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Comparing libev/ev_select.c (file contents):
Revision 1.6 by root, Wed Oct 31 20:46:44 2007 UTC vs.
Revision 1.18 by root, Wed Nov 7 13:27:56 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#if WIN32
34typedef unsigned int uint32_t;
35# ifndef EV_SELECT_USE_FD_SET
36# define EV_SELECT_USE_FD_SET 1
37# endif
38#else
36#include <sys/select.h> 39# include <sys/select.h>
40# include <inttypes.h>
41#endif
42
43#if EV_SELECT_USE_WIN32_HANDLES
44# undef EV_SELECT_USE_FD_SET
45# define EV_SELECT_USE_FD_SET 1
46#else
47#endif
37 48
38#include <string.h> 49#include <string.h>
39#include <inttypes.h>
40
41static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
42static int vec_max;
43 50
44static void 51static void
45select_modify (int fd, int oev, int nev) 52select_modify (EV_P_ int fd, int oev, int nev)
46{ 53{
54 if (oev == nev)
55 return;
56
57#if EV_SELECT_USE_FD_SET
58# if EV_SELECT_USE_WIN32_HANDLES
59 fd = _get_osfhandle (fd);
60 if (fd < 0)
61 return;
62# endif
63
64 if (nev & EV_READ)
65 FD_SET (fd, (struct fd_set *)vec_ri);
66 else
67 FD_CLR (fd, (struct fd_set *)vec_ri);
68
69 if (nev & EV_WRITE)
70 FD_SET (fd, (struct fd_set *)vec_wi);
71 else
72 FD_CLR (fd, (struct fd_set *)vec_wi);
73#else
74 {
47 int offs = fd >> 3; 75 int offs = fd >> 3;
48 int mask = 1 << (fd & 7); 76 int mask = 1 << (fd & 7);
49 77
50 if (vec_max < (fd >> 5) + 1) 78 if (vec_max < (fd >> 5) + 1)
51 { 79 {
52 int new_max = (fd >> 5) + 1; 80 int new_max = (fd >> 5) + 1;
53 81
54 vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4); 82 vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
55 vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */ 83 vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */
56 vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4); 84 vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
57 vec_wo = (unsigned char *)realloc (vec_wo, new_max * 4); /* could free/malloc */ 85 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
58 86
59 for (; vec_max < new_max; ++vec_max) 87 for (; vec_max < new_max; ++vec_max)
60 ((uint32_t *)vec_ri)[vec_max] = 88 ((uint32_t *)vec_ri)[vec_max] =
61 ((uint32_t *)vec_wi)[vec_max] = 0; 89 ((uint32_t *)vec_wi)[vec_max] = 0;
62 } 90 }
63 91
64 vec_ri [offs] |= mask; 92 vec_ri [offs] |= mask;
65 if (!(nev & EV_READ)) 93 if (!(nev & EV_READ))
66 vec_ri [offs] &= ~mask; 94 vec_ri [offs] &= ~mask;
67 95
68 vec_wi [offs] |= mask; 96 vec_wi [offs] |= mask;
69 if (!(nev & EV_WRITE)) 97 if (!(nev & EV_WRITE))
70 vec_wi [offs] &= ~mask; 98 vec_wi [offs] &= ~mask;
99 }
100#endif
71} 101}
72 102
73static void 103static void
74select_poll (ev_tstamp timeout) 104select_poll (EV_P_ ev_tstamp timeout)
75{ 105{
106 int word, offs;
76 struct timeval tv; 107 struct timeval tv;
77 int res; 108 int res;
78 109
110#if EV_SELECT_USE_FD_SET
111 memcpy (vec_ro, vec_ri, sizeof (struct fd_set));
112 memcpy (vec_wo, vec_wi, sizeof (struct fd_set));
113#else
79 memcpy (vec_ro, vec_ri, vec_max * 4); 114 memcpy (vec_ro, vec_ri, vec_max * 4);
80 memcpy (vec_wo, vec_wi, vec_max * 4); 115 memcpy (vec_wo, vec_wi, vec_max * 4);
116#endif
81 117
82 tv.tv_sec = (long)timeout; 118 tv.tv_sec = (long)timeout;
83 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 119 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
84 120
