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Comparing libev/ev_select.c (file contents):
Revision 1.11 by root, Sun Nov 4 00:24:17 2007 UTC vs.
Revision 1.21 by root, Fri Nov 23 05:00:45 2007 UTC

… …
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (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
29 * 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.
30 */ 30 */
31 31
32/* for broken bsd's */ 32#ifndef _WIN32
33#include <sys/time.h>
34#include <sys/types.h>
35#include <unistd.h>
36
37/* for unix systems */ 33/* for unix systems */
38#ifndef WIN32
39# include <sys/select.h> 34# include <sys/select.h>
35# include <inttypes.h>
36#endif
37
38#ifndef EV_SELECT_USE_FD_SET
39# ifdef NFDBITS
40# define EV_SELECT_USE_FD_SET 0
41# else
42# define EV_SELECT_USE_FD_SET 1
43# endif
44#endif
45
46#if EV_SELECT_IS_WINSOCKET
47# undef EV_SELECT_USE_FD_SET
48# define EV_SELECT_USE_FD_SET 1
49# undef EINTR
50# define EINTR WSAEINTR
51# undef EBADF
52# define EBADF WSAENOTSOCK
53# undef ENOMEM
54# define ENOMEM (errno + 1)
55#endif
56
57#if !EV_SELECT_USE_FD_SET
58# define NFDBYTES (NFDBITS / 8)
40#endif 59#endif
41 60
42#include <string.h> 61#include <string.h>
43#include <inttypes.h>
44 62
45static void 63static void
46select_modify (EV_P_ int fd, int oev, int nev) 64select_modify (EV_P_ int fd, int oev, int nev)
47{ 65{
48 int offs = fd >> 3; 66 if (oev == nev)
67 return;
68
69 {
70#if EV_SELECT_USE_FD_SET
71
72 #if EV_SELECT_IS_WINSOCKET
73 SOCKET handle = anfds [fd].handle;
74 #else
75 int handle = fd;
76 #endif
77
78 if (nev & EV_READ)
79 FD_SET (handle, (fd_set *)vec_ri);
80 else
81 FD_CLR (handle, (fd_set *)vec_ri);
82
83 if (nev & EV_WRITE)
84 FD_SET (handle, (fd_set *)vec_wi);
85 else
86 FD_CLR (handle, (fd_set *)vec_wi);
87
88#else
89
90 int word = fd / NFDBITS;
49 int mask = 1 << (fd & 7); 91 int mask = 1UL << (fd % NFDBITS);
50 92
51 if (vec_max < (fd >> 5) + 1) 93 if (vec_max < word + 1)
52 { 94 {
53 int new_max = (fd >> 5) + 1; 95 int new_max = word + 1;
54 96
55 vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4); 97 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
56 vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */ 98 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
57 vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4); 99 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
58 vec_wo = (unsigned char *)realloc (vec_wo, new_max * 4); /* could free/malloc */ 100 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
59 101
60 for (; vec_max < new_max; ++vec_max) 102 for (; vec_max < new_max; ++vec_max)
61 ((uint32_t *)vec_ri)[vec_max] = 103 ((fd_mask *)vec_ri)[vec_max] =
62 ((uint32_t *)vec_wi)[vec_max] = 0; 104 ((fd_mask *)vec_wi)[vec_max] = 0;
63 } 105 }
64 106
65 vec_ri [offs] |= mask; 107 ((fd_mask *)vec_ri) [word] |= mask;
66 if (!(nev & EV_READ)) 108 if (!(nev & EV_READ))
67 vec_ri [offs] &= ~mask; 109 ((fd_mask *)vec_ri) [word] &= ~mask;
68 110
69 vec_wi [offs] |= mask; 111 ((fd_mask *)vec_wi) [word] |= mask;
70 if (!(nev & EV_WRITE)) 112 if (!(nev & EV_WRITE))
71 vec_wi [offs] &= ~mask; 113 ((fd_mask *)vec_wi) [word] &= ~mask;
114#endif
115 }
72} 116}
73 117
74static void 118static void
75select_poll (EV_P_ ev_tstamp timeout) 119select_poll (EV_P_ ev_tstamp timeout)
76{ 120{
77 struct timeval tv; 121 struct timeval tv;
78 int res; 122 int res;
79 123
124#if EV_SELECT_USE_FD_SET
125 memcpy (vec_ro, vec_ri, sizeof (fd_set));
126 memcpy (vec_wo, vec_wi, sizeof (fd_set));
127#else
