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-rw-r--r--nserver/src/stats.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/nserver/src/stats.h b/nserver/src/stats.h
new file mode 100644
index 0000000..997a505
--- /dev/null
+++ b/nserver/src/stats.h
@@ -0,0 +1,33 @@
+#ifndef stats_h
+#define stats_h
+#include <math.h>
+
+typedef struct Stats {
+ double sum;
+ double sumsq;
+ unsigned long n;
+ double min;
+ double max;
+} Stats;
+
+Stats *Stats_recreate(double sum, double sumsq, unsigned long n,
+ double min, double max);
+
+Stats *Stats_create();
+
+void Stats_sample(Stats *st, double s);
+
+void Stats_dump(Stats *st);
+
+static inline double Stats_mean(Stats *st)
+{
+ return st->sum / st->n;
+}
+
+static inline double Stats_stddev(Stats *st)
+{
+ return sqrt((st->sumsq - (st->sum * st->sum / st->n)) /
+ (st->n - 1));
+}
+
+#endif