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