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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.43 by root, Sat Oct 21 23:06:04 2006 UTC vs.
Revision 1.77 by root, Thu Oct 26 13:25:40 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"
…		…
9		18
10	#include <pthread.h>	19	#include <pthread.h>
11		20
12	#include <stddef.h>	21	#include <stddef.h>
13	#include <errno.h>	22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
14	#include <sys/types.h>	25	#include <sys/types.h>
15	#include <sys/stat.h>	26	#include <sys/stat.h>
16	#include <limits.h>	27	#include <limits.h>
17	#include <unistd.h>	28	#include <unistd.h>
18	#include <fcntl.h>	29	#include <fcntl.h>
…		…
37	/* used for struct dirent, AIX doesn't provide it */	48	/* used for struct dirent, AIX doesn't provide it */
38	#ifndef NAME_MAX	49	#ifndef NAME_MAX
39	# define NAME_MAX 4096	50	# define NAME_MAX 4096
40	#endif	51	#endif
41		52
		53	#ifndef PTHREAD_STACK_MIN
		54	/* care for broken platforms, e.g. windows */
		55	# define PTHREAD_STACK_MIN 16384
		56	#endif
		57
42	#if __ia64	58	#if __ia64
43	# define STACKSIZE 65536	59	# define STACKSIZE 65536
		60	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		61	# define STACKSIZE PTHREAD_STACK_MIN
44	#else	62	#else
45	# define STACKSIZE 8192	63	# define STACKSIZE 16384
46	#endif	64	#endif
		65
		66	/* buffer size for various temporary buffers */
		67	#define AIO_BUFSIZE 65536
		68
		69	#define dBUF \
		70	char *aio_buf; \
		71	LOCK (wrklock); \
		72	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		73	UNLOCK (wrklock); \
		74	if (!aio_buf) \
		75	return -1;
47		76
48	enum {	77	enum {
49	REQ_QUIT,	78	REQ_QUIT,
50	REQ_OPEN, REQ_CLOSE,	79	REQ_OPEN, REQ_CLOSE,
51	REQ_READ, REQ_WRITE, REQ_READAHEAD,	80	REQ_READ, REQ_WRITE, REQ_READAHEAD,
…		…
53	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	82	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
54	REQ_FSYNC, REQ_FDATASYNC,	83	REQ_FSYNC, REQ_FDATASYNC,
55	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	84	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
56	REQ_READDIR,	85	REQ_READDIR,
57	REQ_LINK, REQ_SYMLINK,	86	REQ_LINK, REQ_SYMLINK,
		87	REQ_GROUP, REQ_NOP,
		88	REQ_BUSY,
58	};	89	};
59		90
60	#define AIO_CB_KLASS "IO::AIO::CB"	91	#define AIO_REQ_KLASS "IO::AIO::REQ"
		92	#define AIO_GRP_KLASS "IO::AIO::GRP"
61		93
62	typedef struct aio_cb	94	typedef struct aio_cb
63	{	95	{
64	struct aio_cb *grp_prev, *grp_next;
65	struct aio_grp *grp;
66
67	struct aio_cb *volatile next;	96	struct aio_cb *volatile next;
68
69	SV *self; /* the perl counterpart of this request, if any */
70		97
71	SV *data, *callback;	98	SV *data, *callback;
72	SV *fh, *fh2;	99	SV *fh, *fh2;
73	void *dataptr, *data2ptr;	100	void *dataptr, *data2ptr;
74	Stat_t *statdata;	101	Stat_t *statdata;
75	off_t offset;	102	off_t offset;
76	size_t length;	103	size_t length;
77	ssize_t result;	104	ssize_t result;
78		105
		106	STRLEN dataoffset;
79	int type;	107	int type;
80	int fd, fd2;	108	int fd, fd2;
81	int errorno;	109	int errorno;
82	STRLEN dataoffset;
83	mode_t mode; /* open */	110	mode_t mode; /* open */
		111
84	unsigned char cancelled;	112	unsigned char flags;
		113	unsigned char pri;
		114
		115	SV *self; /* the perl counterpart of this request, if any */
		116	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
85	} aio_cb;	117	} aio_cb;
		118
		119	enum {
		120	FLAG_CANCELLED = 0x01,
		121	};
86		122
87	typedef aio_cb *aio_req;	123	typedef aio_cb *aio_req;
88	typedef aio_cb *aio_req_ornot;	124	typedef aio_cb *aio_req_ornot;
89		125
		126	enum {
		127	PRI_MIN = -4,
		128	PRI_MAX = 4,
		129
		130	DEFAULT_PRI = 0,
		131	PRI_BIAS = -PRI_MIN,
		132	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		133	};
		134
		135	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		136
90	static int started, wanted;	137	static int started, wanted;
91	static volatile int nreqs;	138	static volatile int nreqs;
92	static int max_outstanding = 1<<30;
93	static int respipe [2];	139	static int respipe [2];
94		140
		141	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		142	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		143	#else
		144	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		145	#endif
		146
		147	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		148	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		149
		150	/* worker threads management */
		151	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		152
		153	typedef struct worker {
		154	/* locked by wrklock */
		155	struct worker *prev, *next;
		156
		157	pthread_t tid;
		158
		159	/* locked by reslock, reqlock or wrklock */
		160	aio_req req; /* currently processed request */
		161	void *dbuf;
		162	DIR *dirp;
		163	} worker;
		164
		165	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		166
		167	static void worker_clear (worker *wrk)
		168	{
		169	if (wrk->dirp)
		170	{
		171	closedir (wrk->dirp);
		172	wrk->dirp = 0;
		173	}
		174
		175	if (wrk->dbuf)
		176	{
		177	free (wrk->dbuf);
		178	wrk->dbuf = 0;
		179	}
		180	}
		181
		182	static void worker_free (worker *wrk)
		183	{
		184	wrk->next->prev = wrk->prev;
		185	wrk->prev->next = wrk->next;
		186
		187	free (wrk);
		188	}
		189
95	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	190	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
96	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	191	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
97	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	192	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
98		193
99	static volatile aio_req reqs, reqe; /* queue start, queue end */	194	/*
100	static volatile aio_req ress, rese; /* queue start, queue end */	195	* a somewhat faster data structure might be nice, but
101		196	* with 8 priorities this actually needs <20 insns
		197	* per shift, the most expensive operation.
