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Comparing libeio/eio.c (file contents):
Revision 1.10 by root, Tue May 13 17:08:15 2008 UTC vs.
Revision 1.31 by root, Sat Jun 6 17:25:13 2009 UTC

		1	/*
		2	* libeio implementation
		3	*
		4	* Copyright (c) 2007,2008,2009 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"
		41
		42	#ifdef EIO_STACKSIZE
		43	# define XTHREAD_STACKSIZE EIO_STACKSIZE
		44	#endif
2	#include "xthread.h"	45	#include "xthread.h"
3		46
4	#include <errno.h>	47	#include <errno.h>
5	#include <stddef.h>	48	#include <stddef.h>
6	#include <stdlib.h>	49	#include <stdlib.h>
…		…
25	#endif	68	#endif
26		69
27	#ifdef _WIN32	70	#ifdef _WIN32
28		71
29	/*doh*/	72	/*doh*/
30
31	#else	73	#else
32		74
33	# include "config.h"	75	# include "config.h"
34	# include <sys/time.h>	76	# include <sys/time.h>
35	# include <sys/select.h>	77	# include <sys/select.h>
36	# include <unistd.h>	78	# include <unistd.h>
37	# include <utime.h>	79	# include <utime.h>
38	# include <signal.h>	80	# include <signal.h>
39	# include <dirent.h>	81	# include <dirent.h>
		82
		83	/* POSIX_SOURCE is useless on bsd's, and XOPEN_SOURCE is unreliable there, too */
		84	# if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
		85	# define D_INO(de) (de)->d_fileno
		86	# define _DIRENT_HAVE_D_TYPE /* sigh */
		87	# elif defined(__linux) || defined(d_ino) || _XOPEN_SOURCE >= 600
		88	# define D_INO(de) (de)->d_ino
		89	# endif
		90
		91	# ifdef _DIRENT_HAVE_D_TYPE
		92	# define D_TYPE(de) (de)->d_type
		93	# endif
40		94
41	# ifndef EIO_STRUCT_DIRENT	95	# ifndef EIO_STRUCT_DIRENT
42	# define EIO_STRUCT_DIRENT struct dirent	96	# define EIO_STRUCT_DIRENT struct dirent
43	# endif	97	# endif
44		98
…		…
57	# else	111	# else
58	# error sendfile support requested but not available	112	# error sendfile support requested but not available
59	# endif	113	# endif
60	#endif	114	#endif
61		115
		116	#ifndef D_TYPE
		117	# define D_TYPE(de) 0
		118	#endif
		119
		120	#ifndef D_INO
		121	# define D_INO(de) 0
		122	#endif
		123
62	/* number of seconds after which an idle threads exit */	124	/* number of seconds after which an idle threads exit */
63	#define IDLE_TIMEOUT 10	125	#define IDLE_TIMEOUT 10
64		126
65	/* used for struct dirent, AIX doesn't provide it */	127	/* used for struct dirent, AIX doesn't provide it */
66	#ifndef NAME_MAX	128	#ifndef NAME_MAX
…		…
70	/* buffer size for various temporary buffers */	132	/* buffer size for various temporary buffers */
71	#define EIO_BUFSIZE 65536	133	#define EIO_BUFSIZE 65536
72		134
73	#define dBUF \	135	#define dBUF \
74	char *eio_buf; \	136	char *eio_buf; \
75	X_LOCK (wrklock); \	137	ETP_WORKER_LOCK (self); \
76	self->dbuf = eio_buf = malloc (EIO_BUFSIZE); \	138	self->dbuf = eio_buf = malloc (EIO_BUFSIZE); \
77	X_UNLOCK (wrklock); \	139	ETP_WORKER_UNLOCK (self); \
78	errno = ENOMEM; \	140	errno = ENOMEM; \
79	if (!eio_buf) \	141	if (!eio_buf) \
80	return -1;	142	return -1;
81		143
82	#define EIO_TICKS ((1000000 + 1023) >> 10)	144	#define EIO_TICKS ((1000000 + 1023) >> 10)
83		145
		146	/*****************************************************************************/
		147
		148	#if __GNUC__ >= 3
		149	# define expect(expr,value) __builtin_expect ((expr),(value))
		150	#else
		151	# define expect(expr,value) (expr)
		152	#endif
		153
		154	#define expect_false(expr) expect ((expr) != 0, 0)
		155	#define expect_true(expr) expect ((expr) != 0, 1)
		156
		157	/*****************************************************************************/
		158
		159	#define ETP_PRI_MIN EIO_PRI_MIN
		160	#define ETP_PRI_MAX EIO_PRI_MAX
		161
		162	struct etp_worker;
		163
		164	#define ETP_REQ eio_req
		165	#define ETP_DESTROY(req) eio_destroy (req)
		166	static int eio_finish (eio_req *req);
		167	#define ETP_FINISH(req) eio_finish (req)
		168	static void eio_execute (struct etp_worker *self, eio_req *req);
		169	#define ETP_EXECUTE(wrk,req) eio_execute (wrk,req)
		170
		171	#define ETP_WORKER_CLEAR(req) \
		172	if (wrk->dbuf) \
		173	{ \
		174	free (wrk->dbuf); \
		175	wrk->dbuf = 0; \
		176	} \
		177	\
		178	if (wrk->dirp) \
		179	{ \
		180	closedir (wrk->dirp); \
		181	wrk->dirp = 0; \
		182	}
		183	#define ETP_WORKER_COMMON \
		184	void *dbuf; \
		185	DIR *dirp;
		186
		187	/*****************************************************************************/
		188
		189	#define ETP_NUM_PRI (ETP_PRI_MAX - ETP_PRI_MIN + 1)
		190
		191	/* calculcate time difference in ~1/EIO_TICKS of a second */
		192	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		193	{
		194	return (tv2->tv_sec - tv1->tv_sec ) * EIO_TICKS
		195	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		196	}
		197
		198	static unsigned int started, idle, wanted = 4;
		199
84	static void (*want_poll_cb) (void);	200	static void (*want_poll_cb) (void);
85	static void (*done_poll_cb) (void);	201	static void (*done_poll_cb) (void);
86		202
87	static unsigned int max_poll_time = 0;	203	static unsigned int max_poll_time; /* reslock */
88	static unsigned int max_poll_reqs = 0;	204	static unsigned int max_poll_reqs; /* reslock */
89		205
90	/* calculcate time difference in ~1/EIO_TICKS of a second */	206	static volatile unsigned int nreqs; /* reqlock */
91	static int tvdiff (struct timeval *tv1, struct timeval *tv2)	207	static volatile unsigned int nready; /* reqlock */
92	{	208	static volatile unsigned int npending; /* reqlock */
93	return (tv2->tv_sec - tv1->tv_sec ) * EIO_TICKS	209	static volatile unsigned int max_idle = 4;
94	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
95	}
96		210
97	static unsigned int started, idle, wanted = 4;
98
99	/* worker threads management */
100	static mutex_t wrklock = X_MUTEX_INIT;	211	static mutex_t wrklock = X_MUTEX_INIT;
101
102	typedef struct worker
103	{
104	/* locked by wrklock */
105	struct worker *prev, *next;
106
107	thread_t tid;
108
109	/* locked by reslock, reqlock or wrklock */
110	eio_req *req; /* currently processed request */
111	void *dbuf;
112	DIR *dirp;
113	} worker;
114
115	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
116
117	static void worker_clear (worker *wrk)
118	{
119	if (wrk->dirp)
120	{
121	closedir (wrk->dirp);
122	wrk->dirp = 0;
123	}
124
125	if (wrk->dbuf)
126	{
127	free (wrk->dbuf);
128	wrk->dbuf = 0;
129	}
130	}
131
132	static void worker_free (worker *wrk)
133	{
134	wrk->next->prev = wrk->prev;
135	wrk->prev->next = wrk->next;
136
137	free (wrk);
138	}
139
140	static volatile unsigned int nreqs, nready, npending;
141	static volatile unsigned int max_idle = 4;
142
143	static mutex_t reslock = X_MUTEX_INIT;	212	static mutex_t reslock = X_MUTEX_INIT;
144	static mutex_t reqlock = X_MUTEX_INIT;	213	static mutex_t reqlock = X_MUTEX_INIT;
145	static cond_t reqwait = X_COND_INIT;	214	static cond_t reqwait = X_COND_INIT;
146		215
		216	#if !HAVE_PREADWRITE
		217	/*
		218	* make our pread/pwrite emulation safe against themselves, but not against
		219	* normal read/write by using a mutex. slows down execution a lot,
		220	* but that's your problem, not mine.
