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

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