[ViewVC] Diff of: cvs/libev/ev

Comparing libev/ev_select.c (file contents):
Revision 1.9 by root, Sat Nov 3 09:19:58 2007 UTC vs.
Revision 1.28 by root, Sun Mar 16 16:38:23 2008 UTC

…		…
2	* libev select fd activity backend	2	* libev select fd activity backend
3	*	3	*
4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>	4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5	* All rights reserved.	5	* All rights reserved.
6	*	6	*
7	* Redistribution and use in source and binary forms, with or without	7	* Redistribution and use in source and binary forms, with or without modifica-
8	* modification, are permitted provided that the following conditions are	8	* tion, are permitted provided that the following conditions are met:
9	* 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.
10	*	27	*
11	* * Redistributions of source code must retain the above copyright	28	* Alternatively, the contents of this file may be used under the terms of
12	* notice, this list of conditions and the following disclaimer.	29	* the GNU General Public License ("GPL") version 2 or any later version,
13	*	30	* in which case the provisions of the GPL are applicable instead of
14	* * Redistributions in binary form must reproduce the above	31	* the above. If you wish to allow the use of your version of this file
15	* copyright notice, this list of conditions and the following	32	* only under the terms of the GPL and not to allow others to use your
16	* disclaimer in the documentation and/or other materials provided	33	* version of this file under the BSD license, indicate your decision
17	* with the distribution.	34	* by deleting the provisions above and replace them with the notice
18	*	35	* and other provisions required by the GPL. If you do not delete the
19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS	36	* provisions above, a recipient may use your version of this file under
20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT	37	* either the BSD or the GPL.
21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30	*/	38	*/
31		39
32	/* for broken bsd's */	40	#ifndef _WIN32
33	#include <sys/time.h>
34	#include <sys/types.h>
35	#include <unistd.h>
36
37	/* for unix systems */	41	/* for unix systems */
38	#ifndef WIN32
39	# include <sys/select.h>	42	# include <sys/select.h>
		43	# include <inttypes.h>
		44	#endif
		45
		46	#ifndef EV_SELECT_USE_FD_SET
		47	# ifdef NFDBITS
		48	# define EV_SELECT_USE_FD_SET 0
		49	# else
		50	# define EV_SELECT_USE_FD_SET 1
		51	# endif
		52	#endif
		53
		54	#if EV_SELECT_IS_WINSOCKET
		55	# undef EV_SELECT_USE_FD_SET
		56	# define EV_SELECT_USE_FD_SET 1
		57	# undef EINTR
		58	# define EINTR WSAEINTR
		59	# undef EBADF
		60	# define EBADF WSAENOTSOCK
		61	# undef ENOMEM
		62	# define ENOMEM (errno + 1)
		63	#endif
		64
		65	#if !EV_SELECT_USE_FD_SET
		66	# define NFDBYTES (NFDBITS / 8)
40	#endif	67	#endif
41		68
42	#include <string.h>	69	#include <string.h>
43	#include <inttypes.h>
44
45	static unsigned char vec_ri, vec_ro, vec_wi, vec_wo;
46	static int vec_max;
47		70
48	static void	71	static void
49	select_modify (int fd, int oev, int nev)	72	select_modify (EV_P_ int fd, int oev, int nev)
