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Add a couple of time helper functions.

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Also add rounding support to tv_mdiff().
This commit is contained in:
Mike Perry 2009-09-20 18:03:39 -07:00
parent cf2afcd707
commit e2cc4e353a
2 changed files with 42 additions and 1 deletions
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40
src/common/util.c
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@ -1034,6 +1034,42 @@ wrap_string(smartlist_t *out, const char *string, size_t width,
* Time
* ===== */
/**
* Converts struct timeval to a double value.
* Preserves microsecond precision, but just barely.
* Error is approx +/- 0.1 usec when dealing with epoch values.
*/
double
tv_to_double(const struct timeval *tv)
{
double conv = tv->tv_sec;
conv += tv->tv_usec/1000000.0;
return conv;
}
/**
* Converts timeval to milliseconds.
*/
int64_t
tv_to_msec(const struct timeval *tv)
{
int64_t conv = ((int64_t)tv->tv_sec)*1000L;
/* Round ghetto-style */
conv += (tv->tv_usec+500)/1000L;
return conv;
}
/**
* Converts timeval to microseconds.
*/
int64_t
tv_to_usec(const struct timeval *tv)
{
int64_t conv = ((int64_t)tv->tv_sec)*1000000L;
conv += tv->tv_usec;
return conv;
}
/** Return the number of microseconds elapsed between *start and *end.
*/
long
@ -1066,7 +1102,9 @@ tv_mdiff(const struct timeval *start, const struct timeval *end)
return LONG_MAX;
}
mdiff = secdiff*1000L + ((long)end->tv_usec - (long)start->tv_usec) / 1000L;
/* Subtract and round */
mdiff = secdiff*1000L +
((long)end->tv_usec - (long)start->tv_usec + 500L) / 1000L;
return mdiff;
}

3
src/common/util.h
View File

@ -212,6 +212,9 @@ void base16_encode(char *dest, size_t destlen, const char *src, size_t srclen);
int base16_decode(char *dest, size_t destlen, const char *src, size_t srclen);
/* Time helpers */
double tv_to_double(const struct timeval *tv);
int64_t tv_to_msec(const struct timeval *tv);
int64_t tv_to_usec(const struct timeval *tv);
long tv_udiff(const struct timeval *start, const struct timeval *end);
long tv_mdiff(const struct timeval *start, const struct timeval *end);
time_t tor_timegm(struct tm *tm);