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/*
This file is part of GNUnet.
Copyright (C) 2011-2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file util/speedup.c
* @author Matthias Wachs
* @brief functions to speedup peer execution by manipulation system time
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "speedup.h"
#define LOG(kind,...) GNUNET_log_from (kind, "util-speedup", __VA_ARGS__)
static struct GNUNET_TIME_Relative interval;
static struct GNUNET_TIME_Relative delta;
static struct GNUNET_SCHEDULER_Task *speedup_task;
static void
do_speedup (void *cls)
{
static long long current_offset;
(void) cls;
speedup_task = NULL;
current_offset += delta.rel_value_us;
GNUNET_TIME_set_offset (current_offset);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Speeding up execution time by %s\n",
GNUNET_STRINGS_relative_time_to_string (delta, GNUNET_NO));
speedup_task = GNUNET_SCHEDULER_add_delayed (interval,
&do_speedup,
NULL);
}
/**
* Start task that may speed up our system clock artificially
*
* @param cfg configuration to use
* @return #GNUNET_OK on success, #GNUNET_SYSERR if the speedup was not configured
*/
int
GNUNET_SPEEDUP_start_ (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
GNUNET_assert (NULL == speedup_task);
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_time (cfg,
"testing",
"SPEEDUP_INTERVAL",
&interval))
return GNUNET_SYSERR;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_time (cfg,
"testing",
"SPEEDUP_DELTA",
&delta))
return GNUNET_SYSERR;
if ( (0 == interval.rel_value_us) ||
(0 == delta.rel_value_us) )
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Speed up disabled\n");
return GNUNET_OK;
}
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Speed up execution by %s\n",
GNUNET_STRINGS_relative_time_to_string (delta, GNUNET_NO));
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Speed up executed every %s\n",
GNUNET_STRINGS_relative_time_to_string (interval, GNUNET_NO));
speedup_task = GNUNET_SCHEDULER_add_now_with_lifeness (GNUNET_NO,
&do_speedup,
NULL);
return GNUNET_OK;
}
/**
* Stop tasks that modify clock behavior.
*/
void
GNUNET_SPEEDUP_stop_ ()
{
if (NULL != speedup_task)
{
GNUNET_SCHEDULER_cancel (speedup_task);
speedup_task = NULL;
}
if ( (0 != interval.rel_value_us) &&
(0 != delta.rel_value_us) )
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Stopped execution speed up\n");
}
/* end of speedup.c */
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