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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 1.13 by root, Sun Nov 4 23:14:11 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 *)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 *)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 *)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 *)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{
42 struct timeval tv; 80 struct timeval tv;
43 int res; 81 int res;
44 82
45 memcpy (vec_ro, vec_ri, vec_max * 4); 83 memcpy (vec_ro, vec_ri, vec_max * 4);
… …
70 int events = 0; 108 int events = 0;
71 events |= byte_r & (1 << bit) ? EV_READ : 0; 109 events |= byte_r & (1 << bit) ? EV_READ : 0;
72 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 110 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
73 111
74 if (events) 112 if (events)
75 fd_event (idx * 8 + bit, events); 113 fd_event (EV_A_ idx * 8 + bit, events);
76 } 114 }
77 } 115 }
78 } 116 }
79 } 117 }
118 else if (res < 0)
119 {
120 if (errno == EBADF)
121 fd_ebadf (EV_A);
122 else if (errno == ENOMEM)
123 fd_enomem (EV_A);
124 }
80} 125}
81 126
127static int
82void select_init (int flags) 128select_init (EV_P_ int flags)
83{ 129{
84 ev_method = EVMETHOD_SELECT;
85 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 130 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
86 method_modify = select_modify; 131 method_modify = select_modify;
87 method_poll = select_poll; 132 method_poll = select_poll;
133
134 vec_max = 0;
135 vec_ri = 0;
136 vec_ri = 0;
137 vec_wo = 0;
138 vec_wo = 0;
139
140 return EVMETHOD_SELECT;
141}
142
143static void
144select_destroy (EV_P)
145{
146 free (vec_ri);
147 free (vec_ro);
148 free (vec_wi);
149 free (vec_wo);
88} 150}
89 151
90 152

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