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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 1.19 by root, Thu Nov 8 16:58:00 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#endif
37 47
38#include <string.h> 48#include <string.h>
39#include <inttypes.h>
40
41static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
42static int vec_max;
43 49
44static void 50static void
45select_modify (int fd, int oev, int nev) 51select_modify (EV_P_ int fd, int oev, int nev)
46{ 52{
53 if (oev == nev)
54 return;
55
56#if EV_SELECT_USE_FD_SET
57# if EV_SELECT_USE_WIN32_HANDLES
58 fd = _get_osfhandle (fd);
59 if (fd < 0)
60 return;
61# endif
62
63 if (nev & EV_READ)
64 FD_SET (fd, (struct fd_set *)vec_ri);
65 else
66 FD_CLR (fd, (struct fd_set *)vec_ri);
67
68 if (nev & EV_WRITE)
69 FD_SET (fd, (struct fd_set *)vec_wi);
70 else
71 FD_CLR (fd, (struct fd_set *)vec_wi);
72#else
73 {
47 int offs = fd >> 3; 74 int offs = fd >> 3;
48 int mask = 1 << (fd & 7); 75 int mask = 1 << (fd & 7);
49 76
50 if (vec_max < (fd >> 5) + 1) 77 if (vec_max < (fd >> 5) + 1)
51 { 78 {
52 vec_max = (fd >> 5) + 1; 79 int new_max = (fd >> 5) + 1;
53 80
54 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 81 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 */ 82 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); 83 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 */ 84 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
85
86 for (; vec_max < new_max; ++vec_max)
87 ((uint32_t *)vec_ri)[vec_max] =
88 ((uint32_t *)vec_wi)[vec_max] = 0;
58 } 89 }
59 90
60 vec_ri [offs] |= mask; 91 vec_ri [offs] |= mask;
61 if (!(nev & EV_READ)) 92 if (!(nev & EV_READ))
62 vec_ri [offs] &= ~mask; 93 vec_ri [offs] &= ~mask;
63 94
64 vec_wi [offs] |= mask; 95 vec_wi [offs] |= mask;
65 if (!(nev & EV_WRITE)) 96 if (!(nev & EV_WRITE))
66 vec_wi [offs] &= ~mask; 97 vec_wi [offs] &= ~mask;
98 }
99#endif
67} 100}
68 101
102static void
69static void select_poll (ev_tstamp timeout) 103select_poll (EV_P_ ev_tstamp timeout)
70{ 104{
105 int word, offs;
71 struct timeval tv; 106 struct timeval tv;
72 int res; 107 int res;
73 108
109#if EV_SELECT_USE_FD_SET
110 memcpy (vec_ro, vec_ri, sizeof (struct fd_set));
111 memcpy (vec_wo, vec_wi, sizeof (struct fd_set));
112#else
74 memcpy (vec_ro, vec_ri, vec_max * 4); 113 memcpy (vec_ro, vec_ri, vec_max * 4);
75 memcpy (vec_wo, vec_wi, vec_max * 4); 114 memcpy (vec_wo, vec_wi, vec_max * 4);
115#endif
76 116
77 tv.tv_sec = (long)timeout; 117 tv.tv_sec = (long)timeout;
78 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 118 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
79 119
80 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 120 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
81 121
82 if (res > 0) 122 if (res < 0)
123 {
124#ifdef WIN32
125 if (errno == WSAEINTR ) errno = EINTR;
126 if (errno == WSAENOTSOCK) errno = EBADF;
127#endif
128
129 if (errno == EBADF)
130 fd_ebadf (EV_A);
131 else if (errno == ENOMEM && !syserr_cb)
132 fd_enomem (EV_A);
133 else if (errno != EINTR)
134 syserr ("(libev) select");
135
136 return;
83 { 137 }
84 int word, offs;
85 138
86 for (word = vec_max; word--; ) 139#if EV_SELECT_USE_FD_SET
140# if EV_SELECT_USE_WIN32_HANDLES
141 for (word = 0; word < anfdmax; ++word)
142 {
143 if (!anfd [word].events)
87 { 144 {
88 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) 145 int fd = _get_osfhandle (word);
89 for (offs = 4; offs--; ) 146
147 if (fd >= 0)
90 { 148 {
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
96 if (byte_r | byte_w)
97 for (bit = 8; bit--; )
98 {
99 int events = 0; 149 int events = 0;
100 events |= byte_r & (1 << bit) ? EV_READ : 0;
101 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
102 150
151 if (FD_ISSET (fd, (struct fd_set *)vec_ro)) events |= EV_READ;
152 if (FD_ISSET (fd, (struct fd_set *)vec_wo)) events |= EV_WRITE;
153
103 if (events) 154 if (events)
104 fd_event (idx * 8 + bit, events); 155 fd_event (EV_A_ word, events);
105 }
106 } 156 }
107 } 157 }
108 } 158 }
109} 159# else
160 for (word = 0; word < FD_SETSIZE; ++word)
161 {
162 int events = 0;
163 if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ;
164 if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE;
110 165
166 if (events)
167 fd_event (EV_A_ word, events);
168 }
169# endif
170#else
171 for (word = vec_max; word--; )
172 {
173 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
174 for (offs = 4; offs--; )
175 {
176 int idx = word * 4 + offs;
177 unsigned char byte_r = vec_ro [idx];
178 unsigned char byte_w = vec_wo [idx];
179 int bit;
180
181 if (byte_r | byte_w)
182 for (bit = 8; bit--; )
183 {
184 int events = 0;
185 events |= byte_r & (1 << bit) ? EV_READ : 0;
186 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
187
188 if (events)
189 fd_event (EV_A_ idx * 8 + bit, events);
190 }
191 }
192 }
193#endif
194}
195
196static int
111void select_init (int flags) 197select_init (EV_P_ int flags)
112{ 198{
113 ev_method = EVMETHOD_SELECT;
114 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 199 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
115 method_modify = select_modify; 200 method_modify = select_modify;
116 method_poll = select_poll; 201 method_poll = select_poll;
117}
118 202
203#if EV_SELECT_USE_FD_SET
204 vec_max = FD_SETSIZE / 32;
205 vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri);
206 vec_ro = ev_malloc (sizeof (struct fd_set));
207 vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi);
208 vec_wo = ev_malloc (sizeof (struct fd_set));
209#else
210 vec_max = 0;
211 vec_ri = 0;
212 vec_ri = 0;
213 vec_wo = 0;
214 vec_wo = 0;
215#endif
119 216
217 return EVMETHOD_SELECT;
218}
219
220static void
221select_destroy (EV_P)
222{
223 ev_free (vec_ri);
224 ev_free (vec_ro);
225 ev_free (vec_wi);
226 ev_free (vec_wo);
227}
228
229

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