/*
This file is part of GNUnet.
Copyright (C) 2001-2013, 2018 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 .
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file util/time.c
* @author Christian Grothoff
* @brief functions for handling time and time arithmetic
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#if __STDC_NO_ATOMICS__
#define ATOMIC
#else
#ifdef HAVE_STDATOMIC_H
#include
#define ATOMIC _Atomic
#else
#define __STDC_NO_ATOMICS__ 1
#define ATOMIC
#endif
#endif
#define LOG(kind, ...) GNUNET_log_from (kind, "util-time", __VA_ARGS__)
/**
* Variable used to simulate clock skew. Used for testing, never in production.
*/
static long long timestamp_offset;
/**
* Set the timestamp offset for this instance.
*
* @param offset the offset to skew the locale time by
*/
void
GNUNET_TIME_set_offset (long long offset)
{
timestamp_offset = offset;
}
/**
* Get the timestamp offset for this instance.
*
* @return the offset we currently skew the locale time by
*/
long long
GNUNET_TIME_get_offset ()
{
return timestamp_offset;
}
/**
* Round a time value so that it is suitable for transmission
* via JSON encodings.
*
* @param at time to round
* @return #GNUNET_OK if time was already rounded, #GNUNET_NO if
* it was just now rounded
*/
int
GNUNET_TIME_round_abs (struct GNUNET_TIME_Absolute *at)
{
if (at->abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
return GNUNET_OK;
if (0 == at->abs_value_us % 1000000)
return GNUNET_OK;
at->abs_value_us -= at->abs_value_us % 1000000;
return GNUNET_NO;
}
/**
* Round a time value so that it is suitable for transmission
* via JSON encodings.
*
* @param rt time to round
* @return #GNUNET_OK if time was already rounded, #GNUNET_NO if
* it was just now rounded
*/
int
GNUNET_TIME_round_rel (struct GNUNET_TIME_Relative *rt)
{
if (rt->rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
return GNUNET_OK;
if (0 == rt->rel_value_us % 1000000)
return GNUNET_OK;
rt->rel_value_us -= rt->rel_value_us % 1000000;
return GNUNET_NO;
}
/**
* Get the current time (works just as "time", just that we use the
* unit of time that the cron-jobs use (and is 64 bit)).
*
* @return the current time
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_get ()
{
struct GNUNET_TIME_Absolute ret;
struct timeval tv;
gettimeofday (&tv, NULL);
ret.abs_value_us = (uint64_t) (((uint64_t) tv.tv_sec * 1000LL * 1000LL)
+ ((uint64_t) tv.tv_usec))
+ timestamp_offset;
return ret;
}
/**
* Return relative time of 0ms.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_get_zero_ ()
{
static struct GNUNET_TIME_Relative zero;
return zero;
}
/**
* Return absolute time of 0ms.
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_get_zero_ ()
{
static struct GNUNET_TIME_Absolute zero;
return zero;
}
/**
* Return relative time of 1us.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_get_unit_ ()
{
static struct GNUNET_TIME_Relative one = { 1 };
return one;
}
/**
* Return relative time of 1ms.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_get_millisecond_ ()
{
static struct GNUNET_TIME_Relative one = { 1000 };
return one;
}
/**
* Return relative time of 1s.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_get_second_ ()
{
static struct GNUNET_TIME_Relative one = { 1000 * 1000LL };
return one;
}
/**
* Return relative time of 1 minute.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_get_minute_ ()
{
static struct GNUNET_TIME_Relative one = { 60 * 1000 * 1000LL };
return one;
}
/**
* Return relative time of 1 hour.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_get_hour_ ()
{
static struct GNUNET_TIME_Relative one = { 60 * 60 * 1000 * 1000LL };
return one;
}
/**
* Return "forever".
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_get_forever_ ()
{
static struct GNUNET_TIME_Relative forever = { UINT64_MAX };
return forever;
}
/**
* Return "forever".
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_get_forever_ ()
{
static struct GNUNET_TIME_Absolute forever = { UINT64_MAX };
return forever;
}
/**
* Convert relative time to an absolute time in the
* future.
*
* @return timestamp that is "rel" in the future, or FOREVER if rel==FOREVER (or if we would overflow)
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_relative_to_absolute (struct GNUNET_TIME_Relative rel)
{
struct GNUNET_TIME_Absolute ret;
if (rel.rel_value_us == UINT64_MAX)
return GNUNET_TIME_UNIT_FOREVER_ABS;
struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
if (rel.rel_value_us + now.abs_value_us < rel.rel_value_us)
{
GNUNET_break (0); /* overflow... */
return GNUNET_TIME_UNIT_FOREVER_ABS;
}
ret.abs_value_us = rel.rel_value_us + now.abs_value_us;
return ret;
}
/**
* Return the minimum of two relative time values.