		198	*/
102	typedef struct aio_grp	199	typedef struct {
103	{	200	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
104	struct aio_cb *first, *last;	201	int size;
105	SV *callback;	202	} reqq;
106	int busycount;
107	} aio_grp;
108		203
109	static void aio_grp_begin (aio_grp *grp)	204	static reqq req_queue;
110	{	205	static reqq res_queue;
111	++grp->busycount;
112	}
113		206
114	static void aio_grp_end (aio_grp *grp)	207	int reqq_push (reqq *q, aio_req req)
115	{	208	{
116	--grp->busycount;	209	int pri = req->pri;
		210	req->next = 0;
117		211
118	if (grp->busycount)	212	if (q->qe[pri])
		213	{
		214	q->qe[pri]->next = req;
		215	q->qe[pri] = req;
		216	}
		217	else
		218	q->qe[pri] = q->qs[pri] = req;
		219
		220	return q->size++;
		221	}
		222
		223	aio_req reqq_shift (reqq *q)
		224	{
		225	int pri;
		226
		227	if (!q->size)
119	return;	228	return 0;
120		229
121	SvREFCNT_dec (grp->callback);	230	--q->size;
122	grp->callback = 0;
123	}
124		231
125	static aio_grp *aio_grp_new ()	232	for (pri = NUM_PRI; pri--; )
126	{	233	{
127	aio_grp *grp;	234	aio_req req = q->qs[pri];
128		235
129	Newz (0, grp, 1, aio_grp);	236	if (req)
130	aio_grp_begin (grp);	237	{
		238	if (!(q->qs[pri] = req->next))
		239	q->qe[pri] = 0;
131		240
132	return grp;	241	return req;
		242	}
		243	}
		244
		245	abort ();
133	}	246	}
		247
		248	static int poll_cb (int max);
		249	static void req_invoke (aio_req req);
		250	static void req_free (aio_req req);
		251	static void req_cancel (aio_req req);
134		252
135	/* must be called at most once */	253	/* must be called at most once */
136	static SV *req_sv (aio_req req)	254	static SV *req_sv (aio_req req, const char *klass)
137	{	255	{
		256	if (!req->self)
		257	{
138	req->self = (SV *)newHV ();	258	req->self = (SV *)newHV ();
139	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	259	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		260	}
140		261
141	return sv_bless (newRV_noinc (req->self), gv_stashpv (AIO_CB_KLASS, 1));	262	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
142	}	263	}
143		264
144	static aio_req SvAIO_REQ (SV *sv)	265	static aio_req SvAIO_REQ (SV *sv)
145	{	266	{
		267	MAGIC *mg;
		268
146	if (!sv_derived_from (sv, AIO_CB_KLASS) || !SvROK (sv))	269	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
147	croak ("object of class " AIO_CB_KLASS " expected");	270	croak ("object of class " AIO_REQ_KLASS " expected");
148		271
149	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	272	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
150		273
151	return mg ? (aio_req)mg->mg_ptr : 0;	274	return mg ? (aio_req)mg->mg_ptr : 0;
		275	}
		276
		277	static void aio_grp_feed (aio_req grp)
		278	{
		279	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
		280	{
		281	int old_len = grp->length;
		282
		283	if (grp->fh2 && SvOK (grp->fh2))
		284	{
		285	dSP;
		286
		287	ENTER;
		288	SAVETMPS;
		289	PUSHMARK (SP);
		290	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		291	PUTBACK;
		292	call_sv (grp->fh2, G_VOID | G_EVAL | G_KEEPERR);
		293	SPAGAIN;
		294	FREETMPS;
		295	LEAVE;
		296	}
		297
		298	/* stop if no progress has been made */
		299	if (old_len == grp->length)
		300	{
		301	SvREFCNT_dec (grp->fh2);
		302	grp->fh2 = 0;
		303	break;
		304	}
		305	}
		306	}
		307
		308	static void aio_grp_dec (aio_req grp)
		309	{
		310	--grp->length;
		311
		312	/* call feeder, if applicable */
		313	aio_grp_feed (grp);
		314
		315	/* finish, if done */
		316	if (!grp->length && grp->fd)
		317	{
		318	req_invoke (grp);
		319	req_free (grp);
		320	}
		321	}
		322
		323	static void poll_wait ()
		324	{
		325	fd_set rfd;
		326
		327	while (nreqs)
		328	{
		329	int size;
		330	#if !(__i386 || __x86_64) /* safe without sempahore on these archs */
		331	LOCK (reslock);
		332	#endif
		333	size = res_queue.size;
		334	#if !(__i386 || __x86_64) /* safe without sempahore on these archs */
		335	UNLOCK (reslock);
		336	#endif
		337
		338	if (size)
		339	return;
		340
		341	FD_ZERO(&rfd);
		342	FD_SET(respipe [0], &rfd);
		343
		344	select (respipe [0] + 1, &rfd, 0, 0, 0);
		345	}
		346	}
		347
		348	static void req_invoke (aio_req req)
		349	{
		350	dSP;
		351
		352	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		353	{
		354	errno = req->errorno;
		355
		356	ENTER;
		357	SAVETMPS;
		358	PUSHMARK (SP);
		359	EXTEND (SP, 1);
		360
		361	switch (req->type)
		362	{
		363	case REQ_READDIR:
		364	{
		365	SV *rv = &PL_sv_undef;
		366
		367	if (req->result >= 0)
		368	{
		369	int i;
		370	char *buf = req->data2ptr;
		371	AV *av = newAV ();
		372
		373	av_extend (av, req->result - 1);
		374
		375	for (i = 0; i < req->result; ++i)
		376	{
		377	SV *sv = newSVpv (buf, 0);
