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Diffstat (limited to '')
| -rw-r--r-- | sourcestats.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/sourcestats.h b/sourcestats.h new file mode 100644 index 0000000..e10f425 --- /dev/null +++ b/sourcestats.h @@ -0,0 +1,141 @@ +/* + chronyd/chronyc - Programs for keeping computer clocks accurate. + + ********************************************************************** + * Copyright (C) Richard P. Curnow 1997-2002 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program 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 + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + ********************************************************************** + + ======================================================================= + + Header file for module that deals with the measurements and statistics of + each of the sources. */ + +#ifndef GOT_SOURCESTATS_H +#define GOT_SOURCESTATS_H + +#include "sysincl.h" + +#include "reports.h" + +typedef struct SST_Stats_Record *SST_Stats; + +/* Init and fini functions */ +extern void SST_Initialise(void); +extern void SST_Finalise(void); + +/* This function creates a new instance of the statistics handler */ +extern SST_Stats SST_CreateInstance(uint32_t refid, IPAddr *addr, + int min_samples, int max_samples, + double min_delay, double asymmetry); + +/* This function deletes an instance of the statistics handler. */ +extern void SST_DeleteInstance(SST_Stats inst); + +/* This function resets an instance */ +extern void SST_ResetInstance(SST_Stats inst); + +/* This function changes the reference ID and IP address */ +extern void SST_SetRefid(SST_Stats inst, uint32_t refid, IPAddr *addr); + +/* This function accumulates a single sample into the statistics handler */ +extern void SST_AccumulateSample(SST_Stats inst, NTP_Sample *sample); + +/* This function runs the linear regression operation on the data. It + finds the set of most recent samples that give the tightest + confidence interval for the frequency, and truncates the register + down to that number of samples. */ +extern void SST_DoNewRegression(SST_Stats inst); + +/* Return the assumed worst case range of values that this source's + frequency lies within. Frequency is defined as the amount of time + the local clock gains relative to the source per unit local clock + time. */ +extern void SST_GetFrequencyRange(SST_Stats inst, double *lo, double *hi); + +/* Get data needed for selection */ +extern void +SST_GetSelectionData(SST_Stats inst, struct timespec *now, + double *offset_lo_limit, + double *offset_hi_limit, + double *root_distance, + double *variance, + double *first_sample_ago, + double *last_sample_ago, + int *select_ok); + +/* Get data needed when setting up tracking on this source */ +extern void +SST_GetTrackingData(SST_Stats inst, struct timespec *ref_time, + double *average_offset, double *offset_sd, + double *frequency, double *frequency_sd, double *skew, + double *root_delay, double *root_dispersion); + +/* This routine is called when the local machine clock parameters are + changed. It adjusts all existing samples that we are holding for + each peer so that it looks like they were made under the new clock + regime rather than the old one. + + when = cooked local time when the change occurs + + dfreq = delta frequency. positive means the clock has been adjusted + because it was previously gaining time relative to the external + reference(s). + + doffset = offset slewed onto local clock. positive => local clock + has been made fast by that amount. + +*/ + +extern void SST_SlewSamples(SST_Stats inst, struct timespec *when, double dfreq, double doffset); + +/* This routine corrects already accumulated samples to improve the + frequency estimate when a new sample is accumulated */ +extern void SST_CorrectOffset(SST_Stats inst, double doffset); + +/* This routine is called when an indeterminate offset is introduced + into the local time. */ +extern void SST_AddDispersion(SST_Stats inst, double dispersion); + +/* Predict the offset of the local clock relative to a given source at + a given local cooked time. Positive indicates local clock is FAST + relative to reference. */ +extern double SST_PredictOffset(SST_Stats inst, struct timespec *when); + +/* Find the minimum round trip delay in the register */ +extern double SST_MinRoundTripDelay(SST_Stats inst); + +/* Get data needed for testing NTP delay */ +extern int SST_GetDelayTestData(SST_Stats inst, struct timespec *sample_time, + double *last_sample_ago, double *predicted_offset, + double *min_delay, double *skew, double *std_dev); + +extern int SST_SaveToFile(SST_Stats inst, FILE *out); + +extern int SST_LoadFromFile(SST_Stats inst, FILE *in); + +extern void SST_DoSourceReport(SST_Stats inst, RPT_SourceReport *report, struct timespec *now); + +extern void SST_DoSourcestatsReport(SST_Stats inst, RPT_SourcestatsReport *report, struct timespec *now); + +extern int SST_Samples(SST_Stats inst); + +extern int SST_GetMinSamples(SST_Stats inst); + +extern double SST_GetJitterAsymmetry(SST_Stats inst); + +#endif /* GOT_SOURCESTATS_H */ + |