*
* @param t1 first timestamp
* @param t2 other timestamp
* @return timestamp that is smaller
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_min (struct GNUNET_TIME_Relative t1,
struct GNUNET_TIME_Relative t2)
{
return (t1.rel_value_us < t2.rel_value_us) ? t1 : t2;
}
/**
* Return the maximum of two relative time values.
*
* @param t1 first timestamp
* @param t2 other timestamp
* @return timestamp that is larger
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_max (struct GNUNET_TIME_Relative t1,
struct GNUNET_TIME_Relative t2)
{
return (t1.rel_value_us > t2.rel_value_us) ? t1 : t2;
}
/**
* Return the minimum of two relative time values.
*
* @param t1 first timestamp
* @param t2 other timestamp
* @return timestamp that is smaller
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_min (struct GNUNET_TIME_Absolute t1,
struct GNUNET_TIME_Absolute t2)
{
return (t1.abs_value_us < t2.abs_value_us) ? t1 : t2;
}
/**
* Return the maximum of two relative time values.
*
* @param t1 first timestamp
* @param t2 other timestamp
* @return timestamp that is bigger
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_max (struct GNUNET_TIME_Absolute t1,
struct GNUNET_TIME_Absolute t2)
{
return (t1.abs_value_us > t2.abs_value_us) ? t1 : t2;
}
/**
* Given a timestamp in the future, how much time
* remains until then?
*
* @return future - now, or 0 if now >= future, or FOREVER if future==FOREVER.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_absolute_get_remaining (struct GNUNET_TIME_Absolute future)
{
struct GNUNET_TIME_Relative ret;
if (future.abs_value_us == UINT64_MAX)
return GNUNET_TIME_UNIT_FOREVER_REL;
struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
if (now.abs_value_us > future.abs_value_us)
return GNUNET_TIME_UNIT_ZERO;
ret.rel_value_us = future.abs_value_us - now.abs_value_us;
return ret;
}
/**
* Compute the time difference between the given start and end times.
* Use this function instead of actual subtraction to ensure that
* "FOREVER" and overflows are handled correctly.
*
* @return 0 if start >= end; FOREVER if end==FOREVER; otherwise end - start
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_absolute_get_difference (struct GNUNET_TIME_Absolute start,
struct GNUNET_TIME_Absolute end)
{
struct GNUNET_TIME_Relative ret;
if (end.abs_value_us == UINT64_MAX)
return GNUNET_TIME_UNIT_FOREVER_REL;
if (end.abs_value_us < start.abs_value_us)
return GNUNET_TIME_UNIT_ZERO;
ret.rel_value_us = end.abs_value_us - start.abs_value_us;
return ret;
}
/**
* Get the duration of an operation as the
* difference of the current time and the given start time "whence".
*
* @return 0 if whence > now, otherwise now-whence.
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_absolute_get_duration (struct GNUNET_TIME_Absolute whence)
{
struct GNUNET_TIME_Absolute now;
struct GNUNET_TIME_Relative ret;
now = GNUNET_TIME_absolute_get ();
if (whence.abs_value_us > now.abs_value_us)
return GNUNET_TIME_UNIT_ZERO;
ret.rel_value_us = now.abs_value_us - whence.abs_value_us;
return ret;
}
/**
* Add a given relative duration to the
* given start time.
*
* @return FOREVER if either argument is FOREVER or on overflow; start+duration otherwise
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_add (struct GNUNET_TIME_Absolute start,
struct GNUNET_TIME_Relative duration)
{
struct GNUNET_TIME_Absolute ret;
if ((start.abs_value_us == UINT64_MAX) ||
(duration.rel_value_us == UINT64_MAX))
return GNUNET_TIME_UNIT_FOREVER_ABS;
if (start.abs_value_us + duration.rel_value_us < start.abs_value_us)
{
GNUNET_break (0);
return GNUNET_TIME_UNIT_FOREVER_ABS;
}
ret.abs_value_us = start.abs_value_us + duration.rel_value_us;
return ret;
}
/**
* Subtract a given relative duration from the
* given start time.
*
* @param start some absolute time
* @param duration some relative time to subtract
* @return ZERO if start <= duration, or FOREVER if start time is FOREVER; start-duration otherwise
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_subtract (struct GNUNET_TIME_Absolute start,
struct GNUNET_TIME_Relative duration)
{
struct GNUNET_TIME_Absolute ret;
if (start.abs_value_us <= duration.rel_value_us)
return GNUNET_TIME_UNIT_ZERO_ABS;
if (start.abs_value_us == GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us)
return GNUNET_TIME_UNIT_FOREVER_ABS;
ret.abs_value_us = start.abs_value_us - duration.rel_value_us;
return ret;
}
/**
* Multiply relative time by a given factor.
