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
diff --git a/include/osmocom/core/statistics.h b/include/osmocom/core/statistics.h
index a9a623d..1e472ff 100644
--- a/include/osmocom/core/statistics.h
+++ b/include/osmocom/core/statistics.h
@@ -9,6 +9,7 @@
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 @@
* \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);