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Comparing libev/ev_select.c (file contents):
Revision 1.3 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.17 by root, Tue Nov 6 16:09:37 2007 UTC

1/* for broken bsd's */ 1/*
2#include <sys/time.h> 2 * libev select fd activity backend
3#include <sys/types.h> 3 *
4#include <unistd.h> 4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 */
5 31
6/* for unix systems */ 32/* for unix systems */
33#ifdef WIN32
34typedef unsigned int uint32_t;
35# define EV_SELECT_USE_FD_SET 1
36#else
7#include <sys/select.h> 37# include <sys/select.h>
38# include <inttypes.h>
39#endif
8 40
9#include <string.h> 41#include <string.h>
10#include <inttypes.h>
11
12static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
13static int vec_max;
14 42
15static void 43static void
16select_modify (int fd, int oev, int nev) 44select_modify (EV_P_ int fd, int oev, int nev)
17{ 45{
18 int offs = fd >> 3; 46 if (oev == nev)
19 int mask = 1 << (fd & 7); 47 return;
20 48
21 if (vec_max < (fd >> 5) + 1) 49#if EV_SELECT_USE_FD_SET
22 { 50 if (nev & EV_READ)
23 vec_max = (fd >> 5) + 1; 51 FD_SET (fd, (struct fd_set *)vec_ri);
52 else
53 FD_CLR (fd, (struct fd_set *)vec_ri);
24 54
25 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 55 if (nev & EV_WRITE)
26 vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ 56 FD_SET (fd, (struct fd_set *)vec_wi);
27 vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); 57 else
28 vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ 58 FD_CLR (fd, (struct fd_set *)vec_wi);
29 } 59#else
60 {
61 int offs = fd >> 3;
62 int mask = 1 << (fd & 7);
30 63
31 vec_ri [offs] |= mask; 64 if (vec_max < (fd >> 5) + 1)
32 if (!(nev & EV_READ)) 65 {
33 vec_ri [offs] &= ~mask; 66 int new_max = (fd >> 5) + 1;
34 67
68 vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
69 vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */
70 vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
71 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
72
73 for (; vec_max < new_max; ++vec_max)
74 ((uint32_t *)vec_ri)[vec_max] =
75 ((uint32_t *)vec_wi)[vec_max] = 0;
76 }
77
78 vec_ri [offs] |= mask;
79 if (!(nev & EV_READ))
80 vec_ri [offs] &= ~mask;
81
35 vec_wi [offs] |= mask; 82 vec_wi [offs] |= mask;
36 if (!(nev & EV_WRITE)) 83 if (!(nev & EV_WRITE))
37 vec_wi [offs] &= ~mask; 84 vec_wi [offs] &= ~mask;
85 }
86#endif
38} 87}
39 88
89static void
40static void select_poll (ev_tstamp timeout) 90select_poll (EV_P_ ev_tstamp timeout)
41{ 91{
92 int word, offs;
42 struct timeval tv; 93 struct timeval tv;
43 int res; 94 int res;
44 95
96#if EV_SELECT_USE_FD_SET
97 memcpy (vec_ro, vec_ri, sizeof (struct fd_set));
98 memcpy (vec_wo, vec_wi, sizeof (struct fd_set));
99#else
45 memcpy (vec_ro, vec_ri, vec_max * 4); 100 memcpy (vec_ro, vec_ri, vec_max * 4);
46 memcpy (vec_wo, vec_wi, vec_max * 4); 101 memcpy (vec_wo, vec_wi, vec_max * 4);
102#endif
47 103
48 tv.tv_sec = (long)timeout; 104 tv.tv_sec = (long)timeout;
49 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 105 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
50 106
51 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 107 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
52 108
53 if (res > 0) 109 if (res < 0)
54 { 110 {
55 int word, offs; 111#ifdef WIN32
112 if (errno == WSAEINTR ) errno = EINTR;
113 if (errno == WSAENOTSOCK) errno = EBADF;
114#endif
56 115
57 for (word = vec_max; word--; ) 116 if (errno == EBADF)
58 { 117 fd_ebadf (EV_A);
59 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) 118 else if (errno == ENOMEM && !syserr_cb)
60 for (offs = 4; offs--; ) 119 fd_enomem (EV_A);
61 { 120 else if (errno != EINTR)
62 int idx = word * 4 + offs; 121 syserr ("(libev) select");
63 unsigned char byte_r = vec_ro [idx];
64 unsigned char byte_w = vec_wo [idx];
65 int bit;
66 122
67 if (byte_r | byte_w) 123 return;
68 for (bit = 8; bit--; ) 124 }
69 {
70 int events = 0;
71 events |= byte_r & (1 << bit) ? EV_READ : 0;
72 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
73 125
74 if (events) 126#if EV_SELECT_USE_FD_SET
75 fd_event (idx * 8 + bit, events); 127 for (word = 0; word < FD_SETSIZE; ++word)
76 } 128 {
77 } 129 int events = 0;
78 } 130 if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ;
131 if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE;
132
133 if (events)
134 fd_event (EV_A_ word, events);
79 } 135 }
136#else
137 for (word = vec_max; word--; )
138 {
139 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
140 for (offs = 4; offs--; )
141 {
142 int idx = word * 4 + offs;
143 unsigned char byte_r = vec_ro [idx];
144 unsigned char byte_w = vec_wo [idx];
145 int bit;
146
147 if (byte_r | byte_w)
148 for (bit = 8; bit--; )
149 {
150 int events = 0;
151 events |= byte_r & (1 << bit) ? EV_READ : 0;
152 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
153
154 if (events)
155 fd_event (EV_A_ idx * 8 + bit, events);
156 }
157 }
158 }
159#endif
80} 160}
81 161
162static int
82void select_init (int flags) 163select_init (EV_P_ int flags)
83{ 164{
84 ev_method = EVMETHOD_SELECT;
85 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 165 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
86 method_modify = select_modify; 166 method_modify = select_modify;
87 method_poll = select_poll; 167 method_poll = select_poll;
168
169#if EV_SELECT_USE_FD_SET
170 vec_max = FD_SETSIZE / 32;
171 vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri);
172 vec_ro = ev_malloc (sizeof (struct fd_set));
173 vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi);
174 vec_wo = ev_malloc (sizeof (struct fd_set));
175#else
176 vec_max = 0;
177 vec_ri = 0;
178 vec_ri = 0;
179 vec_wo = 0;
180 vec_wo = 0;
181#endif
182
183 return EVMETHOD_SELECT;
184}
185
186static void
187select_destroy (EV_P)
188{
189 ev_free (vec_ri);
190 ev_free (vec_ro);
191 ev_free (vec_wi);
192 ev_free (vec_wo);
88} 193}
89 194
90 195

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