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Comparing libeio/eio.c (file contents):
Revision 1.6 by root, Sun May 11 19:11:05 2008 UTC vs.
Revision 1.23 by root, Sun Sep 21 00:23:45 2008 UTC

		1	/*
		2	* libeio implementation
		3	*
		4	* Copyright (c) 2007,2008 Marc Alexander Lehmann <libeio@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without modifica-
		8	* tion, are permitted provided that the following conditions are met:
		9	*
		10	* 1. Redistributions of source code must retain the above copyright notice,
		11	* this list of conditions and the following disclaimer.
		12	*
		13	* 2. Redistributions in binary form must reproduce the above copyright
		14	* notice, this list of conditions and the following disclaimer in the
		15	* documentation and/or other materials provided with the distribution.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
		18	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
		19	* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
		20	* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
		21	* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
		22	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
		23	* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
		24	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
		25	* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
		26	* OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*
		28	* Alternatively, the contents of this file may be used under the terms of
		29	* the GNU General Public License ("GPL") version 2 or any later version,
		30	* in which case the provisions of the GPL are applicable instead of
		31	* the above. If you wish to allow the use of your version of this file
		32	* only under the terms of the GPL and not to allow others to use your
		33	* version of this file under the BSD license, indicate your decision
		34	* by deleting the provisions above and replace them with the notice
		35	* and other provisions required by the GPL. If you do not delete the
		36	* provisions above, a recipient may use your version of this file under
		37	* either the BSD or the GPL.
		38	*/
		39
1	#include "eio.h"	40	#include "eio.h"
2	#include "xthread.h"	41	#include "xthread.h"
3		42
4	#include <errno.h>	43	#include <errno.h>
5	#include <stddef.h>	44	#include <stddef.h>
…		…
8	#include <errno.h>	47	#include <errno.h>
9	#include <sys/types.h>	48	#include <sys/types.h>
10	#include <sys/stat.h>	49	#include <sys/stat.h>
11	#include <limits.h>	50	#include <limits.h>
12	#include <fcntl.h>	51	#include <fcntl.h>
13	#include <sched.h>	52	#include <assert.h>
14		53
15	#ifndef EIO_FINISH	54	#ifndef EIO_FINISH
16	# define EIO_FINISH(req) ((req)->finish) && !EIO_CANCELLED (req) ? (req)->finish (req) : 0	55	# define EIO_FINISH(req) ((req)->finish) && !EIO_CANCELLED (req) ? (req)->finish (req) : 0
17	#endif	56	#endif
18		57
…		…
41	# ifndef EIO_STRUCT_DIRENT	80	# ifndef EIO_STRUCT_DIRENT
42	# define EIO_STRUCT_DIRENT struct dirent	81	# define EIO_STRUCT_DIRENT struct dirent
43	# endif	82	# endif
44		83
45	#endif	84	#endif
46
47	# ifndef EIO_STRUCT_STAT
48	# define EIO_STRUCT_STAT struct stat
49	# endif
50		85
51	#if HAVE_SENDFILE	86	#if HAVE_SENDFILE
52	# if __linux	87	# if __linux
53	# include <sys/sendfile.h>	88	# include <sys/sendfile.h>
54	# elif __freebsd	89	# elif __freebsd
…		…
74	/* buffer size for various temporary buffers */	109	/* buffer size for various temporary buffers */
75	#define EIO_BUFSIZE 65536	110	#define EIO_BUFSIZE 65536
76		111
77	#define dBUF \	112	#define dBUF \
78	char *eio_buf; \	113	char *eio_buf; \
79	X_LOCK (wrklock); \	114	ETP_WORKER_LOCK (self); \
80	self->dbuf = eio_buf = malloc (EIO_BUFSIZE); \	115	self->dbuf = eio_buf = malloc (EIO_BUFSIZE); \
81	X_UNLOCK (wrklock); \	116	ETP_WORKER_UNLOCK (self); \
		117	errno = ENOMEM; \
82	if (!eio_buf) \	118	if (!eio_buf) \
83	return -1;	119	return -1;
84		120
85	#define EIO_TICKS ((1000000 + 1023) >> 10)	121	#define EIO_TICKS ((1000000 + 1023) >> 10)
86		122
		123	/*****************************************************************************/
		124
		125	#define ETP_PRI_MIN EIO_PRI_MIN
		126	#define ETP_PRI_MAX EIO_PRI_MAX
		127
		128	struct etp_worker;
		129
		130	#define ETP_REQ eio_req
		131	#define ETP_DESTROY(req) eio_destroy (req)
		132	static int eio_finish (eio_req *req);
		133	#define ETP_FINISH(req) eio_finish (req)
		134	static void eio_execute (struct etp_worker *self, eio_req *req);
		135	#define ETP_EXECUTE(wrk,req) eio_execute (wrk,req)
		136
		137	#define ETP_WORKER_CLEAR(req) \
		138	if (wrk->dbuf) \
		139	{ \
		140	free (wrk->dbuf); \
		141	wrk->dbuf = 0; \
		142	} \
		143	\
		144	if (wrk->dirp) \
		145	{ \
		146	closedir (wrk->dirp); \
		147	wrk->dirp = 0; \
		148	}
		149	#define ETP_WORKER_COMMON \
		150	void *dbuf; \
		151	DIR *dirp;
		152
		153	/*****************************************************************************/
		154
		155	#define ETP_NUM_PRI (ETP_PRI_MAX - ETP_PRI_MIN + 1)
		156
		157	/* calculcate time difference in ~1/EIO_TICKS of a second */
		158	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		159	{
		160	return (tv2->tv_sec - tv1->tv_sec ) * EIO_TICKS
		161	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		162	}
		163
		164	static unsigned int started, idle, wanted = 4;
		165
87	static void (*want_poll_cb) (void);	166	static void (*want_poll_cb) (void);
88	static void (*done_poll_cb) (void);	167	static void (*done_poll_cb) (void);
89		168
90	static unsigned int max_poll_time = 0;	169	static unsigned int max_poll_time; /* reslock */
91	static unsigned int max_poll_reqs = 0;	170	static unsigned int max_poll_reqs; /* reslock */
92		171
93	/* calculcate time difference in ~1/EIO_TICKS of a second */	172	static volatile unsigned int nreqs; /* reqlock */
94	static int tvdiff (struct timeval *tv1, struct timeval *tv2)	173	static volatile unsigned int nready; /* reqlock */
95	{	174	static volatile unsigned int npending; /* reqlock */
96	return (tv2->tv_sec - tv1->tv_sec ) * EIO_TICKS	175	static volatile unsigned int max_idle = 4;
97	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
98	}
99		176
100	static unsigned int started, idle, wanted;
101
102	/* worker threads management */
103	static mutex_t wrklock = X_MUTEX_INIT;	177	static mutex_t wrklock = X_MUTEX_INIT;
104
105	typedef struct worker {
106	/* locked by wrklock */
107	struct worker *prev, *next;
108
109	thread_t tid;
110
111	/* locked by reslock, reqlock or wrklock */
112	eio_req *req; /* currently processed request */
113	void *dbuf;
114	DIR *dirp;
115	} worker;
116
117	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
118
119	static void worker_clear (worker *wrk)
120	{
121	if (wrk->dirp)
122	{
123	closedir (wrk->dirp);
124	wrk->dirp = 0;
125	}
126
127	if (wrk->dbuf)
128	{
129	free (wrk->dbuf);
130	wrk->dbuf = 0;
131	}
132	}
133
134	static void worker_free (worker *wrk)
135	{
136	wrk->next->prev = wrk->prev;
137	wrk->prev->next = wrk->next;
138
139	free (wrk);
140	}
141
142	static volatile unsigned int nreqs, nready, npending;
143	static volatile unsigned int max_idle = 4;
144
145	static mutex_t reslock = X_MUTEX_INIT;	178	static mutex_t reslock = X_MUTEX_INIT;
146	static mutex_t reqlock = X_MUTEX_INIT;	179	static mutex_t reqlock = X_MUTEX_INIT;
147	static cond_t reqwait = X_COND_INIT;	180	static cond_t reqwait = X_COND_INIT;
148		181
		182	#if !HAVE_PREADWRITE
		183	/*
		184	* make our pread/pwrite emulation safe against themselves, but not against
		185	* normal read/write by using a mutex. slows down execution a lot,
		186	* but that's your problem, not mine.
