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core: Add difference function to osmo_counter 

The osmo_counter_difference returns the counter value difference
since the last call of this function with the given counter object.

Sponsored-by: On-Waves ehf
This commit is contained in:
Jacob Erlbeck 2015-10-26 14:39:08 +01:00
parent c27671c109
commit 80db4ec387
2 changed files with 12 additions and 0 deletions
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4
include/osmocom/core/statistics.h
View File

@ -9,6 +9,7 @@ struct osmo_counter {
const char *name; /*!< \brief human-readable name */
const char *description; /*!< \brief humn-readable description */
unsigned long value; /*!< \brief current value */
unsigned long previous; /*!< \brief previous value */
};
/*! \brief Increment counter */
@ -48,3 +49,6 @@ int osmo_counters_for_each(int (*handle_counter)(struct osmo_counter *, void *),
* \returns pointer to counter (\ref osmo_counter) or NULL otherwise
*/
struct osmo_counter *osmo_counter_get_by_name(const char *name);
/*! \brief Return the counter difference since the last call to this function */
int osmo_counter_difference(struct osmo_counter *ctr);

8
src/statistics.c
View File

@ -74,3 +74,11 @@ struct osmo_counter *osmo_counter_get_by_name(const char *name)
}
return NULL;
}
int osmo_counter_difference(struct osmo_counter *ctr)
{
int delta = ctr->value - ctr->previous;
ctr->previous = ctr->value;
return delta;
}