50	{	73	{
51	int offs = fd >> 3;	74	if (oev == nev)
52	int mask = 1 << (fd & 7);	75	return;
53		76
54	if (vec_max < (fd >> 5) + 1)	77	{
		78	#if EV_SELECT_USE_FD_SET
		79
		80	#if EV_SELECT_IS_WINSOCKET
		81	SOCKET handle = anfds [fd].handle;
		82	#else
		83	int handle = fd;
		84	#endif
		85
		86	if (nev & EV_READ)
		87	FD_SET (handle, (fd_set *)vec_ri);
		88	else
		89	FD_CLR (handle, (fd_set *)vec_ri);
		90
		91	if (nev & EV_WRITE)
		92	FD_SET (handle, (fd_set *)vec_wi);
		93	else
		94	FD_CLR (handle, (fd_set *)vec_wi);
		95
		96	#else
		97
		98	int word = fd / NFDBITS;
		99	fd_mask mask = 1UL << (fd % NFDBITS);
		100
		101	if (expect_false (vec_max < word + 1))
55	{	102	{
56	int new_max = (fd >> 5) + 1;	103	int new_max = word + 1;
57		104
58	vec_ri = (unsigned char )realloc (vec_ri, new_max 4);	105	vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
59	vec_ro = (unsigned char )realloc (vec_ro, new_max 4); /* could free/malloc */	106	vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
60	vec_wi = (unsigned char )realloc (vec_wi, new_max 4);	107	vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
61	vec_wo = (unsigned char )realloc (vec_wo, new_max 4); /* could free/malloc */	108	vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
62		109
63	for (; vec_max < new_max; ++vec_max)	110	for (; vec_max < new_max; ++vec_max)
64	((uint32_t *)vec_ri)[vec_max] =	111	((fd_mask *)vec_ri) [vec_max] =
65	((uint32_t *)vec_wi)[vec_max] = 0;	112	((fd_mask *)vec_wi) [vec_max] = 0;
66	}	113	}
67		114
68	vec_ri [offs] \|= mask;	115	((fd_mask *)vec_ri) [word] \|= mask;
69	if (!(nev & EV_READ))	116	if (!(nev & EV_READ))
70	vec_ri [offs] &= ~mask;	117	((fd_mask *)vec_ri) [word] &= ~mask;
71		118
72	vec_wi [offs] \|= mask;	119	((fd_mask *)vec_wi) [word] \|= mask;
73	if (!(nev & EV_WRITE))	120	if (!(nev & EV_WRITE))
74	vec_wi [offs] &= ~mask;	121	((fd_mask *)vec_wi) [word] &= ~mask;
		122	#endif
		123	}
75	}	124	}
76		125
77	static void	126	static void
78	select_poll (ev_tstamp timeout)	127	select_poll (EV_P_ ev_tstamp timeout)
79	{	128	{
80	struct timeval tv;	129	struct timeval tv;
81	int res;	130	int res;
82		131
		132	#if EV_SELECT_USE_FD_SET
		133	memcpy (vec_ro, vec_ri, sizeof (fd_set));
		134	memcpy (vec_wo, vec_wi, sizeof (fd_set));
		135	#else
83	memcpy (vec_ro, vec_ri, vec_max * 4);	136	memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
84	memcpy (vec_wo, vec_wi, vec_max * 4);	137	memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
		138	#endif
85		139
86	tv.tv_sec = (long)timeout;	140	tv.tv_sec = (long)timeout;
87	tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);	141	tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
88		142
89	res = select (vec_max * 32, (fd_set )vec_ro, (fd_set )vec_wo, 0, &tv);	143	res = select (vec_max * NFDBITS, (fd_set )vec_ro, (fd_set )vec_wo, 0, &tv);
90		144
91	if (res > 0)	145	if (expect_false (res < 0))
92	{	146	{
93	int word, offs;	147	#if EV_SELECT_IS_WINSOCKET
		148	errno = WSAGetLastError ();
		149	#endif
94		150
95	for (word = vec_max; word--; )	151	if (errno == EBADF)
		152	fd_ebadf (EV_A);
		153	else if (errno == ENOMEM && !syserr_cb)
		154	fd_enomem (EV_A);
