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      You should have received a copy of the GNU Affero General Public License
  16      along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18      SPDX-License-Identifier: AGPL3.0-or-later
  19 */
  20
  21 /**
  22  * @file util/speedup.c
  23  * @author Matthias Wachs
  24  * @brief functions to speedup peer execution by manipulation system time
  25  */
  26 #include "platform.h"
  27 #include "gnunet_util_lib.h"
  28 #include "speedup.h"
  29
  30 #define LOG(kind,...) GNUNET_log_from (kind, "util-speedup", __VA_ARGS__)
  31
  32
  33 static struct GNUNET_TIME_Relative interval;
  34
  35 static struct GNUNET_TIME_Relative delta;
  36
  37 static struct GNUNET_SCHEDULER_Task *speedup_task;
  38
  39
  40 static void
  41 do_speedup (void *cls)
  42 {
  43   static long long current_offset;
  44
  45   (void) cls;
  46   speedup_task = NULL;
  47   current_offset += delta.rel_value_us;
  48   GNUNET_TIME_set_offset (current_offset);
  49   LOG (GNUNET_ERROR_TYPE_DEBUG,
  50        "Speeding up execution time by %s\n",
  51        GNUNET_STRINGS_relative_time_to_string (delta, GNUNET_NO));
  52   speedup_task = GNUNET_SCHEDULER_add_delayed (interval,
  53                                                &do_speedup,
  54                                                NULL);
  55 }
  56
  57
  58 /**
  59  * Start task that may speed up our system clock artificially
  60  *
  61  * @param cfg configuration to use
  62  * @return #GNUNET_OK on success, #GNUNET_SYSERR if the speedup was not configured
  63  */
  64 int
  65 GNUNET_SPEEDUP_start_ (const struct GNUNET_CONFIGURATION_Handle *cfg)
  66 {
  67   GNUNET_assert (NULL == speedup_task);
  68   if (GNUNET_OK !=
  69       GNUNET_CONFIGURATION_get_value_time (cfg,
  70                                            "testing",
  71                                            "SPEEDUP_INTERVAL",
  72                                            &interval))
  73     return GNUNET_SYSERR;
  74   if (GNUNET_OK !=
  75       GNUNET_CONFIGURATION_get_value_time (cfg,
  76                                            "testing",
  77                                            "SPEEDUP_DELTA",
  78                                            &delta))
  79     return GNUNET_SYSERR;
  80
  81   if ( (0 == interval.rel_value_us) ||
  82        (0 == delta.rel_value_us) )
  83   {
  84     LOG (GNUNET_ERROR_TYPE_DEBUG,
  85          "Speed up disabled\n");
  86     return GNUNET_OK;
  87   }
  88   LOG (GNUNET_ERROR_TYPE_DEBUG,
  89        "Speed up execution by %s\n",
  90        GNUNET_STRINGS_relative_time_to_string (delta, GNUNET_NO));
  91   LOG (GNUNET_ERROR_TYPE_DEBUG,
  92        "Speed up executed every %s\n",
  93        GNUNET_STRINGS_relative_time_to_string (interval, GNUNET_NO));
  94   speedup_task = GNUNET_SCHEDULER_add_now_with_lifeness (GNUNET_NO,
  95                                                          &do_speedup,
  96                                                          NULL);
  97   return GNUNET_OK;
  98 }
  99
 100
 101 /**
 102  * Stop tasks that modify clock behavior.
 103  */
 104 void
 105 GNUNET_SPEEDUP_stop_ ()
 106 {
 107   if (NULL != speedup_task)
 108   {
 109     GNUNET_SCHEDULER_cancel (speedup_task);
 110     speedup_task = NULL;
 111   }
 112   if ( (0 != interval.rel_value_us) &&
 113        (0 != delta.rel_value_us) )
 114     LOG (GNUNET_ERROR_TYPE_DEBUG,
 115          "Stopped execution speed up\n");
 116 }
 117
 118 /* end of speedup.c */