n_clock_sync.c File Reference

Clock synchronization estimator implementation. More...

#include "nilorea/n_clock_sync.h"
#include "nilorea/n_log.h"
#include "nilorea/n_common.h"
#include <string.h>
#include <stdlib.h>

Include dependency graph for n_clock_sync.c:

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Functions
static double	clock_sync_effective_offset (const N_CLOCK_SYNC *cs, double local_now)
	effective (slewed) offset at local_now — pure function of the stored state so the const getter needs no mutation.
static void	clock_sync_store_sample (N_CLOCK_SYNC *cs, double offset, double rtt, double local_now)
	store one (offset, rtt) sample and recompute the estimates.
static int	cmp_double (const void *a, const void *b)
	comparison function for qsort on doubles
static double	median_of (const double *samples, int count)
	compute the median of an array of doubles
void	n_clock_sync_delete (N_CLOCK_SYNC **cs)
	free a clock sync estimator
void	n_clock_sync_mark_sent (N_CLOCK_SYNC *cs, double local_now)
	mark that a sync request was just sent
N_CLOCK_SYNC *	n_clock_sync_new (void)
	allocate and initialize a new clock sync estimator
int	n_clock_sync_process_response (N_CLOCK_SYNC *cs, double client_send_time, double server_time, double local_now)
	record a sync response: client_send_time is the local time the request was sent, server_time is the server's timestamp from the response, local_now is the current local time when the response was received.
void	n_clock_sync_seed (N_CLOCK_SYNC *cs, double offset, double rtt)
	Inject a synthetic (offset, rtt) sample, e.g.
double	n_clock_sync_server_time (const N_CLOCK_SYNC *cs, double local_now)
	get estimated server time given a local time value.
int	n_clock_sync_should_send (const N_CLOCK_SYNC *cs, double local_now)
	check if it's time to send a new sync request (returns TRUE/FALSE).

Detailed Description

Clock synchronization estimator implementation.

Author

Castagnier Mickael

Version

1.1

Date

19/07/2026

Definition in file n_clock_sync.c.