| 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 |
| … | |
… | |
| 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) |
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| 68 | vec_wi [offs] |= mask; |
69 | vec_wi [offs] |= mask; |
| 69 | if (!(nev & EV_WRITE)) |
70 | if (!(nev & EV_WRITE)) |
| 70 | vec_wi [offs] &= ~mask; |
71 | vec_wi [offs] &= ~mask; |
| 71 | } |
72 | } |
| 72 | |
73 | |
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74 | static void |
| 73 | static void select_poll (ev_tstamp timeout) |
75 | select_poll (EV_P_ ev_tstamp timeout) |
| 74 | { |
76 | { |
| 75 | struct timeval tv; |
77 | struct timeval tv; |
| 76 | int res; |
78 | int res; |
| 77 | |
79 | |
| 78 | memcpy (vec_ro, vec_ri, vec_max * 4); |
80 | memcpy (vec_ro, vec_ri, vec_max * 4); |
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… | |
| 111 | } |
113 | } |
| 112 | } |
114 | } |
| 113 | else if (res < 0) |
115 | else if (res < 0) |
| 114 | { |
116 | { |
| 115 | if (errno == EBADF) |
117 | if (errno == EBADF) |
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118 | fd_ebadf (); |
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119 | else if (errno == ENOMEM) |
| 116 | fd_recheck (); |
120 | fd_enomem (); |
| 117 | } |
121 | } |
| 118 | } |
122 | } |
| 119 | |
123 | |
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124 | static int |
| 120 | void select_init (int flags) |
125 | select_init (EV_P_ int flags) |
| 121 | { |
126 | { |
| 122 | ev_method = EVMETHOD_SELECT; |
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| 123 | 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 */ |
| 124 | method_modify = select_modify; |
128 | method_modify = select_modify; |
| 125 | method_poll = select_poll; |
129 | method_poll = select_poll; |
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130 | |
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131 | return EVMETHOD_SELECT; |
| 126 | } |
132 | } |
| 127 | |
133 | |
| 128 | |
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