		187	*/
		188	static mutex_t preadwritelock = X_MUTEX_INIT;
		189	#endif
		190
		191	typedef struct etp_worker
		192	{
		193	/* locked by wrklock */
		194	struct etp_worker *prev, *next;
		195
		196	thread_t tid;
		197
		198	/* locked by reslock, reqlock or wrklock */
		199	ETP_REQ *req; /* currently processed request */
		200
		201	ETP_WORKER_COMMON
		202	} etp_worker;
		203
		204	static etp_worker wrk_first = { &wrk_first, &wrk_first, 0 }; /* NOT etp */
		205
		206	#define ETP_WORKER_LOCK(wrk) X_LOCK (wrklock)
		207	#define ETP_WORKER_UNLOCK(wrk) X_UNLOCK (wrklock)
		208
		209	/* worker threads management */
		210
		211	static void etp_worker_clear (etp_worker *wrk)
		212	{
		213	ETP_WORKER_CLEAR (wrk);
		214	}
		215
		216	static void etp_worker_free (etp_worker *wrk)
		217	{
		218	wrk->next->prev = wrk->prev;
		219	wrk->prev->next = wrk->next;
		220
		221	free (wrk);
		222	}
		223
149	unsigned int eio_nreqs (void)	224	static unsigned int etp_nreqs (void)
150	{	225	{
		226	int retval;
		227	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
		228	retval = nreqs;
		229	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
151	return nreqs;	230	return retval;
152	}	231	}
153		232
154	unsigned int eio_nready (void)	233	static unsigned int etp_nready (void)
155	{	234	{
156	unsigned int retval;	235	unsigned int retval;
157		236
158	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);	237	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
159	retval = nready;	238	retval = nready;
160	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);	239	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
161		240
162	return retval;	241	return retval;
163	}	242	}
164		243
165	unsigned int eio_npending (void)	244	static unsigned int etp_npending (void)
166	{	245	{
167	unsigned int retval;	246	unsigned int retval;
168		247
169	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);	248	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
170	retval = npending;	249	retval = npending;
171	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);	250	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
172		251
173	return retval;	252	return retval;
174	}	253	}
175		254
176	unsigned int eio_nthreads (void)	255	static unsigned int etp_nthreads (void)
177	{	256	{
178	unsigned int retval;	257	unsigned int retval;
179		258
180	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);	259	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
181	retval = started;	260	retval = started;
…		…
188	* a somewhat faster data structure might be nice, but	267	* a somewhat faster data structure might be nice, but
189	* with 8 priorities this actually needs <20 insns	268	* with 8 priorities this actually needs <20 insns
190	* per shift, the most expensive operation.	269	* per shift, the most expensive operation.
191	*/	270	*/
192	typedef struct {	271	typedef struct {
193	eio_req *qs[EIO_NUM_PRI], *qe[EIO_NUM_PRI]; /* qstart, qend */	272	ETP_REQ *qs[ETP_NUM_PRI], *qe[ETP_NUM_PRI]; /* qstart, qend */
194	int size;	273	int size;
195	} reqq;	274	} etp_reqq;
196		275
197	static reqq req_queue;	276	static etp_reqq req_queue;
198	static reqq res_queue;	277	static etp_reqq res_queue;
199		278
200	static int reqq_push (reqq *q, eio_req *req)	279	static int reqq_push (etp_reqq *q, ETP_REQ *req)
201	{	280	{
202	int pri = req->pri;	281	int pri = req->pri;
203	req->next = 0;	282	req->next = 0;
204		283
205	if (q->qe[pri])	284	if (q->qe[pri])
…		…
211	q->qe[pri] = q->qs[pri] = req;	290	q->qe[pri] = q->qs[pri] = req;
212		291
213	return q->size++;	292	return q->size++;
214	}	293	}
215		294
216	static eio_req *reqq_shift (reqq *q)	295	static ETP_REQ *reqq_shift (etp_reqq *q)
217	{	296	{
218	int pri;	297	int pri;
219		298
220	if (!q->size)	299	if (!q->size)
221	return 0;	300	return 0;
222		301
223	--q->size;	302	--q->size;
224		303
225	for (pri = EIO_NUM_PRI; pri--; )	304	for (pri = ETP_NUM_PRI; pri--; )
226	{	305	{
227	eio_req *req = q->qs[pri];	306	eio_req *req = q->qs[pri];
228		307
229	if (req)	308	if (req)
230	{	309	{
…		…
236	}	315	}
237		316
238	abort ();	317	abort ();
239	}	318	}
240		319
241	static void grp_try_feed (eio_req *grp)	320	static void etp_atfork_prepare (void)
242	{	321	{
243	while (grp->size < grp->int2 && !EIO_CANCELLED (grp))	322	X_LOCK (wrklock);
		323	X_LOCK (reqlock);
		324	X_LOCK (reslock);
		325	#if !HAVE_PREADWRITE
		326	X_LOCK (preadwritelock);
		327	#endif
		328	}
		329
		330	static void etp_atfork_parent (void)
		331	{
		332	#if !HAVE_PREADWRITE
		333	X_UNLOCK (preadwritelock);
		334	#endif
		335	X_UNLOCK (reslock);
		336	X_UNLOCK (reqlock);
		337	X_UNLOCK (wrklock);
		338	}
		339
		340	static void etp_atfork_child (void)
		341	{
		342	ETP_REQ *prv;
		343
		344	while ((prv = reqq_shift (&req_queue)))
		345	ETP_DESTROY (prv);
		346
		347	while ((prv = reqq_shift (&res_queue)))
		348	ETP_DESTROY (prv);
		349
		350	while (wrk_first.next != &wrk_first)
244	{	351	{
245	int old_len = grp->size;	352	etp_worker *wrk = wrk_first.next;
246		353
247	EIO_FEED (grp);	354	if (wrk->req)
		355	ETP_DESTROY (wrk->req);
248		356
249	/* stop if no progress has been made */	357	etp_worker_clear (wrk);
250	if (old_len == grp->size)	358	etp_worker_free (wrk);
251	{
252	grp->feed = 0;
253	break;
254	}
255	}	359	}
256	}
257		360
258	static int eio_finish (eio_req *req);	361	started = 0;
		362	idle = 0;
		363	nreqs = 0;
		364	nready = 0;
		365	npending = 0;
259		366
260	static int grp_dec (eio_req *grp)	367	etp_atfork_parent ();
261	{	368	}
262	--grp->size;
263		369
264	/* call feeder, if applicable */	370	static void
265	grp_try_feed (grp);	371	etp_once_init (void)
		372	{
		373	X_THREAD_ATFORK (etp_atfork_prepare, etp_atfork_parent, etp_atfork_child);
		374	}
266		375
267	/* finish, if done */	376	static int
268	if (!grp->size && grp->int1)	377	etp_init (void (*want_poll)(void), void (*done_poll)(void))
269	return eio_finish (grp);	378	{
270	else	379	static pthread_once_t doinit = PTHREAD_ONCE_INIT;
		380
		381	pthread_once (&doinit, etp_once_init);
		382
		383	want_poll_cb = want_poll;
		384	done_poll_cb = done_poll;
		385
271	return 0;	386	return 0;
272	}	387	}
273		388
274	void eio_destroy (eio_req *req)
275	{
276	if ((req)->flags & EIO_FLAG_PTR1_FREE) free (req->ptr1);
277	if ((req)->flags & EIO_FLAG_PTR2_FREE) free (req->ptr2);
278
279	EIO_DESTROY (req);
280	}
281
282	static int eio_finish (eio_req *req)
283	{
284	int res = EIO_FINISH (req);
285
286	if (req->grp)
287	{
288	int res2;
289	eio_req *grp = req->grp;
290
291	/* unlink request */
292	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
293	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
294
295	if (grp->grp_first == req)
296	grp->grp_first = req->grp_next;
297
298	res2 = grp_dec (grp);
299
300	if (!res && res2)
301	res = res2;
302	}
303
304	eio_destroy (req);
305
306	return res;
307	}
308
309	void eio_grp_cancel (eio_req *grp)
310	{
311	for (grp = grp->grp_first; grp; grp = grp->grp_next)
312	eio_cancel (grp);
313	}
314
315	void eio_cancel (eio_req *req)
316	{
317	X_LOCK (wrklock);
318	req->flags |= EIO_FLAG_CANCELLED;
319	X_UNLOCK (wrklock);
320
321	eio_grp_cancel (req);
322	}
323
324	X_THREAD_PROC (eio_proc);	389	X_THREAD_PROC (etp_proc);
325		390
326	static void start_thread (void)	391	static void etp_start_thread (void)
327	{	392	{
328	worker *wrk = calloc (1, sizeof (worker));	393	etp_worker *wrk = calloc (1, sizeof (etp_worker));
329		394
330	if (!wrk)	395	/*TODO*/
331	croak ("unable to allocate worker thread data");	396	assert (("unable to allocate worker thread data", wrk));
332		397
333	X_LOCK (wrklock);	398	X_LOCK (wrklock);
334		399
335	if (thread_create (&wrk->tid, eio_proc, (void *)wrk))	400	if (thread_create (&wrk->tid, etp_proc, (void *)wrk))
336	{	401	{
337	wrk->prev = &wrk_first;	402	wrk->prev = &wrk_first;
338	wrk->next = wrk_first.next;	403	wrk->next = wrk_first.next;
339	wrk_first.next->prev = wrk;	404	wrk_first.next->prev = wrk;
340	wrk_first.next = wrk;	405	wrk_first.next = wrk;
…		…
344	free (wrk);	409	free (wrk);
345		410
346	X_UNLOCK (wrklock);	411	X_UNLOCK (wrklock);
347	}	412	}
348		413
349	static void maybe_start_thread (void)	414	static void etp_maybe_start_thread (void)
350	{	415	{
351	if (eio_nthreads () >= wanted)	416	if (etp_nthreads () >= wanted)
352	return;	417	return;
353		418
354	/* todo: maybe use idle here, but might be less exact */	419	/* todo: maybe use idle here, but might be less exact */
355	if (0 <= (int)eio_nthreads () + (int)eio_npending () - (int)eio_nreqs ())	420	if (0 <= (int)etp_nthreads () + (int)etp_npending () - (int)etp_nreqs ())
356	return;	421	return;
357		422
358	start_thread ();	423	etp_start_thread ();
359	}	424	}
360		425
361	void eio_submit (eio_req *req)
362	{
363	++nreqs;
364
365	X_LOCK (reqlock);
366	++nready;
