwritelock);
390	pthread_mutex_lock (&iolock); /* replace by LOCK_FD and private buffer */
391	ooffset = lseek (fd, 0, SEEK_CUR);	813	ooffset = lseek (fd, 0, SEEK_CUR);
392	lseek (fd, offset, SEEK_SET);	814	lseek (fd, offset, SEEK_SET);
393	res = read (fd, buf, count);	815	res = read (fd, buf, count);
394	lseek (fd, ooffset, SEEK_SET);	816	lseek (fd, ooffset, SEEK_SET);
395	pthread_mutex_unlock (&iolock);	817	UNLOCK (preadwritelock);
396	UNLOCK_FD (d);
397		818
398	return res;	819	return res;
399	}	820	}
400		821
401	static ssize_t
402	pwrite (int fd, void *buf, size_t count, off_t offset)	822	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
403	{	823	{
404	ssize_t res;	824	ssize_t res;
405	off_t ooffset;	825	off_t ooffset;
406		826
407	LOCK_FD (fd);	827	LOCK (preadwritelock);
408	pthread_mutex_lock (&iolock); /* replace by LOCK_FD and private buffer */
409	ooffset = lseek (fd, 0, SEEK_CUR);	828	ooffset = lseek (fd, 0, SEEK_CUR);
410	lseek (fd, offset, SEEK_SET);	829	lseek (fd, offset, SEEK_SET);
411	res = write (fd, buf, count);	830	res = write (fd, buf, count);
412	lseek (fd, offset, SEEK_SET);	831	lseek (fd, offset, SEEK_SET);
413	pthread_mutex_unlock (&iolock);	832	UNLOCK (preadwritelock);
414	UNLOCK_FD (d);
415		833
416	return res;	834	return res;
417	}	835	}
418	#endif	836	#endif
419		837
420	#if !HAVE_FDATASYNC	838	#if !HAVE_FDATASYNC
421	# define fdatasync fsync	839	# define fdatasync fsync
422	#endif	840	#endif
423		841
424	#if !HAVE_READAHEAD	842	#if !HAVE_READAHEAD
425	# define readahead aio_readahead	843	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
426		844
427	static char readahead_buf[4096];	845	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
428
429	static ssize_t
430	readahead (int fd, off_t offset, size_t count)
431	{	846	{
		847	dBUF;
		848
432	while (count > 0)	849	while (count > 0)
433	{	850	{
434	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	851	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
435		852
436	pread (fd, readahead_buf, len, offset);	853	pread (fd, aio_buf, len, offset);
437	offset += len;	854	offset += len;
438	count -= len;	855	count -= len;
439	}	856	}
440		857
441	errno = 0;	858	errno = 0;
442	}	859	}
		860
443	#endif	861	#endif
444		862
		863	#if !HAVE_READDIR_R
		864	# define readdir_r aio_readdir_r
		865
		866	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		867
		868	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		869	{
		870	struct dirent *e;
		871	int errorno;
		872
		873	LOCK (readdirlock);
		874
		875	e = readdir (dirp);
		876	errorno = errno;
		877
		878	if (e)
		879	{
		880	*res = ent;
		881	strcpy (ent->d_name, e->d_name);
		882	}
		883	else
		884	*res = 0;
		885
		886	UNLOCK (readdirlock);
		887
		888	errno = errorno;
		889	return e ? 0 : -1;
		890	}
		891	#endif
		892
445	/* sendfile always needs emulation */	893	/* sendfile always needs emulation */
446	static ssize_t
447	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	894	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
448	{	895	{
449	ssize_t res;	896	ssize_t res;
450		897
451	if (!count)	898	if (!count)
452	return 0;	899	return 0;
453
454	LOCK_FD (ofd);
455		900
456	#if HAVE_SENDFILE	901	#if HAVE_SENDFILE
457	# if __linux	902	# if __linux
458	res = sendfile (ofd, ifd, &offset, count);	903	res = sendfile (ofd, ifd, &offset, count);
459		904
460	# elif __freebsd	905	# elif __freebsd
461	/*	906	/*
462	* Of course, the freebsd sendfile is a dire hack with no thoughts	907	* Of course, the freebsd sendfile is a dire hack with no thoughts
463	* wasted on making it similar to other I/O functions.	908	* wasted on making it similar to other I/O functions.
