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Update drift file at most once per hour

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Instead of writing to the file on every reference update, update it
on first update, on exit and otherwise only once per hour.
This commit is contained in:
Miroslav Lichvar 2010-04-15 15:48:31 +02:00
parent 14d2576924
commit e0009f9f40
1 changed files with 19 additions and 8 deletions
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27
reference.c
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@ -76,6 +76,7 @@ static char *mail_change_user;
/* Filename of the drift file. */
static char *drift_file=NULL;
static double drift_file_age;
static void update_drift_file(double, double);
@ -155,7 +156,7 @@ REF_Initialise(void)
drift_file);
}
update_drift_file(our_frequency_ppm,our_skew);
drift_file_age = 0.0;
}
LCL_SetAbsoluteFrequency(our_frequency_ppm);
@ -201,6 +202,10 @@ REF_Finalise(void)
LCL_SetLeap(0);
}
if (drift_file && drift_file_age > 0.0) {
update_drift_file(LCL_ReadAbsoluteFrequency(), our_skew);
}
Free(fb_drifts);
initialised = 0;
@ -531,6 +536,8 @@ REF_SetReference(int stratum,
double abs_freq_ppm;
double update_interval;
assert(initialised);
/* Avoid getting NaNs */
@ -630,21 +637,25 @@ REF_SetReference(int stratum,
1.0e6*our_skew,
our_offset);
UTI_DiffTimevalsToDouble(&update_interval, ref_time, &last_ref_update);
if (drift_file) {
update_drift_file(abs_freq_ppm, our_skew);
/* Update drift file at most once per hour */
drift_file_age += update_interval;
if (drift_file_age < 0.0 || drift_file_age > 3600.0) {
update_drift_file(abs_freq_ppm, our_skew);
drift_file_age = 0.0;
}
}
/* Update fallback drifts */
if (fb_drifts) {
double update_interval;
UTI_DiffTimevalsToDouble(&update_interval, ref_time, &last_ref_update);
update_fb_drifts(abs_freq_ppm, update_interval);
last_ref_update = *ref_time;
last_ref_update_interval = update_interval;
}
last_ref_update = *ref_time;
last_ref_update_interval = update_interval;
/* And now set the freq and offset to zero */
our_frequency = 0.0;
our_offset = 0.0;