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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 1.16 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);
49 47
48 if (oev == nev)
49 return;
50
50 if (vec_max < (fd >> 5) + 1) 51 if (vec_max < (fd >> 5) + 1)
51 { 52 {
52 vec_max = (fd >> 5) + 1; 53 int new_max = (fd >> 5) + 1;
53 54
54 vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); 55 vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4);
55 vec_ro = (unsigned char *)realloc (vec_ro, vec_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, vec_max * 4); 57 vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4);
57 vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ 58 vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */
59
60 for (; vec_max < new_max; ++vec_max)
61 ((uint32_t *)vec_ri)[vec_max] =
62 ((uint32_t *)vec_wi)[vec_max] = 0;
58 } 63 }
59 64
60 vec_ri [offs] |= mask; 65 vec_ri [offs] |= mask;
61 if (!(nev & EV_READ)) 66 if (!(nev & EV_READ))
62 vec_ri [offs] &= ~mask; 67 vec_ri [offs] &= ~mask;
… …
64 vec_wi [offs] |= mask; 69 vec_wi [offs] |= mask;
65 if (!(nev & EV_WRITE)) 70 if (!(nev & EV_WRITE))
66 vec_wi [offs] &= ~mask; 71 vec_wi [offs] &= ~mask;
67} 72}
68 73
74static void
69static void select_poll (ev_tstamp timeout) 75select_poll (EV_P_ ev_tstamp timeout)
70{ 76{
77 int word, offs;
71 struct timeval tv; 78 struct timeval tv;
72 int res; 79 int res;
73 80
74 memcpy (vec_ro, vec_ri, vec_max * 4); 81 memcpy (vec_ro, vec_ri, vec_max * 4);
75 memcpy (vec_wo, vec_wi, vec_max * 4); 82 memcpy (vec_wo, vec_wi, vec_max * 4);
… …
77 tv.tv_sec = (long)timeout; 84 tv.tv_sec = (long)timeout;
78 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); 85 tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6);
79 86
80 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);
81 88
82 if (res > 0) 89 if (res < 0)
83 { 90 {
84 int word, offs; 91 if (errno == EBADF)
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");
85 97
86 for (word = vec_max; word--; ) 98 return;
87 { 99 }
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;
95 100
96 if (byte_r | byte_w) 101 for (word = vec_max; word--; )
97 for (bit = 8; bit--; ) 102 {
98 { 103 if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word])
99 int events = 0; 104 for (offs = 4; offs--; )
100 events |= byte_r & (1 << bit) ? EV_READ : 0; 105 {
101 events |= byte_w & (1 << bit) ? EV_WRITE : 0; 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;
102 110
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
103 if (events) 118 if (events)
104 fd_event (idx * 8 + bit, events); 119 fd_event (EV_A_ idx * 8 + bit, events);
105 }
106 } 120 }
107 } 121 }
108 } 122 }
109} 123}
110 124
125static int
111void select_init (int flags) 126select_init (EV_P_ int flags)
112{ 127{
113 ev_method = EVMETHOD_SELECT;
114 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 */
115 method_modify = select_modify; 129 method_modify = select_modify;
116 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);
117} 148}
118 149
119 150

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