464	*/	909	*/
465	{	910	{
466	off_t sbytes;	911	off_t sbytes;
467	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	912	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
468		913
469	if (res < 0 && sbytes)	914	if (res < 0 && sbytes)
470	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	915	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
471	res = sbytes;	916	res = sbytes;
472	}	917	}
473		918
474	# elif __hpux	919	# elif __hpux
475	res = sendfile (ofd, ifd, offset, count, 0, 0);	920	res = sendfile (ofd, ifd, offset, count, 0, 0);
476		921
477	# elif __solaris	922	# elif __solaris
478	{	923	{
479	struct sendfilevec vec;	924	struct sendfilevec vec;
480	size_t sbytes;	925	size_t sbytes;
481		926
482	vec.sfv_fd = ifd;	927	vec.sfv_fd = ifd;
483	vec.sfv_flag = 0;	928	vec.sfv_flag = 0;
484	vec.sfv_off = offset;	929	vec.sfv_off = offset;
485	vec.sfv_len = count;	930	vec.sfv_len = count;
486		931
487	res = sendfilev (ofd, &vec, 1, &sbytes);	932	res = sendfilev (ofd, &vec, 1, &sbytes);
488		933
489	if (res < 0 && sbytes)	934	if (res < 0 && sbytes)
490	res = sbytes;	935	res = sbytes;
491	}	936	}
492		937
493	# else
494	res = -1;
495	errno = ENOSYS;
496	# endif	938	# endif
		939	#else
		940	res = -1;
		941	errno = ENOSYS;
497	#endif	942	#endif
498		943
499	if (res < 0	944	if (res < 0
500	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK	945	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
501	#if __solaris	946	#if __solaris
502	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE	947	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
503	#endif	948	#endif
504	)	949	)
505	)	950	)
506	{	951	{
507	/* emulate sendfile. this is a major pain in the ass */	952	/* emulate sendfile. this is a major pain in the ass */
508	char *buf = malloc (4096);	953	dBUF;
		954
509	res = 0;	955	res = 0;
510		956
511	for (;;)	957	while (count)
512	{	958	{
513	ssize_t cnt;	959	ssize_t cnt;
514		960
515	cnt = pread (ifd, buf, 4096, offset);	961	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
516		962
517	if (cnt <= 0)	963	if (cnt <= 0)
518	{	964	{
519	if (cnt && !res) res = -1;	965	if (cnt && !res) res = -1;
520	break;	966	break;
521	}	967	}
522		968
523	cnt = write (ofd, buf, cnt);	969	cnt = write (ofd, aio_buf, cnt);
524		970
525	if (cnt <= 0)	971	if (cnt <= 0)
526	{	972	{
527	if (cnt && !res) res = -1;	973	if (cnt && !res) res = -1;
528	break;	974	break;
529	}	975	}
530		976
531	offset += cnt;	977	offset += cnt;
532	res += cnt;	978	res += cnt;
		979	count -= cnt;
533	}	980	}
534
535	{
536	int errorno = errno;
537	free (buf);
538	errno = errorno;
539	}
540	}	981	}
541		982
542	UNLOCK_FD (ofd);
543
544	return res;	983	return res;
		984	}
		985
		986	/* read a full directory */
		987	static void scandir_ (aio_req req, worker *self)
		988	{
		989	DIR *dirp;
		990	union
		991	{
		992	struct dirent d;
		993	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		994	} *u;
		995	struct dirent *entp;
		996	char *name, *names;
		997	int memlen = 4096;
		998	int memofs = 0;
		999	int res = 0;
		1000	int errorno;
		1001
		1002	LOCK (wrklock);
		1003	self->dirp = dirp = opendir (req->ptr1);
		1004	self->dbuf = u = malloc (sizeof (*u));
		1005	req->flags |= FLAG_PTR2_FREE;
		1006	req->ptr2 = names = malloc (memlen);
		1007	UNLOCK (wrklock);
		1008
		1009	if (dirp && u && names)
		1010	for (;;)
		1011	{
		1012	errno = 0;
		1013	readdir_r (dirp, &u->d, &entp);
		1014
		1015	if (!entp)
		1016	break;
		1017
		1018	name = entp->d_name;
		1019
		1020	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1021	{
		1022	int len = strlen (name) + 1;
		1023
		1024	res++;
		1025
		1026	while (memofs + len > memlen)
		1027	{
		1028	memlen *= 2;
		1029	LOCK (wrklock);
		1030	req->ptr2 = names = realloc (names, memlen);
		1031	UNLOCK (wrklock);
