Add a simple timer implementation for use in benchmarking.

test/include/test/jemalloc_test.h.in

@@ -5,6 +5,7 @@
 #include <inttypes.h>
 #include <math.h>
 #include <string.h>
+#include <sys/time.h>
 
 #ifdef _WIN32
 #  include <windows.h>
@@ -136,6 +137,7 @@
 #include "test/mtx.h"
 #include "test/mq.h"
 #include "test/test.h"
+#include "test/timer.h"
 #include "test/thd.h"
 #define	MEXP 19937
 #include "test/SFMT.h"

test/include/test/timer.h

@@ -0,0 +1,15 @@
+/*
+ * Simple timer, for use in benchmark reporting.
+ */
+
+#include <sys/time.h>
+
+typedef struct {
+	struct timeval tv0;
+	struct timeval tv1;
+} timer_t;
+
+void	timer_start(timer_t *timer);
+void	timer_stop(timer_t *timer);
+uint64_t	timer_usec(const timer_t *timer);
+void	timer_ratio(timer_t *a, timer_t *b, char *buf, size_t buflen);