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Annotation of embedaddon/quagga/tests/heavy.c, revision 1.1.1.1

1.1       misho       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: }