367	reqq_push (&req_queue, req);
368	X_COND_SIGNAL (reqwait);
369	X_UNLOCK (reqlock);
370
371	maybe_start_thread ();
372	}
373
374	static void end_thread (void)	426	static void etp_end_thread (void)
375	{	427	{
376	eio_req *req = calloc (1, sizeof (eio_req));	428	eio_req *req = calloc (1, sizeof (eio_req));
377		429
378	req->type = EIO_QUIT;	430	req->type = -1;
379	req->pri = EIO_PRI_MAX + EIO_PRI_BIAS;	431	req->pri = ETP_PRI_MAX - ETP_PRI_MIN;
380		432
381	X_LOCK (reqlock);	433	X_LOCK (reqlock);
382	reqq_push (&req_queue, req);	434	reqq_push (&req_queue, req);
383	X_COND_SIGNAL (reqwait);	435	X_COND_SIGNAL (reqwait);
384	X_UNLOCK (reqlock);	436	X_UNLOCK (reqlock);
…		…
386	X_LOCK (wrklock);	438	X_LOCK (wrklock);
387	--started;	439	--started;
388	X_UNLOCK (wrklock);	440	X_UNLOCK (wrklock);
389	}	441	}
390		442
391	void eio_set_max_poll_time (double nseconds)
392	{
393	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
394	max_poll_time = nseconds;
395	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
396	}
397
398	void eio_set_max_poll_reqs (unsigned int maxreqs)
399	{
400	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
401	max_poll_reqs = maxreqs;
402	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
403	}
404
405	void eio_set_max_idle (unsigned int nthreads)
406	{
407	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
408	max_idle = nthreads <= 0 ? 1 : nthreads;
409	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
410	}
411
412	void eio_set_min_parallel (unsigned int nthreads)
413	{
414	if (wanted < nthreads)
415	wanted = nthreads;
416	}
417
418	void eio_set_max_parallel (unsigned int nthreads)
419	{
420	if (wanted > nthreads)
421	wanted = nthreads;
422
423	while (started > wanted)
424	end_thread ();
425	}
426
427	int eio_poll (void)	443	static int etp_poll (void)
428	{	444	{
429	int maxreqs = max_poll_reqs;	445	unsigned int maxreqs;
		446	unsigned int maxtime;
430	struct timeval tv_start, tv_now;	447	struct timeval tv_start, tv_now;
431	eio_req *req;
432		448
		449	X_LOCK (reslock);
		450	maxreqs = max_poll_reqs;
		451	maxtime = max_poll_time;
		452	X_UNLOCK (reslock);
		453
433	if (max_poll_time)	454	if (maxtime)
434	gettimeofday (&tv_start, 0);	455	gettimeofday (&tv_start, 0);
435		456
436	for (;;)	457	for (;;)
437	{	458	{
		459	ETP_REQ *req;
		460
438	maybe_start_thread ();	461	etp_maybe_start_thread ();
439		462
440	X_LOCK (reslock);	463	X_LOCK (reslock);
441	req = reqq_shift (&res_queue);	464	req = reqq_shift (&res_queue);
442		465
443	if (req)	466	if (req)
…		…
451	X_UNLOCK (reslock);	474	X_UNLOCK (reslock);
452		475
453	if (!req)	476	if (!req)
454	return 0;	477	return 0;
455		478
		479	X_LOCK (reqlock);
456	--nreqs;	480	--nreqs;
		481	X_UNLOCK (reqlock);
457		482
458	if (req->type == EIO_GROUP && req->size)	483	if (req->type == EIO_GROUP && req->size)
459	{	484	{
460	req->int1 = 1; /* mark request as delayed */	485	req->int1 = 1; /* mark request as delayed */
461	continue;	486	continue;
462	}	487	}
463	else	488	else
464	{	489	{
465	int res = eio_finish (req);	490	int res = ETP_FINISH (req);
466	if (res)	491	if (res)
467	return res;	492	return res;
468	}	493	}
469		494
470	if (maxreqs && !--maxreqs)	495	if (maxreqs && !--maxreqs)
471	break;	496	break;
472		497
473	if (max_poll_time)	498	if (maxtime)
474	{	499	{
475	gettimeofday (&tv_now, 0);	500	gettimeofday (&tv_now, 0);
476		501
477	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)	502	if (tvdiff (&tv_start, &tv_now) >= maxtime)
478	break;	503	break;
479	}	504	}
480	}	505	}
481		506
482	errno = EAGAIN;	507	errno = EAGAIN;
483	return -1;	508	return -1;
484	}	509	}
485		510
		511	static void etp_cancel (ETP_REQ *req)
		512	{
		513	X_LOCK (wrklock);
		514	req->flags |= EIO_FLAG_CANCELLED;
		515	X_UNLOCK (wrklock);
		516
		517	eio_grp_cancel (req);
		518	}
		519
		520	static void etp_submit (ETP_REQ *req)
		521	{
		522	req->pri -= ETP_PRI_MIN;
		523
		524	if (req->pri < ETP_PRI_MIN - ETP_PRI_MIN) req->pri = ETP_PRI_MIN - ETP_PRI_MIN;
		525	if (req->pri > ETP_PRI_MAX - ETP_PRI_MIN) req->pri = ETP_PRI_MAX - ETP_PRI_MIN;
		526
		527	X_LOCK (reqlock);
		528	++nreqs;
		529	++nready;
		530	reqq_push (&req_queue, req);
		531	X_COND_SIGNAL (reqwait);
		532	X_UNLOCK (reqlock);
		533
		534	etp_maybe_start_thread ();
		535	}
		536
		537	static void etp_set_max_poll_time (double nseconds)
		538	{
		539	if (WORDACCESS_UNSAFE) X_LOCK (reslock);
		540	max_poll_time = nseconds;
		541	if (WORDACCESS_UNSAFE) X_UNLOCK (reslock);
		542	}
		543
		544	static void etp_set_max_poll_reqs (unsigned int maxreqs)
		545	{
		546	if (WORDACCESS_UNSAFE) X_LOCK (reslock);
		547	max_poll_reqs = maxreqs;
		548	if (WORDACCESS_UNSAFE) X_UNLOCK (reslock);
		549	}
		550
		551	static void etp_set_max_idle (unsigned int nthreads)
		552	{
		553	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
		554	max_idle = nthreads <= 0 ? 1 : nthreads;
		555	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
		556	}
		557
		558	static void etp_set_min_parallel (unsigned int nthreads)
		559	{
		560	if (wanted < nthreads)
		561	wanted = nthreads;
		562	}
		563
		564	static void etp_set_max_parallel (unsigned int nthreads)
		565	{
		566	if (wanted > nthreads)
		567	wanted = nthreads;
		568
		569	while (started > wanted)
		570	etp_end_thread ();
		571	}
		572
		573	/*****************************************************************************/
		574
		575	static void grp_try_feed (eio_req *grp)
		576	{
		577	while (grp->size < grp->int2 && !EIO_CANCELLED (grp))
		578	{
		579	int old_len = grp->size;
		580
		581	EIO_FEED (grp);
		582
		583	/* stop if no progress has been made */
		584	if (old_len == grp->size)
		585	{
		586	grp->feed = 0;
		587	break;
		588	}
		589	}
		590	}
		591
		592	static int grp_dec (eio_req *grp)
		593	{
		594	--grp->size;
		595
		596	/* call feeder, if applicable */
		597	grp_try_feed (grp);
		598
		599	/* finish, if done */
		600	if (!grp->size && grp->int1)
		601	return eio_finish (grp);
		602	else
		603	return 0;
		604	}
		605
		606	void eio_destroy (eio_req *req)
		607	{
		608	if ((req)->flags & EIO_FLAG_PTR1_FREE) free (req->ptr1);
		609	if ((req)->flags & EIO_FLAG_PTR2_FREE) free (req->ptr2);
		610
		611	EIO_DESTROY (req);
		612	}
		613
		614	static int eio_finish (eio_req *req)
		615	{
		616	int res = EIO_FINISH (req);
		617
		618	if (req->grp)
		619	{
		620	int res2;
		621	eio_req *grp = req->grp;
		622
		623	/* unlink request */
		624	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		625	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		626
		627	if (grp->grp_first == req)
		628	grp->grp_first = req->grp_next;
		629
		630	res2 = grp_dec (grp);
		631
		632	if (!res && res2)
		633	res = res2;
		634	}
		635
		636	eio_destroy (req);
		637
		638	return res;
		639	}
		640
		641	void eio_grp_cancel (eio_req *grp)
		642	{
		643	for (grp = grp->grp_first; grp; grp = grp->grp_next)
		644	eio_cancel (grp);
		645	}
		646
		647	void eio_cancel (eio_req *req)
		648	{
		649	etp_cancel (req);
		650	}
		651
		652	void eio_submit (eio_req *req)
		653	{
		654	etp_submit (req);
		655	}
		656
		657	unsigned int eio_nreqs (void)
		658	{
		659	return etp_nreqs ();
		660	}
		661
		662	unsigned int eio_nready (void)
		663	{
		664	return etp_nready ();
		665	}
		666
		667	unsigned int eio_npending (void)
		668	{
		669	return etp_npending ();
		670	}
		671
		672	unsigned int eio_nthreads (void)
		673	{
		674	return etp_nthreads ();
		675	}
		676
		677	void eio_set_max_poll_time (double nseconds)
		678	{
		679	etp_set_max_poll_time (nseconds);
		680	}
		681
		682	void eio_set_max_poll_reqs (unsigned int maxreqs)
		683	{
		684	etp_set_max_poll_reqs (maxreqs);
		685	}
		686
		687	void eio_set_max_idle (unsigned int nthreads)
		688	{
		689	etp_set_max_idle (nthreads);
		690	}
		691
		692	void eio_set_min_parallel (unsigned int nthreads)
		693	{
		694	etp_set_min_parallel (nthreads);
		695	}
		696
		697	void eio_set_max_parallel (unsigned int nthreads)
		698	{
		699	etp_set_max_parallel (nthreads);
		700	}
		701
		702	int eio_poll (void)
		703	{
		704	return etp_poll ();
		705	}
		706
486	/*****************************************************************************/	707	/*****************************************************************************/
487	/* work around various missing functions */	708	/* work around various missing functions */
488		709
489	#if !HAVE_PREADWRITE	710	#if !HAVE_PREADWRITE
490	# define pread aio_pread	711	# define pread eio__pread
491	# define pwrite aio_pwrite	712	# define pwrite eio__pwrite
492		713
493	/*	714	static ssize_t
494	* make our pread/pwrite safe against themselves, but not against	715	eio__pread (int fd, void *buf, size_t count, off_t offset)
495	* normal read/write by using a mutex. slows down execution a lot,
496	* but that's your problem, not mine.