		221	*/
		222	static mutex_t preadwritelock = X_MUTEX_INIT;
		223	#endif
		224
		225	typedef struct etp_worker
		226	{
		227	/* locked by wrklock */
		228	struct etp_worker *prev, *next;
		229
		230	thread_t tid;
		231
		232	/* locked by reslock, reqlock or wrklock */
		233	ETP_REQ *req; /* currently processed request */
		234
		235	ETP_WORKER_COMMON
		236	} etp_worker;
		237
		238	static etp_worker wrk_first = { &wrk_first, &wrk_first, 0 }; /* NOT etp */
		239
		240	#define ETP_WORKER_LOCK(wrk) X_LOCK (wrklock)
		241	#define ETP_WORKER_UNLOCK(wrk) X_UNLOCK (wrklock)
		242
		243	/* worker threads management */
		244
		245	static void etp_worker_clear (etp_worker *wrk)
		246	{
		247	ETP_WORKER_CLEAR (wrk);
		248	}
		249
		250	static void etp_worker_free (etp_worker *wrk)
		251	{
		252	wrk->next->prev = wrk->prev;
		253	wrk->prev->next = wrk->next;
		254
		255	free (wrk);
		256	}
		257
147	unsigned int eio_nreqs (void)	258	static unsigned int etp_nreqs (void)
148	{	259	{
		260	int retval;
		261	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
		262	retval = nreqs;
		263	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
149	return nreqs;	264	return retval;
150	}	265	}
151		266
152	unsigned int eio_nready (void)	267	static unsigned int etp_nready (void)
153	{	268	{
154	unsigned int retval;	269	unsigned int retval;
155		270
156	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);	271	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
157	retval = nready;	272	retval = nready;
158	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);	273	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
159		274
160	return retval;	275	return retval;
161	}	276	}
162		277
163	unsigned int eio_npending (void)	278	static unsigned int etp_npending (void)
164	{	279	{
165	unsigned int retval;	280	unsigned int retval;
166		281
167	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);	282	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
168	retval = npending;	283	retval = npending;
169	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);	284	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
170		285
171	return retval;	286	return retval;
172	}	287	}
173		288
174	unsigned int eio_nthreads (void)	289	static unsigned int etp_nthreads (void)
175	{	290	{
176	unsigned int retval;	291	unsigned int retval;
177		292
178	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);	293	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
179	retval = started;	294	retval = started;
…		…
186	* a somewhat faster data structure might be nice, but	301	* a somewhat faster data structure might be nice, but
187	* with 8 priorities this actually needs <20 insns	302	* with 8 priorities this actually needs <20 insns
188	* per shift, the most expensive operation.	303	* per shift, the most expensive operation.
189	*/	304	*/
190	typedef struct {	305	typedef struct {
191	eio_req *qs[EIO_NUM_PRI], *qe[EIO_NUM_PRI]; /* qstart, qend */	306	ETP_REQ *qs[ETP_NUM_PRI], *qe[ETP_NUM_PRI]; /* qstart, qend */
192	int size;	307	int size;
193	} reqq;	308	} etp_reqq;
194		309
195	static reqq req_queue;	310	static etp_reqq req_queue;
196	static reqq res_queue;	311	static etp_reqq res_queue;
197		312
198	static int reqq_push (reqq *q, eio_req *req)	313	static int reqq_push (etp_reqq *q, ETP_REQ *req)
199	{	314	{
200	int pri = req->pri;	315	int pri = req->pri;
201	req->next = 0;	316	req->next = 0;
202		317
203	if (q->qe[pri])	318	if (q->qe[pri])
…		…
209	q->qe[pri] = q->qs[pri] = req;	324	q->qe[pri] = q->qs[pri] = req;
210		325
211	return q->size++;	326	return q->size++;
212	}	327	}
213		328
214	static eio_req *reqq_shift (reqq *q)	329	static ETP_REQ *reqq_shift (etp_reqq *q)
215	{	330	{
216	int pri;	331	int pri;
217		332
218	if (!q->size)	333	if (!q->size)
219	return 0;	334	return 0;
220		335
221	--q->size;	336	--q->size;
222		337
223	for (pri = EIO_NUM_PRI; pri--; )	338	for (pri = ETP_NUM_PRI; pri--; )
224	{	339	{
225	eio_req *req = q->qs[pri];	340	eio_req *req = q->qs[pri];
226		341
227	if (req)	342	if (req)
228	{	343	{
…		…
234	}	349	}
235		350
236	abort ();	351	abort ();
237	}	352	}
238		353
239	static void grp_try_feed (eio_req *grp)	354	static void etp_atfork_prepare (void)
240	{	355	{
241	while (grp->size < grp->int2 && !EIO_CANCELLED (grp))	356	X_LOCK (wrklock);
		357	X_LOCK (reqlock);
		358	X_LOCK (reslock);
		359	#if !HAVE_PREADWRITE
		360	X_LOCK (preadwritelock);
		361	#endif
		362	}
		363
		364	static void etp_atfork_parent (void)
		365	{
		366	#if !HAVE_PREADWRITE
		367	X_UNLOCK (preadwritelock);
		368	#endif
		369	X_UNLOCK (reslock);
		370	X_UNLOCK (reqlock);
		371	X_UNLOCK (wrklock);
		372	}
		373
		374	static void etp_atfork_child (void)
		375	{
		376	ETP_REQ *prv;
		377
		378	while ((prv = reqq_shift (&req_queue)))
		379	ETP_DESTROY (prv);
		380
		381	while ((prv = reqq_shift (&res_queue)))
		382	ETP_DESTROY (prv);
		383
		384	while (wrk_first.next != &wrk_first)
242	{	385	{
243	int old_len = grp->size;	386	etp_worker *wrk = wrk_first.next;
244		387
245	EIO_FEED (grp);	388	if (wrk->req)
		389	ETP_DESTROY (wrk->req);
246		390
247	/* stop if no progress has been made */	391	etp_worker_clear (wrk);
248	if (old_len == grp->size)	392	etp_worker_free (wrk);
249	{
250	grp->feed = 0;
251	break;
252	}
253	}	393	}
254	}
255		394
256	static int eio_finish (eio_req *req);	395	started = 0;
		396	idle = 0;
		397	nreqs = 0;
		398	nready = 0;
		399	npending = 0;
257		400
258	static int grp_dec (eio_req *grp)	401	etp_atfork_parent ();
259	{	402	}
260	--grp->size;
261		403
262	/* call feeder, if applicable */	404	static void
263	grp_try_feed (grp);	405	etp_once_init (void)
		406	{
		407	X_THREAD_ATFORK (etp_atfork_prepare, etp_atfork_parent, etp_atfork_child);
		408	}
264		409
265	/* finish, if done */	410	static int
266	if (!grp->size && grp->int1)	411	etp_init (void (*want_poll)(void), void (*done_poll)(void))
267	return eio_finish (grp);	412	{
268	else	413	static pthread_once_t doinit = PTHREAD_ONCE_INIT;
		414
		415	pthread_once (&doinit, etp_once_init);
		416
		417	want_poll_cb = want_poll;
		418	done_poll_cb = done_poll;
		419
269	return 0;	420	return 0;
270	}	421	}
271		422
272	void eio_destroy (eio_req *req)
273	{
274	if ((req)->flags & EIO_FLAG_PTR1_FREE) free (req->ptr1);
275	if ((req)->flags & EIO_FLAG_PTR2_FREE) free (req->ptr2);
276
277	EIO_DESTROY (req);
278	}
279
280	static int eio_finish (eio_req *req)
281	{
282	int res = EIO_FINISH (req);
283
284	if (req->grp)
285	{
286	int res2;
287	eio_req *grp = req->grp;
288
289	/* unlink request */
290	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
291	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
292
293	if (grp->grp_first == req)
294	grp->grp_first = req->grp_next;
295
296	res2 = grp_dec (grp);
297
298	if (!res && res2)
299	res = res2;
300	}
301
302	eio_destroy (req);
303
304	return res;
305	}
306
307	void eio_grp_cancel (eio_req *grp)
308	{
309	for (grp = grp->grp_first; grp; grp = grp->grp_next)
