src/util/speedup.c

   1 /*
   2      This file is part of GNUnet.
   3      Copyright (C) 2011-2013 GNUnet e.V.
   4
   5      GNUnet is free software: you can redistribute it and/or modify it
   6      under the terms of the GNU Affero General Public License as published
   7      by the Free Software Foundation, either version 3 of the License,
   8      or (at your option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      Affero General Public License for more details.
  14 */
  15
  16 /**
  17  * @file util/speedup.c
  18  * @author Matthias Wachs
  19  * @brief functions to speedup peer execution by manipulation system time
  20  */
  21 #include "platform.h"
  22 #include "gnunet_util_lib.h"
  23 #include "speedup.h"
  24
  25 #define LOG(kind,...) GNUNET_log_from (kind, "util-speedup", __VA_ARGS__)
  26
  27
  28 static struct GNUNET_TIME_Relative interval;
  29
  30 static struct GNUNET_TIME_Relative delta;
  31
  32 static struct GNUNET_SCHEDULER_Task *speedup_task;
  33
  34
  35 static void
  36 do_speedup (void *cls)
  37 {
  38   static long long current_offset;
  39
  40   (void) cls;
  41   speedup_task = NULL;
  42   current_offset += delta.rel_value_us;
  43   GNUNET_TIME_set_offset (current_offset);
  44   LOG (GNUNET_ERROR_TYPE_DEBUG,
  45        "Speeding up execution time by %s\n",
  46        GNUNET_STRINGS_relative_time_to_string (delta, GNUNET_NO));
  47   speedup_task = GNUNET_SCHEDULER_add_delayed (interval,
  48                                                &do_speedup,
  49                                                NULL);
  50 }
  51
  52
  53 /**
  54  * Start task that may speed up our system clock artificially
  55  *
  56  * @param cfg configuration to use
  57  * @return #GNUNET_OK on success, #GNUNET_SYSERR if the speedup was not configured
  58  */
  59 int
  60 GNUNET_SPEEDUP_start_ (const struct GNUNET_CONFIGURATION_Handle *cfg)
  61 {
  62   GNUNET_assert (NULL == speedup_task);
  63   if (GNUNET_OK !=
  64       GNUNET_CONFIGURATION_get_value_time (cfg,
  65                                            "testing",
  66                                            "SPEEDUP_INTERVAL",
  67                                            &interval))
  68     return GNUNET_SYSERR;
  69   if (GNUNET_OK !=
  70       GNUNET_CONFIGURATION_get_value_time (cfg,
  71                                            "testing",
  72                                            "SPEEDUP_DELTA",
  73                                            &delta))
  74     return GNUNET_SYSERR;
  75
  76   if ( (0 == interval.rel_value_us) ||
  77        (0 == delta.rel_value_us) )
  78   {
  79     LOG (GNUNET_ERROR_TYPE_DEBUG,
  80          "Speed up disabled\n");
  81     return GNUNET_OK;
  82   }
  83   LOG (GNUNET_ERROR_TYPE_DEBUG,
  84        "Speed up execution by %s\n",
  85        GNUNET_STRINGS_relative_time_to_string (delta, GNUNET_NO));
  86   LOG (GNUNET_ERROR_TYPE_DEBUG,
  87        "Speed up executed every %s\n",
  88        GNUNET_STRINGS_relative_time_to_string (interval, GNUNET_NO));
  89   speedup_task = GNUNET_SCHEDULER_add_now_with_lifeness (GNUNET_NO,
  90                                                          &do_speedup,
  91                                                          NULL);
  92   return GNUNET_OK;
  93 }
  94
  95
  96 /**
  97  * Stop tasks that modify clock behavior.
  98  */
  99 void
 100 GNUNET_SPEEDUP_stop_ ()
 101 {
 102   if (NULL != speedup_task)
 103   {
 104     GNUNET_SCHEDULER_cancel (speedup_task);
 105     speedup_task = NULL;
 106   }
 107   if ( (0 != interval.rel_value_us) &&
 108        (0 != delta.rel_value_us) )
 109     LOG (GNUNET_ERROR_TYPE_DEBUG,
 110          "Stopped execution speed up\n");
 111 }
 112
 113 /* end of speedup.c */