497	*/
498	static mutex_t preadwritelock = X_MUTEX_INIT;
499
500	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
501	{	716	{
502	ssize_t res;	717	ssize_t res;
503	off_t ooffset;	718	off_t ooffset;
504		719
505	X_LOCK (preadwritelock);	720	X_LOCK (preadwritelock);
…		…
510	X_UNLOCK (preadwritelock);	725	X_UNLOCK (preadwritelock);
511		726
512	return res;	727	return res;
513	}	728	}
514		729
515	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)	730	static ssize_t
		731	eio__pwrite (int fd, void *buf, size_t count, off_t offset)
516	{	732	{
517	ssize_t res;	733	ssize_t res;
518	off_t ooffset;	734	off_t ooffset;
519		735
520	X_LOCK (preadwritelock);	736	X_LOCK (preadwritelock);
…		…
528	}	744	}
529	#endif	745	#endif
530		746
531	#ifndef HAVE_FUTIMES	747	#ifndef HAVE_FUTIMES
532		748
533	# define utimes(path,times) aio_utimes (path, times)	749	# define utimes(path,times) eio__utimes (path, times)
534	# define futimes(fd,times) aio_futimes (fd, times)	750	# define futimes(fd,times) eio__futimes (fd, times)
535		751
		752	static int
536	static int aio_utimes (const char *filename, const struct timeval times[2])	753	eio__utimes (const char *filename, const struct timeval times[2])
537	{	754	{
538	if (times)	755	if (times)
539	{	756	{
540	struct utimbuf buf;	757	struct utimbuf buf;
541		758
…		…
546	}	763	}
547	else	764	else
548	return utime (filename, 0);	765	return utime (filename, 0);
549	}	766	}
550		767
551	static int aio_futimes (int fd, const struct timeval tv[2])	768	static int eio__futimes (int fd, const struct timeval tv[2])
552	{	769	{
553	errno = ENOSYS;	770	errno = ENOSYS;
554	return -1;	771	return -1;
555	}	772	}
556		773
…		…
559	#if !HAVE_FDATASYNC	776	#if !HAVE_FDATASYNC
560	# define fdatasync fsync	777	# define fdatasync fsync
561	#endif	778	#endif
562		779
563	#if !HAVE_READAHEAD	780	#if !HAVE_READAHEAD
564	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)	781	# define readahead(fd,offset,count) eio__readahead (fd, offset, count, self)
565		782
		783	static ssize_t
566	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)	784	eio__readahead (int fd, off_t offset, size_t count, etp_worker *self)
567	{	785	{
568	size_t todo = count;	786	size_t todo = count;
569	dBUF;	787	dBUF;
570		788
571	while (todo > 0)	789	while (todo > 0)
…		…
581	return count;	799	return count;
582	}	800	}
583		801
584	#endif	802	#endif
585		803
586	#if !HAVE_READDIR_R
587	# define readdir_r aio_readdir_r
588
589	static mutex_t readdirlock = X_MUTEX_INIT;
590
591	static int readdir_r (DIR *dirp, EIO_STRUCT_DIRENT *ent, EIO_STRUCT_DIRENT **res)
592	{
593	EIO_STRUCT_DIRENT *e;
594	int errorno;
595
596	X_LOCK (readdirlock);
597
598	e = readdir (dirp);
599	errorno = errno;
600
601	if (e)
602	{
603	*res = ent;
604	strcpy (ent->d_name, e->d_name);
605	}
606	else
607	*res = 0;
608
609	X_UNLOCK (readdirlock);
610
611	errno = errorno;
612	return e ? 0 : -1;
613	}
614	#endif
615
616	/* sendfile always needs emulation */	804	/* sendfile always needs emulation */
		805	static ssize_t
617	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)	806	eio__sendfile (int ofd, int ifd, off_t offset, size_t count, etp_worker *self)
618	{	807	{
619	ssize_t res;	808	ssize_t res;
620		809
621	if (!count)	810	if (!count)
622	return 0;	811	return 0;
…		…
705		894
706	return res;	895	return res;
707	}	896	}
708		897
709	/* read a full directory */	898	/* read a full directory */
		899	static void
710	static void scandir_ (eio_req *req, worker *self)	900	eio__scandir (eio_req *req, etp_worker *self)
711	{	901	{
712	DIR *dirp;	902	DIR *dirp;
713	union
714	{
715	EIO_STRUCT_DIRENT d;
716	char b [offsetof (EIO_STRUCT_DIRENT, d_name) + NAME_MAX + 1];
717	} *u;
718	EIO_STRUCT_DIRENT *entp;	903	EIO_STRUCT_DIRENT *entp;
719	char *name, *names;	904	char *name, *names;
720	int memlen = 4096;	905	int memlen = 4096;
721	int memofs = 0;	906	int memofs = 0;
722	int res = 0;	907	int res = 0;
723		908
724	X_LOCK (wrklock);	909	X_LOCK (wrklock);
		910	/* the corresponding closedir is in ETP_WORKER_CLEAR */
725	self->dirp = dirp = opendir (req->ptr1);	911	self->dirp = dirp = opendir (req->ptr1);
726	self->dbuf = u = malloc (sizeof (*u));
727	req->flags |= EIO_FLAG_PTR2_FREE;	912	req->flags |= EIO_FLAG_PTR2_FREE;
728	req->ptr2 = names = malloc (memlen);	913	req->ptr2 = names = malloc (memlen);
729	X_UNLOCK (wrklock);	914	X_UNLOCK (wrklock);
730		915
731	if (dirp && u && names)	916	if (dirp && names)
732	for (;;)	917	for (;;)
733	{	918	{
734	errno = 0;	919	errno = 0;
735	readdir_r (dirp, &u->d, &entp);	920	entp = readdir (dirp);
736		921
737	if (!entp)	922	if (!entp)
738	break;	923	break;
739		924
740	name = entp->d_name;	925	name = entp->d_name;
…		…
765	res = -1;	950	res = -1;
766		951
767	req->result = res;	952	req->result = res;
768	}	953	}
769		954
		955	#if !(_POSIX_MAPPED_FILES && _POSIX_SYNCHRONIZED_IO)
		956	# define msync(a,b,c) ENOSYS
		957	#endif
		958
		959	int
		960	eio__mtouch (void *mem, size_t len, int flags)
		961	{
		962	intptr_t addr = (intptr_t)mem;
		963	intptr_t end = addr + len;
		964	#ifdef PAGESIZE
		965	const intptr_t page = PAGESIZE;
		966	#else
		967	static intptr_t page;
		968
		969	if (!page)
		970	page = sysconf (_SC_PAGESIZE);
		971	#endif
		972
		973	addr &= ~(page - 1); /* assume page size is always a power of two */
		974
		975	if (addr < end)
		976	if (flags) /* modify */
		977	do { *((volatile sig_atomic_t *)addr) |= 0; } while ((addr += page) < len);
		978	else
		979	do { *((volatile sig_atomic_t *)addr) ; } while ((addr += page) < len);
		980
		981	return 0;
		982	}
		983
770	/*****************************************************************************/	984	/*****************************************************************************/
771		985
772	#define ALLOC(len) \	986	#define ALLOC(len) \
773	X_LOCK (wrklock); \
774	req->flags |= EIO_FLAG_PTR2_FREE; \
775	X_UNLOCK (wrklock); \
776	req->ptr2 = malloc (len); \
777	if (!req->ptr2) \	987	if (!req->ptr2) \
778	{ \	988	{ \
		989	X_LOCK (wrklock); \
		990	req->flags |= EIO_FLAG_PTR2_FREE; \
		991	X_UNLOCK (wrklock); \
		992	req->ptr2 = malloc (len); \
		993	if (!req->ptr2) \
		994	{ \
779	errno = ENOMEM; \	995	errno = ENOMEM; \
780	req->result = -1; \	996	req->result = -1; \
781	break; \	997	break; \
		998	} \
782	}	999	}
783		1000
784	X_THREAD_PROC (eio_proc)	1001	X_THREAD_PROC (etp_proc)
785	{	1002	{
786	eio_req *req;	1003	ETP_REQ *req;
787	struct timespec ts;	1004	struct timespec ts;
788	worker *self = (worker *)thr_arg;	1005	etp_worker *self = (etp_worker *)thr_arg;
789		1006
790	/* try to distribute timeouts somewhat randomly */	1007	/* try to distribute timeouts somewhat randomly */
791	ts.tv_nsec = ((unsigned long)self & 1023UL) * (1000000000UL / 1024UL);	1008	ts.tv_nsec = ((unsigned long)self & 1023UL) * (1000000000UL / 1024UL);
792		1009
793	for (;;)	1010	for (;;)
794	{	1011	{
795	ts.tv_sec = time (0) + IDLE_TIMEOUT;
796
797	X_LOCK (reqlock);	1012	X_LOCK (reqlock);
798		1013
799	for (;;)	1014	for (;;)
800	{	1015	{
801	self->req = req = reqq_shift (&req_queue);	1016	self->req = req = reqq_shift (&req_queue);
…		…
803	if (req)	1018	if (req)
804	break;	1019	break;
805		1020
806	++idle;	1021	++idle;
807		1022
		1023	ts.tv_sec = time (0) + IDLE_TIMEOUT;
808	if (X_COND_TIMEDWAIT (reqwait, reqlock, ts) == ETIMEDOUT)	1024	if (X_COND_TIMEDWAIT (reqwait, reqlock, ts) == ETIMEDOUT)
809	{	1025	{
810	if (idle > max_idle)	1026	if (idle > max_idle)
811	{	1027	{
812	--idle;	1028	--idle;
…		…
817	goto quit;	1033	goto quit;
818	}	1034	}
819		1035
820	/* we are allowed to idle, so do so without any timeout */	1036	/* we are allowed to idle, so do so without any timeout */