310	eio_cancel (grp);
311	}
312
313	void eio_cancel (eio_req *req)
314	{
315	X_LOCK (wrklock);
316	req->flags |= EIO_FLAG_CANCELLED;
317	X_UNLOCK (wrklock);
318
319	eio_grp_cancel (req);
320	}
321
322	X_THREAD_PROC (eio_proc);	423	X_THREAD_PROC (etp_proc);
323		424
324	static void start_thread (void)	425	static void etp_start_thread (void)
325	{	426	{
326	worker *wrk = calloc (1, sizeof (worker));	427	etp_worker *wrk = calloc (1, sizeof (etp_worker));
327		428
328	/*TODO*/	429	/*TODO*/
329	assert (("unable to allocate worker thread data", wrk));	430	assert (("unable to allocate worker thread data", wrk));
330		431
331	X_LOCK (wrklock);	432	X_LOCK (wrklock);
332		433
333	if (thread_create (&wrk->tid, eio_proc, (void *)wrk))	434	if (thread_create (&wrk->tid, etp_proc, (void *)wrk))
334	{	435	{
335	wrk->prev = &wrk_first;	436	wrk->prev = &wrk_first;
336	wrk->next = wrk_first.next;	437	wrk->next = wrk_first.next;
337	wrk_first.next->prev = wrk;	438	wrk_first.next->prev = wrk;
338	wrk_first.next = wrk;	439	wrk_first.next = wrk;
…		…
342	free (wrk);	443	free (wrk);
343		444
344	X_UNLOCK (wrklock);	445	X_UNLOCK (wrklock);
345	}	446	}
346		447
347	static void maybe_start_thread (void)	448	static void etp_maybe_start_thread (void)
348	{	449	{
349	if (eio_nthreads () >= wanted)	450	if (expect_true (etp_nthreads () >= wanted))
350	return;	451	return;
351		452
352	/* todo: maybe use idle here, but might be less exact */	453	/* todo: maybe use idle here, but might be less exact */
353	if (0 <= (int)eio_nthreads () + (int)eio_npending () - (int)eio_nreqs ())	454	if (expect_true (0 <= (int)etp_nthreads () + (int)etp_npending () - (int)etp_nreqs ()))
354	return;	455	return;
355		456
356	start_thread ();	457	etp_start_thread ();
357	}	458	}
358		459
359	void eio_submit (eio_req *req)
360	{
361	++nreqs;
362
363	X_LOCK (reqlock);
364	++nready;
365	reqq_push (&req_queue, req);
366	X_COND_SIGNAL (reqwait);
367	X_UNLOCK (reqlock);
368
369	maybe_start_thread ();
370	}
371
372	static void end_thread (void)	460	static void etp_end_thread (void)
373	{	461	{
374	eio_req *req = calloc (1, sizeof (eio_req));	462	eio_req *req = calloc (1, sizeof (eio_req));
375		463
376	req->type = EIO_QUIT;	464	req->type = -1;
377	req->pri = EIO_PRI_MAX + EIO_PRI_BIAS;	465	req->pri = ETP_PRI_MAX - ETP_PRI_MIN;
378		466
379	X_LOCK (reqlock);	467	X_LOCK (reqlock);
380	reqq_push (&req_queue, req);	468	reqq_push (&req_queue, req);
381	X_COND_SIGNAL (reqwait);	469	X_COND_SIGNAL (reqwait);
382	X_UNLOCK (reqlock);	470	X_UNLOCK (reqlock);
…		…
384	X_LOCK (wrklock);	472	X_LOCK (wrklock);
385	--started;	473	--started;
386	X_UNLOCK (wrklock);	474	X_UNLOCK (wrklock);
387	}	475	}
388		476
389	void eio_set_max_poll_time (double nseconds)
390	{
391	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
392	max_poll_time = nseconds;
393	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
394	}
395
396	void eio_set_max_poll_reqs (unsigned int maxreqs)
397	{
398	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
399	max_poll_reqs = maxreqs;
400	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
401	}
402
403	void eio_set_max_idle (unsigned int nthreads)
404	{
405	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
406	max_idle = nthreads <= 0 ? 1 : nthreads;
407	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
408	}
409
410	void eio_set_min_parallel (unsigned int nthreads)
411	{
412	if (wanted < nthreads)
413	wanted = nthreads;
414	}
415
416	void eio_set_max_parallel (unsigned int nthreads)
417	{
418	if (wanted > nthreads)
419	wanted = nthreads;
420
421	while (started > wanted)
422	end_thread ();
423	}
424
425	int eio_poll (void)	477	static int etp_poll (void)
426	{	478	{
427	int maxreqs = max_poll_reqs;	479	unsigned int maxreqs;
		480	unsigned int maxtime;
428	struct timeval tv_start, tv_now;	481	struct timeval tv_start, tv_now;
429	eio_req *req;
430		482
		483	X_LOCK (reslock);
		484	maxreqs = max_poll_reqs;
		485	maxtime = max_poll_time;
		486	X_UNLOCK (reslock);
		487
431	if (max_poll_time)	488	if (maxtime)
432	gettimeofday (&tv_start, 0);	489	gettimeofday (&tv_start, 0);
433		490
434	for (;;)	491	for (;;)
435	{	492	{
		493	ETP_REQ *req;
		494
436	maybe_start_thread ();	495	etp_maybe_start_thread ();
437		496
438	X_LOCK (reslock);	497	X_LOCK (reslock);
439	req = reqq_shift (&res_queue);	498	req = reqq_shift (&res_queue);
440		499
441	if (req)	500	if (req)
…		…
449	X_UNLOCK (reslock);	508	X_UNLOCK (reslock);
450		509
451	if (!req)	510	if (!req)
452	return 0;	511	return 0;
453		512
		513	X_LOCK (reqlock);
454	--nreqs;	514	--nreqs;
		515	X_UNLOCK (reqlock);
455		516
456	if (req->type == EIO_GROUP && req->size)	517	if (expect_false (req->type == EIO_GROUP && req->size))
457	{	518	{
458	req->int1 = 1; /* mark request as delayed */	519	req->int1 = 1; /* mark request as delayed */
459	continue;	520	continue;
460	}	521	}
461	else	522	else
462	{	523	{
463	int res = eio_finish (req);	524	int res = ETP_FINISH (req);
464	if (res)	525	if (expect_false (res))
465	return res;	526	return res;
466	}	527	}
467		528
468	if (maxreqs && !--maxreqs)	529	if (expect_false (maxreqs && !--maxreqs))
469	break;	530	break;
470		531
471	if (max_poll_time)	532	if (maxtime)
472	{	533	{
473	gettimeofday (&tv_now, 0);	534	gettimeofday (&tv_now, 0);
474		535
475	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)	536	if (tvdiff (&tv_start, &tv_now) >= maxtime)
476	break;	537	break;
477	}	538	}
478	}	539	}
479		540
480	errno = EAGAIN;	541	errno = EAGAIN;
481	return -1;	542	return -1;
482	}	543	}
483		544
		545	static void etp_cancel (ETP_REQ *req)
		546	{
		547	X_LOCK (wrklock);
		548	req->flags |= EIO_FLAG_CANCELLED;
		549	X_UNLOCK (wrklock);
		550
		551	eio_grp_cancel (req);
		552	}
		553
		554	static void etp_submit (ETP_REQ *req)
		555	{
		556	req->pri -= ETP_PRI_MIN;
		557
		558	if (expect_false (req->pri < ETP_PRI_MIN - ETP_PRI_MIN)) req->pri = ETP_PRI_MIN - ETP_PRI_MIN;
		559	if (expect_false (req->pri > ETP_PRI_MAX - ETP_PRI_MIN)) req->pri = ETP_PRI_MAX - ETP_PRI_MIN;
		560
		561	if (expect_false (req->type == EIO_GROUP))
		562	{
		563	/* I hope this is worth it :/ */
		564	X_LOCK (reqlock);
		565	++nreqs;
		566	X_UNLOCK (reqlock);
		567
		568	X_LOCK (reslock);
		569
		570	++npending;
		571
		572	if (!reqq_push (&res_queue, req) && want_poll_cb)
		573	want_poll_cb ();
		574
		575	X_UNLOCK (reslock);
		576	}
		577	else
		578	{
		579	X_LOCK (reqlock);
		580	++nreqs;
		581	++nready;
		582	reqq_push (&req_queue, req);
		583	X_COND_SIGNAL (reqwait);
		584	X_UNLOCK (reqlock);
		585
		586	etp_maybe_start_thread ();
		587	}
		588	}
		589
		590	static void etp_set_max_poll_time (double nseconds)
		591	{
		592	if (WORDACCESS_UNSAFE) X_LOCK (reslock);
		593	max_poll_time = nseconds;
		594	if (WORDACCESS_UNSAFE) X_UNLOCK (reslock);
		595	}
		596
		597	static void etp_set_max_poll_reqs (unsigned int maxreqs)
		598	{
		599	if (WORDACCESS_UNSAFE) X_LOCK (reslock);
