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Comparing libev/ev_select.c (file contents):
Revision 1.5 by root, Wed Oct 31 17:55:55 2007 UTC vs.
Revision 1.16 by root, Tue Nov 6 13:17:55 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#ifdef WIN32
34typedef unsigned int uint32_t;
35#else
36#include <sys/select.h> 36# include <sys/select.h>
37# include <inttypes.h>
38#endif
37 39
38#include <string.h> 40#include <string.h>
39#include <inttypes.h>
40
41static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
42static int vec_max;
43 41
44static void 42static void
45select_modify (int fd, int oev, int nev) 43select_modify (EV_P_ int fd, int oev, int nev)
46{ 44{
47 int offs = fd >> 3; 45 int offs = fd >> 3;
48 int mask = 1 << (fd & 7); 46 int mask = 1 << (fd & 7);
47
48 if (oev == nev)
49 return;
49 50
50 if (vec_max < (fd >> 5) + 1) 51 if (vec_max < (fd >> 5) + 1)
51 { 52 {
52 int new_max = (fd >> 5) + 1; 53 int new_max = (fd >> 5) + 1;
53 54
54 vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4); 55 vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
55 vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */ 56 vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */
56 vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4); 57 vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
57 vec_wo = (unsigned char *)realloc (vec_wo, new_max * 4); /* could free/malloc */ 58 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
58 59
59 for (; vec_max < new_max; ++vec_max) 60 for (; vec_max < new_max; ++vec_max)
60 ((uint32_t *)vec_ri)[vec_max] = 61 ((uint32_t *)vec_ri)[vec_max] =
61 ((uint32_t *)vec_wi)[vec_max] = 0; 62 ((uint32_t *)vec_wi)[vec_max] = 0;
62 } 63 }
… …
68 vec_wi [offs] |= mask; 69 vec_wi [offs] |= mask;
69 if (!(nev & EV_WRITE)) 70 if (!(nev & EV_WRITE))
70 vec_wi [offs] &= ~mask; 71 vec_wi [offs] &= ~mask;
71} 72}
72 73
74static void
73static void select_poll (ev_tstamp timeout) 75select_poll (EV_P_ ev_tstamp timeout)
74{ 76{
77 int word, offs;
75 struct timeval tv; 78 struct timeval tv;
76 int res; 79 int res;
77 80
78 memcpy (vec_ro, vec_ri, vec_max * 4); 81 memcpy (vec_ro, vec_ri, vec_max * 4);
79 memcpy (vec_wo, vec_wi, vec_max * 4); 82 memcpy (vec_wo, vec_wi, vec_max * 4);
… …
81 tv.tv_sec = (long)timeout; 84 tv.tv_sec = (long)timeout;
82 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 85 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
83 86
84 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); 87 res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv);
85 88
86 if (res > 0) 89 if (res < 0)
87 {
88 int word, offs;
89
90 for (word = vec_max; word--; )
91 {
92 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
93 for (offs = 4; offs--; )
94 {
95 int idx = word * 4 + offs;
96 unsigned char byte_r = vec_ro [idx];
97 unsigned char byte_w = vec_wo [idx];
98 int bit;
99
100 if (byte_r | byte_w)
101 for (bit = 8; bit--; )
102 {
103 int events = 0;
104 events |= byte_r & (1 << bit) ? EV_READ : 0;
105 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
106
107 if (events)
108 fd_event (idx * 8 + bit, events);
109 }
110 }
111 }
112 }
113 else if (res < 0)
114 { 90 {
115 if (errno == EBADF) 91 if (errno == EBADF)
116 fd_recheck (); 92 fd_ebadf (EV_A);
93 else if (errno == ENOMEM && !syserr_cb)
94 fd_enomem (EV_A);
95 else if (errno != EINTR)
96 syserr ("(libev) select");
97
98 return;
99 }
100
101 for (word = vec_max; word--; )
102 {
103 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
104 for (offs = 4; offs--; )
105 {
106 int idx = word * 4 + offs;
107 unsigned char byte_r = vec_ro [idx];
108 unsigned char byte_w = vec_wo [idx];
109 int bit;
110
111 if (byte_r | byte_w)
112 for (bit = 8; bit--; )
113 {
114 int events = 0;
115 events |= byte_r & (1 << bit) ? EV_READ : 0;
116 events |= byte_w & (1 << bit) ? EV_WRITE : 0;
117
118 if (events)
119 fd_event (EV_A_ idx * 8 + bit, events);
120 }
121 }
117 } 122 }
118} 123}
119 124
125static int
120void select_init (int flags) 126select_init (EV_P_ int flags)
121{ 127{
122 ev_method = EVMETHOD_SELECT;
123 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 128 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
124 method_modify = select_modify; 129 method_modify = select_modify;
125 method_poll = select_poll; 130 method_poll = select_poll;
131
132 vec_max = 0;
133 vec_ri = 0;
134 vec_ri = 0;
135 vec_wo = 0;
136 vec_wo = 0;
137
138 return EVMETHOD_SELECT;
139}
140
141static void
142select_destroy (EV_P)
143{
144 ev_free (vec_ri);
145 ev_free (vec_ro);
146 ev_free (vec_wi);
147 ev_free (vec_wo);
126} 148}
127 149
128 150

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