1 | /* |
1 | /* |
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2 | * libev select fd activity backend |
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3 | * |
2 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
3 | * All rights reserved. |
5 | * All rights reserved. |
4 | * |
6 | * |
5 | * Redistribution and use in source and binary forms, with or without |
7 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions are |
8 | * modification, are permitted provided that the following conditions are |
… | |
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31 | #include <sys/time.h> |
33 | #include <sys/time.h> |
32 | #include <sys/types.h> |
34 | #include <sys/types.h> |
33 | #include <unistd.h> |
35 | #include <unistd.h> |
34 | |
36 | |
35 | /* for unix systems */ |
37 | /* for unix systems */ |
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38 | #ifndef WIN32 |
36 | #include <sys/select.h> |
39 | # include <sys/select.h> |
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40 | #endif |
37 | |
41 | |
38 | #include <string.h> |
42 | #include <string.h> |
39 | #include <inttypes.h> |
43 | #include <inttypes.h> |
40 | |
44 | |
41 | static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo; |
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42 | static int vec_max; |
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43 | |
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44 | static void |
45 | static void |
45 | select_modify (int fd, int oev, int nev) |
46 | select_modify (EV_P_ int fd, int oev, int nev) |
46 | { |
47 | { |
47 | int offs = fd >> 3; |
48 | int offs = fd >> 3; |
48 | int mask = 1 << (fd & 7); |
49 | int mask = 1 << (fd & 7); |
49 | |
50 | |
50 | if (vec_max < (fd >> 5) + 1) |
51 | if (vec_max < (fd >> 5) + 1) |
51 | { |
52 | { |
52 | vec_max = (fd >> 5) + 1; |
53 | int new_max = (fd >> 5) + 1; |
53 | |
54 | |
54 | vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); |
55 | vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4); |
55 | vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ |
56 | vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */ |
56 | vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); |
57 | vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4); |
57 | vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ |
58 | vec_wo = (unsigned char *)realloc (vec_wo, new_max * 4); /* could free/malloc */ |
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59 | |
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60 | for (; vec_max < new_max; ++vec_max) |
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61 | ((uint32_t *)vec_ri)[vec_max] = |
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62 | ((uint32_t *)vec_wi)[vec_max] = 0; |
58 | } |
63 | } |
59 | |
64 | |
60 | vec_ri [offs] |= mask; |
65 | vec_ri [offs] |= mask; |
61 | if (!(nev & EV_READ)) |
66 | if (!(nev & EV_READ)) |
62 | vec_ri [offs] &= ~mask; |
67 | vec_ri [offs] &= ~mask; |
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64 | vec_wi [offs] |= mask; |
69 | vec_wi [offs] |= mask; |
65 | if (!(nev & EV_WRITE)) |
70 | if (!(nev & EV_WRITE)) |
66 | vec_wi [offs] &= ~mask; |
71 | vec_wi [offs] &= ~mask; |
67 | } |
72 | } |
68 | |
73 | |
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74 | static void |
69 | static void select_poll (ev_tstamp timeout) |
75 | select_poll (EV_P_ ev_tstamp timeout) |
70 | { |
76 | { |
71 | struct timeval tv; |
77 | struct timeval tv; |
72 | int res; |
78 | int res; |
73 | |
79 | |
74 | memcpy (vec_ro, vec_ri, vec_max * 4); |
80 | memcpy (vec_ro, vec_ri, vec_max * 4); |
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99 | int events = 0; |
105 | int events = 0; |
100 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
106 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
101 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
107 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
102 | |
108 | |
103 | if (events) |
109 | if (events) |
104 | fd_event (idx * 8 + bit, events); |
110 | fd_event (EV_A_ idx * 8 + bit, events); |
105 | } |
111 | } |
106 | } |
112 | } |
107 | } |
113 | } |
108 | } |
114 | } |
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115 | else if (res < 0) |
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116 | { |
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117 | if (errno == EBADF) |
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118 | fd_ebadf (EV_A); |
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119 | else if (errno == ENOMEM) |
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120 | fd_enomem (EV_A); |
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121 | } |
109 | } |
122 | } |
110 | |
123 | |
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124 | static int |
111 | void select_init (int flags) |
125 | select_init (EV_P_ int flags) |
112 | { |
126 | { |
113 | ev_method = EVMETHOD_SELECT; |
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114 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
127 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
115 | method_modify = select_modify; |
128 | method_modify = select_modify; |
116 | method_poll = select_poll; |
129 | method_poll = select_poll; |
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130 | |
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131 | vec_max = 0; |
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132 | vec_ri = 0; |
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133 | vec_ri = 0; |
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134 | vec_wo = 0; |
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135 | vec_wo = 0; |
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136 | |
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137 | return EVMETHOD_SELECT; |
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138 | } |
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139 | |
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140 | static void |
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141 | select_destroy (EV_P) |
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142 | { |
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143 | free (vec_ri); |
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144 | free (vec_ro); |
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145 | free (vec_wi); |
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146 | free (vec_wo); |
117 | } |
147 | } |
118 | |
148 | |
119 | |
149 | |