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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 1.17 by root, Tue Nov 6 16:09:37 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
… …
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */ 30 */
29 31
30/* for broken bsd's */
31#include <sys/time.h>
32#include <sys/types.h>
33#include <unistd.h>
34
35/* for unix systems */ 32/* for unix systems */
33#ifdef WIN32
34typedef unsigned int uint32_t;
35# define EV_SELECT_USE_FD_SET 1
36#else
36#include <sys/select.h> 37# include <sys/select.h>
38# include <inttypes.h>
39#endif
37 40
38#include <string.h> 41#include <string.h>
39#include <inttypes.h>
40
41static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
42static int vec_max;
43 42
44static void 43static void
45select_modify (int fd, int oev, int nev) 44select_modify (EV_P_ int fd, int oev, int nev)
46{ 45{
47 int offs = fd >> 3; 46 if (oev == nev)
48 int mask = 1 << (fd & 7); 47 return;
49 48
50 if (vec_max < (fd >> 5) + 1) 49#if EV_SELECT_USE_FD_SET
51 { 50 if (nev & EV_READ)
52 vec_max = (fd >> 5) + 1; 51 FD_SET (fd, (struct fd_set *)vec_ri);
52 else
53 FD_CLR (fd, (struct fd_set *)vec_ri);
53 54
54 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 55 if (nev & EV_WRITE)
55 vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ 56 FD_SET (fd, (struct fd_set *)vec_wi);
56 vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); 57 else
57 vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ 58 FD_CLR (fd, (struct fd_set *)vec_wi);
58 } 59#else
60 {
61 int offs = fd >> 3;
62 int mask = 1 << (fd & 7);
59 63
60 vec_ri [offs] |= mask; 64 if (vec_max < (fd >> 5) + 1)
61 if (!(nev & EV_READ)) 65 {
62 vec_ri [offs] &= ~mask; 66 int new_max = (fd >> 5) + 1;
63 67
68 vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
69 vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */
70 vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
71 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
72
73 for (; vec_max < new_max; ++vec_max)
74 ((uint32_t *)vec_ri)[vec_max] =
75 ((uint32_t *)vec_wi)[vec_max] = 0;
76 }
77
78 vec_ri [offs] |= mask;
79 if (!(nev & EV_READ))
80 vec_ri [offs] &= ~mask;
81
64 vec_wi [offs] |= mask; 82 vec_wi [offs] |= mask;
65 if (!(nev & EV_WRITE)) 83 if (!(nev & EV_WRITE))
66 vec_wi [offs] &= ~mask; 84 vec_wi [offs] &= ~mask;
85 }
86#endif
67} 87}
68 88
89static void
69static void select_poll (ev_tstamp timeout) 90select_poll (EV_P_ ev_tstamp timeout)
70{ 91{
92 int word, offs;
71 struct timeval tv; 93 struct timeval tv;
72 int res; 94 int res;
73 95
96#if EV_SELECT_USE_FD_SET
97 memcpy (vec_ro, vec_ri, sizeof (struct fd_set));
98 memcpy (vec_wo, vec_wi, sizeof (struct fd_set));
99#else
74 memcpy (vec_ro, vec_ri, vec_max * 4); 100 memcpy (vec_ro, vec_ri, vec_max * 4);
75 memcpy (vec_wo, vec_wi, vec_max * 4); 101 memcpy (vec_wo, vec_wi, vec_max * 4);
102#endif
76 103
77 tv.tv_sec = (long)timeout; 104 tv.tv_sec = (long)timeout;
78 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 105 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
79 106
80 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 107 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
81 108
82 if (res > 0) 109 if (res < 0)
83 { 110 {
84 int word, offs; 111#ifdef WIN32
112 if (errno == WSAEINTR ) errno = EINTR;
113 if (errno == WSAENOTSOCK) errno = EBADF;
114#endif
85 115
86 for (word = vec_max; word--; ) 116 if (errno == EBADF)
87 { 117 fd_ebadf (EV_A);
88 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) 118 else if (errno == ENOMEM && !syserr_cb)
89 for (offs = 4; offs--; ) 119 fd_enomem (EV_A);
90 { 120 else if (errno != EINTR)
91 int idx = word * 4 + offs; 121 syserr ("(libev) select");
92 unsigned char byte_r = vec_ro [idx];
93 unsigned char byte_w = vec_wo [idx];
94 int bit;
95 122
96 if (byte_r | byte_w) 123 return;
97 for (bit = 8; bit--; ) 124 }
98 {
99 int events = 0;
100 events |= byte_r & (1 << bit) ? EV_READ : 0;
101 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
102 125
103 if (events) 126#if EV_SELECT_USE_FD_SET
104 fd_event (idx * 8 + bit, events); 127 for (word = 0; word < FD_SETSIZE; ++word)
105 } 128 {
106 } 129 int events = 0;
107 } 130 if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ;
131 if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE;
132
133 if (events)
134 fd_event (EV_A_ word, events);
108 } 135 }
136#else
137 for (word = vec_max; word--; )
138 {
139 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
140 for (offs = 4; offs--; )
141 {
142 int idx = word * 4 + offs;
143 unsigned char byte_r = vec_ro [idx];
144 unsigned char byte_w = vec_wo [idx];
145 int bit;
146
147 if (byte_r | byte_w)
148 for (bit = 8; bit--; )
149 {
150 int events = 0;
151 events |= byte_r & (1 << bit) ? EV_READ : 0;
152 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
153
154 if (events)
155 fd_event (EV_A_ idx * 8 + bit, events);
156 }
157 }
158 }
159#endif
109} 160}
110 161
162static int
111void select_init (int flags) 163select_init (EV_P_ int flags)
112{ 164{
113 ev_method = EVMETHOD_SELECT;
114 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 165 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
115 method_modify = select_modify; 166 method_modify = select_modify;
116 method_poll = select_poll; 167 method_poll = select_poll;
168
169#if EV_SELECT_USE_FD_SET
170 vec_max = FD_SETSIZE / 32;
171 vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri);
172 vec_ro = ev_malloc (sizeof (struct fd_set));
173 vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi);
174 vec_wo = ev_malloc (sizeof (struct fd_set));
175#else
176 vec_max = 0;
177 vec_ri = 0;
178 vec_ri = 0;
179 vec_wo = 0;
180 vec_wo = 0;
181#endif
182
183 return EVMETHOD_SELECT;
184}
185
186static void
187select_destroy (EV_P)
188{
189 ev_free (vec_ri);
190 ev_free (vec_ro);
191 ev_free (vec_wi);
192 ev_free (vec_wo);
117} 193}
118 194
119 195

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