		1032
		1033	if (!names)
		1034	break;
		1035	}
		1036
		1037	memcpy (names + memofs, name, len);
		1038	memofs += len;
		1039	}
		1040	}
		1041
		1042	if (errno)
		1043	res = -1;
		1044
		1045	req->result = res;
545	}	1046	}
546		1047
547	/*****************************************************************************/	1048	/*****************************************************************************/
548		1049
549	static void *
550	aio_proc (void *thr_arg)	1050	static void *aio_proc (void *thr_arg)
551	{	1051	{
552	aio_req req;	1052	aio_req req;
553	int type;	1053	struct timespec ts;
		1054	worker *self = (worker *)thr_arg;
554		1055
555	do	1056	/* try to distribute timeouts somewhat evenly */
		1057	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1058	* (1000000000UL / 1024UL);
		1059
		1060	for (;;)
556	{	1061	{
557	pthread_mutex_lock (&reqlock);	1062	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1063
		1064	LOCK (reqlock);
558		1065
559	for (;;)	1066	for (;;)
560	{	1067	{
561	req = reqs;	1068	self->req = req = reqq_shift (&req_queue);
562
563	if (reqs)
564	{
565	reqs = reqs->next;
566	if (!reqs) reqe = 0;
567	}
568		1069
569	if (req)	1070	if (req)
570	break;	1071	break;
571		1072
		1073	++idle;
		1074
		1075	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1076	== ETIMEDOUT)
		1077	{
		1078	if (idle > max_idle)
		1079	{
		1080	--idle;
		1081	UNLOCK (reqlock);
		1082	LOCK (wrklock);
		1083	--started;
		1084	UNLOCK (wrklock);
		1085	goto quit;
		1086	}
		1087
		1088	/* we are allowed to idle, so do so without any timeout */
572	pthread_cond_wait (&reqwait, &reqlock);	1089	pthread_cond_wait (&reqwait, &reqlock);
		1090	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1091	}
		1092
		1093	--idle;
573	}	1094	}
574		1095
575	pthread_mutex_unlock (&reqlock);	1096	--nready;
		1097
		1098	UNLOCK (reqlock);
576		1099
577	errno = 0; /* strictly unnecessary */	1100	errno = 0; /* strictly unnecessary */
578		1101
579	type = req->type;	1102	if (!(req->flags & FLAG_CANCELLED))
580
581	switch (type)	1103	switch (req->type)
582	{	1104	{
583	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1105	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
584	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1106	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
585		1107
586	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1108	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
587	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1109	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
588		1110
589	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1111	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
590	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1112	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
591	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1113	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
592		1114
593	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1115	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
594	case REQ_CLOSE: req->result = close (req->fd); break;	1116	case REQ_CLOSE: req->result = close (req->int1); break;
595	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1117	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
596	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1118	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1119	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1120	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
597	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1121	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1122	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1123	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
598		1124
