1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
/*
* This file is part of the XForms library package.
*
* XForms is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1, or
* (at your option) any later version.
*
* XForms is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with XForms. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file timeout.c
*
* This file is part of the XForms library package.
* Copyright (c) 1996-2002 T.C. Zhao and Mark Overmars
* All rights reserved.
*
* Check timeout
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "include/forms.h"
#include "flinternal.h"
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include <sys/types.h>
long msec0 = 0;
/***************************************
***************************************/
int
fl_add_timeout( long msec,
FL_TIMEOUT_CALLBACK callback,
void * data )
{
FLI_TIMEOUT_REC *rec;
static int id = 1;
rec = fl_malloc( sizeof *rec );
fl_gettime( &rec->start_sec, &rec->start_usec );
rec->id = id;
rec->ms_to_wait = FL_max( msec, 0 );
rec->callback = callback;
rec->data = data;
rec->prev = NULL;
/* Make it the start of the (doubly) linked list */
rec->next = fli_context->timeout_rec;
if ( fli_context->timeout_rec )
fli_context->timeout_rec->prev = rec;
fli_context->timeout_rec = rec;
/* Deal with wrap around of IDs- rather unlikely to happen but if it does
it's not a 100% safe way to do it, we can only bet on the chance that
the timeouts with the re-used numbers have expired a long time ago... */
if ( id++ <= 0 )
id = 1;
return rec->id;
}
/***************************************
* Internal function for remving a timeout - remove
* it from the (doubly) linked list and free memory
***************************************/
static void
remove_timeout( FLI_TIMEOUT_REC * rec )
{
if ( rec == fli_context->timeout_rec )
{
fli_context->timeout_rec = rec->next;
if ( rec->next )
fli_context->timeout_rec->prev = NULL;
}
else
{
rec->prev->next = rec->next;
if ( rec->next )
rec->next->prev = rec->prev;
}
fl_free( rec );
}
/***************************************
* Public function for removing a timeout
***************************************/
void
fl_remove_timeout( int id )
{
FLI_TIMEOUT_REC *rec = fli_context->timeout_rec;
while ( rec && rec->id != id )
rec = rec->next;
if ( rec )
remove_timeout( rec );
else
M_err( "fl_remove_timeout", "ID %d not found", id );
}
/***************************************
* Function that periodically gets called to deal with expired
* timeouts, invoking their handlers and removing them. Via the
* argument the time until the next timeout expires gets returned
* (if this is earlier than the original value).
***************************************/
void
fli_handle_timeouts( long * msec )
{
FLI_TIMEOUT_REC *rec,
*next;
long sec = 0,
usec,
elapsed,
diff;
if ( ! fli_context->timeout_rec )
return;
fl_gettime( &sec, &usec );
/* Loop over all candidates, dealing with those that expired and
removing them, while also keeping looking for the time the next
one is going to expire */
for ( rec = fli_context->timeout_rec; rec; rec = next )
{
next = rec->next;
elapsed = 1000 * ( sec - rec->start_sec )
+ ( usec - rec->start_usec ) / 1000;
diff = rec->ms_to_wait - elapsed;
if ( diff <= 0 )
{
if ( rec->callback )
{
rec->callback( rec->id, rec->data );
fl_gettime( &sec, &usec );
}
remove_timeout( rec );
}
else
*msec = FL_min( *msec, diff );
}
}
/***************************************
***************************************/
void
fli_remove_all_timeouts( void )
{
while ( fli_context->timeout_rec )
fl_remove_timeout( fli_context->timeout_rec->id );
}
/*
* Local variables:
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|