ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev_select.c
(Generate patch)

Comparing libev/ev_select.c (file contents):
Revision 1.4 by root, Wed Oct 31 14:44:15 2007 UTC vs.
Revision 1.10 by root, Sat Nov 3 21:58:51 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
… …
31#include <sys/time.h> 33#include <sys/time.h>
32#include <sys/types.h> 34#include <sys/types.h>
33#include <unistd.h> 35#include <unistd.h>
34 36
35/* for unix systems */ 37/* for unix systems */
38#ifndef WIN32
36#include <sys/select.h> 39# include <sys/select.h>
40#endif
37 41
38#include <string.h> 42#include <string.h>
39#include <inttypes.h> 43#include <inttypes.h>
40 44
41static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
42static int vec_max;
43
44static void 45static void
45select_modify (int fd, int oev, int nev) 46select_modify (EV_P_ int fd, int oev, int nev)
46{ 47{
47 int offs = fd >> 3; 48 int offs = fd >> 3;
48 int mask = 1 << (fd & 7); 49 int mask = 1 << (fd & 7);
49 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 *)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 *)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 *)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 *)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{
71 struct timeval tv; 77 struct timeval tv;
72 int res; 78 int res;
73 79
74 memcpy (vec_ro, vec_ri, vec_max * 4); 80 memcpy (vec_ro, vec_ri, vec_max * 4);
… …
104 fd_event (idx * 8 + bit, events); 110 fd_event (idx * 8 + bit, events);
105 } 111 }
106 } 112 }
107 } 113 }
108 } 114 }
115 else if (res < 0)
116 {
117 if (errno == EBADF)
118 fd_ebadf ();
119 else if (errno == ENOMEM)
120 fd_enomem ();
121 }
109} 122}
110 123
124static int
111void select_init (int flags) 125select_init (EV_P_ int flags)
112{ 126{
113 ev_method = EVMETHOD_SELECT;
114 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ 127 method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */
115 method_modify = select_modify; 128 method_modify = select_modify;
116 method_poll = select_poll; 129 method_poll = select_poll;
130
131 return EVMETHOD_SELECT;
117} 132}
118 133
119

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines