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1 | /* |
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2 | * libev select fd activity backend |
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3 | * |
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4 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are |
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9 | * met: |
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10 | * |
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11 | * * Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * |
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14 | * * Redistributions in binary form must reproduce the above |
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15 | * copyright notice, this list of conditions and the following |
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16 | * disclaimer in the documentation and/or other materials provided |
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17 | * with the distribution. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 | */ |
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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 */ |
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38 | #ifndef WIN32 |
7 | #include <sys/select.h> |
39 | # include <sys/select.h> |
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40 | #endif |
8 | |
41 | |
9 | #include <string.h> |
42 | #include <string.h> |
10 | #include <inttypes.h> |
43 | #include <inttypes.h> |
11 | |
44 | |
12 | static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo; |
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13 | static int vec_max; |
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14 | |
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15 | static void |
45 | static void |
16 | select_modify (int fd, int oev, int nev) |
46 | select_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 | |
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51 | if (oev == nev) |
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52 | return; |
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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 */ |
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62 | |
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63 | for (; vec_max < new_max; ++vec_max) |
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64 | ((uint32_t *)vec_ri)[vec_max] = |
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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 | |
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77 | static void |
40 | static void select_poll (ev_tstamp timeout) |
78 | select_poll (EV_P_ ev_tstamp timeout) |
41 | { |
79 | { |
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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) |
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95 | fd_ebadf (EV_A); |
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96 | else if (errno == ENOMEM && !syserr_cb) |
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97 | fd_enomem (EV_A); |
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98 | else if (errno != EINTR) |
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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]) |
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60 | for (offs = 4; offs--; ) |
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61 | { |
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62 | int idx = word * 4 + offs; |
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63 | unsigned char byte_r = vec_ro [idx]; |
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64 | unsigned char byte_w = vec_wo [idx]; |
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65 | int bit; |
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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; |
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110 | unsigned char byte_r = vec_ro [idx]; |
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111 | unsigned char byte_w = vec_wo [idx]; |
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112 | int bit; |
73 | |
113 | |
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114 | if (byte_r | byte_w) |
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115 | for (bit = 8; bit--; ) |
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116 | { |
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117 | int events = 0; |
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118 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
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119 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
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120 | |
74 | if (events) |
121 | if (events) |
75 | fd_event (idx * 8 + bit, events); |
122 | fd_event (EV_A_ idx * 8 + bit, events); |
76 | } |
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77 | } |
123 | } |
78 | } |
124 | } |
79 | } |
125 | } |
80 | } |
126 | } |
81 | |
127 | |
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128 | static int |
82 | void select_init (int flags) |
129 | select_init (EV_P_ int flags) |
83 | { |
130 | { |
84 | ev_method = EVMETHOD_SELECT; |
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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; |
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134 | |
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135 | vec_max = 0; |
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136 | vec_ri = 0; |
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137 | vec_ri = 0; |
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138 | vec_wo = 0; |
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139 | vec_wo = 0; |
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140 | |
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141 | return EVMETHOD_SELECT; |
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142 | } |
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143 | |
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144 | static void |
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145 | select_destroy (EV_P) |
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146 | { |
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147 | ev_free (vec_ri); |
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148 | ev_free (vec_ro); |
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149 | ev_free (vec_wi); |
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150 | ev_free (vec_wo); |
88 | } |
151 | } |
89 | |
152 | |
90 | |
153 | |