599	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1125	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
600	case REQ_FSYNC: req->result = fsync (req->fd); break;	1126	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1127	case REQ_READDIR: scandir_ (req, self); break;
601		1128
		1129	case REQ_BUSY:
		1130	{
		1131	struct timeval tv;
		1132
		1133	tv.tv_sec = req->int1;
		1134	tv.tv_usec = req->int2;
		1135
		1136	req->result = select (0, 0, 0, 0, &tv);
		1137	}
		1138
		1139	case REQ_GROUP:
		1140	case REQ_NOP:
		1141	break;
		1142
602	case REQ_QUIT:	1143	case REQ_QUIT:
603	break;	1144	goto quit;
604		1145
605	default:	1146	default:
606	req->result = ENOSYS;	1147	req->result = ENOSYS;
607	break;	1148	break;
608	}	1149	}
609		1150
610	req->errorno = errno;	1151	req->errorno = errno;
611		1152
612	pthread_mutex_lock (&reslock);	1153	LOCK (reslock);
613		1154
614	req->next = 0;	1155	++npending;
615		1156
616	if (rese)	1157	if (!reqq_push (&res_queue, req))
617	{
618	rese->next = req;
619	rese = req;
620	}
621	else
622	{
623	rese = ress = req;
624
625	/* write a dummy byte to the pipe so fh becomes ready */	1158	/* write a dummy byte to the pipe so fh becomes ready */
626	write (respipe [1], &respipe, 1);	1159	write (respipe [1], &respipe, 1);
627	}
628		1160
629	pthread_mutex_unlock (&reslock);	1161	self->req = 0;
		1162	worker_clear (self);
		1163
		1164	UNLOCK (reslock);
630	}	1165	}
631	while (type != REQ_QUIT);	1166
		1167	quit:
		1168	LOCK (wrklock);
		1169	worker_free (self);
		1170	UNLOCK (wrklock);
632		1171
633	return 0;	1172	return 0;
		1173	}
		1174
		1175	/*****************************************************************************/
		1176
		1177	static void atfork_prepare (void)
		1178	{
		1179	LOCK (wrklock);
		1180	LOCK (reqlock);
		1181	LOCK (reslock);
		1182	#if !HAVE_PREADWRITE
		1183	LOCK (preadwritelock);
		1184	#endif
		1185	#if !HAVE_READDIR_R
		1186	LOCK (readdirlock);
		1187	#endif
		1188	}
		1189
		1190	static void atfork_parent (void)
		1191	{
		1192	#if !HAVE_READDIR_R
		1193	UNLOCK (readdirlock);
		1194	#endif
		1195	#if !HAVE_PREADWRITE
		1196	UNLOCK (preadwritelock);
		1197	#endif
		1198	UNLOCK (reslock);
		1199	UNLOCK (reqlock);
		1200	UNLOCK (wrklock);
		1201	}
		1202
		1203	static void atfork_child (void)
		1204	{
		1205	aio_req prv;
		1206
		1207	while (prv = reqq_shift (&req_queue))
		1208	req_free (prv);
		1209
		1210	while (prv = reqq_shift (&res_queue))
		1211	req_free (prv);
		1212
		1213	while (wrk_first.next != &wrk_first)
		1214	{
		1215	worker *wrk = wrk_first.next;
		1216
		1217	if (wrk->req)
		1218	req_free (wrk->req);
		1219
		1220	worker_clear (wrk);
		1221	worker_free (wrk);
		1222	}
		1223
		1224	started = 0;
		1225	idle = 0;
		1226	nreqs = 0;
		1227	nready = 0;
		1228	npending = 0;
		1229
		1230	close (respipe [0]);
		1231	close (respipe [1]);
		1232	create_pipe ();
		1233
		1234	atfork_parent ();
634	}	1235	}
635		1236
636	#define dREQ \	1237	#define dREQ \
637	aio_req req; \	1238	aio_req req; \
		1239	int req_pri = next_pri; \
		1240	next_pri = DEFAULT_PRI + PRI_BIAS; \
638	\	1241	\
639	if (SvOK (callback) && !SvROK (callback)) \	1242	if (SvOK (callback) && !SvROK (callback)) \
640	croak ("clalback must be undef or of reference type"); \	1243	croak ("callback must be undef or of reference type"); \
641	\	1244	\
642	Newz (0, req, 1, aio_cb); \	1245	Newz (0, req, 1, aio_cb); \
643	if (!req) \	1246	if (!req) \
644	croak ("out of memory during aio_req allocation"); \	1247	croak ("out of memory during aio_req allocation"); \
645	\	1248	\
646	req->callback = newSVsv (callback);	1249	req->callback = newSVsv (callback); \
		1250	req->pri = req_pri
		1251
		1252	#define REQ_SEND \
		1253	req_send (req); \
		1254	\
		1255	if (GIMME_V != G_VOID) \
