tests/lib/test_heavy.c

   1 /*
   2  * $Id: heavy.c,v 1.3 2005/04/25 16:42:24 paul Exp $
   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 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
  19  */
  20
  21 /* This programme shows the effects of 'heavy' long-running functions
  22  * on the cooperative threading model.
  23  *
  24  * Run it with a config file containing 'password whatever', telnet to it
  25  * (it defaults to port 4000) and enter the 'clear foo string' command.
  26  * then type whatever and observe that the vty interface is unresponsive
  27  * for quite a period of time, due to the clear_something command
  28  * taking a very long time to complete.
  29  */
  30 #include <zebra.h>
  31
  32 #include "thread.h"
  33 #include "vty.h"
  34 #include "command.h"
  35 #include "memory.h"
  36 #include <math.h>
  37
  38 #include "tests.h"
  39
  40 enum
  41 {
  42   ITERS_FIRST = 0,
  43   ITERS_ERR = 100,
  44   ITERS_LATER = 400,
  45   ITERS_PRINT = 10,
  46   ITERS_MAX = 1000,
  47 };
  48
  49 static void
  50 slow_func (struct vty *vty, const char *str, const int i)
  51 {
  52   double x = 1;
  53   int j;
  54
  55   for (j = 0; j < 300; j++)
  56     x += sin(x)*j;
  57
  58   if ((i % ITERS_LATER) == 0)
  59     printf ("%s: %d, temporary error, save this somehow and do it later..\n",
  60             __func__, i);
  61
  62   if ((i % ITERS_ERR) == 0)
  63     printf ("%s: hard error\n", __func__);
  64
  65   if ((i % ITERS_PRINT) == 0)
  66     printf ("%s did %d, x = %g%s", str, i, x, VTY_NEWLINE);
  67 }
  68
  69 static void
  70 clear_something (struct vty *vty, const char *str)
  71 {
  72   int i;
  73
  74   /* this could be like iterating through 150k of route_table
  75    * or worse, iterating through a list of peers, to bgp_stop them with
  76    * each having 150k route tables to process...
  77    */
  78   for (i = ITERS_FIRST; i < ITERS_MAX; i++)
  79     slow_func (vty, str, i);
  80 }
  81
  82 DEFUN (clear_foo,
  83        clear_foo_cmd,
  84        "clear foo LINE...",
  85        "clear command\n"
  86        "arbitrary string\n")
  87 {
  88   char *str;
  89   if (!argc)
  90     {
  91       vty_out (vty, "%% string argument required%s", VTY_NEWLINE);
  92       return CMD_WARNING;
  93     }
  94
  95   str = argv_concat (argv, argc, 0);
  96
  97   clear_something (vty, str);
  98   XFREE (MTYPE_TMP, str);
  99   return CMD_SUCCESS;
 100 }
 101
 102 static void
 103 slow_vty_init()
 104 {
 105   install_element (VIEW_NODE, &clear_foo_cmd);
 106 }
 107
 108 void
 109 test_init()
 110 {
 111   slow_vty_init();
 112 }