821	X_COND_WAIT (reqwait, reqlock);	1037	X_COND_WAIT (reqwait, reqlock);
822	ts.tv_sec = time (0) + IDLE_TIMEOUT;
823	}	1038	}
824		1039
825	--idle;	1040	--idle;
826	}	1041	}
827		1042
828	--nready;	1043	--nready;
829		1044
830	X_UNLOCK (reqlock);	1045	X_UNLOCK (reqlock);
831		1046
832	errno = 0; /* strictly unnecessary */	1047	if (req->type < 0)
		1048	goto quit;
833		1049
834	if (!EIO_CANCELLED (req))	1050	if (!EIO_CANCELLED (req))
835	switch (req->type)	1051	ETP_EXECUTE (self, req);
836	{
837	case EIO_READ: req->result = req->offs >= 0
838	? pread (req->int1, req->ptr2, req->size, req->offs)
839	: read (req->int1, req->ptr2, req->size); break;
840	case EIO_WRITE: req->result = req->offs >= 0
841	? pwrite (req->int1, req->ptr2, req->size, req->offs)
842	: write (req->int1, req->ptr2, req->size); break;
843
844	case EIO_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
845	case EIO_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
846
847	case EIO_STAT: ALLOC (sizeof (EIO_STRUCT_STAT));
848	req->result = stat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
849	case EIO_LSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
850	req->result = lstat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
851	case EIO_FSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
852	req->result = fstat (req->int1, (EIO_STRUCT_STAT *)req->ptr2); break;
853
854	case EIO_CHOWN: req->result = chown (req->ptr1, req->int2, req->int3); break;
855	case EIO_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break;
856	case EIO_CHMOD: req->result = chmod (req->ptr1, (mode_t)req->int2); break;
857	case EIO_FCHMOD: req->result = fchmod (req->int1, (mode_t)req->int2); break;
858	case EIO_TRUNCATE: req->result = truncate (req->ptr1, req->offs); break;
859	case EIO_FTRUNCATE: req->result = ftruncate (req->int1, req->offs); break;
860
861	case EIO_OPEN: req->result = open (req->ptr1, req->int1, (mode_t)req->int2); break;
862	case EIO_CLOSE: req->result = close (req->int1); break;
863	case EIO_DUP2: req->result = dup2 (req->int1, req->int2); break;
864	case EIO_UNLINK: req->result = unlink (req->ptr1); break;
865	case EIO_RMDIR: req->result = rmdir (req->ptr1); break;
866	case EIO_MKDIR: req->result = mkdir (req->ptr1, (mode_t)req->int2); break;
867	case EIO_RENAME: req->result = rename (req->ptr1, req->ptr2); break;
868	case EIO_LINK: req->result = link (req->ptr1, req->ptr2); break;
869	case EIO_SYMLINK: req->result = symlink (req->ptr1, req->ptr2); break;
870	case EIO_MKNOD: req->result = mknod (req->ptr1, (mode_t)req->int2, (dev_t)req->offs); break;
871	case EIO_READLINK: ALLOC (NAME_MAX);
872	req->result = readlink (req->ptr1, req->ptr2, NAME_MAX); break;
873
874	case EIO_SYNC: req->result = 0; sync (); break;
875	case EIO_FSYNC: req->result = fsync (req->int1); break;
876	case EIO_FDATASYNC: req->result = fdatasync (req->int1); break;
877
878	case EIO_READDIR: scandir_ (req, self); break;
879
880	case EIO_BUSY:
881	#ifdef _WIN32
882	Sleep (req->nv1 * 1000.);
883	#else
884	{
885	struct timeval tv;
886
887	tv.tv_sec = req->nv1;
888	tv.tv_usec = (req->nv1 - tv.tv_sec) * 1000000.;
889
890	req->result = select (0, 0, 0, 0, &tv);
891	}
892	#endif
893	break;
894
895	case EIO_UTIME:
896	case EIO_FUTIME:
897	{
898	struct timeval tv[2];
899	struct timeval *times;
900
901	if (req->nv1 != -1. || req->nv2 != -1.)
902	{
903	tv[0].tv_sec = req->nv1;
904	tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1000000.;
905	tv[1].tv_sec = req->nv2;
906	tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1000000.;
907
908	times = tv;
909	}
910	else
911	times = 0;
912
913
914	req->result = req->type == EIO_FUTIME
915	? futimes (req->int1, times)
916	: utimes (req->ptr1, times);
917	}
918
919	case EIO_GROUP:
920	case EIO_NOP:
921	break;
922
923	case EIO_QUIT:
924	goto quit;
925
926	default:
927	req->result = -1;
928	break;
929	}
930
931	req->errorno = errno;
932		1052
933	X_LOCK (reslock);	1053	X_LOCK (reslock);
934		1054
935	++npending;	1055	++npending;
936		1056
937	if (!reqq_push (&res_queue, req) && want_poll_cb)	1057	if (!reqq_push (&res_queue, req) && want_poll_cb)
938	want_poll_cb ();	1058	want_poll_cb ();
939		1059
940	self->req = 0;	1060	self->req = 0;
941	worker_clear (self);	1061	etp_worker_clear (self);
942		1062
943	X_UNLOCK (reslock);	1063	X_UNLOCK (reslock);
944	}	1064	}
945		1065
946	quit:	1066	quit:
947	X_LOCK (wrklock);	1067	X_LOCK (wrklock);
948	worker_free (self);	1068	etp_worker_free (self);
949	X_UNLOCK (wrklock);	1069	X_UNLOCK (wrklock);
950		1070
951	return 0;	1071	return 0;
952	}	1072	}
953		1073
954	/*****************************************************************************/	1074	/*****************************************************************************/
955		1075
956	static void eio_atfork_prepare (void)
957	{
958	X_LOCK (wrklock);
959	X_LOCK (reqlock);
960	X_LOCK (reslock);
961	#if !HAVE_PREADWRITE
962	X_LOCK (preadwritelock);
963	#endif
964	#if !HAVE_READDIR_R
965	X_LOCK (readdirlock);
966	#endif
967	}
968
969	static void eio_atfork_parent (void)
970	{
971	#if !HAVE_READDIR_R
972	X_UNLOCK (readdirlock);
973	#endif
974	#if !HAVE_PREADWRITE
975	X_UNLOCK (preadwritelock);
976	#endif
977	X_UNLOCK (reslock);
978	X_UNLOCK (reqlock);
979	X_UNLOCK (wrklock);
980	}
981
982	static void eio_atfork_child (void)
983	{
984	eio_req *prv;
985
986	while (prv = reqq_shift (&req_queue))
987	eio_destroy (prv);
988
989	while (prv = reqq_shift (&res_queue))
990	eio_destroy (prv);
991
992	while (wrk_first.next != &wrk_first)
993	{
994	worker *wrk = wrk_first.next;
995
996	if (wrk->req)
997	eio_destroy (wrk->req);
998
999	worker_clear (wrk);
1000	worker_free (wrk);
1001	}
1002
1003	started = 0;
1004	idle = 0;
1005	nreqs = 0;
1006	nready = 0;
1007	npending = 0;
1008
1009	eio_atfork_parent ();
1010	}
1011
1012	int eio_init (void (*want_poll)(void), void (*done_poll)(void))	1076	int eio_init (void (*want_poll)(void), void (*done_poll)(void))
1013	{	1077	{
1014	want_poll_cb = want_poll;	1078	return etp_init (want_poll, done_poll);
1015	done_poll_cb = done_poll;
1016
1017	#ifdef _WIN32
1018	X_MUTEX_CHECK (wrklock);
1019	X_MUTEX_CHECK (reslock);
1020	X_MUTEX_CHECK (reqlock);
1021	X_MUTEX_CHECK (reqwait);
1022	X_MUTEX_CHECK (preadwritelock);
1023	X_MUTEX_CHECK (readdirlock);
1024
1025	X_COND_CHECK (reqwait);
1026	#endif
1027
1028	X_THREAD_ATFORK (eio_atfork_prepare, eio_atfork_parent, eio_atfork_child);
1029	}	1079	}
1030		1080
1031	static void eio_api_destroy (eio_req *req)	1081	static void eio_api_destroy (eio_req *req)
1032	{	1082	{
1033	free (req);	1083	free (req);
…		…
1038	\	1088	\
1039	req = (eio_req *)calloc (1, sizeof *req); \	1089	req = (eio_req *)calloc (1, sizeof *req); \
1040	if (!req) \	1090	if (!req) \
1041	return 0; \	1091	return 0; \
1042	\	1092	\
1043	req->type = EIO_ ## rtype; \	1093	req->type = rtype; \
1044	req->pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS; \	1094	req->pri = pri; \
1045	req->finish = cb; \	1095	req->finish = cb; \
		1096	req->data = data; \
1046	req->destroy = eio_api_destroy;	1097	req->destroy = eio_api_destroy;
1047		1098
1048	#define SEND eio_submit (req); return req	1099	#define SEND eio_submit (req); return req
1049		1100
1050	#define PATH (void)0	1101	#define PATH \
		1102	req->flags |= EIO_FLAG_PTR1_FREE; \
		1103	req->ptr1 = strdup (path); \
		1104	if (!req->ptr1) \
		1105	{ \
		1106	eio_api_destroy (req); \
		1107	return 0; \
		1108	}
1051		1109
		1110	static void eio_execute (etp_worker *self, eio_req *req)
		1111	{
		1112	errno = 0;
		1113
		1114	switch (req->type)
		1115	{