		155	else if (errno != EINTR)
		156	syserr ("(libev) select");
		157
		158	return;
		159	}
		160
		161	#if EV_SELECT_USE_FD_SET
		162
		163	{
		164	int fd;
		165
		166	for (fd = 0; fd < anfdmax; ++fd)
		167	if (anfds [fd].events)
96	{	168	{
97	if (((uint32_t )vec_ro) [word] \| ((uint32_t )vec_wo) [word])
98	for (offs = 4; offs--; )
99	{
100	int idx = word * 4 + offs;
101	unsigned char byte_r = vec_ro [idx];
102	unsigned char byte_w = vec_wo [idx];
103	int bit;
104
105	if (byte_r \| byte_w)
106	for (bit = 8; bit--; )
107	{
108	int events = 0;	169	int events = 0;
109	events \|= byte_r & (1 << bit) ? EV_READ : 0;	170	#if EV_SELECT_IS_WINSOCKET
110	events \|= byte_w & (1 << bit) ? EV_WRITE : 0;	171	SOCKET handle = anfds [fd].handle;
		172	#else
		173	int handle = fd;
		174	#endif
111		175
112	if (events)	176	if (FD_ISSET (handle, (fd_set *)vec_ro)) events \|= EV_READ;
113	fd_event (idx * 8 + bit, events);	177	if (FD_ISSET (handle, (fd_set *)vec_wo)) events \|= EV_WRITE;
114	}	178
115	}	179	if (expect_true (events))
		180	fd_event (EV_A_ fd, events);
116	}	181	}
117	}	182	}
118	else if (res < 0)	183
		184	#else
		185
		186	{
		187	int word, bit;
		188	for (word = vec_max; word--; )
119	{	189	{
120	if (errno == EBADF)	190	fd_mask word_r = ((fd_mask *)vec_ro) [word];
121	fd_ebadf ();	191	fd_mask word_w = ((fd_mask *)vec_wo) [word];
122	else if (errno == ENOMEM)	192
123	fd_enomem ();	193	if (word_r \|\| word_w)
		194	for (bit = NFDBITS; bit--; )
		195	{
		196	fd_mask mask = 1UL << bit;
		197	int events = 0;
		198
		199	events \|= word_r & mask ? EV_READ : 0;
		200	events \|= word_w & mask ? EV_WRITE : 0;
		201
		202	if (expect_true (events))
		203	fd_event (EV_A_ word * NFDBITS + bit, events);
		204	}
124	}	205	}
125	}	206	}
126		207
127	static void	208	#endif
		209	}
		210
		211	int inline_size
128	select_init (int flags)	212	select_init (EV_P_ int flags)
129	{	213	{
130	ev_method = EVMETHOD_SELECT;	214	backend_fudge = 0.; /* posix says this is zero */
131	method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
132	method_modify = select_modify;	215	backend_modify = select_modify;
133	method_poll = select_poll;	216	backend_poll = select_poll;
134	}
135		217
		218	#if EV_SELECT_USE_FD_SET
		219	vec_max = FD_SETSIZE / 32;
		220	vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
		221	vec_ro = ev_malloc (sizeof (fd_set));
		222	vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
		223	vec_wo = ev_malloc (sizeof (fd_set));
		224	#else
		225	vec_max = 0;
		226	vec_ri = 0;
		227	vec_ri = 0;
		228	vec_wo = 0;
		229	vec_wo = 0;
		230	#endif
		231
		232	return EVBACKEND_SELECT;
		233	}
		234
		235	void inline_size
		236	select_destroy (EV_P)
		237	{
		238	ev_free (vec_ri);
		239	ev_free (vec_ro);
		240	ev_free (vec_wi);
		241	ev_free (vec_wo);
		242	}
		243
		244

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing libev/ev_select.c (file contents): Revision 1.9 by root, Sat Nov 3 09:19:58 2007 UTC vs. Revision 1.28 by root, Sun Mar 16 16:38:23 2008 UTC

Diff Legend

Comparing libev/ev_select.c (file contents):
Revision 1.9 by root, Sat Nov 3 09:19:58 2007 UTC vs.
Revision 1.28 by root, Sun Mar 16 16:38:23 2008 UTC