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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 | * | |
896014f4 DL |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
864c364d | 19 | */ |
20 | ||
21 | /* This programme shows the effects of 'heavy' long-running functions | |
22 | * on the cooperative threading model, as demonstrated by heavy.c, and how | |
23 | * they can be mitigated using a background thread. | |
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, unlike heavy.c, the vty interface | |
28 | * remains responsive. | |
29 | */ | |
30 | #include <zebra.h> | |
31 | #include <math.h> | |
32 | ||
864c364d | 33 | #include "thread.h" |
34 | #include "vty.h" | |
35 | #include "command.h" | |
36 | #include "memory.h" | |
37 | #include "log.h" | |
38 | ||
9fc3f9b3 DL |
39 | #include "tests.h" |
40 | ||
9f3f7a11 | 41 | extern struct thread_master *master; |
864c364d | 42 | |
43 | enum | |
44 | { | |
45 | ITERS_FIRST = 0, | |
46 | ITERS_ERR = 100, | |
47 | ITERS_LATER = 400, | |
48 | ITERS_PRINT = 10, | |
49 | ITERS_MAX = 1000, | |
50 | }; | |
51 | ||
52 | struct work_state { | |
53 | struct vty *vty; | |
54 | char *str; | |
55 | int i; | |
56 | }; | |
57 | ||
58 | static void | |
59 | slow_func (struct vty *vty, const char *str, const int i) | |
60 | { | |
61 | double x = 1; | |
62 | int j; | |
63 | ||
9f3f7a11 | 64 | for (j = 0; j < 300; j++) |
864c364d | 65 | x += sin(x)*j; |
66 | ||
67 | if ((i % ITERS_LATER) == 0) | |
68 | printf ("%s: %d, temporary error, save this somehow and do it later..\n", | |
69 | __func__, i); | |
70 | ||
71 | if ((i % ITERS_ERR) == 0) | |
72 | printf ("%s: hard error\n", __func__); | |
73 | ||
74 | if ((i % ITERS_PRINT) == 0) | |
75 | printf ("%s did %d, x = %g\n", str, i, x); | |
76 | } | |
77 | ||
78 | static int | |
79 | clear_something (struct thread *thread) | |
80 | { | |
81 | struct work_state *ws = THREAD_ARG(thread); | |
82 | ||
83 | /* this could be like iterating through 150k of route_table | |
84 | * or worse, iterating through a list of peers, to bgp_stop them with | |
85 | * each having 150k route tables to process... | |
86 | */ | |
87 | while (ws->i < ITERS_MAX) | |
88 | { | |
89 | slow_func(ws->vty, ws->str, ws->i); | |
90 | ws->i++; | |
91 | if (thread_should_yield(thread)) | |
92 | { | |
a587d00b | 93 | thread_add_timer_msec (master, clear_something, ws, 0, NULL); |
864c364d | 94 | return 0; |
95 | } | |
96 | } | |
97 | ||
98 | /* All done! */ | |
99 | XFREE (MTYPE_TMP, ws->str); | |
100 | XFREE (MTYPE_TMP, ws); | |
101 | return 0; | |
102 | } | |
103 | ||
864c364d | 104 | DEFUN (clear_foo, |
105 | clear_foo_cmd, | |
e961923c | 106 | "clear foo LINE...", |
864c364d | 107 | "clear command\n" |
108 | "arbitrary string\n") | |
109 | { | |
110 | char *str; | |
111 | struct work_state *ws; | |
112 | ||
113 | if (!argc) | |
114 | { | |
115 | vty_out (vty, "%% string argument required%s", VTY_NEWLINE); | |
116 | return CMD_WARNING; | |
117 | } | |
118 | ||
119 | str = argv_concat (argv, argc, 0); | |
120 | ||
121 | if ((ws = XMALLOC(MTYPE_TMP, sizeof(*ws))) == NULL) | |
122 | { | |
123 | zlog_err ("%s: unable to allocate work_state", __func__); | |
124 | return CMD_WARNING; | |
125 | } | |
126 | ||
127 | if (!(ws->str = XSTRDUP (MTYPE_TMP, str))) | |
128 | { | |
129 | zlog_err ("%s: unable to xstrdup", __func__); | |
130 | XFREE (MTYPE_TMP, ws); | |
131 | return CMD_WARNING; | |
132 | } | |
133 | ||
134 | ws->vty = vty; | |
135 | ws->i = ITERS_FIRST; | |
136 | ||
a587d00b | 137 | thread_add_timer_msec (master, clear_something, ws, 0, NULL); |
864c364d | 138 | |
139 | return CMD_SUCCESS; | |
140 | } | |
141 | ||
9f3f7a11 | 142 | void |
143 | test_init() | |
864c364d | 144 | { |
145 | install_element (VIEW_NODE, &clear_foo_cmd); | |
864c364d | 146 | } |