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Annotation of embedaddon/quagga/tests/heavy-thread.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * $Id: heavy-thread.c,v 1.2 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, as demonstrated by heavy.c, and how
        !            24:  * they can be mitigated using a background thread.
        !            25:  *
        !            26:  * Run it with a config file containing 'password whatever', telnet to it
        !            27:  * (it defaults to port 4000) and enter the 'clear foo string' command.
        !            28:  * then type whatever and observe that, unlike heavy.c, the vty interface
        !            29:  * remains responsive.
        !            30:  */
        !            31: #include <zebra.h>
        !            32: #include <math.h>
        !            33: 
        !            34: #include "thread.h"
        !            35: #include "vty.h"
        !            36: #include "command.h"
        !            37: #include "memory.h"
        !            38: #include "log.h"
        !            39: 
        !            40: extern struct thread_master *master;
        !            41: 
        !            42: enum
        !            43: {
        !            44:   ITERS_FIRST = 0,
        !            45:   ITERS_ERR = 100,
        !            46:   ITERS_LATER = 400,
        !            47:   ITERS_PRINT = 10,
        !            48:   ITERS_MAX = 1000,
        !            49: };
        !            50: 
        !            51: struct work_state {
        !            52:   struct vty *vty;
        !            53:   char *str;
        !            54:   int i;
        !            55: };
        !            56: 
        !            57: static void
        !            58: slow_func (struct vty *vty, const char *str, const int i)
        !            59: {
        !            60:   double x = 1;
        !            61:   int j;
        !            62:   
        !            63:   for (j = 0; j < 300; j++)
        !            64:     x += sin(x)*j;
        !            65:   
        !            66:   if ((i % ITERS_LATER) == 0)
        !            67:     printf ("%s: %d, temporary error, save this somehow and do it later..\n",
        !            68:             __func__, i);
        !            69:   
        !            70:   if ((i % ITERS_ERR) == 0)
        !            71:     printf ("%s: hard error\n", __func__);
        !            72:   
        !            73:   if ((i % ITERS_PRINT) == 0)
        !            74:     printf ("%s did %d, x = %g\n", str, i, x);
        !            75: }
        !            76: 
        !            77: static int
        !            78: clear_something (struct thread *thread)
        !            79: {
        !            80:   struct work_state *ws = THREAD_ARG(thread);
        !            81:   
        !            82:   /* this could be like iterating through 150k of route_table 
        !            83:    * or worse, iterating through a list of peers, to bgp_stop them with
        !            84:    * each having 150k route tables to process...
        !            85:    */
        !            86:   while (ws->i < ITERS_MAX)
        !            87:     {
        !            88:       slow_func(ws->vty, ws->str, ws->i);
        !            89:       ws->i++;
        !            90:       if (thread_should_yield(thread))
        !            91:         {
        !            92:          thread_add_background(master, clear_something, ws, 0);
        !            93:          return 0;
        !            94:         }
        !            95:     }
        !            96:   
        !            97:   /* All done! */
        !            98:   XFREE (MTYPE_TMP, ws->str);
        !            99:   XFREE (MTYPE_TMP, ws);
        !           100:   return 0;
        !           101: }
        !           102: 
        !           103: DEFUN (clear_foo,
        !           104:        clear_foo_cmd,
        !           105:        "clear foo .LINE",
        !           106:        "clear command\n"
        !           107:        "arbitrary string\n")
        !           108: {
        !           109:   char *str;
        !           110:   struct work_state *ws;
        !           111: 
        !           112:   if (!argc)
        !           113:     {
        !           114:       vty_out (vty, "%% string argument required%s", VTY_NEWLINE);
        !           115:       return CMD_WARNING;
        !           116:     }
        !           117:   
        !           118:   str = argv_concat (argv, argc, 0);
        !           119:   
        !           120:   if ((ws = XMALLOC(MTYPE_TMP, sizeof(*ws))) == NULL)
        !           121:     {
        !           122:       zlog_err ("%s: unable to allocate work_state", __func__);
        !           123:       return CMD_WARNING;
        !           124:     }
        !           125:   
        !           126:   if (!(ws->str = XSTRDUP (MTYPE_TMP, str)))
        !           127:     {
        !           128:       zlog_err ("%s: unable to xstrdup", __func__);
        !           129:       XFREE (MTYPE_TMP, ws);
        !           130:       return CMD_WARNING;
        !           131:     }
        !           132:   
        !           133:   ws->vty = vty;
        !           134:   ws->i = ITERS_FIRST;
        !           135: 
        !           136:   thread_add_background(master, clear_something, ws, 0);
        !           137: 
        !           138:   return CMD_SUCCESS;
        !           139: }
        !           140: 
        !           141: void
        !           142: test_init()
        !           143: {
        !           144:   install_element (VIEW_NODE, &clear_foo_cmd);
        !           145: }