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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 1.25 by root, Sun Dec 9 03:41:44 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 */ 32#ifndef _WIN32
31#include <sys/time.h>
32#include <sys/types.h>
33#include <unistd.h>
34
35/* for unix systems */ 33/* for unix systems */
36#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)
59#endif
37 60
38#include <string.h> 61#include <string.h>
39#include <inttypes.h>
40
41static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
42static int vec_max;
43 62
44static void 63static void
45select_modify (int fd, int oev, int nev) 64select_modify (EV_P_ int fd, int oev, int nev)
46{ 65{
47 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;
48 int mask = 1 << (fd & 7); 91 int mask = 1UL << (fd % NFDBITS);
49 92
50 if (vec_max < (fd >> 5) + 1) 93 if (expect_false (vec_max < word + 1))
51 { 94 {
52 vec_max = (fd >> 5) + 1; 95 int new_max = word + 1;
53 96
54 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 97 vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES);
55 vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ 98 vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */
56 vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); 99 vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES);
57 vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ 100 vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */
101
102 for (; vec_max < new_max; ++vec_max)
103 ((fd_mask *)vec_ri)[vec_max] =
104 ((fd_mask *)vec_wi)[vec_max] = 0;
58 } 105 }
59 106
60 vec_ri [offs] |= mask; 107 ((fd_mask *)vec_ri) [word] |= mask;
61 if (!(nev & EV_READ)) 108 if (!(nev & EV_READ))
62 vec_ri [offs] &= ~mask; 109 ((fd_mask *)vec_ri) [word] &= ~mask;
63 110
64 vec_wi [offs] |= mask; 111 ((fd_mask *)vec_wi) [word] |= mask;
65 if (!(nev & EV_WRITE)) 112 if (!(nev & EV_WRITE))
66 vec_wi [offs] &= ~mask; 113 ((fd_mask *)vec_wi) [word] &= ~mask;
114#endif
115 }
67} 116}
68 117
118static void
69static void select_poll (ev_tstamp timeout) 119select_poll (EV_P_ ev_tstamp timeout)
70{ 120{
71 struct timeval tv; 121 struct timeval tv;
72 int res; 122 int res;
73 123
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
74 memcpy (vec_ro, vec_ri, vec_max * 4); 128 memcpy (vec_ro, vec_ri, vec_max * NFDBYTES);
75 memcpy (vec_wo, vec_wi, vec_max * 4); 129 memcpy (vec_wo, vec_wi, vec_max * NFDBYTES);
130#endif
76 131
77 tv.tv_sec = (long)timeout; 132 tv.tv_sec = (long)timeout;
78 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 133 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
79 134
80 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);
81 136
82 if (res > 0) 137 if (expect_false (res < 0))
83 { 138 {
84 int word, offs; 139 #if EV_SELECT_IS_WINSOCKET
140 errno = WSAGetLastError ();
141 #endif
85 142
86 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)
87 { 160 {
88 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
89 for (offs = 4; offs--; )
90 {
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; 161 int events = 0;
100 events |= byte_r & (1 << bit) ? EV_READ : 0; 162 #if EV_SELECT_IS_WINSOCKET
101 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 163 SOCKET handle = anfds [fd].handle;
164 #else
165 int handle = fd;
166 #endif
102 167
103 if (events) 168 if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ;
104 fd_event (idx * 8 + bit, events); 169 if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE;
105 } 170
106 } 171 if (expect_true (events))
172 fd_event (EV_A_ fd, events);
107 } 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 (expect_true (events))
195 fd_event (EV_A_ word * NFDBITS + bit, events);
196 }
108 } 197 }
109} 198 }
110 199
200#endif
201}
202
203int inline_size
111void select_init (int flags) 204select_init (EV_P_ int flags)
112{ 205{
113 ev_method = EVMETHOD_SELECT;
114 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 206 backend_fudge = 0; /* needed to compensate for select returning early, very conservative */
115 method_modify = select_modify; 207 backend_modify = select_modify;
116 method_poll = select_poll; 208 backend_poll = select_poll;
117}
118 209
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
119 223
224 return EVBACKEND_SELECT;
225}
226
227void inline_size
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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