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