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acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
864c364d | 2 | /* |
864c364d | 3 | */ |
4 | ||
5 | /* This programme shows the effects of 'heavy' long-running functions | |
6 | * on the cooperative threading model, as demonstrated by heavy.c, and how | |
7 | * they can be mitigated using a background thread. | |
8 | * | |
9 | * Run it with a config file containing 'password whatever', telnet to it | |
10 | * (it defaults to port 4000) and enter the 'clear foo string' command. | |
11 | * then type whatever and observe that, unlike heavy.c, the vty interface | |
12 | * remains responsive. | |
13 | */ | |
14 | #include <zebra.h> | |
15 | #include <math.h> | |
16 | ||
864c364d | 17 | #include "thread.h" |
18 | #include "vty.h" | |
19 | #include "command.h" | |
20 | #include "memory.h" | |
21 | #include "log.h" | |
22 | ||
9fc3f9b3 DL |
23 | #include "tests.h" |
24 | ||
9f3f7a11 | 25 | extern struct thread_master *master; |
864c364d | 26 | |
d62a17ae | 27 | enum { ITERS_FIRST = 0, |
28 | ITERS_ERR = 100, | |
29 | ITERS_LATER = 400, | |
30 | ITERS_PRINT = 10, | |
31 | ITERS_MAX = 1000, | |
864c364d | 32 | }; |
33 | ||
34 | struct work_state { | |
d62a17ae | 35 | struct vty *vty; |
36 | char *str; | |
37 | int i; | |
864c364d | 38 | }; |
39 | ||
d62a17ae | 40 | static void slow_func(struct vty *vty, const char *str, const int i) |
864c364d | 41 | { |
d62a17ae | 42 | double x = 1; |
43 | int j; | |
44 | ||
45 | for (j = 0; j < 300; j++) | |
46 | x += sin(x) * j; | |
47 | ||
48 | if ((i % ITERS_LATER) == 0) | |
49 | printf("%s: %d, temporary error, save this somehow and do it later..\n", | |
50 | __func__, i); | |
51 | ||
52 | if ((i % ITERS_ERR) == 0) | |
53 | printf("%s: hard error\n", __func__); | |
54 | ||
55 | if ((i % ITERS_PRINT) == 0) | |
56 | printf("%s did %d, x = %g\n", str, i, x); | |
864c364d | 57 | } |
58 | ||
cc9f21da | 59 | static void clear_something(struct thread *thread) |
864c364d | 60 | { |
d62a17ae | 61 | struct work_state *ws = THREAD_ARG(thread); |
62 | ||
63 | /* this could be like iterating through 150k of route_table | |
64 | * or worse, iterating through a list of peers, to bgp_stop them with | |
65 | * each having 150k route tables to process... | |
66 | */ | |
67 | while (ws->i < ITERS_MAX) { | |
68 | slow_func(ws->vty, ws->str, ws->i); | |
69 | ws->i++; | |
70 | if (thread_should_yield(thread)) { | |
71 | thread_add_timer_msec(master, clear_something, ws, 0, | |
72 | NULL); | |
cc9f21da | 73 | return; |
d62a17ae | 74 | } |
75 | } | |
76 | ||
77 | /* All done! */ | |
78 | XFREE(MTYPE_TMP, ws->str); | |
79 | XFREE(MTYPE_TMP, ws); | |
864c364d | 80 | } |
81 | ||
864c364d | 82 | DEFUN (clear_foo, |
83 | clear_foo_cmd, | |
e961923c | 84 | "clear foo LINE...", |
864c364d | 85 | "clear command\n" |
86 | "arbitrary string\n") | |
87 | { | |
d62a17ae | 88 | char *str; |
89 | struct work_state *ws; | |
90 | ||
91 | if (!argc) { | |
92 | vty_out(vty, "%% string argument required\n"); | |
93 | return CMD_WARNING; | |
94 | } | |
95 | ||
96 | str = argv_concat(argv, argc, 0); | |
97 | ||
13143701 | 98 | ws = XMALLOC(MTYPE_TMP, sizeof(*ws)); |
d62a17ae | 99 | |
13143701 | 100 | ws->str = XSTRDUP(MTYPE_TMP, str); |
d62a17ae | 101 | |
102 | ws->vty = vty; | |
103 | ws->i = ITERS_FIRST; | |
104 | ||
105 | thread_add_timer_msec(master, clear_something, ws, 0, NULL); | |
106 | ||
107 | return CMD_SUCCESS; | |
864c364d | 108 | } |
109 | ||
4d762f26 | 110 | void test_init(void) |
864c364d | 111 | { |
d62a17ae | 112 | install_element(VIEW_NODE, &clear_foo_cmd); |
864c364d | 113 | } |