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Comparing libev/ev_select.c (file contents):
Revision 1.9 by root, Sat Nov 3 09:19:58 2007 UTC vs.
Revision 1.22 by root, Fri Nov 23 05:13:49 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
45static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
46static int vec_max;
47 62
48static void 63static void
49select_modify (int fd, int oev, int nev) 64select_modify (EV_P_ int fd, int oev, int nev)
50{ 65{
51 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;
52 int mask = 1 << (fd & 7); 91 int mask = 1UL << (fd % NFDBITS);
53 92
54 if (vec_max < (fd >> 5) + 1) 93 if (vec_max < word + 1)
55 { 94 {
56 int new_max = (fd >> 5) + 1; 95 int new_max = word + 1;
57 96
58 vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4); 97 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
59 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 */
60 vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4); 99 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
61 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 */
62 101
63 for (; vec_max < new_max; ++vec_max) 102 for (; vec_max < new_max; ++vec_max)
64 ((uint32_t *)vec_ri)[vec_max] = 103 ((fd_mask *)vec_ri)[vec_max] =
65 ((uint32_t *)vec_wi)[vec_max] = 0; 104 ((fd_mask *)vec_wi)[vec_max] = 0;
66 } 105 }
67 106
68 vec_ri [offs] |= mask; 107 ((fd_mask *)vec_ri) [word] |= mask;
69 if (!(nev & EV_READ)) 108 if (!(nev & EV_READ))
70 vec_ri [offs] &= ~mask; 109 ((fd_mask *)vec_ri) [word] &= ~mask;
71 110
72 vec_wi [offs] |= mask; 111 ((fd_mask *)vec_wi) [word] |= mask;
73 if (!(nev & EV_WRITE)) 112 if (!(nev & EV_WRITE))
74 vec_wi [offs] &= ~mask; 113 ((fd_mask *)vec_wi) [word] &= ~mask;
114#endif
115 }
75} 116}
76 117
77static void 118static void
78select_poll (ev_tstamp timeout) 119select_poll (EV_P_ ev_tstamp timeout)
79{ 120{
80 struct timeval tv; 121 struct timeval tv;
81 int res; 122 int res;
82 123
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
83 memcpy (vec_ro, vec_ri, vec_max * 4); 128 memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
84 memcpy (vec_wo, vec_wi, vec_max * 4); 129 memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
130#endif
85 131
86 tv.tv_sec = (long)timeout; 132 tv.tv_sec = (long)timeout;
87 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 133 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
88 134
89 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);
90 136
91 if (res > 0) 137 if (res < 0)
92 { 138 {
93 int word, offs; 139 #if EV_SELECT_IS_WINSOCKET
140 errno = WSAGetLastError ();
141 #endif
94 142
95 for (word = vec_max; word--; ) 143 if (errno == EBADF)
144 fd_ebadf (EV_A);
145 else if (errno == ENOMEM && !syserr_cb)
146 fd_enomem (EV_A);
147 else if (errno != EINTR)
148 syserr ("(libev) select");
149
150 return;
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)
96 { 160 {
97 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
98 for (offs = 4; offs--; )
99 {
100 int idx = word * 4 + offs;
101 unsigned char byte_r = vec_ro [idx];
102 unsigned char byte_w = vec_wo [idx];
103 int bit;
104
105 if (byte_r | byte_w)
106 for (bit = 8; bit--; )
107 {
108 int events = 0; 161 int events = 0;
109 events |= byte_r & (1 << bit) ? EV_READ : 0; 162 #if EV_SELECT_IS_WINSOCKET
110 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 163 SOCKET handle = anfds [fd].handle;
164 #else
165 int handle = fd;
166 #endif
111 167
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
112 if (events) 171 if (events)
113 fd_event (idx * 8 + bit, events); 172 fd_event (EV_A_ fd, events);
114 }
115 }
116 } 173 }
117 } 174 }
118 else if (res < 0) 175
176#else
177
178 {
179 int word, bit;
180 for (word = vec_max; word--; )
119 { 181 {
120 if (errno == EBADF) 182 fd_mask word_r = ((fd_mask *)vec_ro) [word];
121 fd_ebadf (); 183 fd_mask word_w = ((fd_mask *)vec_wo) [word];
122 else if (errno == ENOMEM) 184
123 fd_enomem (); 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 }
124 } 197 }
198 }
199
200#endif
201}
202
203static int
204select_init (EV_P_ int flags)
205{
206 backend_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
207 backend_modify = select_modify;
208 backend_poll = select_poll;
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
224 return EVBACKEND_SELECT;
125} 225}
126 226
127static void 227static void
128select_init (int flags) 228select_destroy (EV_P)
129{ 229{
130 ev_method = EVMETHOD_SELECT; 230 ev_free (vec_ri);
131 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 231 ev_free (vec_ro);
132 method_modify = select_modify; 232 ev_free (vec_wi);
133 method_poll = select_poll; 233 ev_free (vec_wo);
134} 234}
135 235
236

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