renamed files for code cleanup

sys.cpp

@@ -0,0 +1,43 @@
+#include <sys/resource.h>
+#include <sys/time.h>
+#include "htab.h"
+
+int yak_verbose = 3;
+
+static double yak_realtime0;
+
+double yak_cputime(void)
+{
+	struct rusage r;
+	getrusage(RUSAGE_SELF, &r);
+	return r.ru_utime.tv_sec + r.ru_stime.tv_sec + 1e-6 * (r.ru_utime.tv_usec + r.ru_stime.tv_usec);
+}
+
+static inline double yak_realtime_core(void)
+{
+	struct timeval tp;
+	struct timezone tzp;
+	gettimeofday(&tp, &tzp);
+	return tp.tv_sec + tp.tv_usec * 1e-6;
+}
+
+void yak_reset_realtime(void)
+{
+	yak_realtime0 = yak_realtime_core();
+}
+
+double yak_realtime(void)
+{
+	return yak_realtime_core() - yak_realtime0;
+}
+
+long yak_peakrss(void)
+{
+	struct rusage r;
+	getrusage(RUSAGE_SELF, &r);
+#ifdef __linux__
+	return r.ru_maxrss * 1024;
+#else
+	return r.ru_maxrss;
+#endif
+}