85 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 121 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
86 122
87 if (res > 0) 123 if (res < 0)
124 {
125#ifdef WIN32
126 if (errno == WSAEINTR ) errno = EINTR;
127 if (errno == WSAENOTSOCK) errno = EBADF;
128#endif
129
130 if (errno == EBADF)
131 fd_ebadf (EV_A);
132 else if (errno == ENOMEM && !syserr_cb)
133 fd_enomem (EV_A);
134 else if (errno != EINTR)
135 syserr ("(libev) select");
136
137 return;
88 { 138 }
89 int word, offs;
90 139
91 for (word = vec_max; word--; ) 140#if EV_SELECT_USE_FD_SET
141# if EV_SELECT_USE_WIN32_HANDLES
142 for (word = 0; word < anfdmax; ++word)
143 {
144 if (!anfd [word].events)
92 { 145 {
93 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) 146 int fd = _get_osfhandle (word);
94 for (offs = 4; offs--; ) 147
148 if (fd >= 0)
95 { 149 {
96 int idx = word * 4 + offs;
97 unsigned char byte_r = vec_ro [idx];
98 unsigned char byte_w = vec_wo [idx];
99 int bit;
100
101 if (byte_r | byte_w)
102 for (bit = 8; bit--; )
103 {
104 int events = 0; 150 int events = 0;
105 events |= byte_r & (1 << bit) ? EV_READ : 0;
106 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
107 151
152 if (FD_ISSET (fd, (struct fd_set *)vec_ro)) events |= EV_READ;
153 if (FD_ISSET (fd, (struct fd_set *)vec_wo)) events |= EV_WRITE;
154
108 if (events) 155 if (events)
109 fd_event (idx * 8 + bit, events); 156 fd_event (EV_A_ word, events);
110 }
111 } 157 }
112 } 158 }
113 } 159 }
114 else if (res < 0) 160# else
115 { 161 for (word = 0; word < FD_SETSIZE; ++word)
116 if (errno == EBADF)
117 fd_recheck ();
118 } 162 {
119} 163 int events = 0;
164 if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ;
165 if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE;
120 166
167 if (events)
168 fd_event (EV_A_ word, events);
169 }
170# endif
171#else
172 for (word = vec_max; word--; )
173 {
174 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
175 for (offs = 4; offs--; )
176 {
177 int idx = word * 4 + offs;
178 unsigned char byte_r = vec_ro [idx];
179 unsigned char byte_w = vec_wo [idx];
180 int bit;
181
182 if (byte_r | byte_w)
183 for (bit = 8; bit--; )
184 {
185 int events = 0;
186 events |= byte_r & (1 << bit) ? EV_READ : 0;
187 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
188
189 if (events)
190 fd_event (EV_A_ idx * 8 + bit, events);
191 }
192 }
193 }
194#endif
195}
196
121static void 197static int
122select_init (int flags) 198select_init (EV_P_ int flags)
123{ 199{
124 ev_method = EVMETHOD_SELECT;
125 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 200 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
126 method_modify = select_modify; 201 method_modify = select_modify;
127 method_poll = select_poll; 202 method_poll = select_poll;
128}
129 203
204#if EV_SELECT_USE_FD_SET
205 vec_max = FD_SETSIZE / 32;
206 vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri);
207 vec_ro = ev_malloc (sizeof (struct fd_set));
208 vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi);
209 vec_wo = ev_malloc (sizeof (struct fd_set));
210#else
211 vec_max = 0;
212 vec_ri = 0;
213 vec_ri = 0;
214 vec_wo = 0;
215 vec_wo = 0;
216#endif
217
218 return EVMETHOD_SELECT;
219}
220
221static void
222select_destroy (EV_P)
223{
224 ev_free (vec_ri);
225 ev_free (vec_ro);
226 ev_free (vec_wi);
227 ev_free (vec_wo);
228}
229
230

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