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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 | ||
9f3f7a11 | 40 | extern struct thread_master *master; |
864c364d | 41 | |
42 | enum | |
43 | { | |
44 | ITERS_FIRST = 0, | |
45 | ITERS_ERR = 100, | |
46 | ITERS_LATER = 400, | |
47 | ITERS_PRINT = 10, | |
48 | ITERS_MAX = 1000, | |
49 | }; | |
50 | ||
51 | struct work_state { | |
52 | struct vty *vty; | |
53 | char *str; | |
54 | int i; | |
55 | }; | |
56 | ||
57 | static void | |
58 | slow_func (struct vty *vty, const char *str, const int i) | |
59 | { | |
60 | double x = 1; | |
61 | int j; | |
62 | ||
9f3f7a11 | 63 | for (j = 0; j < 300; j++) |
864c364d | 64 | x += sin(x)*j; |
65 | ||
66 | if ((i % ITERS_LATER) == 0) | |
67 | printf ("%s: %d, temporary error, save this somehow and do it later..\n", | |
68 | __func__, i); | |
69 | ||
70 | if ((i % ITERS_ERR) == 0) | |
71 | printf ("%s: hard error\n", __func__); | |
72 | ||
73 | if ((i % ITERS_PRINT) == 0) | |
74 | printf ("%s did %d, x = %g\n", str, i, x); | |
75 | } | |
76 | ||
77 | static int | |
78 | clear_something (struct thread *thread) | |
79 | { | |
80 | struct work_state *ws = THREAD_ARG(thread); | |
81 | ||
82 | /* this could be like iterating through 150k of route_table | |
83 | * or worse, iterating through a list of peers, to bgp_stop them with | |
84 | * each having 150k route tables to process... | |
85 | */ | |
86 | while (ws->i < ITERS_MAX) | |
87 | { | |
88 | slow_func(ws->vty, ws->str, ws->i); | |
89 | ws->i++; | |
90 | if (thread_should_yield(thread)) | |
91 | { | |
92 | thread_add_background(master, clear_something, ws, 0); | |
93 | return 0; | |
94 | } | |
95 | } | |
96 | ||
97 | /* All done! */ | |
98 | XFREE (MTYPE_TMP, ws->str); | |
99 | XFREE (MTYPE_TMP, ws); | |
100 | return 0; | |
101 | } | |
102 | ||
864c364d | 103 | DEFUN (clear_foo, |
104 | clear_foo_cmd, | |
105 | "clear foo .LINE", | |
106 | "clear command\n" | |
107 | "arbitrary string\n") | |
108 | { | |
109 | char *str; | |
110 | struct work_state *ws; | |
111 | ||
112 | if (!argc) | |
113 | { | |
114 | vty_out (vty, "%% string argument required%s", VTY_NEWLINE); | |
115 | return CMD_WARNING; | |
116 | } | |
117 | ||
118 | str = argv_concat (argv, argc, 0); | |
119 | ||
120 | if ((ws = XMALLOC(MTYPE_TMP, sizeof(*ws))) == NULL) | |
121 | { | |
122 | zlog_err ("%s: unable to allocate work_state", __func__); | |
123 | return CMD_WARNING; | |
124 | } | |
125 | ||
126 | if (!(ws->str = XSTRDUP (MTYPE_TMP, str))) | |
127 | { | |
128 | zlog_err ("%s: unable to xstrdup", __func__); | |
129 | XFREE (MTYPE_TMP, ws); | |
130 | return CMD_WARNING; | |
131 | } | |
132 | ||
133 | ws->vty = vty; | |
134 | ws->i = ITERS_FIRST; | |
135 | ||
136 | thread_add_background(master, clear_something, ws, 0); | |
137 | ||
138 | return CMD_SUCCESS; | |
139 | } | |
140 | ||
9f3f7a11 | 141 | void |
142 | test_init() | |
864c364d | 143 | { |
144 | install_element (VIEW_NODE, &clear_foo_cmd); | |
864c364d | 145 | } |