		378
		379	av_store (av, i, sv);
		380	buf += SvCUR (sv) + 1;
		381	}
		382
		383	rv = sv_2mortal (newRV_noinc ((SV *)av));
		384	}
		385
		386	PUSHs (rv);
		387	}
		388	break;
		389
		390	case REQ_OPEN:
		391	{
		392	/* convert fd to fh */
		393	SV *fh;
		394
		395	PUSHs (sv_2mortal (newSViv (req->result)));
		396	PUTBACK;
		397	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		398	SPAGAIN;
		399
		400	fh = SvREFCNT_inc (POPs);
		401
		402	PUSHMARK (SP);
		403	XPUSHs (sv_2mortal (fh));
		404	}
		405	break;
		406
		407	case REQ_GROUP:
		408	req->fd = 2; /* mark group as finished */
		409
		410	if (req->data)
		411	{
		412	int i;
		413	AV *av = (AV *)req->data;
		414
		415	EXTEND (SP, AvFILL (av) + 1);
		416	for (i = 0; i <= AvFILL (av); ++i)
		417	PUSHs (*av_fetch (av, i, 0));
		418	}
		419	break;
		420
		421	case REQ_NOP:
		422	case REQ_BUSY:
		423	break;
		424
		425	default:
		426	PUSHs (sv_2mortal (newSViv (req->result)));
		427	break;
		428	}
		429
		430
		431	PUTBACK;
		432	call_sv (req->callback, G_VOID | G_EVAL);
		433	SPAGAIN;
		434
		435	FREETMPS;
		436	LEAVE;
		437	}
		438
		439	if (req->grp)
		440	{
		441	aio_req grp = req->grp;
		442
		443	/* unlink request */
		444	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		445	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		446
		447	if (grp->grp_first == req)
		448	grp->grp_first = req->grp_next;
		449
		450	aio_grp_dec (grp);
		451	}
		452
		453	if (SvTRUE (ERRSV))
		454	{
		455	req_free (req);
		456	croak (0);
		457	}
152	}	458	}
153		459
154	static void req_free (aio_req req)	460	static void req_free (aio_req req)
155	{	461	{
156	if (req->self)	462	if (req->self)
157	{	463	{
158	sv_unmagic (req->self, PERL_MAGIC_ext);	464	sv_unmagic (req->self, PERL_MAGIC_ext);
159	SvREFCNT_dec (req->self);	465	SvREFCNT_dec (req->self);
160	}	466	}
161		467
162	if (req->data)
163	SvREFCNT_dec (req->data);	468	SvREFCNT_dec (req->data);
164
165	if (req->fh)
166	SvREFCNT_dec (req->fh);	469	SvREFCNT_dec (req->fh);
167
168	if (req->fh2)
169	SvREFCNT_dec (req->fh2);	470	SvREFCNT_dec (req->fh2);
170
171	if (req->statdata)
172	Safefree (req->statdata);
173
174	if (req->callback)
175	SvREFCNT_dec (req->callback);	471	SvREFCNT_dec (req->callback);
		472	Safefree (req->statdata);
176		473
177	if (req->type == REQ_READDIR && req->result >= 0)	474	if (req->type == REQ_READDIR)
178	free (req->data2ptr);	475	free (req->data2ptr);
179		476
180	Safefree (req);	477	Safefree (req);
181	}	478	}
182		479
183	static void	480	static void req_cancel_subs (aio_req grp)
184	poll_wait ()
185	{	481	{
186	if (nreqs && !ress)	482	aio_req sub;
187	{
188	fd_set rfd;
189	FD_ZERO(&rfd);
190	FD_SET(respipe [0], &rfd);
191		483
192	select (respipe [0] + 1, &rfd, 0, 0, 0);	484	if (grp->type != REQ_GROUP)
193	}	485	return;
194	}
195		486
196	static int	487	SvREFCNT_dec (grp->fh2);
197	poll_cb ()	488	grp->fh2 = 0;
		489
		490	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		491	req_cancel (sub);
		492	}
		493
		494	static void req_cancel (aio_req req)
		495	{
		496	req->flags |= FLAG_CANCELLED;
		497
		498	req_cancel_subs (req);
		499	}
		500
		501	static int poll_cb (int max)
198	{	502	{
199	dSP;	503	dSP;
200	int count = 0;	504	int count = 0;
201	int do_croak = 0;	505	int do_croak = 0;
202	aio_req req;	506	aio_req req;
203		507
204	for (;;)	508	while (max <= 0 || count < max)
205	{	509	{
206	pthread_mutex_lock (&reslock);	510	LOCK (reslock);
207	req = ress;	511	req = reqq_shift (&res_queue);
208		512
209	if (req)	513	if (req)
210	{	514	{
211	ress = req->next;
212
213	if (!ress)	515	if (!res_queue.size)
214	{	516	{
215	/* read any signals sent by the worker threads */	517	/* read any signals sent by the worker threads */
216	char buf [32];	518	char buf [32];
217	while (read (respipe [0], buf, 32) == 32)	519	while (read (respipe [0], buf, 32) == 32)
218	;	520	;
219
220	rese = 0;
221	}	521	}
222	}	522	}
223		523
224	pthread_mutex_unlock (&reslock);	524	UNLOCK (reslock);
225		525
226	if (!req)	526	if (!req)
227	break;	527	break;
228		528
229	nreqs--;	529	--nreqs;
230		530
231	if (req->type == REQ_QUIT)	531	if (req->type == REQ_QUIT)
232	started--;	532	started--;
		533	else if (req->type == REQ_GROUP && req->length)
		534	{
		535	req->fd = 1; /* mark request as delayed */
		536	continue;
		537	}
233	else	538	else
234	{	539	{
235	int errorno = errno;
236	errno = req->errorno;
237
238	if (req->type == REQ_READ)	540	if (req->type == REQ_READ)
239	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));	541	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
240		542
241	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))	543	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
242	SvREADONLY_off (req->data);	544	SvREADONLY_off (req->data);
…		…
246	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	548	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
247	PL_laststatval = req->result;	549	PL_laststatval = req->result;
248	PL_statcache = *(req->statdata);	550	PL_statcache = *(req->statdata);
249	}	551	}
250		552
251	ENTER;	553	req_invoke (req);
252	PUSHMARK (SP);
253		554
254	if (req->type == REQ_READDIR)
255	{
256	SV *rv = &PL_sv_undef;
257
258	if (req->result >= 0)
259	{
260	char *buf = req->data2ptr;
261	AV *av = newAV ();
262
263	while (req->result)
264	{
265	SV *sv = newSVpv (buf, 0);
266
267	av_push (av, sv);
268	buf += SvCUR (sv) + 1;
269	req->result--;
270	}
271
272	rv = sv_2mortal (newRV_noinc ((SV *)av));
273	}
274
275	XPUSHs (rv);
276	}
277	else
278	{
279	XPUSHs (sv_2mortal (newSViv (req->result)));
280
281	if (req->type == REQ_OPEN)
282	{
283	/* convert fd to fh */
284	SV *fh;
285
286	PUTBACK;
287	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
288	SPAGAIN;
289
290	fh = SvREFCNT_inc (POPs);
291
292	PUSHMARK (SP);
293	XPUSHs (sv_2mortal (fh));
294	}
295	}
296
297	if (SvOK (req->callback) && !req->cancelled)
298	{
299	PUTBACK;
300	call_sv (req->callback, G_VOID | G_EVAL);
301	SPAGAIN;
302
303	if (SvTRUE (ERRSV))
304	{
305	req_free (req);
306	croak (0);
307	}
308	}
309
310	LEAVE;
311
312	errno = errorno;
313	count++;	555	count++;
314	}	556	}
315		557
316	req_free (req);	558	req_free (req);
317	}	559	}
…		…
319	return count;	561	return count;
320	}	562	}
321		563
322	static void *aio_proc(void *arg);	564	static void *aio_proc(void *arg);
323		565
324	static void
325	start_thread (void)	566	static void start_thread (void)
326	{	567	{
327	sigset_t fullsigset, oldsigset;	568	sigset_t fullsigset, oldsigset;
328	pthread_t tid;
329	pthread_attr_t attr;	569	pthread_attr_t attr;
		570
		571	worker *wrk = calloc (1, sizeof (worker));
		572
		573	if (!wrk)
		574	croak ("unable to allocate worker thread data");
330		575
331	pthread_attr_init (&attr);	576	pthread_attr_init (&attr);
332	pthread_attr_setstacksize (&attr, STACKSIZE);	577	pthread_attr_setstacksize (&attr, STACKSIZE);
333	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	578	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
334		579
335	sigfillset (&fullsigset);	580	sigfillset (&fullsigset);
		581
		582	LOCK (wrklock);
336	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	583	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
337		584
338	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	585	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		586	{
		587	wrk->prev = &wrk_first;
		588	wrk->next = wrk_first.next;
		589	wrk_first.next->prev = wrk;
		590	wrk_first.next = wrk;
339	started++;	591	started++;
		592	}
		593	else
		594	free (wrk);
340		595
341	sigprocmask (SIG_SETMASK, &oldsigset, 0);	596	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		597	UNLOCK (wrklock);
342	}	598	}
343		599
344	static void
345	req_send (aio_req req)	600	static void req_send (aio_req req)
346	{	601	{
347	while (started < wanted && nreqs >= started)	602	while (started < wanted && nreqs >= started)
348	start_thread ();	603	start_thread ();
349		604
350	nreqs++;	605	++nreqs;
351		606
352	pthread_mutex_lock (&reqlock);	607	LOCK (reqlock);
353		608	reqq_push (&req_queue, req);
354	req->next = 0;
355
356	if (reqe)
357	{
358	reqe->next = req;
359	reqe = req;
360	}
361	else
362	reqe = reqs = req;
363
364	pthread_cond_signal (&reqwait);	609	pthread_cond_signal (&reqwait);
365	pthread_mutex_unlock (&reqlock);	610	UNLOCK (reqlock);
366
367	if (nreqs > max_outstanding)
368	for (;;)
369	{
370	poll_cb ();
371
372	if (nreqs <= max_outstanding)
373	break;
374
375	poll_wait ();
376	}
377	}	611	}
378		612
379	static void	613	static void end_thread (void)
380	end_thread (void)
381	{	614	{
382	aio_req req;	615	aio_req req;
		616
383	Newz (0, req, 1, aio_cb);	617	Newz (0, req, 1, aio_cb);
		618
384	req->type = REQ_QUIT;	619	req->type = REQ_QUIT;
		620	req->pri = PRI_MAX + PRI_BIAS;
385		621
386	req_send (req);	622	req_send (req);
387	}	623	}
388		624
389	static void min_parallel (int nthreads)	625	static void min_parallel (int nthreads)
…		…
406	}	642	}
407		643
408	while (started > wanted)	644	while (started > wanted)
409	{	645	{
410	poll_wait ();	646	poll_wait ();
411	poll_cb ();	647	poll_cb (0);
412	}	648	}
413	}	649	}
414		650
415	static void create_pipe ()	651	static void create_pipe ()
416	{	652	{
…		…
436	* normal read/write by using a mutex. slows down execution a lot,	672	* normal read/write by using a mutex. slows down execution a lot,
437	* but that's your problem, not mine.	673	* but that's your problem, not mine.