		1116	case EIO_READ: ALLOC (req->size);
		1117	req->result = req->offs >= 0
		1118	? pread (req->int1, req->ptr2, req->size, req->offs)
		1119	: read (req->int1, req->ptr2, req->size); break;
		1120	case EIO_WRITE: req->result = req->offs >= 0
		1121	? pwrite (req->int1, req->ptr2, req->size, req->offs)
		1122	: write (req->int1, req->ptr2, req->size); break;
		1123
		1124	case EIO_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1125	case EIO_SENDFILE: req->result = eio__sendfile (req->int1, req->int2, req->offs, req->size, self); break;
		1126
		1127	case EIO_STAT: ALLOC (sizeof (EIO_STRUCT_STAT));
		1128	req->result = stat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
		1129	case EIO_LSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
		1130	req->result = lstat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
		1131	case EIO_FSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
		1132	req->result = fstat (req->int1, (EIO_STRUCT_STAT *)req->ptr2); break;
		1133
		1134	case EIO_CHOWN: req->result = chown (req->ptr1, req->int2, req->int3); break;
		1135	case EIO_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break;
		1136	case EIO_CHMOD: req->result = chmod (req->ptr1, (mode_t)req->int2); break;
		1137	case EIO_FCHMOD: req->result = fchmod (req->int1, (mode_t)req->int2); break;
		1138	case EIO_TRUNCATE: req->result = truncate (req->ptr1, req->offs); break;
		1139	case EIO_FTRUNCATE: req->result = ftruncate (req->int1, req->offs); break;
		1140
		1141	case EIO_OPEN: req->result = open (req->ptr1, req->int1, (mode_t)req->int2); break;
		1142	case EIO_CLOSE: req->result = close (req->int1); break;
		1143	case EIO_DUP2: req->result = dup2 (req->int1, req->int2); break;
		1144	case EIO_UNLINK: req->result = unlink (req->ptr1); break;
		1145	case EIO_RMDIR: req->result = rmdir (req->ptr1); break;
		1146	case EIO_MKDIR: req->result = mkdir (req->ptr1, (mode_t)req->int2); break;
		1147	case EIO_RENAME: req->result = rename (req->ptr1, req->ptr2); break;
		1148	case EIO_LINK: req->result = link (req->ptr1, req->ptr2); break;
		1149	case EIO_SYMLINK: req->result = symlink (req->ptr1, req->ptr2); break;
		1150	case EIO_MKNOD: req->result = mknod (req->ptr1, (mode_t)req->int2, (dev_t)req->int3); break;
		1151
		1152	case EIO_READLINK: ALLOC (NAME_MAX);
		1153	req->result = readlink (req->ptr1, req->ptr2, NAME_MAX); break;
		1154
		1155	case EIO_SYNC: req->result = 0; sync (); break;
		1156	case EIO_FSYNC: req->result = fsync (req->int1); break;
		1157	case EIO_FDATASYNC: req->result = fdatasync (req->int1); break;
		1158	case EIO_MSYNC: req->result = msync (req->ptr2, req->size, req->int1); break;
		1159	case EIO_MTOUCH: req->result = eio__mtouch (req->ptr2, req->size, req->int1); break;
		1160
		1161	case EIO_READDIR: eio__scandir (req, self); break;
		1162
		1163	case EIO_BUSY:
		1164	#ifdef _WIN32
		1165	Sleep (req->nv1 * 1000.);
		1166	#else
		1167	{
		1168	struct timeval tv;
		1169
		1170	tv.tv_sec = req->nv1;
		1171	tv.tv_usec = (req->nv1 - tv.tv_sec) * 1000000.;
		1172
		1173	req->result = select (0, 0, 0, 0, &tv);
		1174	}
		1175	#endif
		1176	break;
		1177
		1178	case EIO_UTIME:
		1179	case EIO_FUTIME:
		1180	{
		1181	struct timeval tv[2];
		1182	struct timeval *times;
		1183
		1184	if (req->nv1 != -1. || req->nv2 != -1.)
		1185	{
		1186	tv[0].tv_sec = req->nv1;
		1187	tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1000000.;
		1188	tv[1].tv_sec = req->nv2;
		1189	tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1000000.;
		1190
		1191	times = tv;
		1192	}
		1193	else
		1194	times = 0;
		1195
		1196
		1197	req->result = req->type == EIO_FUTIME
		1198	? futimes (req->int1, times)
		1199	: utimes (req->ptr1, times);
		1200	}
		1201
		1202	case EIO_GROUP:
		1203	case EIO_NOP:
		1204	req->result = 0;
		1205	break;
		1206
		1207	case EIO_CUSTOM:
		1208	((void (*)(eio_req *))req->feed) (req);
		1209	break;
		1210
		1211	default:
		1212	req->result = -1;
		1213	break;
		1214	}
		1215
		1216	req->errorno = errno;
		1217	}
		1218
		1219	#ifndef EIO_NO_WRAPPERS
		1220
		1221	eio_req *eio_nop (int pri, eio_cb cb, void *data)
		1222	{
		1223	REQ (EIO_NOP); SEND;
		1224	}
		1225
		1226	eio_req *eio_busy (double delay, int pri, eio_cb cb, void *data)
		1227	{
		1228	REQ (EIO_BUSY); req->nv1 = delay; SEND;
		1229	}
		1230
1052	eio_req *eio_fsync (int fd, eio_cb cb)	1231	eio_req *eio_sync (int pri, eio_cb cb, void *data)
1053	{	1232	{
		1233	REQ (EIO_SYNC); SEND;
		1234	}
		1235
		1236	eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data)
		1237	{
1054	REQ (FSYNC); req->int1 = fd; SEND;	1238	REQ (EIO_FSYNC); req->int1 = fd; SEND;
1055	}	1239	}
1056		1240
		1241	eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data)
		1242	{
		1243	REQ (EIO_MSYNC); req->ptr2 = addr; req->size = length; req->int1 = flags; SEND;
		1244	}
		1245
		1246	eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data)
		1247	{
		1248	REQ (EIO_MTOUCH); req->ptr2 = addr; req->size = length; req->int1 = flags; SEND;
		1249	}
		1250
1057	eio_req *eio_fdatasync (int fd, eio_cb cb)	1251	eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data)
1058	{	1252	{
1059	REQ (FDATASYNC); req->int1 = fd; SEND;	1253	REQ (EIO_FDATASYNC); req->int1 = fd; SEND;
1060	}	1254	}
1061		1255
		1256	eio_req *eio_close (int fd, int pri, eio_cb cb, void *data)
		1257	{
		1258	REQ (EIO_CLOSE); req->int1 = fd; SEND;
		1259	}
		1260
1062	eio_req *eio_readahead (int fd, off_t offset, size_t length, eio_cb cb)	1261	eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data)
1063	{	1262	{
1064	REQ (READAHEAD); req->int1 = fd; req->offs = offset; req->size = length; SEND;	1263	REQ (EIO_READAHEAD); req->int1 = fd; req->offs = offset; req->size = length; SEND;
1065	}	1264	}
1066		1265
1067	eio_req *eio_read (int fd, off_t offset, size_t length, void *data, eio_cb cb)	1266	eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data)
1068	{	1267	{
1069	REQ (READ); req->int1 = fd; req->offs = offset; req->size = length; req->ptr2 = data; SEND;	1268	REQ (EIO_READ); req->int1 = fd; req->offs = offset; req->size = length; req->ptr2 = buf; SEND;
1070	}	1269	}
1071		1270
1072	eio_req *eio_write (int fd, off_t offset, size_t length, void *data, eio_cb cb)	1271	eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data)
1073	{	1272	{
1074	REQ (WRITE); req->int1 = fd; req->offs = offset; req->size = length; req->ptr2 = data; SEND;	1273	REQ (EIO_WRITE); req->int1 = fd; req->offs = offset; req->size = length; req->ptr2 = buf; SEND;
1075	}	1274	}
1076		1275
1077	eio_req *eio_fstat (int fd, eio_cb cb)	1276	eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data)
1078	{	1277	{
1079	REQ (FSTAT); req->int1 = fd; SEND;	1278	REQ (EIO_FSTAT); req->int1 = fd; SEND;
1080	}	1279	}
1081		1280
1082	eio_req *eio_futime (int fd, double atime, double mtime, eio_cb cb)	1281	eio_req *eio_futime (int fd, double atime, double mtime, int pri, eio_cb cb, void *data)
1083	{	1282	{
1084	REQ (FUTIME); req->int1 = fd; req->nv1 = atime; req->nv2 = mtime; SEND;	1283	REQ (EIO_FUTIME); req->int1 = fd; req->nv1 = atime; req->nv2 = mtime; SEND;
1085	}	1284	}
1086		1285
1087	eio_req *eio_ftruncate (int fd, off_t offset, eio_cb cb)	1286	eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data)
1088	{	1287	{
1089	REQ (FTRUNCATE); req->int1 = fd; req->offs = offset; SEND;	1288	REQ (EIO_FTRUNCATE); req->int1 = fd; req->offs = offset; SEND;
1090	}	1289	}
1091		1290
1092	eio_req *eio_fchmod (int fd, mode_t mode, eio_cb cb)	1291	eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data)
1093	{	1292	{
