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