1 files changed, 31 insertions, 0 deletions
diff --git a/src/timer.h b/src/timer.h
new file mode 100644
index 0000000..904bd6a
--- /dev/null
+++ b/src/timer.h
@@ -0,0 +1,31 @@
+//https://github.com/zuqqhi2/numerical_simulation/blob/master/multithread/laytrace/timer.h
+
+#ifndef _H_TIMER
+#define _H_TIMER
+
+#include <stdio.h>
+#include <sys/time.h>
+
+static inline
+unsigned long long gettimeval(void) {
+  struct timeval tv;
+  struct timezone tz;
+  gettimeofday(&tv, &tz);
+  return ((unsigned long long)tv.tv_sec)*1000000+tv.tv_usec;
+}
+
+static inline
+void start_timer(unsigned long long *startt) {
+  *startt = gettimeval();
+  return;
+}
+
+static inline
+unsigned long long stop_timer(unsigned long long *startt) {
+  unsigned long long stopt = gettimeval();
+  return (stopt>=*startt)?(stopt-*startt):(stopt);
+}
+
+#define print_timer(te) {printf("time of %s:%f[sec]\n", #te, (te*1.0e-3)/1000);}
+
+#endif