From 589243bb5c1b1146d840824d67c666c17a750ded Mon Sep 17 00:00:00 2001
From: =?utf8?q?Vladimir=20Plazun/AI=20Tools=20Lab=20/SRR/Engineer/?=
 =?utf8?q?=EC=82=BC=EC=84=B1=EC=A0=84=EC=9E=90?= <v.plazun@samsung.com>
Date: Mon, 26 Aug 2019 21:51:53 +0300
Subject: [PATCH] [nnpkg_run] use chrono to measure time (#6858)

Use c++ chrono instead of linux's gettimeofday

Signed-off-by: Vladimir Plazun <v.plazun@samsung.com>
---
 tests/tools/nnpackage_run/src/nnpackage_run.cc | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/tests/tools/nnpackage_run/src/nnpackage_run.cc b/tests/tools/nnpackage_run/src/nnpackage_run.cc
index dce5dbd..97edebf 100644
--- a/tests/tools/nnpackage_run/src/nnpackage_run.cc
+++ b/tests/tools/nnpackage_run/src/nnpackage_run.cc
@@ -22,7 +22,8 @@
 
 #include <assert.h>
 #include <iostream>
-#include <sys/time.h>
+
+#include <chrono>
 
 #define NNPR_ENSURE_STATUS(a)        \
   do                                 \
@@ -35,9 +36,10 @@
 
 uint64_t NowMicros()
 {
-  struct timeval tv;
-  gettimeofday(&tv, nullptr);
-  return static_cast<uint64_t>(tv.tv_sec) * 1000000 + tv.tv_usec;
+  auto time_point = std::chrono::high_resolution_clock::now();
+  auto since_epoch = time_point.time_since_epoch();
+  // default precision of high resolution clock is 10e-9 (nanoseconds)
+  return std::chrono::duration_cast<std::chrono::microseconds>(since_epoch).count();
 }
 
 uint64_t num_elems(const nnfw_tensorinfo *ti)
-- 
2.7.4