1094	REQ (FCHMOD); req->int1 = fd; req->int2 = (long)mode; SEND;	1293	REQ (EIO_FCHMOD); req->int1 = fd; req->int2 = (long)mode; SEND;
1095	}	1294	}
1096		1295
1097	eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, eio_cb cb)	1296	eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data)
1098	{	1297	{
1099	REQ (FCHOWN); req->int1 = fd; req->int2 = (long)uid; req->int3 = (long)gid; SEND;	1298	REQ (EIO_FCHOWN); req->int1 = fd; req->int2 = (long)uid; req->int3 = (long)gid; SEND;
1100	}	1299	}
1101		1300
1102	eio_req *eio_dup2 (int fd, int fd2, eio_cb cb)	1301	eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data)
1103	{	1302	{
1104	REQ (DUP2); req->int1 = fd; req->int2 = fd2; SEND;	1303	REQ (EIO_DUP2); req->int1 = fd; req->int2 = fd2; SEND;
1105	}	1304	}
1106		1305
1107	eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, eio_cb cb)	1306	eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data)
1108	{	1307	{
1109	REQ (SENDFILE); req->int1 = out_fd; req->int2 = in_fd; req->offs = in_offset; req->size = length; SEND;	1308	REQ (EIO_SENDFILE); req->int1 = out_fd; req->int2 = in_fd; req->offs = in_offset; req->size = length; SEND;
1110	}	1309	}
1111		1310
1112	eio_req *eio_open (const char *path, int flags, mode_t mode, eio_cb cb)	1311	eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data)
1113	{	1312	{
1114	REQ (OPEN); PATH; req->int1 = flags; req->int2 = (long)mode; SEND;	1313	REQ (EIO_OPEN); PATH; req->int1 = flags; req->int2 = (long)mode; SEND;
1115	}	1314	}
1116		1315
1117	eio_req *eio_readlink (const char *path, eio_cb cb)
1118	{
1119	REQ (READLINK); PATH; SEND;
1120	}
1121
1122	eio_req *eio_stat (const char *path, eio_cb cb)
1123	{
1124	REQ (STAT); PATH; SEND;
1125	}
1126
1127	eio_req *eio_lstat (const char *path, eio_cb cb)
1128	{
1129	REQ (LSTAT); PATH; SEND;
1130	}
1131
1132	eio_req *eio_utime (const char *path, double atime, double mtime, eio_cb cb)	1316	eio_req *eio_utime (const char *path, double atime, double mtime, int pri, eio_cb cb, void *data)
1133	{	1317	{
1134	REQ (UTIME); PATH; req->nv1 = atime; req->nv2 = mtime; SEND;	1318	REQ (EIO_UTIME); PATH; req->nv1 = atime; req->nv2 = mtime; SEND;
1135	}	1319	}
1136		1320
1137	eio_req *eio_truncate (const char *path, off_t offset, eio_cb cb)	1321	eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data)
1138	{	1322	{
1139	REQ (TRUNCATE); PATH; req->offs = offset; SEND;	1323	REQ (EIO_TRUNCATE); PATH; req->offs = offset; SEND;
1140	}	1324	}
1141		1325
1142	eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, eio_cb cb)	1326	eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data)
1143	{	1327	{
1144	REQ (CHOWN); PATH; req->int2 = (long)uid; req->int3 = (long)gid; SEND;	1328	REQ (EIO_CHOWN); PATH; req->int2 = (long)uid; req->int3 = (long)gid; SEND;
1145	}	1329	}
1146		1330
1147	eio_req *eio_chmod (const char *path, mode_t mode, eio_cb cb)	1331	eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data)
1148	{	1332	{
1149	REQ (CHMOD); PATH; req->int2 = (long)mode; SEND;	1333	REQ (EIO_CHMOD); PATH; req->int2 = (long)mode; SEND;
1150	}	1334	}
1151		1335
1152	eio_req *eio_mkdir (const char *path, mode_t mode, eio_cb cb)	1336	eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data)
1153	{	1337	{
1154	REQ (MKDIR); PATH; req->int2 = (long)mode; SEND;	1338	REQ (EIO_MKDIR); PATH; req->int2 = (long)mode; SEND;
1155	}	1339	}
1156		1340
1157	eio_req *eio_unlink (const char *path, eio_cb cb)	1341	static eio_req *
		1342	eio__1path (int type, const char *path, int pri, eio_cb cb, void *data)
1158	{	1343	{
1159	REQ (UNLINK); PATH; SEND;
1160	}
1161
1162	eio_req *eio_rmdir (const char *path, eio_cb cb)
1163	{
1164	REQ (RMDIR); PATH; SEND;	1344	REQ (type); PATH; SEND;
1165	}	1345	}
1166		1346
		1347	eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data)
		1348	{
		1349	return eio__1path (EIO_READLINK, path, pri, cb, data);
		1350	}
		1351
		1352	eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data)
		1353	{
		1354	return eio__1path (EIO_STAT, path, pri, cb, data);
		1355	}
		1356
		1357	eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data)
		1358	{
		1359	return eio__1path (EIO_LSTAT, path, pri, cb, data);
		1360	}
		1361
		1362	eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data)
		1363	{
		1364	return eio__1path (EIO_UNLINK, path, pri, cb, data);
		1365	}
		1366
		1367	eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data)
		1368	{
		1369	return eio__1path (EIO_RMDIR, path, pri, cb, data);
		1370	}
		1371
1167	eio_req *eio_readdir (const char *path, eio_cb cb)	1372	eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data)
1168	{	1373	{
1169	REQ (READDIR); PATH; SEND;	1374	return eio__1path (EIO_READDIR, path, pri, cb, data);
1170	}	1375	}
1171		1376
1172	eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, eio_cb cb)	1377	eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data)
1173	{	1378	{
1174	REQ (MKNOD); PATH; req->int2 = (long)mode; req->int2 = (long)dev; SEND;	1379	REQ (EIO_MKNOD); PATH; req->int2 = (long)mode; req->int3 = (long)dev; SEND;
1175	}	1380	}
1176		1381
1177	eio_req *eio_busy (double delay, eio_cb cb)	1382	static eio_req *
		1383	eio__2path (int type, const char *path, const char *new_path, int pri, eio_cb cb, void *data)
1178	{	1384	{
1179	REQ (BUSY); req->nv1 = delay; SEND;	1385	REQ (type); PATH;
1180	}
1181		1386
		1387	req->flags |= EIO_FLAG_PTR2_FREE;
		1388	req->ptr2 = strdup (new_path);
		1389	if (!req->ptr2)
		1390	{
		1391	eio_api_destroy (req);
		1392	return 0;
		1393	}
		1394
		1395	SEND;
		1396	}
		1397
		1398	eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data)
		1399	{
		1400	return eio__2path (EIO_LINK, path, new_path, pri, cb, data);
		1401	}
		1402
		1403	eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data)
		1404	{
		1405	return eio__2path (EIO_SYMLINK, path, new_path, pri, cb, data);
		1406	}
		1407
		1408	eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data)
		1409	{
		1410	return eio__2path (EIO_RENAME, path, new_path, pri, cb, data);
		1411	}
		1412
		1413	eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data)
		1414	{
		1415	REQ (EIO_CUSTOM); req->feed = (void (*)(eio_req *))execute; SEND;
		1416	}
		1417
		1418	#endif
		1419
1182	eio_req *eio_nop (eio_cb cb)	1420	eio_req *eio_grp (eio_cb cb, void *data)
1183	{	1421	{
		1422	const int pri = EIO_PRI_MAX;
		1423
1184	REQ (NOP); SEND;	1424	REQ (EIO_GROUP); SEND;
1185	}	1425	}
1186		1426
1187	#undef REQ	1427	#undef REQ
1188	#undef PATH	1428	#undef PATH
1189	#undef SEND	1429	#undef SEND
1190		1430
1191	#if 0	1431	/*****************************************************************************/
1192		1432	/* grp functions */
1193	void
1194	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
1195	PROTOTYPE: $$$;$
1196	PPCODE:
1197	{
1198	dREQ;
1199
1200	req->type = EIO_OPEN;
1201	req->sv1 = newSVsv (pathname);
1202	req->ptr1 = SvPVbyte_nolen (req->sv1);
1203	req->int1 = flags;
1204	req->int2 = mode;
1205
1206	EIO_SEND;
1207	}
1208
1209	void
1210	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
1211	PROTOTYPE: $;$
1212	ALIAS:
1213	aio_fsync = EIO_FSYNC
1214	aio_fdatasync = EIO_FDATASYNC
1215	PPCODE:
1216	{
1217	dREQ;
1218
1219	req->type = ix;
1220	req->sv1 = newSVsv (fh);
1221	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1222
1223	EIO_SEND (req);
1224	}
1225
1226	void
1227	aio_close (SV *fh, SV *callback=&PL_sv_undef)
1228	PROTOTYPE: $;$
1229	PPCODE:
1230	{
1231	dREQ;
1232
1233	req->type = EIO_CLOSE;
1234	req->sv1 = newSVsv (fh);
1235	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1236
1237	EIO_SEND (req);
1238	}
1239
1240	void
1241	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
