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
|
/*
* $Id: heavy.c,v 1.3 2005/04/25 16:42:24 paul Exp $
*
* This file is part of Quagga.
*
* Quagga is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* Quagga 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Quagga; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
/* This programme shows the effects of 'heavy' long-running functions
* on the cooperative threading model.
*
* Run it with a config file containing 'password whatever', telnet to it
* (it defaults to port 4000) and enter the 'clear foo string' command.
* then type whatever and observe that the vty interface is unresponsive
* for quite a period of time, due to the clear_something command
* taking a very long time to complete.
*/
#include <zebra.h>
#include "thread.h"
#include "vty.h"
#include "command.h"
#include "memory.h"
#include <math.h>
enum
{
ITERS_FIRST = 0,
ITERS_ERR = 100,
ITERS_LATER = 400,
ITERS_PRINT = 10,
ITERS_MAX = 1000,
};
static void
slow_func (struct vty *vty, const char *str, const int i)
{
double x = 1;
int j;
for (j = 0; j < 300; j++)
x += sin(x)*j;
if ((i % ITERS_LATER) == 0)
printf ("%s: %d, temporary error, save this somehow and do it later..\n",
__func__, i);
if ((i % ITERS_ERR) == 0)
printf ("%s: hard error\n", __func__);
if ((i % ITERS_PRINT) == 0)
printf ("%s did %d, x = %g%s", str, i, x, VTY_NEWLINE);
}
static void
clear_something (struct vty *vty, const char *str)
{
int i;
/* this could be like iterating through 150k of route_table
* or worse, iterating through a list of peers, to bgp_stop them with
* each having 150k route tables to process...
*/
for (i = ITERS_FIRST; i < ITERS_MAX; i++)
slow_func (vty, str, i);
}
DEFUN (clear_foo,
clear_foo_cmd,
"clear foo .LINE",
"clear command\n"
"arbitrary string\n")
{
char *str;
if (!argc)
{
vty_out (vty, "%% string argument required%s", VTY_NEWLINE);
return CMD_WARNING;
}
str = argv_concat (argv, argc, 0);
clear_something (vty, str);
XFREE (MTYPE_TMP, str);
return CMD_SUCCESS;
}
static void
slow_vty_init()
{
install_element (VIEW_NODE, &clear_foo_cmd);
}
void
test_init()
{
slow_vty_init();
}
|