438	*/	674	*/
439	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	675	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
440		676
441	static ssize_t	677	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
442	pread (int fd, void *buf, size_t count, off_t offset)
443	{	678	{
444	ssize_t res;	679	ssize_t res;
445	off_t ooffset;	680	off_t ooffset;
446		681
447	pthread_mutex_lock (&preadwritelock);	682	LOCK (preadwritelock);
448	ooffset = lseek (fd, 0, SEEK_CUR);	683	ooffset = lseek (fd, 0, SEEK_CUR);
449	lseek (fd, offset, SEEK_SET);	684	lseek (fd, offset, SEEK_SET);
450	res = read (fd, buf, count);	685	res = read (fd, buf, count);
451	lseek (fd, ooffset, SEEK_SET);	686	lseek (fd, ooffset, SEEK_SET);
452	pthread_mutex_unlock (&preadwritelock);	687	UNLOCK (preadwritelock);
453		688
454	return res;	689	return res;
455	}	690	}
456		691
457	static ssize_t
458	pwrite (int fd, void *buf, size_t count, off_t offset)	692	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
459	{	693	{
460	ssize_t res;	694	ssize_t res;
461	off_t ooffset;	695	off_t ooffset;
462		696
463	pthread_mutex_lock (&preadwritelock);	697	LOCK (preadwritelock);
464	ooffset = lseek (fd, 0, SEEK_CUR);	698	ooffset = lseek (fd, 0, SEEK_CUR);
465	lseek (fd, offset, SEEK_SET);	699	lseek (fd, offset, SEEK_SET);
466	res = write (fd, buf, count);	700	res = write (fd, buf, count);
467	lseek (fd, offset, SEEK_SET);	701	lseek (fd, offset, SEEK_SET);
468	pthread_mutex_unlock (&preadwritelock);	702	UNLOCK (preadwritelock);
469		703
470	return res;	704	return res;
471	}	705	}
472	#endif	706	#endif
473		707
474	#if !HAVE_FDATASYNC	708	#if !HAVE_FDATASYNC
475	# define fdatasync fsync	709	# define fdatasync fsync
476	#endif	710	#endif
477		711
478	#if !HAVE_READAHEAD	712	#if !HAVE_READAHEAD
479	# define readahead aio_readahead	713	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
480		714
481	static ssize_t	715	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
482	readahead (int fd, off_t offset, size_t count)
483	{	716	{
484	char readahead_buf[4096];	717	dBUF;
485		718
486	while (count > 0)	719	while (count > 0)
487	{	720	{
488	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	721	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
489		722
490	pread (fd, readahead_buf, len, offset);	723	pread (fd, aio_buf, len, offset);
491	offset += len;	724	offset += len;
492	count -= len;	725	count -= len;
493	}	726	}
494		727
495	errno = 0;	728	errno = 0;
496	}	729	}
		730
497	#endif	731	#endif
498		732
499	#if !HAVE_READDIR_R	733	#if !HAVE_READDIR_R
500	# define readdir_r aio_readdir_r	734	# define readdir_r aio_readdir_r
501		735
502	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	736	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
503		737
504	static int
505	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	738	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
506	{	739	{
507	struct dirent *e;	740	struct dirent *e;
508	int errorno;	741	int errorno;
509		742
510	pthread_mutex_lock (&readdirlock);	743	LOCK (readdirlock);
511		744
512	e = readdir (dirp);	745	e = readdir (dirp);
513	errorno = errno;	746	errorno = errno;
514		747
515	if (e)	748	if (e)
…		…
518	strcpy (ent->d_name, e->d_name);	751	strcpy (ent->d_name, e->d_name);
519	}	752	}
520	else	753	else
521	*res = 0;	754	*res = 0;
522		755
523	pthread_mutex_unlock (&readdirlock);	756	UNLOCK (readdirlock);
524		757
525	errno = errorno;	758	errno = errorno;
526	return e ? 0 : -1;	759	return e ? 0 : -1;
527	}	760	}
528	#endif	761	#endif
529		762
530	/* sendfile always needs emulation */	763	/* sendfile always needs emulation */
531	static ssize_t
532	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	764	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
533	{	765	{
534	ssize_t res;	766	ssize_t res;
535		767
536	if (!count)	768	if (!count)
537	return 0;	769	return 0;
…		…
548	{	780	{
549	off_t sbytes;	781	off_t sbytes;
550	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	782	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
551		783
552	if (res < 0 && sbytes)	784	if (res < 0 && sbytes)
553	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	785	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
554	res = sbytes;	786	res = sbytes;
555	}	787	}
556		788
557	# elif __hpux	789	# elif __hpux
558	res = sendfile (ofd, ifd, offset, count, 0, 0);	790	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
586	#endif	818	#endif
587	)	819	)
588	)	820	)
589	{	821	{
590	/* emulate sendfile. this is a major pain in the ass */	822	/* emulate sendfile. this is a major pain in the ass */
591	char buf[4096];	823	dBUF;
		824
592	res = 0;	825	res = 0;
593		826
594	while (count)	827	while (count)
595	{	828	{
596	ssize_t cnt;	829	ssize_t cnt;
597		830
598	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	831	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
599		832
600	if (cnt <= 0)	833	if (cnt <= 0)
601	{	834	{
602	if (cnt && !res) res = -1;	835	if (cnt && !res) res = -1;
603	break;	836	break;
604	}	837	}
605		838
606	cnt = write (ofd, buf, cnt);	839	cnt = write (ofd, aio_buf, cnt);
