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git.proxmox.com Git - mirror_frr.git/blob - tests/lib/test_heavy_thread.c
2 * This file is part of Quagga.
4 * Quagga is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2, or (at your option) any
9 * Quagga is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; see the file COPYING; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 /* This programme shows the effects of 'heavy' long-running functions
20 * on the cooperative threading model, as demonstrated by heavy.c, and how
21 * they can be mitigated using a background thread.
23 * Run it with a config file containing 'password whatever', telnet to it
24 * (it defaults to port 4000) and enter the 'clear foo string' command.
25 * then type whatever and observe that, unlike heavy.c, the vty interface
39 extern struct thread_master
*master
;
41 enum { ITERS_FIRST
= 0,
54 static void slow_func(struct vty
*vty
, const char *str
, const int i
)
59 for (j
= 0; j
< 300; j
++)
62 if ((i
% ITERS_LATER
) == 0)
63 printf("%s: %d, temporary error, save this somehow and do it later..\n",
66 if ((i
% ITERS_ERR
) == 0)
67 printf("%s: hard error\n", __func__
);
69 if ((i
% ITERS_PRINT
) == 0)
70 printf("%s did %d, x = %g\n", str
, i
, x
);
73 static int clear_something(struct thread
*thread
)
75 struct work_state
*ws
= THREAD_ARG(thread
);
77 /* this could be like iterating through 150k of route_table
78 * or worse, iterating through a list of peers, to bgp_stop them with
79 * each having 150k route tables to process...
81 while (ws
->i
< ITERS_MAX
) {
82 slow_func(ws
->vty
, ws
->str
, ws
->i
);
84 if (thread_should_yield(thread
)) {
85 thread_add_timer_msec(master
, clear_something
, ws
, 0,
92 XFREE(MTYPE_TMP
, ws
->str
);
101 "arbitrary string\n")
104 struct work_state
*ws
;
107 vty_out(vty
, "%% string argument required\n");
111 str
= argv_concat(argv
, argc
, 0);
113 ws
= XMALLOC(MTYPE_TMP
, sizeof(*ws
));
115 ws
->str
= XSTRDUP(MTYPE_TMP
, str
);
120 thread_add_timer_msec(master
, clear_something
, ws
, 0, NULL
);
127 install_element(VIEW_NODE
, &clear_foo_cmd
);