		600	max_poll_reqs = maxreqs;
		601	if (WORDACCESS_UNSAFE) X_UNLOCK (reslock);
		602	}
		603
		604	static void etp_set_max_idle (unsigned int nthreads)
		605	{
		606	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
		607	max_idle = nthreads <= 0 ? 1 : nthreads;
		608	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
		609	}
		610
		611	static void etp_set_min_parallel (unsigned int nthreads)
		612	{
		613	if (wanted < nthreads)
		614	wanted = nthreads;
		615	}
		616
		617	static void etp_set_max_parallel (unsigned int nthreads)
		618	{
		619	if (wanted > nthreads)
		620	wanted = nthreads;
		621
		622	while (started > wanted)
		623	etp_end_thread ();
		624	}
		625
		626	/*****************************************************************************/
		627
		628	static void grp_try_feed (eio_req *grp)
		629	{
		630	while (grp->size < grp->int2 && !EIO_CANCELLED (grp))
		631	{
		632	grp->flags &= ~EIO_FLAG_GROUPADD;
		633
		634	EIO_FEED (grp);
		635
		636	/* stop if no progress has been made */
		637	if (!(grp->flags & EIO_FLAG_GROUPADD))
		638	{
		639	grp->feed = 0;
		640	break;
		641	}
		642	}
		643	}
		644
		645	static int grp_dec (eio_req *grp)
		646	{
		647	--grp->size;
		648
		649	/* call feeder, if applicable */
		650	grp_try_feed (grp);
		651
		652	/* finish, if done */
		653	if (!grp->size && grp->int1)
		654	return eio_finish (grp);
		655	else
		656	return 0;
		657	}
		658
		659	void eio_destroy (eio_req *req)
		660	{
		661	if ((req)->flags & EIO_FLAG_PTR1_FREE) free (req->ptr1);
		662	if ((req)->flags & EIO_FLAG_PTR2_FREE) free (req->ptr2);
		663
		664	EIO_DESTROY (req);
		665	}
		666
		667	static int eio_finish (eio_req *req)
		668	{
		669	int res = EIO_FINISH (req);
		670
		671	if (req->grp)
		672	{
		673	int res2;
		674	eio_req *grp = req->grp;
		675
		676	/* unlink request */
		677	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		678	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		679
		680	if (grp->grp_first == req)
		681	grp->grp_first = req->grp_next;
		682
		683	res2 = grp_dec (grp);
		684
		685	if (!res && res2)
		686	res = res2;
		687	}
		688
		689	eio_destroy (req);
		690
		691	return res;
		692	}
		693
		694	void eio_grp_cancel (eio_req *grp)
		695	{
		696	for (grp = grp->grp_first; grp; grp = grp->grp_next)
		697	eio_cancel (grp);
		698	}
		699
		700	void eio_cancel (eio_req *req)
		701	{
		702	etp_cancel (req);
		703	}
		704
		705	void eio_submit (eio_req *req)
		706	{
		707	etp_submit (req);
		708	}
		709
		710	unsigned int eio_nreqs (void)
		711	{
		712	return etp_nreqs ();
		713	}
		714
		715	unsigned int eio_nready (void)
		716	{
		717	return etp_nready ();
		718	}
		719
		720	unsigned int eio_npending (void)
		721	{
		722	return etp_npending ();
		723	}
		724
		725	unsigned int eio_nthreads (void)
		726	{
		727	return etp_nthreads ();
		728	}
		729
		730	void eio_set_max_poll_time (double nseconds)
		731	{
		732	etp_set_max_poll_time (nseconds);
		733	}
		734
		735	void eio_set_max_poll_reqs (unsigned int maxreqs)
		736	{
		737	etp_set_max_poll_reqs (maxreqs);
		738	}
		739
		740	void eio_set_max_idle (unsigned int nthreads)
		741	{
		742	etp_set_max_idle (nthreads);
		743	}
		744
		745	void eio_set_min_parallel (unsigned int nthreads)
		746	{
		747	etp_set_min_parallel (nthreads);
		748	}
		749
		750	void eio_set_max_parallel (unsigned int nthreads)
		751	{
		752	etp_set_max_parallel (nthreads);
		753	}
		754
		755	int eio_poll (void)
		756	{
		757	return etp_poll ();
		758	}
		759
484	/*****************************************************************************/	760	/*****************************************************************************/
485	/* work around various missing functions */	761	/* work around various missing functions */
486		762
487	#if !HAVE_PREADWRITE	763	#if !HAVE_PREADWRITE
		764	# undef pread
		765	# undef pwrite
488	# define pread eio__pread	766	# define pread eio__pread
489	# define pwrite eio__pwrite	767	# define pwrite eio__pwrite
490
491	/*
492	* make our pread/pwrite safe against themselves, but not against
493	* normal read/write by using a mutex. slows down execution a lot,
494	* but that's your problem, not mine.
495	*/
496	static mutex_t preadwritelock = X_MUTEX_INIT;
497		768
498	static ssize_t	769	static ssize_t
499	eio__pread (int fd, void *buf, size_t count, off_t offset)	770	eio__pread (int fd, void *buf, size_t count, off_t offset)
500	{	771	{
501	ssize_t res;	772	ssize_t res;
…		…
519		790
520	X_LOCK (preadwritelock);	791	X_LOCK (preadwritelock);
521	ooffset = lseek (fd, 0, SEEK_CUR);	792	ooffset = lseek (fd, 0, SEEK_CUR);
522	lseek (fd, offset, SEEK_SET);	793	lseek (fd, offset, SEEK_SET);
523	res = write (fd, buf, count);	794	res = write (fd, buf, count);
524	lseek (fd, offset, SEEK_SET);	795	lseek (fd, ooffset, SEEK_SET);
525	X_UNLOCK (preadwritelock);	796	X_UNLOCK (preadwritelock);
526		797
527	return res;	798	return res;
528	}	799	}
529	#endif	800	#endif
530		801
531	#ifndef HAVE_FUTIMES	802	#ifndef HAVE_FUTIMES
532		803
		804	# undef utimes
		805	# undef futimes
533	# define utimes(path,times) eio__utimes (path, times)	806	# define utimes(path,times) eio__utimes (path, times)
534	# define futimes(fd,times) eio__futimes (fd, times)	807	# define futimes(fd,times) eio__futimes (fd, times)
535		808
536	static int	809	static int
537	eio__utimes (const char *filename, const struct timeval times[2])	810	eio__utimes (const char *filename, const struct timeval times[2])
…		…
556	}	829	}
557		830
558	#endif	831	#endif
559		832
560	#if !HAVE_FDATASYNC	833	#if !HAVE_FDATASYNC
		834	# undef fdatasync
561	# define fdatasync fsync	835	# define fdatasync(fd) fsync (fd)
562	#endif	836	#endif
		837
		838	/* sync_file_range always needs emulation */
		839	int
		840	eio__sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags)
		841	{
		842	#if HAVE_SYNC_FILE_RANGE
		843	int res;
		844
		845	if (EIO_SYNC_FILE_RANGE_WAIT_BEFORE != SYNC_FILE_RANGE_WAIT_BEFORE
		846	|| EIO_SYNC_FILE_RANGE_WRITE != SYNC_FILE_RANGE_WRITE
		847	|| EIO_SYNC_FILE_RANGE_WAIT_AFTER != SYNC_FILE_RANGE_WAIT_AFTER)
		848	{
		849	flags = 0
		850	| (flags & EIO_SYNC_FILE_RANGE_WAIT_BEFORE ? SYNC_FILE_RANGE_WAIT_BEFORE : 0)
		851	| (flags & EIO_SYNC_FILE_RANGE_WRITE ? SYNC_FILE_RANGE_WRITE : 0)
		852	| (flags & EIO_SYNC_FILE_RANGE_WAIT_AFTER ? SYNC_FILE_RANGE_WAIT_AFTER : 0);
		853	}
		854
		855	res = sync_file_range (fd, offset, nbytes, flags);
		856
		857	if (!res || errno != ENOSYS)
		858	return res;
		859	#endif
		860
		861	/* even though we could play tricks with the flags, it's better to always
		862	* call fdatasync, as thta matches the expectation of it's users best */
		863	return fdatasync (fd);
		864	}
563		865
564	#if !HAVE_READAHEAD	866	#if !HAVE_READAHEAD
		867	# undef readahead
565	# define readahead(fd,offset,count) eio__readahead (fd, offset, count, self)	868	# define readahead(fd,offset,count) eio__readahead (fd, offset, count, self)
