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Comparing libev/ev_select.c (file contents):
Revision 1.2 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.19 by root, Thu Nov 8 16:58:00 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#if WIN32
34typedef unsigned int uint32_t;
35# ifndef EV_SELECT_USE_FD_SET
36# define EV_SELECT_USE_FD_SET 1
37# endif
38#else
7#include <sys/select.h> 39# include <sys/select.h>
40# include <inttypes.h>
41#endif
42
43#if EV_SELECT_USE_WIN32_HANDLES
44# undef EV_SELECT_USE_FD_SET
45# define EV_SELECT_USE_FD_SET 1
46#endif
8 47
9#include <string.h> 48#include <string.h>
10#include <inttypes.h>
11
12static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
13static int vec_max;
14 49
15static void 50static void
16select_modify (int fd, int oev, int nev) 51select_modify (EV_P_ int fd, int oev, int nev)
17{ 52{
53 if (oev == nev)
54 return;
55
56#if EV_SELECT_USE_FD_SET
57# if EV_SELECT_USE_WIN32_HANDLES
58 fd = _get_osfhandle (fd);
59 if (fd < 0)
60 return;
61# endif
62
63 if (nev & EV_READ)
64 FD_SET (fd, (struct fd_set *)vec_ri);
65 else
66 FD_CLR (fd, (struct fd_set *)vec_ri);
67
68 if (nev & EV_WRITE)
69 FD_SET (fd, (struct fd_set *)vec_wi);
70 else
71 FD_CLR (fd, (struct fd_set *)vec_wi);
72#else
73 {
18 int offs = fd >> 3; 74 int offs = fd >> 3;
19 int mask = 1 << (fd & 7); 75 int mask = 1 << (fd & 7);
20 76
21 if (vec_max < (fd >> 5) + 1) 77 if (vec_max < (fd >> 5) + 1)
22 { 78 {
23 vec_max = (fd >> 5) + 1; 79 int new_max = (fd >> 5) + 1;
24 80
25 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 81 vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
26 vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ 82 vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */
27 vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); 83 vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
28 vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ 84 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
85
86 for (; vec_max < new_max; ++vec_max)
87 ((uint32_t *)vec_ri)[vec_max] =
88 ((uint32_t *)vec_wi)[vec_max] = 0;
29 } 89 }
30 90
31 vec_ri [offs] |= mask; 91 vec_ri [offs] |= mask;
32 if (!(nev & EV_READ)) 92 if (!(nev & EV_READ))
33 vec_ri [offs] &= ~mask; 93 vec_ri [offs] &= ~mask;
34 94
35 vec_wi [offs] |= mask; 95 vec_wi [offs] |= mask;
36 if (!(nev & EV_WRITE)) 96 if (!(nev & EV_WRITE))
37 vec_wi [offs] &= ~mask; 97 vec_wi [offs] &= ~mask;
98 }
99#endif
38} 100}
39 101
102static void
40static void select_poll (ev_tstamp timeout) 103select_poll (EV_P_ ev_tstamp timeout)
41{ 104{
105 int word, offs;
42 struct timeval tv; 106 struct timeval tv;
43 int res; 107 int res;
44 108
109#if EV_SELECT_USE_FD_SET
110 memcpy (vec_ro, vec_ri, sizeof (struct fd_set));
111 memcpy (vec_wo, vec_wi, sizeof (struct fd_set));
112#else
45 memcpy (vec_ro, vec_ri, vec_max * 4); 113 memcpy (vec_ro, vec_ri, vec_max * 4);
46 memcpy (vec_wo, vec_wi, vec_max * 4); 114 memcpy (vec_wo, vec_wi, vec_max * 4);
115#endif
47 116
48 tv.tv_sec = (long)timeout; 117 tv.tv_sec = (long)timeout;
49 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 118 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
50 119
51 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 120 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
52 121
53 if (res > 0) 122 if (res < 0)
123 {
124#ifdef WIN32
125 if (errno == WSAEINTR ) errno = EINTR;
126 if (errno == WSAENOTSOCK) errno = EBADF;
127#endif
128
129 if (errno == EBADF)
130 fd_ebadf (EV_A);
131 else if (errno == ENOMEM && !syserr_cb)
132 fd_enomem (EV_A);
133 else if (errno != EINTR)
134 syserr ("(libev) select");
135
136 return;
54 { 137 }
55 int word, offs;
56 138
57 for (word = vec_max; word--; ) 139#if EV_SELECT_USE_FD_SET
140# if EV_SELECT_USE_WIN32_HANDLES
141 for (word = 0; word < anfdmax; ++word)
142 {
143 if (!anfd [word].events)
58 { 144 {
59 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) 145 int fd = _get_osfhandle (word);
60 for (offs = 4; offs--; ) 146
147 if (fd >= 0)
61 { 148 {
62 int idx = word * 4 + offs;
63 unsigned char byte_r = vec_ro [idx];
64 unsigned char byte_w = vec_wo [idx];
65 int bit;
66
67 if (byte_r | byte_w)
68 for (bit = 8; bit--; )
69 {
70 int events = 0; 149 int events = 0;
71 events |= byte_r & (1 << bit) ? EV_READ : 0;
72 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
73 150
151 if (FD_ISSET (fd, (struct fd_set *)vec_ro)) events |= EV_READ;
152 if (FD_ISSET (fd, (struct fd_set *)vec_wo)) events |= EV_WRITE;
153
74 if (events) 154 if (events)
75 fd_event (idx * 8 + bit, events); 155 fd_event (EV_A_ word, events);
76 }
77 } 156 }
78 } 157 }
79 } 158 }
80} 159# else
160 for (word = 0; word < FD_SETSIZE; ++word)
161 {
162 int events = 0;
163 if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ;
164 if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE;
81 165
166 if (events)
167 fd_event (EV_A_ word, events);
168 }
169# endif
170#else
171 for (word = vec_max; word--; )
172 {
173 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
174 for (offs = 4; offs--; )
175 {
176 int idx = word * 4 + offs;
177 unsigned char byte_r = vec_ro [idx];
178 unsigned char byte_w = vec_wo [idx];
179 int bit;
180
181 if (byte_r | byte_w)
182 for (bit = 8; bit--; )
183 {
184 int events = 0;
185 events |= byte_r & (1 << bit) ? EV_READ : 0;
186 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
187
188 if (events)
189 fd_event (EV_A_ idx * 8 + bit, events);
190 }
191 }
192 }
193#endif
194}
195
196static int
82int select_init (int flags) 197select_init (EV_P_ int flags)
83{ 198{
84 ev_method = EVMETHOD_SELECT;
85 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 199 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
86 method_modify = select_modify; 200 method_modify = select_modify;
87 method_poll = select_poll; 201 method_poll = select_poll;
88 202
89 return 1; 203#if EV_SELECT_USE_FD_SET
90} 204 vec_max = FD_SETSIZE / 32;
205 vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri);
206 vec_ro = ev_malloc (sizeof (struct fd_set));
207 vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi);
208 vec_wo = ev_malloc (sizeof (struct fd_set));
209#else
210 vec_max = 0;
211 vec_ri = 0;
212 vec_ri = 0;
213 vec_wo = 0;
214 vec_wo = 0;
215#endif
91 216
217 return EVMETHOD_SELECT;
218}
92 219
220static void
221select_destroy (EV_P)
222{
223 ev_free (vec_ri);
224 ev_free (vec_ro);
225 ev_free (vec_wi);
226 ev_free (vec_wo);
227}
228
229

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