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sched: provide low-precision monotonic time

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Measure the interval since the start in order to provide a monotonic
time for periodical tasks not using timers like driftfile updates, key
refresh, etc. Return the interval in the double format, but keep an
integer remainder limiting the precision to 0.01 second to avoid issues
with very small increments in a long-running process.
This commit is contained in:
Miroslav Lichvar
2020-03-11 08:56:17 +01:00
parent 46f954490d
commit bb0553e4c4
2 changed files with 46 additions and 0 deletions
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3
sched.h
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@@ -65,6 +65,9 @@ extern void SCH_SetFileHandlerEvent(int fd, int event, int enable);
/* Get the time stamp taken after a file descriptor became ready or a timeout expired */
extern void SCH_GetLastEventTime(struct timespec *cooked, double *err, struct timespec *raw);
/* Get a low-precision monotonic timestamp (starting at 0.0) */
extern double SCH_GetLastEventMonoTime(void);
/* This queues a timeout to elapse at a given (raw) local time */
extern SCH_TimeoutID SCH_AddTimeout(struct timespec *ts, SCH_TimeoutHandler handler, SCH_ArbitraryArgument arg);