*
* @return FOREVER if rel=FOREVER or on overflow; otherwise rel*factor
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_multiply (struct GNUNET_TIME_Relative rel,
unsigned long long factor)
{
struct GNUNET_TIME_Relative ret;
if (0 == factor)
return GNUNET_TIME_UNIT_ZERO;
if (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
return GNUNET_TIME_UNIT_FOREVER_REL;
ret.rel_value_us = rel.rel_value_us * factor;
if (ret.rel_value_us / factor != rel.rel_value_us)
{
GNUNET_break (0);
return GNUNET_TIME_UNIT_FOREVER_REL;
}
return ret;
}
/**
* Multiply relative time by a given floating-point factor. The factor must be
* positive.
*
* @return FOREVER if rel=FOREVER or on overflow; otherwise rel*factor
*/
struct GNUNET_TIME_Relative
relative_multiply_double (struct GNUNET_TIME_Relative rel, double factor)
{
struct GNUNET_TIME_Relative out;
double m;
GNUNET_assert (0 <= factor);
if (0 == factor)
return GNUNET_TIME_UNIT_ZERO;
if (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
return GNUNET_TIME_UNIT_FOREVER_REL;
m = ((double) rel.rel_value_us) * factor;
if (m >= (double) (GNUNET_TIME_UNIT_FOREVER_REL).rel_value_us)
{
GNUNET_break (0);
return GNUNET_TIME_UNIT_FOREVER_REL;
}
out.rel_value_us = (uint64_t) m;
return out;
}
/**
* Saturating multiply relative time by a given factor.
*
* @param rel some duration
* @param factor integer to multiply with
* @return FOREVER if rel=FOREVER or on overflow; otherwise rel*factor
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_saturating_multiply (struct GNUNET_TIME_Relative rel,
unsigned long long factor)
{
struct GNUNET_TIME_Relative ret;
if (0 == factor)
return GNUNET_TIME_UNIT_ZERO;
if (rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
return GNUNET_TIME_UNIT_FOREVER_REL;
ret.rel_value_us = rel.rel_value_us * factor;
if (ret.rel_value_us / factor != rel.rel_value_us)
{
return GNUNET_TIME_UNIT_FOREVER_REL;
}
return ret;
}
/**
* Divide relative time by a given factor.
*
* @param rel some duration
* @param factor integer to divide by
* @return FOREVER if rel=FOREVER or factor==0; otherwise rel/factor
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_divide (struct GNUNET_TIME_Relative rel,
unsigned long long factor)
{
struct GNUNET_TIME_Relative ret;
if ((0 == factor) ||
(rel.rel_value_us == GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us))
return GNUNET_TIME_UNIT_FOREVER_REL;
ret.rel_value_us = rel.rel_value_us / factor;
return ret;
}
/**
* Calculate the estimate time of arrival/completion
* for an operation.
*
* @param start when did the operation start?
* @param finished how much has been done?
* @param total how much must be done overall (same unit as for "finished")
* @return remaining duration for the operation,
* assuming it continues at the same speed
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_calculate_eta (struct GNUNET_TIME_Absolute start,
uint64_t finished,
uint64_t total)
{
struct GNUNET_TIME_Relative dur;
double exp;
struct GNUNET_TIME_Relative ret;
GNUNET_break (finished <= total);
if (finished >= total)
return GNUNET_TIME_UNIT_ZERO;
if (0 == finished)
return GNUNET_TIME_UNIT_FOREVER_REL;
dur = GNUNET_TIME_absolute_get_duration (start);
exp = ((double) dur.rel_value_us) * ((double) total) / ((double) finished);
ret.rel_value_us = ((uint64_t) exp) - dur.rel_value_us;
return ret;
}
/**
* Add relative times together.
*
* @param a1 first timestamp
* @param a2 second timestamp
* @return FOREVER if either argument is FOREVER or on overflow; a1+a2 otherwise
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_add (struct GNUNET_TIME_Relative a1,
struct GNUNET_TIME_Relative a2)
{
struct GNUNET_TIME_Relative ret;
if ((a1.rel_value_us == UINT64_MAX) || (a2.rel_value_us == UINT64_MAX))
return GNUNET_TIME_UNIT_FOREVER_REL;
if (a1.rel_value_us + a2.rel_value_us < a1.rel_value_us)
{
GNUNET_break (0);
return GNUNET_TIME_UNIT_FOREVER_REL;
}
ret.rel_value_us = a1.rel_value_us + a2.rel_value_us;
return ret;
}
/**
* Subtract relative timestamp from the other.
