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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 1.26 by root, Sun Dec 9 03:51:19 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
32#ifndef _WIN32
6/* for unix systems */ 33/* for unix systems */
7#include <sys/select.h> 34# include <sys/select.h>
35# include <inttypes.h>
36#endif
37
38#ifndef EV_SELECT_USE_FD_SET
39# ifdef NFDBITS
40# define EV_SELECT_USE_FD_SET 0
41# else
42# define EV_SELECT_USE_FD_SET 1
43# endif
44#endif
45
46#if EV_SELECT_IS_WINSOCKET
47# undef EV_SELECT_USE_FD_SET
48# define EV_SELECT_USE_FD_SET 1
49# undef EINTR
50# define EINTR WSAEINTR
51# undef EBADF
52# define EBADF WSAENOTSOCK
53# undef ENOMEM
54# define ENOMEM (errno + 1)
55#endif
56
57#if !EV_SELECT_USE_FD_SET
58# define NFDBYTES (NFDBITS / 8)
59#endif
8 60
9#include <string.h> 61#include <string.h>
10#include <inttypes.h>
11
12static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
13static int vec_max;
14 62
15static void 63static void
16select_modify (int fd, int oev, int nev) 64select_modify (EV_P_ int fd, int oev, int nev)
17{ 65{
18 int offs = fd >> 3; 66 if (oev == nev)
67 return;
68
69 {
70#if EV_SELECT_USE_FD_SET
71
72 #if EV_SELECT_IS_WINSOCKET
73 SOCKET handle = anfds [fd].handle;
74 #else
75 int handle = fd;
76 #endif
77
78 if (nev & EV_READ)
79 FD_SET (handle, (fd_set *)vec_ri);
80 else
81 FD_CLR (handle, (fd_set *)vec_ri);
82
83 if (nev & EV_WRITE)
84 FD_SET (handle, (fd_set *)vec_wi);
85 else
86 FD_CLR (handle, (fd_set *)vec_wi);
87
88#else
89
90 int word = fd / NFDBITS;
19 int mask = 1 << (fd & 7); 91 int mask = 1UL << (fd % NFDBITS);
20 92
21 if (vec_max < (fd >> 5) + 1) 93 if (expect_false (vec_max < word + 1))
22 { 94 {
23 vec_max = (fd >> 5) + 1; 95 int new_max = word + 1;
24 96
25 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 97 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
26 vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ 98 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
27 vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); 99 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
28 vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ 100 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
101
102 for (; vec_max < new_max; ++vec_max)
103 ((fd_mask *)vec_ri)[vec_max] =
104 ((fd_mask *)vec_wi)[vec_max] = 0;
29 } 105 }
30 106
31 vec_ri [offs] |= mask; 107 ((fd_mask *)vec_ri) [word] |= mask;
32 if (!(nev & EV_READ)) 108 if (!(nev & EV_READ))
33 vec_ri [offs] &= ~mask; 109 ((fd_mask *)vec_ri) [word] &= ~mask;
34 110
35 vec_wi [offs] |= mask; 111 ((fd_mask *)vec_wi) [word] |= mask;
36 if (!(nev & EV_WRITE)) 112 if (!(nev & EV_WRITE))
37 vec_wi [offs] &= ~mask; 113 ((fd_mask *)vec_wi) [word] &= ~mask;
114#endif
115 }
38} 116}
39 117
118static void
40static void select_poll (ev_tstamp timeout) 119select_poll (EV_P_ ev_tstamp timeout)
41{ 120{
42 struct timeval tv; 121 struct timeval tv;
43 int res; 122 int res;
44 123
124#if EV_SELECT_USE_FD_SET
125 memcpy (vec_ro, vec_ri, sizeof (fd_set));
126 memcpy (vec_wo, vec_wi, sizeof (fd_set));
127#else
45 memcpy (vec_ro, vec_ri, vec_max * 4); 128 memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
46 memcpy (vec_wo, vec_wi, vec_max * 4); 129 memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
130#endif
47 131
48 tv.tv_sec = (long)timeout; 132 tv.tv_sec = (long)timeout;
49 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 133 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
50 134
51 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 135 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
52 136
53 if (res > 0) 137 if (expect_false (res < 0))
54 { 138 {
55 int word, offs; 139 #if EV_SELECT_IS_WINSOCKET
140 errno = WSAGetLastError ();
141 #endif
56 142
57 for (word = vec_max; word--; ) 143 if (errno == EBADF)
144 fd_ebadf (EV_A);
145 else if (errno == ENOMEM && !syserr_cb)
146 fd_enomem (EV_A);
147 else if (errno != EINTR)
148 syserr ("(libev) select");
149
150 return;
151 }
152
153#if EV_SELECT_USE_FD_SET
154
155 {
156 int fd;
157
158 for (fd = 0; fd < anfdmax; ++fd)
159 if (anfds [fd].events)
58 { 160 {
59 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
60 for (offs = 4; offs--; )
61 {
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; 161 int events = 0;
71 events |= byte_r & (1 << bit) ? EV_READ : 0; 162 #if EV_SELECT_IS_WINSOCKET
72 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 163 SOCKET handle = anfds [fd].handle;
164 #else
165 int handle = fd;
166 #endif
73 167
74 if (events) 168 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
75 fd_event (idx * 8 + bit, events); 169 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
76 } 170
77 } 171 if (expect_true (events))
172 fd_event (EV_A_ fd, events);
78 } 173 }
174 }
175
176#else
177
178 {
179 int word, bit;
180 for (word = vec_max; word--; )
181 {
182 fd_mask word_r = ((fd_mask *)vec_ro) [word];
183 fd_mask word_w = ((fd_mask *)vec_wo) [word];
184
185 if (word_r || word_w)
186 for (bit = NFDBITS; bit--; )
187 {
188 fd_mask mask = 1UL << bit;
189 int events = 0;
190
191 events |= word_r & mask ? EV_READ : 0;
192 events |= word_w & mask ? EV_WRITE : 0;
193
194 if (expect_true (events))
195 fd_event (EV_A_ word * NFDBITS + bit, events);
196 }
79 } 197 }
80} 198 }
81 199
200#endif
201}
202
203int inline_size
82void select_init (int flags) 204select_init (EV_P_ int flags)
83{ 205{
84 ev_method = EVMETHOD_SELECT; 206 backend_fudge = 0.; /* posix says this is zero */
85 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
86 method_modify = select_modify; 207 backend_modify = select_modify;
87 method_poll = select_poll; 208 backend_poll = select_poll;
88}
89 209
210#if EV_SELECT_USE_FD_SET
211 vec_max = FD_SETSIZE / 32;
212 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
213 vec_ro = ev_malloc (sizeof (fd_set));
214 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
215 vec_wo = ev_malloc (sizeof (fd_set));
216#else
217 vec_max = 0;
218 vec_ri = 0;
219 vec_ri = 0;
220 vec_wo = 0;
221 vec_wo = 0;
222#endif
90 223
224 return EVBACKEND_SELECT;
225}
226
227void inline_size
228select_destroy (EV_P)
229{
230 ev_free (vec_ri);
231 ev_free (vec_ro);
232 ev_free (vec_wi);
233 ev_free (vec_wo);
234}
235
236

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