607		840
608	if (cnt <= 0)	841	if (cnt <= 0)
609	{	842	{
610	if (cnt && !res) res = -1;	843	if (cnt && !res) res = -1;
611	break;	844	break;
…		…
619		852
620	return res;	853	return res;
621	}	854	}
622		855
623	/* read a full directory */	856	/* read a full directory */
624	static int	857	static void scandir_ (aio_req req, worker *self)
625	scandir_ (const char *path, void **namesp)
626	{	858	{
627	DIR *dirp = opendir (path);	859	DIR *dirp;
628	union	860	union
629	{	861	{
630	struct dirent d;	862	struct dirent d;
631	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	863	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
632	} u;	864	} *u;
633	struct dirent *entp;	865	struct dirent *entp;
634	char *name, *names;	866	char *name, *names;
635	int memlen = 4096;	867	int memlen = 4096;
636	int memofs = 0;	868	int memofs = 0;
637	int res = 0;	869	int res = 0;
638	int errorno;	870	int errorno;
639		871
640	if (!dirp)	872	LOCK (wrklock);
641	return -1;	873	self->dirp = dirp = opendir (req->dataptr);
642		874	self->dbuf = u = malloc (sizeof (*u));
643	names = malloc (memlen);	875	req->data2ptr = names = malloc (memlen);
		876	UNLOCK (wrklock);
644		877
		878	if (dirp && u && names)
645	for (;;)	879	for (;;)
646	{	880	{
		881	errno = 0;
647	errno = 0, readdir_r (dirp, &u.d, &entp);	882	readdir_r (dirp, &u->d, &entp);
648		883
649	if (!entp)	884	if (!entp)
650	break;	885	break;
651		886
652	name = entp->d_name;	887	name = entp->d_name;
653		888
654	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))	889	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
655	{	890	{
656	int len = strlen (name) + 1;	891	int len = strlen (name) + 1;
657		892
658	res++;	893	res++;
659		894
660	while (memofs + len > memlen)	895	while (memofs + len > memlen)
661	{	896	{
662	memlen *= 2;	897	memlen *= 2;
		898	LOCK (wrklock);
663	names = realloc (names, memlen);	899	req->data2ptr = names = realloc (names, memlen);
		900	UNLOCK (wrklock);
		901
664	if (!names)	902	if (!names)
665	break;	903	break;
666	}	904	}
667		905
668	memcpy (names + memofs, name, len);	906	memcpy (names + memofs, name, len);
669	memofs += len;	907	memofs += len;
670	}	908	}
671	}	909	}
672		910
673	errorno = errno;
674	closedir (dirp);
675
676	if (errorno)	911	if (errno)
677	{
678	free (names);
679	errno = errorno;
680	res = -1;	912	res = -1;
681	}	913
682		914	req->result = res;
683	*namesp = (void *)names;
684	return res;
685	}	915	}
686		916
687	/*****************************************************************************/	917	/*****************************************************************************/
688		918
689	static void *
690	aio_proc (void *thr_arg)	919	static void *aio_proc (void *thr_arg)
691	{	920	{
692	aio_req req;	921	aio_req req;
693	int type;	922	int type;
		923	worker *self = (worker *)thr_arg;
694		924
695	do	925	do
696	{	926	{
697	pthread_mutex_lock (&reqlock);	927	LOCK (reqlock);
698		928
699	for (;;)	929	for (;;)
700	{	930	{
701	req = reqs;	931	self->req = req = reqq_shift (&req_queue);
702
703	if (reqs)
704	{
705	reqs = reqs->next;
706	if (!reqs) reqe = 0;
707	}
708		932
709	if (req)	933	if (req)
710	break;	934	break;
711		935
712	pthread_cond_wait (&reqwait, &reqlock);	936	pthread_cond_wait (&reqwait, &reqlock);
713	}	937	}
714		938
715	pthread_mutex_unlock (&reqlock);	939	UNLOCK (reqlock);
716		940
717	errno = 0; /* strictly unnecessary */	941	errno = 0; /* strictly unnecessary */
		942	type = req->type; /* remember type for QUIT check */
718		943
719	if (!req->cancelled)	944	if (!(req->flags & FLAG_CANCELLED))
720	switch (req->type)	945	switch (type)
721	{	946	{
722	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	947	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
723	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	948	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
724		949
725	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	950	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
726	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	951	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length, self); break;
727		952
728	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	953	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
729	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	954	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
730	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	955	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
731		956
…		…
737	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	962	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
738	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	963	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
739		964
740	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	965	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
741	case REQ_FSYNC: req->result = fsync (req->fd); break;	966	case REQ_FSYNC: req->result = fsync (req->fd); break;
742	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	967	case REQ_READDIR: scandir_ (req, self); break;
