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Comparing libev/ev_select.c (file contents):
Revision 1.4 by root, Wed Oct 31 14:44:15 2007 UTC vs.
Revision 1.13 by root, Sun Nov 4 23:14:11 2007 UTC

1/* 1/*
2 * libev select fd activity backend
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 */
38#ifndef WIN32
36#include <sys/select.h> 39# include <sys/select.h>
40#endif
37 41
38#include <string.h> 42#include <string.h>
39#include <inttypes.h> 43#include <inttypes.h>
40 44
41static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
42static int vec_max;
43
44static void 45static void
45select_modify (int fd, int oev, int nev) 46select_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
51 if (oev == nev)
52 return;
53
50 if (vec_max < (fd >> 5) + 1) 54 if (vec_max < (fd >> 5) + 1)
51 { 55 {
52 vec_max = (fd >> 5) + 1; 56 int new_max = (fd >> 5) + 1;
53 57
54 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 58 vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4);
55 vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ 59 vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */
56 vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); 60 vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4);
57 vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ 61 vec_wo = (unsigned char *)realloc (vec_wo, new_max * 4); /* could free/malloc */
62
63 for (; vec_max < new_max; ++vec_max)
64 ((uint32_t *)vec_ri)[vec_max] =
65 ((uint32_t *)vec_wi)[vec_max] = 0;
58 } 66 }
59 67
60 vec_ri [offs] |= mask; 68 vec_ri [offs] |= mask;
61 if (!(nev & EV_READ)) 69 if (!(nev & EV_READ))
62 vec_ri [offs] &= ~mask; 70 vec_ri [offs] &= ~mask;
… …
64 vec_wi [offs] |= mask; 72 vec_wi [offs] |= mask;
65 if (!(nev & EV_WRITE)) 73 if (!(nev & EV_WRITE))
66 vec_wi [offs] &= ~mask; 74 vec_wi [offs] &= ~mask;
67} 75}
68 76
77static void
69static void select_poll (ev_tstamp timeout) 78select_poll (EV_P_ ev_tstamp timeout)
70{ 79{
71 struct timeval tv; 80 struct timeval tv;
72 int res; 81 int res;
73 82
74 memcpy (vec_ro, vec_ri, vec_max * 4); 83 memcpy (vec_ro, vec_ri, vec_max * 4);
… …
99 int events = 0; 108 int events = 0;
100 events |= byte_r & (1 << bit) ? EV_READ : 0; 109 events |= byte_r & (1 << bit) ? EV_READ : 0;
101 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 110 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
102 111
103 if (events) 112 if (events)
104 fd_event (idx * 8 + bit, events); 113 fd_event (EV_A_ idx * 8 + bit, events);
105 } 114 }
106 } 115 }
107 } 116 }
108 } 117 }
118 else if (res < 0)
119 {
120 if (errno == EBADF)
121 fd_ebadf (EV_A);
122 else if (errno == ENOMEM)
123 fd_enomem (EV_A);
124 }
109} 125}
110 126
127static int
111void select_init (int flags) 128select_init (EV_P_ int flags)
112{ 129{
113 ev_method = EVMETHOD_SELECT;
114 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 130 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
115 method_modify = select_modify; 131 method_modify = select_modify;
116 method_poll = select_poll; 132 method_poll = select_poll;
133
134 vec_max = 0;
135 vec_ri = 0;
136 vec_ri = 0;
137 vec_wo = 0;
138 vec_wo = 0;
139
140 return EVMETHOD_SELECT;
141}
142
143static void
144select_destroy (EV_P)
145{
146 free (vec_ri);
147 free (vec_ro);
148 free (vec_wi);
149 free (vec_wo);
117} 150}
118 151
119 152

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