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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 1.15 by root, Tue Nov 6 00:52:33 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 *)ev_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 *)ev_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 *)ev_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 *)ev_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{
80 int word, offs;
71 struct timeval tv; 81 struct timeval tv;
72 int res; 82 int res;
73 83
74 memcpy (vec_ro, vec_ri, vec_max * 4); 84 memcpy (vec_ro, vec_ri, vec_max * 4);
75 memcpy (vec_wo, vec_wi, vec_max * 4); 85 memcpy (vec_wo, vec_wi, vec_max * 4);
… …
77 tv.tv_sec = (long)timeout; 87 tv.tv_sec = (long)timeout;
78 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 88 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
79 89
80 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);
81 91
82 if (res > 0) 92 if (res < 0)
83 { 93 {
84 int word, offs; 94 if (errno == EBADF)
95 fd_ebadf (EV_A);
96 else if (errno == ENOMEM && !syserr_cb)
97 fd_enomem (EV_A);
98 else if (errno != EINTR)
99 syserr ("(libev) select");
85 100
86 for (word = vec_max; word--; ) 101 return;
87 { 102 }
88 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
89 for (offs = 4; offs--; )
90 {
91 int idx = word * 4 + offs;
92 unsigned char byte_r = vec_ro [idx];
93 unsigned char byte_w = vec_wo [idx];
94 int bit;
95 103
96 if (byte_r | byte_w) 104 for (word = vec_max; word--; )
97 for (bit = 8; bit--; ) 105 {
98 { 106 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
99 int events = 0; 107 for (offs = 4; offs--; )
100 events |= byte_r & (1 << bit) ? EV_READ : 0; 108 {
101 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 109 int idx = word * 4 + offs;
110 unsigned char byte_r = vec_ro [idx];
111 unsigned char byte_w = vec_wo [idx];
112 int bit;
102 113
114 if (byte_r | byte_w)
115 for (bit = 8; bit--; )
116 {
117 int events = 0;
118 events |= byte_r & (1 << bit) ? EV_READ : 0;
119 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
120
103 if (events) 121 if (events)
104 fd_event (idx * 8 + bit, events); 122 fd_event (EV_A_ idx * 8 + bit, events);
105 }
106 } 123 }
107 } 124 }
108 } 125 }
109} 126}
110 127
128static int
111void select_init (int flags) 129select_init (EV_P_ int flags)
112{ 130{
113 ev_method = EVMETHOD_SELECT;
114 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 */
115 method_modify = select_modify; 132 method_modify = select_modify;
116 method_poll = select_poll; 133 method_poll = select_poll;
134
135 vec_max = 0;
136 vec_ri = 0;
137 vec_ri = 0;
138 vec_wo = 0;
139 vec_wo = 0;
140
141 return EVMETHOD_SELECT;
142}
143
144static void
145select_destroy (EV_P)
146{
147 ev_free (vec_ri);
148 ev_free (vec_ro);
149 ev_free (vec_wi);
150 ev_free (vec_wo);
117} 151}
118 152
119 153

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