566		869
567	static ssize_t	870	static ssize_t
568	eio__readahead (int fd, off_t offset, size_t count, worker *self)	871	eio__readahead (int fd, off_t offset, size_t count, etp_worker *self)
569	{	872	{
570	size_t todo = count;	873	size_t todo = count;
571	dBUF;	874	dBUF;
572		875
573	while (todo > 0)	876	while (todo > 0)
…		…
583	return count;	886	return count;
584	}	887	}
585		888
586	#endif	889	#endif
587		890
588	#if !HAVE_READDIR_R
589	# define readdir_r eio__readdir_r
590
591	static mutex_t readdirlock = X_MUTEX_INIT;
592
593	static int
594	eio__readdir_r (DIR *dirp, EIO_STRUCT_DIRENT *ent, EIO_STRUCT_DIRENT **res)
595	{
596	EIO_STRUCT_DIRENT *e;
597	int errorno;
598
599	X_LOCK (readdirlock);
600
601	e = readdir (dirp);
602	errorno = errno;
603
604	if (e)
605	{
606	*res = ent;
607	strcpy (ent->d_name, e->d_name);
608	}
609	else
610	*res = 0;
611
612	X_UNLOCK (readdirlock);
613
614	errno = errorno;
615	return e ? 0 : -1;
616	}
617	#endif
618
619	/* sendfile always needs emulation */	891	/* sendfile always needs emulation */
620	static ssize_t	892	static ssize_t
621	eio__sendfile (int ofd, int ifd, off_t offset, size_t count, worker *self)	893	eio__sendfile (int ofd, int ifd, off_t offset, size_t count, etp_worker *self)
622	{	894	{
623	ssize_t res;	895	ssize_t res;
624		896
625	if (!count)	897	if (!count)
626	return 0;	898	return 0;
…		…
708	}	980	}
709		981
710	return res;	982	return res;
711	}	983	}
712		984
		985	static int
		986	eio_dent_cmp (const void *a_, const void *b_)
		987	{
		988	const eio_dirent *a = (const eio_dirent *)a_;
		989	const eio_dirent *b = (const eio_dirent *)b_;
		990
		991	return (int)b->score - (int)a->score ? (int)b->score - (int)a->score
		992	: a->inode < b->inode ? -1 : a->inode > b->inode ? 1 : 0; /* int might be < ino_t */
		993	}
		994
713	/* read a full directory */	995	/* read a full directory */
714	static void	996	static void
715	eio__scandir (eio_req *req, worker *self)	997	eio__scandir (eio_req *req, etp_worker *self)
716	{	998	{
717	DIR *dirp;	999	DIR *dirp;
718	union
719	{
720	EIO_STRUCT_DIRENT d;
721	char b [offsetof (EIO_STRUCT_DIRENT, d_name) + NAME_MAX + 1];
722	} *u;
723	EIO_STRUCT_DIRENT *entp;	1000	EIO_STRUCT_DIRENT *entp;
724	char *name, *names;	1001	unsigned char *name, *names;
725	int memlen = 4096;	1002	int namesalloc = 4096;
726	int memofs = 0;	1003	int namesoffs = 0;
		1004	int flags = req->int1;
		1005	eio_dirent *dents = 0;
		1006	int dentalloc = 128;
727	int res = 0;	1007	int dentoffs = 0;
		1008
		1009	req->result = -1;
		1010
		1011	if (!(flags & EIO_READDIR_DENTS))
		1012	flags &= ~(EIO_READDIR_DIRS_FIRST | EIO_READDIR_STAT_ORDER);
728		1013
729	X_LOCK (wrklock);	1014	X_LOCK (wrklock);
		1015
		1016	/* the corresponding closedir is in ETP_WORKER_CLEAR */
730	self->dirp = dirp = opendir (req->ptr1);	1017	self->dirp = dirp = opendir (req->ptr1);
731	self->dbuf = u = malloc (sizeof (*u));
732	req->flags |= EIO_FLAG_PTR2_FREE;	1018	req->flags |= EIO_FLAG_PTR1_FREE | EIO_FLAG_PTR2_FREE;
733	req->ptr2 = names = malloc (memlen);	1019	req->ptr1 = names = malloc (namesalloc);
		1020	req->ptr2 = dents = flags ? malloc (dentalloc * sizeof (eio_dirent)) : 0;
		1021
734	X_UNLOCK (wrklock);	1022	X_UNLOCK (wrklock);
735		1023
736	if (dirp && u && names)	1024	if (dirp && names && (!flags || dents))
737	for (;;)	1025	for (;;)
738	{	1026	{
739	errno = 0;	1027	errno = 0;
740	readdir_r (dirp, &u->d, &entp);	1028	entp = readdir (dirp);
741		1029
742	if (!entp)	1030	if (!entp)
		1031	{
		1032	if (errno)
		1033	break;
		1034
		1035	/* sort etc. */
		1036	req->int1 = flags;
		1037	req->result = dentoffs;
		1038
		1039	if (flags & EIO_READDIR_STAT_ORDER || !(~flags & (EIO_READDIR_DIRS_FIRST | EIO_READDIR_FOUND_UNKNOWN))
		1040	{
		1041	/* pray your qsort doesn't use quicksort */
		1042	qsort (dents, dentoffs, sizeof (*dents), eio_dent_cmp); /* score depends of DIRS_FIRST */
		1043	}
		1044	else if (flags & EIO_READDIR_DIRS_FIRST && !(flags & EIO_READDIR_FOUND_UNKNOWN))
		1045	{
		1046	/* in this case, all is known, and we just put dirs first and sort them */
		1047	eio_dirent *ent = dents + dentoffs;
		1048	eio_dirent *dir = dents;
		1049
		1050	while (ent > dir)
		1051	{
		1052	if (dir->type == DT_DIR)
		1053	++dir;
		1054	else
		1055	{
		1056	--ent;
		1057
		1058	if (ent->type == DT_DIR)
		1059	{
		1060	eio_dirent tmp = *dir;
		1061	*dir = *ent;
		1062	*ent = tmp;
		1063
		1064	++dir;
		1065	}
		1066	}
		1067	}
		1068
		1069	/* now sort the dirs only */
		1070	qsort (dents, dir - dents, sizeof (*dents), eio_dent_cmp);
		1071	}
		1072
		1073	{int i; for(i=0;i<dentoffs;++i){eio_dirent *e=dents+i; printf ("%9ld %3d %s\n", e->inode,e->score,e->name);}}//D
		1074
743	break;	1075	break;
		1076	}
744		1077
745	name = entp->d_name;	1078	name = entp->d_name;
746		1079
747	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))	1080	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
748	{	1081	{
749	int len = strlen (name) + 1;	1082	int len = strlen (name) + 1;
750		1083
751	res++;	1084	while (expect_false (namesoffs + len > namesalloc))
752
753	while (memofs + len > memlen)
754	{	1085	{
755	memlen *= 2;	1086	namesalloc *= 2;
756	X_LOCK (wrklock);	1087	X_LOCK (wrklock);
757	req->ptr2 = names = realloc (names, memlen);	1088	req->ptr1 = names = realloc (names, namesalloc);
758	X_UNLOCK (wrklock);	1089	X_UNLOCK (wrklock);
759		1090
760	if (!names)	1091	if (!names)
761	break;	1092	break;
762	}	1093	}
763		1094
764	memcpy (names + memofs, name, len);	1095	memcpy (names + namesoffs, name, len);
		1096
		1097	if (dents)
		1098	{
		1099	struct eio_dirent *ent;
		1100
		1101	if (expect_false (dentoffs == dentalloc))
		1102	{
		1103	dentalloc *= 2;
		1104	X_LOCK (wrklock);
		1105	req->ptr2 = dents = realloc (dents, dentalloc * sizeof (eio_dirent));
		1106	X_UNLOCK (wrklock);
		1107
		1108	if (!dents)
		1109	break;
		1110	}
		1111
		1112	ent = dents + dentoffs;
		1113
		1114	ent->name = names + namesoffs;
		1115	ent->namelen = len - 1;
		1116	ent->inode = D_INO (entp);
		1117
		1118	switch (D_TYPE (entp))
		1119	{
		1120	default:
		1121	ent->type = EIO_DT_UNKNOWN;
		1122	flags |= EIO_READDIR_FOUND_UNKNOWN;
		1123	break;
		1124
		1125	#ifdef DT_FIFO
		1126	case DT_FIFO: ent->type = EIO_DT_FIFO; break;
		1127	#endif
		1128	#ifdef DT_CHR
		1129	case DT_CHR: ent->type = EIO_DT_CHR; break;
		1130	#endif
		1131	#ifdef DT_DIR
		1132	case DT_DIR: ent->type = EIO_DT_DIR; break;
		1133	#endif
		1134	#ifdef DT_BLK
		1135	case DT_BLK: ent->type = EIO_DT_BLK; break;
		1136	#endif
		1137	#ifdef DT_REG
		1138	case DT_REG: ent->type = EIO_DT_REG; break;
		1139	#endif
		1140	#ifdef DT_LNK
		1141	case DT_LNK: ent->type = EIO_DT_LNK; break;
		1142	#endif
		1143	#ifdef DT_SOCK
		1144	case DT_SOCK: ent->type = EIO_DT_SOCK; break;
		1145	#endif
		1146	#ifdef DT_WHT
		1147	case DT_WHT: ent->type = EIO_DT_WHT; break;
		1148	#endif
		1149	}
		1150
		1151	ent->score = 0;
		1152
