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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 1.15 by root, Tue Nov 6 00:52:33 2007 UTC

1/*
2 * libev select fd activity backend
3 *
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 */
31
1/* for broken bsd's */ 32/* for broken bsd's */
2#include <sys/time.h> 33#include <sys/time.h>
3#include <sys/types.h> 34#include <sys/types.h>
4#include <unistd.h> 35#include <unistd.h>
5 36
6/* for unix systems */ 37/* for unix systems */
38#ifndef WIN32
7#include <sys/select.h> 39# include <sys/select.h>
40#endif
8 41
9#include <string.h> 42#include <string.h>
10#include <inttypes.h> 43#include <inttypes.h>
11 44
12static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
13static int vec_max;
14
15static void 45static void
16select_modify (int fd, int oev, int nev) 46select_modify (EV_P_ int fd, int oev, int nev)
17{ 47{
18 int offs = fd >> 3; 48 int offs = fd >> 3;
19 int mask = 1 << (fd & 7); 49 int mask = 1 << (fd & 7);
20 50
51 if (oev == nev)
52 return;
53
21 if (vec_max < (fd >> 5) + 1) 54 if (vec_max < (fd >> 5) + 1)
22 { 55 {
23 vec_max = (fd >> 5) + 1; 56 int new_max = (fd >> 5) + 1;
24 57
25 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 58 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 */ 59 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); 60 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 */ 61 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
62
63 for (; vec_max < new_max; ++vec_max)
64 ((uint32_t *)vec_ri)[vec_max] =
65 ((uint32_t *)vec_wi)[vec_max] = 0;
29 } 66 }
30 67
31 vec_ri [offs] |= mask; 68 vec_ri [offs] |= mask;
32 if (!(nev & EV_READ)) 69 if (!(nev & EV_READ))
33 vec_ri [offs] &= ~mask; 70 vec_ri [offs] &= ~mask;
… …
35 vec_wi [offs] |= mask; 72 vec_wi [offs] |= mask;
36 if (!(nev & EV_WRITE)) 73 if (!(nev & EV_WRITE))
37 vec_wi [offs] &= ~mask; 74 vec_wi [offs] &= ~mask;
38} 75}
39 76
77static void
40static void select_poll (ev_tstamp timeout) 78select_poll (EV_P_ ev_tstamp timeout)
41{ 79{
80 int word, offs;
42 struct timeval tv; 81 struct timeval tv;
43 int res; 82 int res;
44 83
45 memcpy (vec_ro, vec_ri, vec_max * 4); 84 memcpy (vec_ro, vec_ri, vec_max * 4);
46 memcpy (vec_wo, vec_wi, vec_max * 4); 85 memcpy (vec_wo, vec_wi, vec_max * 4);
… …
48 tv.tv_sec = (long)timeout; 87 tv.tv_sec = (long)timeout;
49 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 88 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
50 89
51 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 90 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
52 91
53 if (res > 0) 92 if (res < 0)
54 { 93 {
55 int word, offs; 94 if (errno == EBADF)
95 fd_ebadf (EV_A);
96 else if (errno == ENOMEM && !syserr_cb)
97 fd_enomem (EV_A);
98 else if (errno != EINTR)
99 syserr ("(libev) select");
56 100
57 for (word = vec_max; word--; ) 101 return;
58 { 102 }
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;
66 103
67 if (byte_r | byte_w) 104 for (word = vec_max; word--; )
68 for (bit = 8; bit--; ) 105 {
69 { 106 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
70 int events = 0; 107 for (offs = 4; offs--; )
71 events |= byte_r & (1 << bit) ? EV_READ : 0; 108 {
72 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 109 int idx = word * 4 + offs;
110 unsigned char byte_r = vec_ro [idx];
111 unsigned char byte_w = vec_wo [idx];
112 int bit;
73 113
114 if (byte_r | byte_w)
115 for (bit = 8; bit--; )
116 {
117 int events = 0;
118 events |= byte_r & (1 << bit) ? EV_READ : 0;
119 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
120
74 if (events) 121 if (events)
75 fd_event (idx * 8 + bit, events); 122 fd_event (EV_A_ idx * 8 + bit, events);
76 }
77 } 123 }
78 } 124 }
79 } 125 }
80} 126}
81 127
128static int
82int select_init (int flags) 129select_init (EV_P_ int flags)
83{ 130{
84 ev_method = EVMETHOD_SELECT;
85 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 131 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
86 method_modify = select_modify; 132 method_modify = select_modify;
87 method_poll = select_poll; 133 method_poll = select_poll;
88 134
89 return 1; 135 vec_max = 0;
136 vec_ri = 0;
137 vec_ri = 0;
138 vec_wo = 0;
139 vec_wo = 0;
140
141 return EVMETHOD_SELECT;
142}
143
144static void
145select_destroy (EV_P)
146{
147 ev_free (vec_ri);
148 ev_free (vec_ro);
149 ev_free (vec_wi);
150 ev_free (vec_wo);
90} 151}
91 152
92 153

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