743		968
		969	case REQ_BUSY:
		970	{
		971	struct timeval tv;
		972
		973	tv.tv_sec = req->fd;
		974	tv.tv_usec = req->fd2;
		975
		976	req->result = select (0, 0, 0, 0, &tv);
		977	}
		978
		979	case REQ_GROUP:
		980	case REQ_NOP:
744	case REQ_QUIT:	981	case REQ_QUIT:
745	break;	982	break;
746		983
747	default:	984	default:
748	req->result = ENOSYS;	985	req->result = ENOSYS;
749	break;	986	break;
750	}	987	}
751		988
752	req->errorno = errno;	989	req->errorno = errno;
753		990
754	pthread_mutex_lock (&reslock);	991	LOCK (reslock);
755		992
756	req->next = 0;	993	if (!reqq_push (&res_queue, req))
757
758	if (rese)
759	{
760	rese->next = req;
761	rese = req;
762	}
763	else
764	{
765	rese = ress = req;
766
767	/* write a dummy byte to the pipe so fh becomes ready */	994	/* write a dummy byte to the pipe so fh becomes ready */
768	write (respipe [1], &respipe, 1);	995	write (respipe [1], &respipe, 1);
769	}
770		996
771	pthread_mutex_unlock (&reslock);	997	self->req = 0;
		998	worker_clear (self);
		999
		1000	UNLOCK (reslock);
772	}	1001	}
773	while (type != REQ_QUIT);	1002	while (type != REQ_QUIT);
774		1003
		1004	LOCK (wrklock);
		1005	worker_free (self);
		1006	UNLOCK (wrklock);
		1007
775	return 0;	1008	return 0;
776	}	1009	}
777		1010
778	/*****************************************************************************/	1011	/*****************************************************************************/
779		1012
780	static void atfork_prepare (void)	1013	static void atfork_prepare (void)
781	{	1014	{
782	pthread_mutex_lock (&reqlock);	1015	LOCK (wrklock);
783	pthread_mutex_lock (&reslock);	1016	LOCK (reqlock);
		1017	LOCK (reslock);
784	#if !HAVE_PREADWRITE	1018	#if !HAVE_PREADWRITE
785	pthread_mutex_lock (&preadwritelock);	1019	LOCK (preadwritelock);
786	#endif	1020	#endif
787	#if !HAVE_READDIR_R	1021	#if !HAVE_READDIR_R
788	pthread_mutex_lock (&readdirlock);	1022	LOCK (readdirlock);
789	#endif	1023	#endif
790	}	1024	}
791		1025
792	static void atfork_parent (void)	1026	static void atfork_parent (void)
793	{	1027	{
794	#if !HAVE_READDIR_R	1028	#if !HAVE_READDIR_R
795	pthread_mutex_unlock (&readdirlock);	1029	UNLOCK (readdirlock);
796	#endif	1030	#endif
797	#if !HAVE_PREADWRITE	1031	#if !HAVE_PREADWRITE
798	pthread_mutex_unlock (&preadwritelock);	1032	UNLOCK (preadwritelock);
799	#endif	1033	#endif
800	pthread_mutex_unlock (&reslock);	1034	UNLOCK (reslock);
801	pthread_mutex_unlock (&reqlock);	1035	UNLOCK (reqlock);
		1036	UNLOCK (wrklock);
802	}	1037	}
803		1038
804	static void atfork_child (void)	1039	static void atfork_child (void)
805	{	1040	{
806	aio_req prv;	1041	aio_req prv;
807		1042
		1043	while (prv = reqq_shift (&req_queue))
		1044	req_free (prv);
		1045
		1046	while (prv = reqq_shift (&res_queue))
		1047	req_free (prv);
		1048
		1049	while (wrk_first.next != &wrk_first)
		1050	{
		1051	worker *wrk = wrk_first.next;
		1052
		1053	if (wrk->req)
		1054	req_free (wrk->req);
		1055
		1056	worker_clear (wrk);
		1057	worker_free (wrk);
		1058	}
		1059
808	started = 0;	1060	started = 0;
809		1061	nreqs = 0;
810	while (reqs)
811	{
812	prv = reqs;
813	reqs = prv->next;
814	req_free (prv);
815	}
816
817	reqs = reqe = 0;
818
819	while (ress)
820	{
821	prv = ress;
822	ress = prv->next;
823	req_free (prv);
824	}
825
826	ress = rese = 0;
827		1062
828	close (respipe [0]);	1063	close (respipe [0]);
829	close (respipe [1]);	1064	close (respipe [1]);
830	create_pipe ();	1065	create_pipe ();
831		1066
832	atfork_parent ();	1067	atfork_parent ();
833	}	1068	}
834		1069
835	#define dREQ \	1070	#define dREQ \
836	aio_req req; \	1071	aio_req req; \
		1072	int req_pri = next_pri; \
		1073	next_pri = DEFAULT_PRI + PRI_BIAS; \
837	\	1074	\
838	if (SvOK (callback) && !SvROK (callback)) \	1075	if (SvOK (callback) && !SvROK (callback)) \
839	croak ("callback must be undef or of reference type"); \	1076	croak ("callback must be undef or of reference type"); \
840	\	1077	\
841	Newz (0, req, 1, aio_cb); \	1078	Newz (0, req, 1, aio_cb); \
842	if (!req) \	1079	if (!req) \
843	croak ("out of memory during aio_req allocation"); \	1080	croak ("out of memory during aio_req allocation"); \
844	\	1081	\
845	req->callback = newSVsv (callback)	1082	req->callback = newSVsv (callback); \
		1083	req->pri = req_pri
846		1084
847	#define REQ_SEND \	1085	#define REQ_SEND \
848	req_send (req); \	1086	req_send (req); \
849	\	1087	\
850	if (GIMME_V != G_VOID) \	1088	if (GIMME_V != G_VOID) \
851	XPUSHs (req_sv (req));	1089	XPUSHs (req_sv (req, AIO_REQ_KLASS));
852		1090
853	MODULE = IO::AIO PACKAGE = IO::AIO	1091	MODULE = IO::AIO PACKAGE = IO::AIO
854		1092
855	PROTOTYPES: ENABLE	1093	PROTOTYPES: ENABLE
856		1094
…		…
872		1110
873	void	1111	void
874	max_parallel (nthreads)	1112	max_parallel (nthreads)
875	int nthreads	1113	int nthreads
876	PROTOTYPE: $	1114	PROTOTYPE: $
877
878	int
879	max_outstanding (nreqs)
880	int nreqs
881	PROTOTYPE: $
882	CODE:
883	RETVAL = max_outstanding;
884	max_outstanding = nreqs;
885		1115
886	void	1116	void
887	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1117	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
