| 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 |
| … | |
… | |
| 47 | int offs = fd >> 3; |
49 | int offs = fd >> 3; |
| 48 | int mask = 1 << (fd & 7); |
50 | int mask = 1 << (fd & 7); |
| 49 | |
51 | |
| 50 | if (vec_max < (fd >> 5) + 1) |
52 | if (vec_max < (fd >> 5) + 1) |
| 51 | { |
53 | { |
| 52 | vec_max = (fd >> 5) + 1; |
54 | int new_max = (fd >> 5) + 1; |
| 53 | |
55 | |
| 54 | vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); |
56 | vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4); |
| 55 | vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ |
57 | vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */ |
| 56 | vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); |
58 | vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4); |
| 57 | vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ |
59 | vec_wo = (unsigned char *)realloc (vec_wo, new_max * 4); /* could free/malloc */ |
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60 | |
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61 | for (; vec_max < new_max; ++vec_max) |
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62 | ((uint32_t *)vec_ri)[vec_max] = |
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63 | ((uint32_t *)vec_wi)[vec_max] = 0; |
| 58 | } |
64 | } |
| 59 | |
65 | |
| 60 | vec_ri [offs] |= mask; |
66 | vec_ri [offs] |= mask; |
| 61 | if (!(nev & EV_READ)) |
67 | if (!(nev & EV_READ)) |
| 62 | vec_ri [offs] &= ~mask; |
68 | vec_ri [offs] &= ~mask; |
| … | |
… | |
| 64 | vec_wi [offs] |= mask; |
70 | vec_wi [offs] |= mask; |
| 65 | if (!(nev & EV_WRITE)) |
71 | if (!(nev & EV_WRITE)) |
| 66 | vec_wi [offs] &= ~mask; |
72 | vec_wi [offs] &= ~mask; |
| 67 | } |
73 | } |
| 68 | |
74 | |
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75 | static void |
| 69 | static void select_poll (ev_tstamp timeout) |
76 | select_poll (ev_tstamp timeout) |
| 70 | { |
77 | { |
| 71 | struct timeval tv; |
78 | struct timeval tv; |
| 72 | int res; |
79 | int res; |
| 73 | |
80 | |
| 74 | memcpy (vec_ro, vec_ri, vec_max * 4); |
81 | memcpy (vec_ro, vec_ri, vec_max * 4); |
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… | |
| 104 | fd_event (idx * 8 + bit, events); |
111 | fd_event (idx * 8 + bit, events); |
| 105 | } |
112 | } |
| 106 | } |
113 | } |
| 107 | } |
114 | } |
| 108 | } |
115 | } |
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116 | else if (res < 0) |
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117 | { |
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118 | if (errno == EBADF) |
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119 | fd_ebadf (); |
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120 | else if (errno == ENOMEM) |
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121 | fd_enomem (); |
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122 | } |
| 109 | } |
123 | } |
| 110 | |
124 | |
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125 | static void |
| 111 | void select_init (int flags) |
126 | select_init (int flags) |
| 112 | { |
127 | { |
| 113 | ev_method = EVMETHOD_SELECT; |
128 | ev_method = EVMETHOD_SELECT; |
| 114 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
129 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
| 115 | method_modify = select_modify; |
130 | method_modify = select_modify; |
| 116 | method_poll = select_poll; |
131 | method_poll = select_poll; |
| 117 | } |
132 | } |
| 118 | |
133 | |
| 119 | |
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