1242	ALIAS:
1243	aio_read = EIO_READ
1244	aio_write = EIO_WRITE
1245	PROTOTYPE: $$$$$;$
1246	PPCODE:
1247	{
1248	STRLEN svlen;
1249	char *svptr = SvPVbyte (data, svlen);
1250	UV len = SvUV (length);
1251
1252	SvUPGRADE (data, SVt_PV);
1253	SvPOK_on (data);
1254
1255	if (dataoffset < 0)
1256	dataoffset += svlen;
1257
1258	if (dataoffset < 0 || dataoffset > svlen)
1259	croak ("dataoffset outside of data scalar");
1260
1261	if (ix == EIO_WRITE)
1262	{
1263	/* write: check length and adjust. */
1264	if (!SvOK (length) || len + dataoffset > svlen)
1265	len = svlen - dataoffset;
1266	}
1267	else
1268	{
1269	/* read: grow scalar as necessary */
1270	svptr = SvGROW (data, len + dataoffset + 1);
1271	}
1272
1273	if (len < 0)
1274	croak ("length must not be negative");
1275
1276	{
1277	dREQ;
1278
1279	req->type = ix;
1280	req->sv1 = newSVsv (fh);
1281	req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
1282	: IoOFP (sv_2io (fh)));
1283	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
1284	req->size = len;
1285	req->sv2 = SvREFCNT_inc (data);
1286	req->ptr2 = (char *)svptr + dataoffset;
1287	req->stroffset = dataoffset;
1288
1289	if (!SvREADONLY (data))
1290	{
1291	SvREADONLY_on (data);
1292	req->flags |= FLAG_SV2_RO_OFF;
1293	}
1294
1295	EIO_SEND;
1296	}
1297	}
1298
1299	void
1300	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
1301	PROTOTYPE: $$;$
1302	PPCODE:
1303	{
1304	SV *data;
1305	dREQ;
1306
1307	data = newSV (NAME_MAX);
1308	SvPOK_on (data);
1309
1310	req->type = EIO_READLINK;
1311	req->sv1 = newSVsv (path);
1312	req->ptr1 = SvPVbyte_nolen (req->sv1);
1313	req->sv2 = data;
1314	req->ptr2 = SvPVbyte_nolen (data);
1315
1316	EIO_SEND;
1317	}
1318
1319	void
1320	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
1321	PROTOTYPE: $$$$;$
1322	PPCODE:
1323	{
1324	dREQ;
1325
1326	req->type = EIO_SENDFILE;
1327	req->sv1 = newSVsv (out_fh);
1328	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1329	req->sv2 = newSVsv (in_fh);
1330	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1331	req->offs = SvVAL64 (in_offset);
1332	req->size = length;
1333
1334	EIO_SEND;
1335	}
1336
1337	void
1338	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
1339	PROTOTYPE: $$$;$
1340	PPCODE:
1341	{
1342	dREQ;
1343
1344	req->type = EIO_READAHEAD;
1345	req->sv1 = newSVsv (fh);
1346	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1347	req->offs = SvVAL64 (offset);
1348	req->size = length;
1349
1350	EIO_SEND;
1351	}
1352
1353	void
1354	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
1355	ALIAS:
1356	aio_stat = EIO_STAT
1357	aio_lstat = EIO_LSTAT
1358	PPCODE:
1359	{
1360	dREQ;
1361
1362	req->ptr2 = malloc (sizeof (EIO_STRUCT_STAT));
1363	if (!req->ptr2)
1364	{
1365	req_destroy (req);
1366	croak ("out of memory during aio_stat statdata allocation");
1367	}
1368
1369	req->flags |= FLAG_PTR2_FREE;
1370	req->sv1 = newSVsv (fh_or_path);
1371
1372	if (SvPOK (fh_or_path))
1373	{
1374	req->type = ix;
1375	req->ptr1 = SvPVbyte_nolen (req->sv1);
1376	}
1377	else
1378	{
1379	req->type = EIO_FSTAT;
1380	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1381	}
1382
1383	EIO_SEND;
1384	}
1385
1386	void
1387	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
1388	PPCODE:
1389	{
1390	dREQ;
1391
1392	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
1393	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
1394	req->sv1 = newSVsv (fh_or_path);
1395
1396	if (SvPOK (fh_or_path))
1397	{
1398	req->type = EIO_UTIME;
1399	req->ptr1 = SvPVbyte_nolen (req->sv1);
1400	}
1401	else
1402	{
1403	req->type = EIO_FUTIME;
1404	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1405	}
1406
1407	EIO_SEND;
1408	}
1409
1410	void
1411	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
1412	PPCODE:
1413	{
1414	dREQ;
1415
1416	req->sv1 = newSVsv (fh_or_path);
1417	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
1418
1419	if (SvPOK (fh_or_path))
1420	{
1421	req->type = EIO_TRUNCATE;
1422	req->ptr1 = SvPVbyte_nolen (req->sv1);
1423	}
1424	else
1425	{
1426	req->type = EIO_FTRUNCATE;
1427	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1428	}
1429
1430	EIO_SEND;
1431	}
1432
1433	void
1434	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
1435	ALIAS:
1436	aio_chmod = EIO_CHMOD
1437	aio_fchmod = EIO_FCHMOD
1438	aio_mkdir = EIO_MKDIR
1439	PPCODE:
1440	{
1441	dREQ;
1442
1443	req->type = type;
1444	req->int2 = mode;
1445	req->sv1 = newSVsv (fh_or_path);
1446
1447	if (ix == EIO_FCHMOD)
1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1449	else
1450	req->ptr1 = SvPVbyte_nolen (req->sv1);
1451
1452	EIO_SEND;
1453	}
1454
1455	void
1456	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
1457	PPCODE:
1458	{
1459	dREQ;
1460
1461	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
1462	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
1463	req->sv1 = newSVsv (fh_or_path);
1464
1465	if (SvPOK (fh_or_path))
1466	{
1467	req->type = EIO_CHOWN;
1468	req->ptr1 = SvPVbyte_nolen (req->sv1);
1469	}
1470	else
1471	{
1472	req->type = EIO_FCHOWN;
1473	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1474	}
1475
1476	EIO_SEND;
1477	}
1478
1479	void
1480	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
1481	ALIAS:
1482	aio_unlink = EIO_UNLINK
1483	aio_rmdir = EIO_RMDIR
1484	aio_readdir = EIO_READDIR
1485	PPCODE:
1486	{
1487	dREQ;
1488
1489	req->type = ix;
1490	req->sv1 = newSVsv (pathname);
1491	req->ptr1 = SvPVbyte_nolen (req->sv1);
1492
1493	EIO_SEND;
1494	}
1495
1496	void
1497	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
1498	ALIAS:
1499	aio_link = EIO_LINK
1500	aio_symlink = EIO_SYMLINK
1501	aio_rename = EIO_RENAME
1502	PPCODE:
1503	{
1504	dREQ;
1505
1506	req->type = ix;
1507	req->sv1 = newSVsv (oldpath);
1508	req->ptr1 = SvPVbyte_nolen (req->sv1);
1509	req->sv2 = newSVsv (newpath);
1510	req->ptr2 = SvPVbyte_nolen (req->sv2);
1511
1512	EIO_SEND;
1513	}
1514
1515	void
1516	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
1517	PPCODE:
1518	{
1519	dREQ;
1520
1521	req->type = EIO_MKNOD;
1522	req->sv1 = newSVsv (pathname);
1523	req->ptr1 = SvPVbyte_nolen (req->sv1);
1524	req->int2 = (mode_t)mode;
1525	req->offs = dev;
1526
1527	EIO_SEND;
1528	}
1529
1530	void
1531	aio_busy (double delay, SV *callback=&PL_sv_undef)
1532	PPCODE:
1533	{
1534	dREQ;
1535
1536	req->type = EIO_BUSY;
1537	req->nv1 = delay < 0. ? 0. : delay;
1538
1539	EIO_SEND;
1540	}
1541
1542	void
1543	aio_group (SV *callback=&PL_sv_undef)
1544	PROTOTYPE: ;$
1545	PPCODE:
1546	{
1547	dREQ;
1548
1549	req->type = EIO_GROUP;
1550
1551	req_send (req);
1552	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1553	}
1554
1555	void
1556	aio_nop (SV *callback=&PL_sv_undef)
1557	ALIAS:
1558	aio_nop = EIO_NOP
1559	aio_sync = EIO_SYNC
1560	PPCODE:
1561	{
1562	dREQ;
1563
1564	#endif
1565		1433
1566	void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit)	1434	void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit)
1567	{	1435	{
1568	grp->int2 = limit;	1436	grp->int2 = limit;
1569	grp->feed = feed;	1437	grp->feed = feed;
…		…
1592	grp->grp_first->grp_prev = req;	1460	grp->grp_first->grp_prev = req;
1593		1461
1594	grp->grp_first = req;	1462	grp->grp_first = req;
1595	}	1463	}
1596		1464
		1465	/*****************************************************************************/
		1466	/* misc garbage */
1597		1467
		1468	ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count)
		1469	{
		1470	etp_worker wrk;
		1471
		1472	wrk.dbuf = 0;
		1473
		1474	eio__sendfile (ofd, ifd, offset, count, &wrk);
		1475
		1476	if (wrk.dbuf)
		1477	free (wrk.dbuf);
		1478	}
		1479

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