		1153	if (flags & EIO_READDIR_DIRS_FIRST)
		1154	{
		1155	if (ent->type == EIO_DT_UNKNOWN)
		1156	{
		1157	if (*name == '.') /* leading dots are likely directories, and, in any case, rare */
		1158	ent->score = 98;
		1159	else if (!strchr (name, '.')) /* absense of dots indicate likely dirs */
		1160	ent->score = len <= 4 ? 5 : len <= 7 ? 4 : 1; /* shorter == more likely dir, but avoid too many classes */
		1161	}
		1162	else if (ent->type == DT_DIR)
		1163	ent->score = 100;
		1164	}
		1165	}
		1166
765	memofs += len;	1167	namesoffs += len;
		1168	++dentoffs;
766	}	1169	}
767	}	1170	}
768		1171	else
769	if (errno)
770	res = -1;
771
772	req->result = res;	1172	req->result = -1;
		1173
		1174	/* if user doesn't want the dents, do not provide it */
		1175	if (!(flags & EIO_READDIR_DENTS))
		1176	{
		1177	X_LOCK (wrklock);
		1178	free (dents);
		1179	req->ptr2 = req->ptr1;
		1180	req->ptr1 = 0;
		1181	X_UNLOCK (wrklock);
		1182	}
		1183	}
		1184
		1185	#if !(_POSIX_MAPPED_FILES && _POSIX_SYNCHRONIZED_IO)
		1186	# undef msync
		1187	# define msync(a,b,c) ((errno = ENOSYS), -1)
		1188	#endif
		1189
		1190	int
		1191	eio__mtouch (void *mem, size_t len, int flags)
		1192	{
		1193	intptr_t addr = (intptr_t)mem;
		1194	intptr_t end = addr + len;
		1195	#ifdef PAGESIZE
		1196	const intptr_t page = PAGESIZE;
		1197	#else
		1198	static intptr_t page;
		1199
		1200	if (!page)
		1201	page = sysconf (_SC_PAGESIZE);
		1202	#endif
		1203
		1204	addr &= ~(page - 1); /* assume page size is always a power of two */
		1205
		1206	if (addr < end)
		1207	if (flags) /* modify */
		1208	do { *((volatile sig_atomic_t *)addr) |= 0; } while ((addr += page) < len);
		1209	else
		1210	do { *((volatile sig_atomic_t *)addr) ; } while ((addr += page) < len);
		1211
		1212	return 0;
773	}	1213	}
774		1214
775	/*****************************************************************************/	1215	/*****************************************************************************/
776		1216
777	#define ALLOC(len) \	1217	#define ALLOC(len) \
…		…
787	req->result = -1; \	1227	req->result = -1; \
788	break; \	1228	break; \
789	} \	1229	} \
790	}	1230	}
791		1231
792	X_THREAD_PROC (eio_proc)	1232	X_THREAD_PROC (etp_proc)
793	{	1233	{
794	eio_req *req;	1234	ETP_REQ *req;
795	struct timespec ts;	1235	struct timespec ts;
796	worker *self = (worker *)thr_arg;	1236	etp_worker *self = (etp_worker *)thr_arg;
797		1237
798	/* try to distribute timeouts somewhat randomly */	1238	/* try to distribute timeouts somewhat randomly */
799	ts.tv_nsec = ((unsigned long)self & 1023UL) * (1000000000UL / 1024UL);	1239	ts.tv_nsec = ((unsigned long)self & 1023UL) * (1000000000UL / 1024UL);
800		1240
801	for (;;)	1241	for (;;)
802	{	1242	{
803	ts.tv_sec = time (0) + IDLE_TIMEOUT;
804
805	X_LOCK (reqlock);	1243	X_LOCK (reqlock);
806		1244
807	for (;;)	1245	for (;;)
808	{	1246	{
809	self->req = req = reqq_shift (&req_queue);	1247	self->req = req = reqq_shift (&req_queue);
…		…
811	if (req)	1249	if (req)
812	break;	1250	break;
813		1251
814	++idle;	1252	++idle;
815		1253
		1254	ts.tv_sec = time (0) + IDLE_TIMEOUT;
816	if (X_COND_TIMEDWAIT (reqwait, reqlock, ts) == ETIMEDOUT)	1255	if (X_COND_TIMEDWAIT (reqwait, reqlock, ts) == ETIMEDOUT)
817	{	1256	{
818	if (idle > max_idle)	1257	if (idle > max_idle)
819	{	1258	{
820	--idle;	1259	--idle;
…		…
825	goto quit;	1264	goto quit;
826	}	1265	}
827		1266
828	/* we are allowed to idle, so do so without any timeout */	1267	/* we are allowed to idle, so do so without any timeout */
829	X_COND_WAIT (reqwait, reqlock);	1268	X_COND_WAIT (reqwait, reqlock);
830	ts.tv_sec = time (0) + IDLE_TIMEOUT;
831	}	1269	}
832		1270
833	--idle;	1271	--idle;
834	}	1272	}
835		1273
836	--nready;	1274	--nready;
837		1275
838	X_UNLOCK (reqlock);	1276	X_UNLOCK (reqlock);
839		1277
840	errno = 0; /* strictly unnecessary */	1278	if (req->type < 0)
		1279	goto quit;
841		1280
842	if (!EIO_CANCELLED (req))	1281	if (!EIO_CANCELLED (req))
843	switch (req->type)	1282	ETP_EXECUTE (self, req);
844	{
845	case EIO_READ: ALLOC (req->size);
846	req->result = req->offs >= 0
847	? pread (req->int1, req->ptr2, req->size, req->offs)
848	: read (req->int1, req->ptr2, req->size); break;
849	case EIO_WRITE: req->result = req->offs >= 0
850	? pwrite (req->int1, req->ptr2, req->size, req->offs)
851	: write (req->int1, req->ptr2, req->size); break;
852
853	case EIO_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
854	case EIO_SENDFILE: req->result = eio__sendfile (req->int1, req->int2, req->offs, req->size, self); break;
855
856	case EIO_STAT: ALLOC (sizeof (EIO_STRUCT_STAT));
857	req->result = stat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
858	case EIO_LSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
859	req->result = lstat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
860	case EIO_FSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
861	req->result = fstat (req->int1, (EIO_STRUCT_STAT *)req->ptr2); break;
862
863	case EIO_CHOWN: req->result = chown (req->ptr1, req->int2, req->int3); break;
864	case EIO_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break;
865	case EIO_CHMOD: req->result = chmod (req->ptr1, (mode_t)req->int2); break;
866	case EIO_FCHMOD: req->result = fchmod (req->int1, (mode_t)req->int2); break;
867	case EIO_TRUNCATE: req->result = truncate (req->ptr1, req->offs); break;
868	case EIO_FTRUNCATE: req->result = ftruncate (req->int1, req->offs); break;
869
870	case EIO_OPEN: req->result = open (req->ptr1, req->int1, (mode_t)req->int2); break;
871	case EIO_CLOSE: req->result = close (req->int1); break;
872	case EIO_DUP2: req->result = dup2 (req->int1, req->int2); break;
873	case EIO_UNLINK: req->result = unlink (req->ptr1); break;
874	case EIO_RMDIR: req->result = rmdir (req->ptr1); break;
875	case EIO_MKDIR: req->result = mkdir (req->ptr1, (mode_t)req->int2); break;
876	case EIO_RENAME: req->result = rename (req->ptr1, req->ptr2); break;
877	case EIO_LINK: req->result = link (req->ptr1, req->ptr2); break;
878	case EIO_SYMLINK: req->result = symlink (req->ptr1, req->ptr2); break;
879	case EIO_MKNOD: req->result = mknod (req->ptr1, (mode_t)req->int2, (dev_t)req->offs); break;
880
881	case EIO_READLINK: ALLOC (NAME_MAX);
882	req->result = readlink (req->ptr1, req->ptr2, NAME_MAX); break;
883
884	case EIO_SYNC: req->result = 0; sync (); break;
885	case EIO_FSYNC: req->result = fsync (req->int1); break;
886	case EIO_FDATASYNC: req->result = fdatasync (req->int1); break;
887
888	case EIO_READDIR: eio__scandir (req, self); break;
889
890	case EIO_BUSY:
891	#ifdef _WIN32
892	Sleep (req->nv1 * 1000.);
893	#else
894	{
895	struct timeval tv;
896
897	tv.tv_sec = req->nv1;
898	tv.tv_usec = (req->nv1 - tv.tv_sec) * 1000000.;
899
900	req->result = select (0, 0, 0, 0, &tv);
901	}
902	#endif
903	break;
904
905	case EIO_UTIME:
906	case EIO_FUTIME:
907	{
908	struct timeval tv[2];
909	struct timeval *times;
910
911	if (req->nv1 != -1. || req->nv2 != -1.)