		1256	XPUSHs (req_sv (req, AIO_REQ_KLASS));
647		1257
648	MODULE = IO::AIO PACKAGE = IO::AIO	1258	MODULE = IO::AIO PACKAGE = IO::AIO
649		1259
650	PROTOTYPES: ENABLE	1260	PROTOTYPES: ENABLE
651		1261
652	BOOT:	1262	BOOT:
653	{	1263	{
		1264	HV *stash = gv_stashpv ("IO::AIO", 1);
		1265
		1266	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1267	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1268	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1269	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1270	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1271	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1272
654	create_pipe ();	1273	create_pipe ();
655	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1274	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
656	}	1275	}
657		1276
658	void	1277	void
659	min_parallel(nthreads)	1278	max_poll_reqs (int nreqs)
660	int nthreads
661	PROTOTYPE: $	1279	PROTOTYPE: $
		1280	CODE:
		1281	max_poll_reqs = nreqs;
662		1282
663	void	1283	void
664	max_parallel(nthreads)	1284	max_poll_time (double nseconds)
665	int nthreads
666	PROTOTYPE: $	1285	PROTOTYPE: $
		1286	CODE:
		1287	max_poll_time = nseconds * AIO_TICKS;
		1288
		1289	void
		1290	min_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_parallel (int nthreads)
		1295	PROTOTYPE: $
		1296
		1297	void
		1298	max_idle (int nthreads)
		1299	PROTOTYPE: $
		1300	CODE:
		1301	set_max_idle (nthreads);
667		1302
668	int	1303	int
669	max_outstanding(nreqs)	1304	max_outstanding (int maxreqs)
670	int nreqs	1305	PROTOTYPE: $
671	PROTOTYPE: $
672	CODE:	1306	CODE:
673	RETVAL = max_outstanding;	1307	RETVAL = max_outstanding;
674	max_outstanding = nreqs;	1308	max_outstanding = maxreqs;
		1309	OUTPUT:
		1310	RETVAL
675		1311
676	void	1312	void
677	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1313	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
678	SV * pathname	1314	SV * pathname
679	int flags	1315	int flags
680	int mode	1316	int mode
681	SV * callback	1317	SV * callback
682	PROTOTYPE: $$$;$	1318	PROTOTYPE: $$$;$
683	CODE:	1319	PPCODE:
684	{	1320	{
685	dREQ;	1321	dREQ;
686		1322
687	req->type = REQ_OPEN;	1323	req->type = REQ_OPEN;
688	req->data = newSVsv (pathname);	1324	req->sv1 = newSVsv (pathname);
689	req->dataptr = SvPVbyte_nolen (req->data);	1325	req->ptr1 = SvPVbyte_nolen (pathname);
690	req->fd = flags;	1326	req->int1 = flags;
691	req->mode = mode;	1327	req->mode = mode;
692		1328
693	send_req (req);	1329	REQ_SEND;
694	}	1330	}
695		1331
696	void	1332	void
697	aio_close(fh,callback=&PL_sv_undef)	1333	aio_close (fh,callback=&PL_sv_undef)
698	SV * fh	1334	SV * fh
699	SV * callback	1335	SV * callback
700	PROTOTYPE: $;$	1336	PROTOTYPE: $;$
701	ALIAS:	1337	ALIAS:
702	aio_close = REQ_CLOSE	1338	aio_close = REQ_CLOSE
703	aio_fsync = REQ_FSYNC	1339	aio_fsync = REQ_FSYNC
704	aio_fdatasync = REQ_FDATASYNC	1340	aio_fdatasync = REQ_FDATASYNC
705	CODE:	1341	PPCODE:
706	{	1342	{
707	dREQ;	1343	dREQ;
708		1344
709	req->type = ix;	1345	req->type = ix;
710	req->fh = newSVsv (fh);	1346	req->fh = newSVsv (fh);
711	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1347	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
712		1348
713	send_req (req);	1349	REQ_SEND (req);
714	}	1350	}
715		1351
716	void	1352	void
717	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1353	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
718	SV * fh	1354	SV * fh
719	UV offset	1355	UV offset
720	UV length	1356	UV length
721	SV * data	1357	SV * data
722	UV dataoffset	1358	UV dataoffset
723	SV * callback	1359	SV * callback
724	ALIAS:	1360	ALIAS:
725	aio_read = REQ_READ	1361	aio_read = REQ_READ
726	aio_write = REQ_WRITE	1362	aio_write = REQ_WRITE
727	PROTOTYPE: $$$$$;$	1363	PROTOTYPE: $$$$$;$
728	CODE:	1364	PPCODE:
729	{	1365	{