*
* @param a1 first timestamp
* @param a2 second timestamp
* @return ZERO if a2>=a1 (including both FOREVER), FOREVER if a1 is FOREVER, a1-a2 otherwise
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_subtract (struct GNUNET_TIME_Relative a1,
struct GNUNET_TIME_Relative a2)
{
struct GNUNET_TIME_Relative ret;
if (a2.rel_value_us >= a1.rel_value_us)
return GNUNET_TIME_UNIT_ZERO;
if (a1.rel_value_us == UINT64_MAX)
return GNUNET_TIME_UNIT_FOREVER_REL;
ret.rel_value_us = a1.rel_value_us - a2.rel_value_us;
return ret;
}
/**
* Convert relative time to network byte order.
*
* @param a time to convert
* @return time in network byte order
*/
struct GNUNET_TIME_RelativeNBO
GNUNET_TIME_relative_hton (struct GNUNET_TIME_Relative a)
{
struct GNUNET_TIME_RelativeNBO ret;
ret.rel_value_us__ = GNUNET_htonll (a.rel_value_us);
return ret;
}
/**
* Convert relative time from network byte order.
*
* @param a time to convert
* @return time in host byte order
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_relative_ntoh (struct GNUNET_TIME_RelativeNBO a)
{
struct GNUNET_TIME_Relative ret;
ret.rel_value_us = GNUNET_ntohll (a.rel_value_us__);
return ret;
}
/**
* Convert absolute time to network byte order.
*
* @param a time to convert
* @return time in network byte order
*/
struct GNUNET_TIME_AbsoluteNBO
GNUNET_TIME_absolute_hton (struct GNUNET_TIME_Absolute a)
{
struct GNUNET_TIME_AbsoluteNBO ret;
ret.abs_value_us__ = GNUNET_htonll (a.abs_value_us);
return ret;
}
/**
* Convert absolute time from network byte order.
*
* @param a time to convert
* @return time in host byte order
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_ntoh (struct GNUNET_TIME_AbsoluteNBO a)
{
struct GNUNET_TIME_Absolute ret;
ret.abs_value_us = GNUNET_ntohll (a.abs_value_us__);
return ret;
}
/**
* Return the current year (i.e. '2011').
*/
unsigned int
GNUNET_TIME_get_current_year ()
{
time_t tp;
struct tm *t;
tp = time (NULL);
t = gmtime (&tp);
if (t == NULL)
return 0;
return t->tm_year + 1900;
}
/**
* Convert an expiration time to the respective year (rounds)
*
* @param at absolute time
* @return year a year (after 1970), 0 on error
*/
unsigned int
GNUNET_TIME_time_to_year (struct GNUNET_TIME_Absolute at)
{
struct tm *t;
time_t tp;
tp = at.abs_value_us / 1000LL / 1000LL; /* microseconds to seconds */
t = gmtime (&tp);
if (t == NULL)
return 0;
return t->tm_year + 1900;
}
/**
* Convert a year to an expiration time of January 1st of that year.
*
* @param year a year (after 1970, please ;-)).
* @return absolute time for January 1st of that year.
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_year_to_time (unsigned int year)
{
struct GNUNET_TIME_Absolute ret;
time_t tp;
struct tm t;
memset (&t, 0, sizeof(t));
if (year < 1900)
{
GNUNET_break (0);
return GNUNET_TIME_absolute_get (); /* now */
}
t.tm_year = year - 1900;
t.tm_mday = 1;
t.tm_mon = 0;
t.tm_wday = 1;
t.tm_yday = 1;
tp = mktime (&t);
GNUNET_break (tp != (time_t) -1);
ret.abs_value_us = tp * 1000LL * 1000LL; /* seconds to microseconds */
return ret;
}
/**
* Randomized exponential back-off, starting at 1 ms
* and going up by a factor of 2+r, where 0 <= r <= 0.5, up
* to a maximum of the given threshold.
*
* @param r current backoff time, initially zero
* @param threshold maximum value for backoff
* @return the next backoff time
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_randomized_backoff (struct GNUNET_TIME_Relative rt,
struct GNUNET_TIME_Relative threshold)
{
double r = (rand () % 500) / 1000.0;
struct GNUNET_TIME_Relative t;
t = relative_multiply_double (
GNUNET_TIME_relative_max (GNUNET_TIME_UNIT_MILLISECONDS, rt),
2 + r);
return GNUNET_TIME_relative_min (threshold, t);
}
/**
* Return a random time value between 0.5*r and 1.5*r.
