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1 | /* | |
2 | * $Id: heavy.c,v 1.3 2005/04/25 16:42:24 paul Exp $ | |
3 | * | |
4 | * This file is part of Quagga. | |
5 | * | |
6 | * Quagga is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * Quagga is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with Quagga; see the file COPYING. If not, write to the Free | |
18 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | * 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | /* This programme shows the effects of 'heavy' long-running functions | |
23 | * on the cooperative threading model. | |
24 | * | |
25 | * Run it with a config file containing 'password whatever', telnet to it | |
26 | * (it defaults to port 4000) and enter the 'clear foo string' command. | |
27 | * then type whatever and observe that the vty interface is unresponsive | |
28 | * for quite a period of time, due to the clear_something command | |
29 | * taking a very long time to complete. | |
30 | */ | |
31 | #include <zebra.h> | |
32 | ||
33 | #include "thread.h" | |
34 | #include "vty.h" | |
35 | #include "command.h" | |
36 | #include "memory.h" | |
37 | #include <math.h> | |
38 | ||
39 | #include "tests.h" | |
40 | ||
41 | enum | |
42 | { | |
43 | ITERS_FIRST = 0, | |
44 | ITERS_ERR = 100, | |
45 | ITERS_LATER = 400, | |
46 | ITERS_PRINT = 10, | |
47 | ITERS_MAX = 1000, | |
48 | }; | |
49 | ||
50 | static void | |
51 | slow_func (struct vty *vty, const char *str, const int i) | |
52 | { | |
53 | double x = 1; | |
54 | int j; | |
55 | ||
56 | for (j = 0; j < 300; j++) | |
57 | x += sin(x)*j; | |
58 | ||
59 | if ((i % ITERS_LATER) == 0) | |
60 | printf ("%s: %d, temporary error, save this somehow and do it later..\n", | |
61 | __func__, i); | |
62 | ||
63 | if ((i % ITERS_ERR) == 0) | |
64 | printf ("%s: hard error\n", __func__); | |
65 | ||
66 | if ((i % ITERS_PRINT) == 0) | |
67 | printf ("%s did %d, x = %g%s", str, i, x, VTY_NEWLINE); | |
68 | } | |
69 | ||
70 | static void | |
71 | clear_something (struct vty *vty, const char *str) | |
72 | { | |
73 | int i; | |
74 | ||
75 | /* this could be like iterating through 150k of route_table | |
76 | * or worse, iterating through a list of peers, to bgp_stop them with | |
77 | * each having 150k route tables to process... | |
78 | */ | |
79 | for (i = ITERS_FIRST; i < ITERS_MAX; i++) | |
80 | slow_func (vty, str, i); | |
81 | } | |
82 | ||
83 | DEFUN (clear_foo, | |
84 | clear_foo_cmd, | |
85 | "clear foo .LINE", | |
86 | "clear command\n" | |
87 | "arbitrary string\n") | |
88 | { | |
89 | char *str; | |
90 | if (!argc) | |
91 | { | |
92 | vty_out (vty, "%% string argument required%s", VTY_NEWLINE); | |
93 | return CMD_WARNING; | |
94 | } | |
95 | ||
96 | str = argv_concat (argv, argc, 0); | |
97 | ||
98 | clear_something (vty, str); | |
99 | XFREE (MTYPE_TMP, str); | |
100 | return CMD_SUCCESS; | |
101 | } | |
102 | ||
103 | static void | |
104 | slow_vty_init() | |
105 | { | |
106 | install_element (VIEW_NODE, &clear_foo_cmd); | |
107 | } | |
108 | ||
109 | void | |
110 | test_init() | |
111 | { | |
112 | slow_vty_init(); | |
113 | } |