730	aio_req req;
731	STRLEN svlen;	1366	STRLEN svlen;
732	char *svptr = SvPVbyte (data, svlen);	1367	char *svptr = SvPVbyte (data, svlen);
733		1368
734	SvUPGRADE (data, SVt_PV);	1369	SvUPGRADE (data, SVt_PV);
735	SvPOK_on (data);	1370	SvPOK_on (data);
…		…
757		1392
758	{	1393	{
759	dREQ;	1394	dREQ;
760		1395
761	req->type = ix;	1396	req->type = ix;
762	req->fh = newSVsv (fh);	1397	req->fh = newSVsv (fh);
763	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1398	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
764	: IoOFP (sv_2io (fh)));	1399	: IoOFP (sv_2io (fh)));
765	req->offset = offset;	1400	req->offs = offset;
766	req->length = length;	1401	req->size = length;
767	req->data = SvREFCNT_inc (data);	1402	req->sv1 = SvREFCNT_inc (data);
768	req->dataptr = (char *)svptr + dataoffset;	1403	req->ptr1 = (char *)svptr + dataoffset;
		1404	req->stroffset = dataoffset;
769		1405
770	if (!SvREADONLY (data))	1406	if (!SvREADONLY (data))
771	{	1407	{
772	SvREADONLY_on (data);	1408	SvREADONLY_on (data);
773	req->data2ptr = (void *)data;	1409	req->flags |= FLAG_SV1_RO_OFF;
774	}	1410	}
775		1411
776	send_req (req);	1412	REQ_SEND;
777	}	1413	}
778	}	1414	}
779		1415
780	void	1416	void
		1417	aio_readlink (path,callback=&PL_sv_undef)
		1418	SV * path
		1419	SV * callback
		1420	PROTOTYPE: $$;$
		1421	PPCODE:
		1422	{
		1423	SV *data;
		1424	dREQ;
		1425
		1426	data = newSV (NAME_MAX);
		1427	SvPOK_on (data);
		1428
		1429	req->type = REQ_READLINK;
		1430	req->fh = newSVsv (path);
		1431	req->ptr2 = SvPVbyte_nolen (path);
		1432	req->sv1 = data;
		1433	req->ptr1 = SvPVbyte_nolen (data);
		1434
		1435	REQ_SEND;
		1436	}
		1437
		1438	void
781	aio_sendfile(out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1439	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
782	SV * out_fh	1440	SV * out_fh
783	SV * in_fh	1441	SV * in_fh
784	UV in_offset	1442	UV in_offset
785	UV length	1443	UV length
786	SV * callback	1444	SV * callback
787	PROTOTYPE: $$$$;$	1445	PROTOTYPE: $$$$;$
788	CODE:	1446	PPCODE:
789	{	1447	{
790	dREQ;	1448	dREQ;
791		1449
792	req->type = REQ_SENDFILE;	1450	req->type = REQ_SENDFILE;
793	req->fh = newSVsv (out_fh);	1451	req->fh = newSVsv (out_fh);
794	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1452	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
795	req->fh2 = newSVsv (in_fh);	1453	req->sv2 = newSVsv (in_fh);
796	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1454	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
797	req->offset = in_offset;	1455	req->offs = in_offset;
798	req->length = length;	1456	req->size = length;
799		1457
800	send_req (req);	1458	REQ_SEND;
801	}	1459	}
802		1460
803	void	1461	void
804	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1462	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
805	SV * fh	1463	SV * fh
806	UV offset	1464	UV offset
807	IV length	1465	IV length
808	SV * callback	1466	SV * callback
809	PROTOTYPE: $$$;$	1467	PROTOTYPE: $$$;$
810	CODE:	1468	PPCODE:
811	{	1469	{
812	dREQ;	1470	dREQ;
813		1471
814	req->type = REQ_READAHEAD;	1472	req->type = REQ_READAHEAD;
815	req->fh = newSVsv (fh);	1473	req->fh = newSVsv (fh);
816	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1474	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
817	req->offset = offset;	1475	req->offs = offset;
818	req->length = length;	1476	req->size = length;
819		1477
820	send_req (req);	1478	REQ_SEND;
821	}	1479	}
822		1480
823	void	1481	void
824	aio_stat(fh_or_path,callback=&PL_sv_undef)	1482	aio_stat (fh_or_path,callback=&PL_sv_undef)
825	SV * fh_or_path	1483	SV * fh_or_path
826	SV * callback	1484	SV * callback
827	ALIAS:	1485	ALIAS:
828	aio_stat = REQ_STAT	1486	aio_stat = REQ_STAT
829	aio_lstat = REQ_LSTAT	1487	aio_lstat = REQ_LSTAT
830	CODE:	1488	PPCODE:
831	{	1489	{
832	dREQ;	1490	dREQ;
833		1491
834	New (0, req->statdata, 1, Stat_t);	1492	req->ptr2 = malloc (sizeof (Stat_t));
835	if (!req->statdata)	1493	if (!req->ptr2)
836	{	1494	{
837	free_req (req);	1495	req_free (req);
838	croak ("out of memory during aio_req->statdata allocation");	1496	croak ("out of memory during aio_req statdata allocation");
839	}	1497	}
		1498
		1499	req->flags |= FLAG_PTR2_FREE;
840		1500
841	if (SvPOK (fh_or_path))	1501	if (SvPOK (fh_or_path))
842	{	1502	{
843	req->type = ix;	1503	req->type = ix;
844	req->data = newSVsv (fh_or_path);	1504	req->sv1 = newSVsv (fh_or_path);
845	req->dataptr = SvPVbyte_nolen (req->data);	1505	req->ptr1 = SvPVbyte_nolen (fh_or_path);
846	}	1506	}
847	else	1507	else
848	{	1508	{
849	req->type = REQ_FSTAT;	1509	req->type = REQ_FSTAT;
850	req->fh = newSVsv (fh_or_path);	1510	req->fh = newSVsv (fh_or_path);
851	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1511	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
852	}	1512	}
853		1513
854	send_req (req);	1514	REQ_SEND;
855	}	1515	}
856		1516
857	void	1517	void
858	aio_unlink(pathname,callback=&PL_sv_undef)	1518	aio_unlink (pathname,callback=&PL_sv_undef)
859	SV * pathname	1519	SV * pathname
860	SV * callback	1520	SV * callback
861	ALIAS:	1521	ALIAS:
862	aio_unlink = REQ_UNLINK	1522	aio_unlink = REQ_UNLINK
863	aio_rmdir = REQ_RMDIR	1523	aio_rmdir = REQ_RMDIR
		1524	aio_readdir = REQ_READDIR
864	CODE:	1525	PPCODE:
865	{	1526	{
866	dREQ;	1527	dREQ;
867		1528
868	req->type = ix;	1529	req->type = ix;
869	req->data = newSVsv (pathname);	1530	req->sv1 = newSVsv (pathname);
870	req->dataptr = SvPVbyte_nolen (req->data);	1531	req->ptr1 = SvPVbyte_nolen (pathname);
871
872	send_req (req);
873	}
874		1532
		1533	REQ_SEND;
		1534	}
		1535
875	void	1536	void
876	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1537	aio_link (oldpath,newpath,callback=&PL_sv_undef)
877	SV * oldpath	1538	SV * oldpath
878	SV * newpath	1539	SV * newpath
879	SV * callback	1540	SV * callback
		1541	ALIAS:
		1542	aio_link = REQ_LINK
		1543	aio_symlink = REQ_SYMLINK
		1544	aio_rename = REQ_RENAME
880	CODE:	1545	PPCODE:
881	{	1546	{
882	dREQ;	1547	dREQ;
883		1548
884	req->type = REQ_SYMLINK;	1549	req->type = ix;
885	req->fh = newSVsv (oldpath);	1550	req->fh = newSVsv (oldpath);
886	req->data2ptr = SvPVbyte_nolen (req->fh);	1551	req->ptr2 = SvPVbyte_nolen (req->fh);
887	req->data = newSVsv (newpath);	1552	req->sv1 = newSVsv (newpath);
888	req->dataptr = SvPVbyte_nolen (req->data);	1553	req->ptr1 = SvPVbyte_nolen (newpath);
889		1554
890	send_req (req);	1555	REQ_SEND;
891	}	1556	}
892		1557
893	void	1558	void
		1559	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1560	SV * pathname
		1561	SV * callback
		1562	UV mode
		1563	UV dev
		1564	PPCODE:
		1565	{
		1566	dREQ;
		1567
		1568	req->type = REQ_MKNOD;
		1569	req->sv1 = newSVsv (pathname);
		1570	req->ptr1 = SvPVbyte_nolen (pathname);
		1571	req->mode = (mode_t)mode;
		1572	req->offs = dev;
		1573
		1574	REQ_SEND;
		1575	}
		1576
		1577	void
		1578	aio_busy (delay,callback=&PL_sv_undef)
		1579	double delay
		1580	SV * callback
		1581	PPCODE:
		1582	{
		1583	dREQ;
		1584
		1585	req->type = REQ_BUSY;
		1586	req->int1 = delay < 0. ? 0 : delay;
		1587	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1588
		1589	REQ_SEND;
		1590	}
		1591
		1592	void
		1593	aio_group (callback=&PL_sv_undef)
		1594	SV * callback
		1595	PROTOTYPE: ;$
		1596	PPCODE:
		1597	{
		1598	dREQ;
		1599
		1600	req->type = REQ_GROUP;
		1601
		1602	req_send (req);
		1603	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1604	}
		1605
		1606	void
		1607	aio_nop (callback=&PL_sv_undef)
		1608	SV * callback
		1609	PPCODE:
		1610	{
		1611	dREQ;
		1612
		1613	req->type = REQ_NOP;
		1614
		1615	REQ_SEND;