888	SV * pathname	1118	SV * pathname
889	int flags	1119	int flags
…		…
1103	req->dataptr = SvPVbyte_nolen (req->data);	1333	req->dataptr = SvPVbyte_nolen (req->data);
1104		1334
1105	REQ_SEND;	1335	REQ_SEND;
1106	}	1336	}
1107		1337
1108	#if 0
1109
1110	# undocumented, because it does not cancel active requests
1111	void	1338	void
1112	cancel_most_requests ()	1339	aio_busy (delay,callback=&PL_sv_undef)
		1340	double delay
		1341	SV * callback
		1342	PPCODE:
		1343	{
		1344	dREQ;
		1345
		1346	req->type = REQ_BUSY;
		1347	req->fd = delay < 0. ? 0 : delay;
		1348	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1349
		1350	REQ_SEND;
		1351	}
		1352
		1353	void
		1354	aio_group (callback=&PL_sv_undef)
		1355	SV * callback
1113	PROTOTYPE:	1356	PROTOTYPE: ;$
1114	CODE:	1357	PPCODE:
1115	{	1358	{
1116	aio_req *req;	1359	dREQ;
1117		1360
1118	pthread_mutex_lock (&reqlock);	1361	req->type = REQ_GROUP;
1119	for (req = reqs; req; req = req->next)	1362	req_send (req);
1120	req->flags |= 1;
1121	pthread_mutex_unlock (&reqlock);
1122		1363
1123	pthread_mutex_lock (&reslock);	1364	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1124	for (req = ress; req; req = req->next)
1125	req->flags |= 1;
1126	pthread_mutex_unlock (&reslock);
1127	}	1365	}
1128		1366
1129	#endif	1367	void
		1368	aio_nop (callback=&PL_sv_undef)
		1369	SV * callback
		1370	PPCODE:
		1371	{
		1372	dREQ;
		1373
		1374	req->type = REQ_NOP;
		1375
		1376	REQ_SEND;
		1377	}
		1378
		1379	void
		1380	aioreq_pri (int pri = DEFAULT_PRI)
		1381	CODE:
		1382	if (pri < PRI_MIN) pri = PRI_MIN;
		1383	if (pri > PRI_MAX) pri = PRI_MAX;
		1384	next_pri = pri + PRI_BIAS;
		1385
		1386	void
		1387	aioreq_nice (int nice = 0)
		1388	CODE:
		1389	nice = next_pri - nice;
		1390	if (nice < PRI_MIN) nice = PRI_MIN;
		1391	if (nice > PRI_MAX) nice = PRI_MAX;
		1392	next_pri = nice + PRI_BIAS;
1130		1393
1131	void	1394	void
1132	flush ()	1395	flush ()
1133	PROTOTYPE:	1396	PROTOTYPE:
1134	CODE:	1397	CODE:
1135	while (nreqs)	1398	while (nreqs)
1136	{	1399	{
1137	poll_wait ();	1400	poll_wait ();
1138	poll_cb ();	1401	poll_cb (0);
1139	}	1402	}
1140		1403
1141	void	1404	void
1142	poll()	1405	poll()
1143	PROTOTYPE:	1406	PROTOTYPE:
1144	CODE:	1407	CODE:
1145	if (nreqs)	1408	if (nreqs)
1146	{	1409	{
1147	poll_wait ();	1410	poll_wait ();
1148	poll_cb ();	1411	poll_cb (0);
1149	}	1412	}
1150		1413
1151	int	1414	int
1152	poll_fileno()	1415	poll_fileno()
1153	PROTOTYPE:	1416	PROTOTYPE:
…		…
1158		1421
1159	int	1422	int
1160	poll_cb(...)	1423	poll_cb(...)
1161	PROTOTYPE:	1424	PROTOTYPE:
1162	CODE:	1425	CODE:
1163	RETVAL = poll_cb ();	1426	RETVAL = poll_cb (0);
		1427	OUTPUT:
		1428	RETVAL
		1429
		1430	int
		1431	poll_some(int max = 0)
		1432	PROTOTYPE: $
		1433	CODE:
		1434	RETVAL = poll_cb (max);
1164	OUTPUT:	1435	OUTPUT:
1165	RETVAL	1436	RETVAL
1166		1437
1167	void	1438	void
1168	poll_wait()	1439	poll_wait()
…		…
1177	CODE:	1448	CODE:
1178	RETVAL = nreqs;	1449	RETVAL = nreqs;
1179	OUTPUT:	1450	OUTPUT:
1180	RETVAL	1451	RETVAL
1181		1452
		1453	PROTOTYPES: DISABLE
		1454
1182	MODULE = IO::AIO PACKAGE = IO::AIO::CB	1455	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1183		1456
1184	void	1457	void
1185	cancel (aio_req_ornot req)	1458	cancel (aio_req_ornot req)
1186	PROTOTYPE:
1187	CODE:	1459	CODE:
1188	req->cancelled = 1;	1460	req_cancel (req);
1189		1461
		1462	void
		1463	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1464	CODE:
		1465	SvREFCNT_dec (req->callback);
		1466	req->callback = newSVsv (callback);
		1467
		1468	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1469
		1470	void
		1471	add (aio_req grp, ...)
		1472	PPCODE:
		1473	{
		1474	int i;
		1475	aio_req req;
		1476
		1477	if (grp->fd == 2)
		1478	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1479
		1480	for (i = 1; i < items; ++i )
		1481	{
		1482	if (GIMME_V != G_VOID)
		1483	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1484
		1485	req = SvAIO_REQ (ST (i));
		1486
		1487	if (req)
		1488	{
		1489	++grp->length;
		1490	req->grp = grp;
		1491
		1492	req->grp_prev = 0;
		1493	req->grp_next = grp->grp_first;
		1494
		1495	if (grp->grp_first)
		1496	grp->grp_first->grp_prev = req;
		1497
		1498	grp->grp_first = req;
		1499	}
		1500	}
		1501	}
		1502
		1503	void
		1504	cancel_subs (aio_req_ornot req)
		1505	CODE:
		1506	req_cancel_subs (req);
		1507
		1508	void
		1509	result (aio_req grp, ...)
		1510	CODE:
		1511	{
		1512	int i;
		1513	AV *av = newAV ();
		1514
		1515	for (i = 1; i < items; ++i )
		1516	av_push (av, newSVsv (ST (i)));
		1517
		1518	SvREFCNT_dec (grp->data);
		1519	grp->data = (SV *)av;
		1520	}
		1521
		1522	void
		1523	limit (aio_req grp, int limit)
		1524	CODE:
		1525	grp->fd2 = limit;
		1526	aio_grp_feed (grp);
		1527
		1528	void
		1529	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1530	CODE:
		1531	{
		1532	SvREFCNT_dec (grp->fh2);
		1533	grp->fh2 = newSVsv (callback);
		1534
		1535	if (grp->fd2 <= 0)
		1536	grp->fd2 = 2;
		1537
		1538	aio_grp_feed (grp);
		1539	}
		1540

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