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864c364d | 1 | /* |
9f3f7a11 | 2 | * $Id: heavy-thread.c,v 1.2 2005/04/25 16:42:24 paul Exp $ |
864c364d | 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, as demonstrated by heavy.c, and how | |
24 | * they can be mitigated using a background thread. | |
25 | * | |
26 | * Run it with a config file containing 'password whatever', telnet to it | |
27 | * (it defaults to port 4000) and enter the 'clear foo string' command. | |
28 | * then type whatever and observe that, unlike heavy.c, the vty interface | |
29 | * remains responsive. | |
30 | */ | |
31 | #include <zebra.h> | |
32 | #include <math.h> | |
33 | ||
864c364d | 34 | #include "thread.h" |
35 | #include "vty.h" | |
36 | #include "command.h" | |
37 | #include "memory.h" | |
38 | #include "log.h" | |
39 | ||
9fc3f9b3 DL |
40 | #include "tests.h" |
41 | ||
9f3f7a11 | 42 | extern struct thread_master *master; |
864c364d | 43 | |
44 | enum | |
45 | { | |
46 | ITERS_FIRST = 0, | |
47 | ITERS_ERR = 100, | |
48 | ITERS_LATER = 400, | |
49 | ITERS_PRINT = 10, | |
50 | ITERS_MAX = 1000, | |
51 | }; | |
52 | ||
53 | struct work_state { | |
54 | struct vty *vty; | |
55 | char *str; | |
56 | int i; | |
57 | }; | |
58 | ||
59 | static void | |
60 | slow_func (struct vty *vty, const char *str, const int i) | |
61 | { | |
62 | double x = 1; | |
63 | int j; | |
64 | ||
9f3f7a11 | 65 | for (j = 0; j < 300; j++) |
864c364d | 66 | x += sin(x)*j; |
67 | ||
68 | if ((i % ITERS_LATER) == 0) | |
69 | printf ("%s: %d, temporary error, save this somehow and do it later..\n", | |
70 | __func__, i); | |
71 | ||
72 | if ((i % ITERS_ERR) == 0) | |
73 | printf ("%s: hard error\n", __func__); | |
74 | ||
75 | if ((i % ITERS_PRINT) == 0) | |
76 | printf ("%s did %d, x = %g\n", str, i, x); | |
77 | } | |
78 | ||
79 | static int | |
80 | clear_something (struct thread *thread) | |
81 | { | |
82 | struct work_state *ws = THREAD_ARG(thread); | |
83 | ||
84 | /* this could be like iterating through 150k of route_table | |
85 | * or worse, iterating through a list of peers, to bgp_stop them with | |
86 | * each having 150k route tables to process... | |
87 | */ | |
88 | while (ws->i < ITERS_MAX) | |
89 | { | |
90 | slow_func(ws->vty, ws->str, ws->i); | |
91 | ws->i++; | |
92 | if (thread_should_yield(thread)) | |
93 | { | |
94 | thread_add_background(master, clear_something, ws, 0); | |
95 | return 0; | |
96 | } | |
97 | } | |
98 | ||
99 | /* All done! */ | |
100 | XFREE (MTYPE_TMP, ws->str); | |
101 | XFREE (MTYPE_TMP, ws); | |
102 | return 0; | |
103 | } | |
104 | ||
864c364d | 105 | DEFUN (clear_foo, |
106 | clear_foo_cmd, | |
e961923c | 107 | "clear foo LINE...", |
864c364d | 108 | "clear command\n" |
109 | "arbitrary string\n") | |
110 | { | |
111 | char *str; | |
112 | struct work_state *ws; | |
113 | ||
114 | if (!argc) | |
115 | { | |
116 | vty_out (vty, "%% string argument required%s", VTY_NEWLINE); | |
117 | return CMD_WARNING; | |
118 | } | |
119 | ||
120 | str = argv_concat (argv, argc, 0); | |
121 | ||
122 | if ((ws = XMALLOC(MTYPE_TMP, sizeof(*ws))) == NULL) | |
123 | { | |
124 | zlog_err ("%s: unable to allocate work_state", __func__); | |
125 | return CMD_WARNING; | |
126 | } | |
127 | ||
128 | if (!(ws->str = XSTRDUP (MTYPE_TMP, str))) | |
129 | { | |
130 | zlog_err ("%s: unable to xstrdup", __func__); | |
131 | XFREE (MTYPE_TMP, ws); | |
132 | return CMD_WARNING; | |
133 | } | |
134 | ||
135 | ws->vty = vty; | |
136 | ws->i = ITERS_FIRST; | |
137 | ||
138 | thread_add_background(master, clear_something, ws, 0); | |
139 | ||
140 | return CMD_SUCCESS; | |
141 | } | |
142 | ||
9f3f7a11 | 143 | void |
144 | test_init() | |
864c364d | 145 | { |
146 | install_element (VIEW_NODE, &clear_foo_cmd); | |
864c364d | 147 | } |