		1616	}
		1617
		1618	int
		1619	aioreq_pri (int pri = 0)
		1620	PROTOTYPE: ;$
		1621	CODE:
		1622	RETVAL = next_pri - PRI_BIAS;
		1623	if (items > 0)
		1624	{
		1625	if (pri < PRI_MIN) pri = PRI_MIN;
		1626	if (pri > PRI_MAX) pri = PRI_MAX;
		1627	next_pri = pri + PRI_BIAS;
		1628	}
		1629	OUTPUT:
		1630	RETVAL
		1631
		1632	void
		1633	aioreq_nice (int nice = 0)
		1634	CODE:
		1635	nice = next_pri - nice;
		1636	if (nice < PRI_MIN) nice = PRI_MIN;
		1637	if (nice > PRI_MAX) nice = PRI_MAX;
		1638	next_pri = nice + PRI_BIAS;
		1639
		1640	void
894	flush()	1641	flush ()
895	PROTOTYPE:	1642	PROTOTYPE:
896	CODE:	1643	CODE:
897	while (nreqs)	1644	while (nreqs)
898	{	1645	{
899	poll_wait ();	1646	poll_wait ();
900	poll_cb ();	1647	poll_cb (0);
901	}	1648	}
902		1649
903	void	1650	void
904	poll()	1651	poll()
905	PROTOTYPE:	1652	PROTOTYPE:
906	CODE:	1653	CODE:
907	if (nreqs)	1654	if (nreqs)
908	{	1655	{
909	poll_wait ();	1656	poll_wait ();
910	poll_cb ();	1657	poll_cb (0);
911	}	1658	}
912		1659
913	int	1660	int
914	poll_fileno()	1661	poll_fileno()
915	PROTOTYPE:	1662	PROTOTYPE:
…		…
939	CODE:	1686	CODE:
940	RETVAL = nreqs;	1687	RETVAL = nreqs;
941	OUTPUT:	1688	OUTPUT:
942	RETVAL	1689	RETVAL
943		1690
		1691	int
		1692	nready()
		1693	PROTOTYPE:
		1694	CODE:
		1695	RETVAL = get_nready ();
		1696	OUTPUT:
		1697	RETVAL
		1698
		1699	int
		1700	npending()
		1701	PROTOTYPE:
		1702	CODE:
		1703	RETVAL = get_npending ();
		1704	OUTPUT:
		1705	RETVAL
		1706
		1707	int
		1708	nthreads()
		1709	PROTOTYPE:
		1710	CODE:
		1711	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1712	RETVAL = started;
		1713	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1714	OUTPUT:
		1715	RETVAL
		1716
		1717	PROTOTYPES: DISABLE
		1718
		1719	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1720
		1721	void
		1722	cancel (aio_req_ornot req)
		1723	CODE:
		1724	req_cancel (req);
		1725
		1726	void
		1727	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1728	CODE:
		1729	SvREFCNT_dec (req->callback);
		1730	req->callback = newSVsv (callback);
		1731
		1732	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1733
		1734	void
		1735	add (aio_req grp, ...)
		1736	PPCODE:
		1737	{
		1738	int i;
		1739	aio_req req;
		1740
		1741	if (grp->int1 == 2)
		1742	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1743
		1744	for (i = 1; i < items; ++i )
		1745	{
		1746	if (GIMME_V != G_VOID)
		1747	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1748
		1749	req = SvAIO_REQ (ST (i));
		1750
		1751	if (req)
		1752	{
		1753	++grp->size;
		1754	req->grp = grp;
		1755
		1756	req->grp_prev = 0;
		1757	req->grp_next = grp->grp_first;
		1758
		1759	if (grp->grp_first)
		1760	grp->grp_first->grp_prev = req;
		1761
		1762	grp->grp_first = req;
		1763	}
		1764	}
		1765	}
		1766
		1767	void
		1768	cancel_subs (aio_req_ornot req)
		1769	CODE:
		1770	req_cancel_subs (req);
		1771
		1772	void
		1773	result (aio_req grp, ...)
		1774	CODE:
		1775	{
		1776	int i;
		1777	AV *av;
		1778
		1779	grp->errorno = errno;
		1780
		1781	av = newAV ();
		1782
		1783	for (i = 1; i < items; ++i )
		1784	av_push (av, newSVsv (ST (i)));
		1785
		1786	SvREFCNT_dec (grp->sv1);
		1787	grp->sv1 = (SV *)av;
		1788	}
		1789
		1790	void
		1791	errno (aio_req grp, int errorno = errno)
		1792	CODE:
		1793	grp->errorno = errorno;
		1794
		1795	void
		1796	limit (aio_req grp, int limit)
		1797	CODE:
		1798	grp->int2 = limit;
		1799	aio_grp_feed (grp);
		1800
		1801	void
		1802	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1803	CODE:
		1804	{
		1805	SvREFCNT_dec (grp->sv2);
		1806	grp->sv2 = newSVsv (callback);
		1807
		1808	if (grp->int2 <= 0)
		1809	grp->int2 = 2;
		1810
		1811	aio_grp_feed (grp);
		1812	}
		1813

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