*
* @param r input time for scaling
* @return randomized time
*/
struct GNUNET_TIME_Relative
GNUNET_TIME_randomize (struct GNUNET_TIME_Relative r)
{
double d = ((rand () % 1001) - 500) / 1000.0;
return relative_multiply_double (r, d);
}
/**
* Obtain the current time and make sure it is monotonically
* increasing. Guards against systems without an RTC or
* clocks running backwards and other nasty surprises. Does
* not guarantee that the returned time is near the current
* time returned by #GNUNET_TIME_absolute_get(). Two
* subsequent calls (within a short time period) may return the
* same value. Persists the last returned time on disk to
* ensure that time never goes backwards. As a result, the
* resulting value can be used to check if a message is the
* "most recent" value and replays of older messages (from
* the same origin) would be discarded.
*
* @param cfg configuration, used to determine where to
* store the time; user can also insist RTC is working
* nicely and disable the feature
* @return monotonically increasing time
*/
struct GNUNET_TIME_Absolute
GNUNET_TIME_absolute_get_monotonic (
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
static const struct GNUNET_CONFIGURATION_Handle *last_cfg;
static struct GNUNET_TIME_Absolute last_time;
static struct GNUNET_DISK_MapHandle *map_handle;
static ATOMIC volatile uint64_t *map;
struct GNUNET_TIME_Absolute now;
now = GNUNET_TIME_absolute_get ();
if (last_cfg != cfg)
{
char *filename;
if (NULL != map_handle)
{
GNUNET_DISK_file_unmap (map_handle);
map_handle = NULL;
}
map = NULL;
last_cfg = cfg;
if ((NULL != cfg) &&
(GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_filename (cfg,
"util",
"MONOTONIC_TIME_FILENAME",
&filename)))
{
struct GNUNET_DISK_FileHandle *fh;
fh = GNUNET_DISK_file_open (filename,
GNUNET_DISK_OPEN_READWRITE
| GNUNET_DISK_OPEN_CREATE,
GNUNET_DISK_PERM_USER_WRITE
| GNUNET_DISK_PERM_GROUP_WRITE
| GNUNET_DISK_PERM_USER_READ
| GNUNET_DISK_PERM_GROUP_READ);
if (NULL == fh)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_ ("Failed to map `%s', cannot assure monotonic time!\n"),
filename);
}
else
{
off_t size;
size = 0;
GNUNET_break (GNUNET_OK == GNUNET_DISK_file_handle_size (fh, &size));
if (size < (off_t) sizeof(*map))
{
struct GNUNET_TIME_AbsoluteNBO o;
o = GNUNET_TIME_absolute_hton (now);
if (sizeof(o) != GNUNET_DISK_file_write (fh, &o, sizeof(o)))
size = 0;
else
size = sizeof(o);
}
if (size == sizeof(*map))
{
map = GNUNET_DISK_file_map (fh,
&map_handle,
GNUNET_DISK_MAP_TYPE_READWRITE,
sizeof(*map));
if (NULL == map)
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_ (
"Failed to map `%s', cannot assure monotonic time!\n"),
filename);
}
else
{
GNUNET_log (
GNUNET_ERROR_TYPE_WARNING,
_ (
"Failed to setup monotonic time file `%s', cannot assure monotonic time!\n"),
filename);
}
}
GNUNET_DISK_file_close (fh);
GNUNET_free (filename);
}
}
if (NULL != map)
{
struct GNUNET_TIME_AbsoluteNBO mt;
#if __STDC_NO_ATOMICS__
#if __GNUC__
mt.abs_value_us__ = __sync_fetch_and_or (map, 0);
#else
mt.abs_value_us__ = *map; /* godspeed, pray this is atomic */
#endif
#else
mt.abs_value_us__ = atomic_load (map);
#endif
last_time =
GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_ntoh (mt), last_time);
}
if (now.abs_value_us <= last_time.abs_value_us)
now.abs_value_us = last_time.abs_value_us + 1;
last_time = now;
if (NULL != map)
{
uint64_t val = GNUNET_TIME_absolute_hton (now).abs_value_us__;
#if __STDC_NO_ATOMICS__
#if __GNUC__
(void) __sync_lock_test_and_set (map, val);
#else
*map = val; /* godspeed, pray this is atomic */
#endif
#else
atomic_store (map, val);
#endif
}
return now;
}
/**
* Destructor
*/
void __attribute__ ((destructor))
GNUNET_util_time_fini ()
{
(void) GNUNET_TIME_absolute_get_monotonic (NULL);
}
/* end of time.c */