912	{
913	tv[0].tv_sec = req->nv1;
914	tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1000000.;
915	tv[1].tv_sec = req->nv2;
916	tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1000000.;
917
918	times = tv;
919	}
920	else
921	times = 0;
922
923
924	req->result = req->type == EIO_FUTIME
925	? futimes (req->int1, times)
926	: utimes (req->ptr1, times);
927	}
928
929	case EIO_GROUP:
930	case EIO_NOP:
931	req->result = 0;
932	break;
933
934	case EIO_QUIT:
935	goto quit;
936
937	default:
938	req->result = -1;
939	break;
940	}
941
942	req->errorno = errno;
943		1283
944	X_LOCK (reslock);	1284	X_LOCK (reslock);
945		1285
946	++npending;	1286	++npending;
947		1287
948	if (!reqq_push (&res_queue, req) && want_poll_cb)	1288	if (!reqq_push (&res_queue, req) && want_poll_cb)
949	want_poll_cb ();	1289	want_poll_cb ();
950		1290
951	self->req = 0;	1291	self->req = 0;
952	worker_clear (self);	1292	etp_worker_clear (self);
953		1293
954	X_UNLOCK (reslock);	1294	X_UNLOCK (reslock);
955	}	1295	}
956		1296
957	quit:	1297	quit:
958	X_LOCK (wrklock);	1298	X_LOCK (wrklock);
959	worker_free (self);	1299	etp_worker_free (self);
960	X_UNLOCK (wrklock);	1300	X_UNLOCK (wrklock);
961		1301
962	return 0;	1302	return 0;
963	}	1303	}
964		1304
965	/*****************************************************************************/	1305	/*****************************************************************************/
966		1306
967	static void eio_atfork_prepare (void)
968	{
969	X_LOCK (wrklock);
970	X_LOCK (reqlock);
971	X_LOCK (reslock);
972	#if !HAVE_PREADWRITE
973	X_LOCK (preadwritelock);
974	#endif
975	#if !HAVE_READDIR_R
976	X_LOCK (readdirlock);
977	#endif
978	}
979
980	static void eio_atfork_parent (void)
981	{
982	#if !HAVE_READDIR_R
983	X_UNLOCK (readdirlock);
984	#endif
985	#if !HAVE_PREADWRITE
986	X_UNLOCK (preadwritelock);
987	#endif
988	X_UNLOCK (reslock);
989	X_UNLOCK (reqlock);
990	X_UNLOCK (wrklock);
991	}
992
993	static void eio_atfork_child (void)
994	{
995	eio_req *prv;
996
997	while (prv = reqq_shift (&req_queue))
998	eio_destroy (prv);
999
1000	while (prv = reqq_shift (&res_queue))
1001	eio_destroy (prv);
1002
1003	while (wrk_first.next != &wrk_first)
1004	{
1005	worker *wrk = wrk_first.next;
1006
1007	if (wrk->req)
1008	eio_destroy (wrk->req);
1009
1010	worker_clear (wrk);
1011	worker_free (wrk);
1012	}
1013
1014	started = 0;
1015	idle = 0;
1016	nreqs = 0;
1017	nready = 0;
1018	npending = 0;
1019
1020	eio_atfork_parent ();
1021	}
1022
1023	int eio_init (void (*want_poll)(void), void (*done_poll)(void))	1307	int eio_init (void (*want_poll)(void), void (*done_poll)(void))
1024	{	1308	{
1025	want_poll_cb = want_poll;	1309	return etp_init (want_poll, done_poll);
1026	done_poll_cb = done_poll;
1027
1028	#ifdef _WIN32
1029	X_MUTEX_CHECK (wrklock);
1030	X_MUTEX_CHECK (reslock);
1031	X_MUTEX_CHECK (reqlock);
1032	X_MUTEX_CHECK (reqwait);
1033	X_MUTEX_CHECK (preadwritelock);
1034	X_MUTEX_CHECK (readdirlock);
1035
1036	X_COND_CHECK (reqwait);
1037	#endif
1038
1039	X_THREAD_ATFORK (eio_atfork_prepare, eio_atfork_parent, eio_atfork_child);
1040	}	1310	}
1041		1311
1042	static void eio_api_destroy (eio_req *req)	1312	static void eio_api_destroy (eio_req *req)
1043	{	1313	{
1044	free (req);	1314	free (req);
…		…
1049	\	1319	\
1050	req = (eio_req *)calloc (1, sizeof *req); \	1320	req = (eio_req *)calloc (1, sizeof *req); \
1051	if (!req) \	1321	if (!req) \
1052	return 0; \	1322	return 0; \
1053	\	1323	\
1054	req->type = rtype; \	1324	req->type = rtype; \
1055	req->pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS; \	1325	req->pri = pri; \
1056	req->finish = cb; \	1326	req->finish = cb; \
		1327	req->data = data; \
1057	req->destroy = eio_api_destroy;	1328	req->destroy = eio_api_destroy;
1058		1329
1059	#define SEND eio_submit (req); return req	1330	#define SEND eio_submit (req); return req
1060		1331
1061	#define PATH \	1332	#define PATH \
…		…
1065	{ \	1336	{ \
1066	eio_api_destroy (req); \	1337	eio_api_destroy (req); \
1067	return 0; \	1338	return 0; \
1068	}	1339	}
1069		1340
		1341	static void eio_execute (etp_worker *self, eio_req *req)
		1342	{
		1343	errno = 0;
		1344
		1345	switch (req->type)
		1346	{
		1347	case EIO_READ: ALLOC (req->size);
		1348	req->result = req->offs >= 0
		1349	? pread (req->int1, req->ptr2, req->size, req->offs)
		1350	: read (req->int1, req->ptr2, req->size); break;
		1351	case EIO_WRITE: req->result = req->offs >= 0
		1352	? pwrite (req->int1, req->ptr2, req->size, req->offs)
		1353	: write (req->int1, req->ptr2, req->size); break;
		1354
		1355	case EIO_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1356	case EIO_SENDFILE: req->result = eio__sendfile (req->int1, req->int2, req->offs, req->size, self); break;
		1357
		1358	case EIO_STAT: ALLOC (sizeof (EIO_STRUCT_STAT));
		1359	req->result = stat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
		1360	case EIO_LSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
		1361	req->result = lstat (req->ptr1, (EIO_STRUCT_STAT *)req->ptr2); break;
		1362	case EIO_FSTAT: ALLOC (sizeof (EIO_STRUCT_STAT));
		1363	req->result = fstat (req->int1, (EIO_STRUCT_STAT *)req->ptr2); break;
		1364
		1365	case EIO_CHOWN: req->result = chown (req->ptr1, req->int2, req->int3); break;
		1366	case EIO_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break;
		1367	case EIO_CHMOD: req->result = chmod (req->ptr1, (mode_t)req->int2); break;
		1368	case EIO_FCHMOD: req->result = fchmod (req->int1, (mode_t)req->int2); break;
		1369	case EIO_TRUNCATE: req->result = truncate (req->ptr1, req->offs); break;
		1370	case EIO_FTRUNCATE: req->result = ftruncate (req->int1, req->offs); break;
		1371
		1372	case EIO_OPEN: req->result = open (req->ptr1, req->int1, (mode_t)req->int2); break;
		1373	case EIO_CLOSE: req->result = close (req->int1); break;
		1374	case EIO_DUP2: req->result = dup2 (req->int1, req->int2); break;
		1375	case EIO_UNLINK: req->result = unlink (req->ptr1); break;
		1376	case EIO_RMDIR: req->result = rmdir (req->ptr1); break;
		1377	case EIO_MKDIR: req->result = mkdir (req->ptr1, (mode_t)req->int2); break;
		1378	case EIO_RENAME: req->result = rename (req->ptr1, req->ptr2); break;
		1379	case EIO_LINK: req->result = link (req->ptr1, req->ptr2); break;
		1380	case EIO_SYMLINK: req->result = symlink (req->ptr1, req->ptr2); break;
		1381	case EIO_MKNOD: req->result = mknod (req->ptr1, (mode_t)req->int2, (dev_t)req->int3); break;
		1382