80 memcpy (vec_ro, vec_ri, vec_max * 4); 128 memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
81 memcpy (vec_wo, vec_wi, vec_max * 4); 129 memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
130#endif
82 131
83 tv.tv_sec = (long)timeout; 132 tv.tv_sec = (long)timeout;
84 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 133 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
85 134
86 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 135 res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
87 136
88 if (res > 0) 137 if (res < 0)
89 { 138 {
90 int word, offs; 139 #if EV_SELECT_IS_WINSOCKET
140 errno = WSAGetLastError ();
141 #endif
91 142
92 for (word = vec_max; word--; )
93 {
94 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
95 for (offs = 4; offs--; )
96 {
97 int idx = word * 4 + offs;
98 unsigned char byte_r = vec_ro [idx];
99 unsigned char byte_w = vec_wo [idx];
100 int bit;
101
102 if (byte_r | byte_w)
103 for (bit = 8; bit--; )
104 {
105 int events = 0;
106 events |= byte_r & (1 << bit) ? EV_READ : 0;
107 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
108
109 if (events)
110 fd_event (EV_A_ idx * 8 + bit, events);
111 }
112 }
113 }
114 }
115 else if (res < 0)
116 {
117 if (errno == EBADF) 143 if (errno == EBADF)
118 fd_ebadf (EV_A); 144 fd_ebadf (EV_A);
119 else if (errno == ENOMEM) 145 else if (errno == ENOMEM && !syserr_cb)
120 fd_enomem (EV_A); 146 fd_enomem (EV_A);
147 else if (errno != EINTR)
148 syserr ("(libev) select");
149
150 return;
121 } 151 }
152
153#if EV_SELECT_USE_FD_SET
154
155 {
156 int fd;
157
158 for (fd = 0; fd < anfdmax; ++fd)
159 if (anfds [fd].events)
160 {
161 int events = 0;
162 #if EV_SELECT_IS_WINSOCKET
163 SOCKET handle = anfds [fd].handle;
164 #else
165 int handle = fd;
166 #endif
167
168 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
169 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
170
171 if (events)
172 fd_event (EV_A_ fd, events);
173 }
174 }
175
176#else
177
178 {
179 int word, bit;
180 for (word = vec_max; word--; )
181 {
182 fd_mask word_r = ((fd_mask *)vec_ro) [word];
183 fd_mask word_w = ((fd_mask *)vec_wo) [word];
184
185 if (word_r || word_w)
186 for (bit = NFDBITS; bit--; )
187 {
188 fd_mask mask = 1UL << bit;
189 int events = 0;
190
191 events |= word_r & mask ? EV_READ : 0;
192 events |= word_w & mask ? EV_WRITE : 0;
193
194 if (events)
195 fd_event (EV_A_ word * NFDBITS + bit, events);
196 }
197 }
198 }
199
200#endif
122} 201}
123 202
124static int 203static int
125select_init (EV_P_ int flags) 204select_init (EV_P_ int flags)
126{ 205{
127 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 206 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
128 method_modify = select_modify; 207 method_modify = select_modify;
129 method_poll = select_poll; 208 method_poll = select_poll;
130 209
210#if EV_SELECT_USE_FD_SET
211 vec_max = FD_SETSIZE / 32;
212 vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri);
213 vec_ro = ev_malloc (sizeof (fd_set));
214 vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi);
215 vec_wo = ev_malloc (sizeof (fd_set));
216#else
217 vec_max = 0;
218 vec_ri = 0;
219 vec_ri = 0;
220 vec_wo = 0;
221 vec_wo = 0;
222#endif
223
131 return EVMETHOD_SELECT; 224 return EVBACKEND_SELECT;
132} 225}
133 226
227static void
228select_destroy (EV_P)
229{
230 ev_free (vec_ri);
231 ev_free (vec_ro);
232 ev_free (vec_wi);
233 ev_free (vec_wo);
234}
235
236

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