		1383	case EIO_READLINK: ALLOC (NAME_MAX);
		1384	req->result = readlink (req->ptr1, req->ptr2, NAME_MAX); break;
		1385
		1386	case EIO_SYNC: req->result = 0; sync (); break;
		1387	case EIO_FSYNC: req->result = fsync (req->int1); break;
		1388	case EIO_FDATASYNC: req->result = fdatasync (req->int1); break;
		1389	case EIO_MSYNC: req->result = msync (req->ptr2, req->size, req->int1); break;
		1390	case EIO_MTOUCH: req->result = eio__mtouch (req->ptr2, req->size, req->int1); break;
		1391	case EIO_SYNC_FILE_RANGE: req->result = eio__sync_file_range (req->int1, req->offs, req->size, req->int2); break;
		1392
		1393	case EIO_READDIR: eio__scandir (req, self); break;
		1394
		1395	case EIO_BUSY:
		1396	#ifdef _WIN32
		1397	Sleep (req->nv1 * 1000.);
		1398	#else
		1399	{
		1400	struct timeval tv;
		1401
		1402	tv.tv_sec = req->nv1;
		1403	tv.tv_usec = (req->nv1 - tv.tv_sec) * 1000000.;
		1404
		1405	req->result = select (0, 0, 0, 0, &tv);
		1406	}
		1407	#endif
		1408	break;
		1409
		1410	case EIO_UTIME:
		1411	case EIO_FUTIME:
		1412	{
		1413	struct timeval tv[2];
		1414	struct timeval *times;
		1415
		1416	if (req->nv1 != -1. || req->nv2 != -1.)
		1417	{
		1418	tv[0].tv_sec = req->nv1;
		1419	tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1000000.;
		1420	tv[1].tv_sec = req->nv2;
		1421	tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1000000.;
		1422
		1423	times = tv;
		1424	}
		1425	else
		1426	times = 0;
		1427
		1428
		1429	req->result = req->type == EIO_FUTIME
		1430	? futimes (req->int1, times)
		1431	: utimes (req->ptr1, times);
		1432	}
		1433	break;
		1434
		1435	case EIO_GROUP:
		1436	abort (); /* handled in eio_request */
		1437
		1438	case EIO_NOP:
		1439	req->result = 0;
		1440	break;
		1441
		1442	case EIO_CUSTOM:
		1443	((void (*)(eio_req *))req->feed) (req);
		1444	break;
		1445
		1446	default:
		1447	req->result = -1;
		1448	break;
		1449	}
		1450
		1451	req->errorno = errno;
		1452	}
		1453
		1454	#ifndef EIO_NO_WRAPPERS
		1455
1070	eio_req *eio_nop (int pri, eio_cb cb, void *data)	1456	eio_req *eio_nop (int pri, eio_cb cb, void *data)
1071	{	1457	{
1072	REQ (EIO_NOP); SEND;	1458	REQ (EIO_NOP); SEND;
1073	}	1459	}
1074		1460
…		…
1083	}	1469	}
1084		1470
1085	eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data)	1471	eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data)
1086	{	1472	{
1087	REQ (EIO_FSYNC); req->int1 = fd; SEND;	1473	REQ (EIO_FSYNC); req->int1 = fd; SEND;
		1474	}
		1475
		1476	eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data)
		1477	{
		1478	REQ (EIO_MSYNC); req->ptr2 = addr; req->size = length; req->int1 = flags; SEND;
		1479	}
		1480
		1481	eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data)
		1482	{
		1483	REQ (EIO_MTOUCH); req->ptr2 = addr; req->size = length; req->int1 = flags; SEND;
		1484	}
		1485
		1486	eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data)
		1487	{
		1488	REQ (EIO_SYNC_FILE_RANGE); req->int1 = fd; req->offs = offset; req->size = nbytes; req->int2 = flags; SEND;
1088	}	1489	}
1089		1490
1090	eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data)	1491	eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data)
1091	{	1492	{
1092	REQ (EIO_FDATASYNC); req->int1 = fd; SEND;	1493	REQ (EIO_FDATASYNC); req->int1 = fd; SEND;
…		…
1206	eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data)	1607	eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data)
1207	{	1608	{
1208	return eio__1path (EIO_RMDIR, path, pri, cb, data);	1609	return eio__1path (EIO_RMDIR, path, pri, cb, data);
1209	}	1610	}
1210		1611
1211	eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data)	1612	eio_req *eio_readdir (const char *path, int flags, int pri, eio_cb cb, void *data)
1212	{	1613	{
1213	return eio__1path (EIO_READDIR, path, pri, cb, data);	1614	REQ (EIO_READDIR); PATH; req->int1 = flags; SEND;
1214	}	1615	}
1215		1616
1216	eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data)	1617	eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data)
1217	{	1618	{
1218	REQ (EIO_MKNOD); PATH; req->int2 = (long)mode; req->int2 = (long)dev; SEND;	1619	REQ (EIO_MKNOD); PATH; req->int2 = (long)mode; req->int3 = (long)dev; SEND;
1219	}	1620	}
1220		1621
1221	static eio_req *	1622	static eio_req *
1222	eio__2path (int type, const char *path, const char *new_path, int pri, eio_cb cb, void *data)	1623	eio__2path (int type, const char *path, const char *new_path, int pri, eio_cb cb, void *data)
1223	{	1624	{
…		…
1247	eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data)	1648	eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data)
1248	{	1649	{
1249	return eio__2path (EIO_RENAME, path, new_path, pri, cb, data);	1650	return eio__2path (EIO_RENAME, path, new_path, pri, cb, data);
1250	}	1651	}
1251		1652
		1653	eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data)
		1654	{
		1655	REQ (EIO_CUSTOM); req->feed = (void (*)(eio_req *))execute; SEND;
		1656	}
		1657
		1658	#endif
		1659
1252	eio_req *eio_grp (eio_cb cb, void *data)	1660	eio_req *eio_grp (eio_cb cb, void *data)
1253	{	1661	{
1254	const int pri = EIO_PRI_MAX;	1662	const int pri = EIO_PRI_MAX;
1255		1663
1256	REQ (EIO_GROUP); SEND;	1664	REQ (EIO_GROUP); SEND;
…		…
1280		1688
1281	void eio_grp_add (eio_req *grp, eio_req *req)	1689	void eio_grp_add (eio_req *grp, eio_req *req)
1282	{	1690	{
1283	assert (("cannot add requests to IO::AIO::GRP after the group finished", grp->int1 != 2));	1691	assert (("cannot add requests to IO::AIO::GRP after the group finished", grp->int1 != 2));
1284		1692
		1693	grp->flags |= EIO_FLAG_GROUPADD;
		1694
1285	++grp->size;	1695	++grp->size;
1286	req->grp = grp;	1696	req->grp = grp;
1287		1697
1288	req->grp_prev = 0;	1698	req->grp_prev = 0;
1289	req->grp_next = grp->grp_first;	1699	req->grp_next = grp->grp_first;
…		…
1297	/*****************************************************************************/	1707	/*****************************************************************************/
1298	/* misc garbage */	1708	/* misc garbage */
1299		1709
1300	ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count)	1710	ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count)
1301	{	1711	{
1302	worker wrk;	1712	etp_worker wrk;
1303		1713
1304	wrk.dbuf = 0;	1714	wrk.dbuf = 0;
1305		1715
1306	eio__sendfile (ofd, ifd, offset, count, &wrk);	1716	eio__sendfile (ofd, ifd, offset, count, &wrk);
1307		1717

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