From d85bb781399c6113887d1a3d6ec8be07dce8513d Mon Sep 17 00:00:00 2001
From: "U-DESKTOP-T772REH\\wangyu" <wangyu.cn@gmail.com>
Date: Tue, 19 Jun 2018 00:48:09 +0800
Subject: [PATCH] fix broken random device on mingw

---
 common.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/common.cpp b/common.cpp
index 62aa66c..fb23fbe 100644
--- a/common.cpp
+++ b/common.cpp
@@ -158,7 +158,11 @@ struct my_random_t
 
     my_random_t()
 	{
-    	std::mt19937 gen_tmp(rd());
+    	//std::mt19937 gen_tmp(rd());  //random device is broken on mingw
+	timespec tmp_time;
+	clock_gettime(CLOCK_MONOTONIC, &tmp_time);
+	long  long  a=((u64_t)tmp_time.tv_sec)*1000000000llu+((u64_t)tmp_time.tv_nsec);
+    	std::mt19937 gen_tmp(a);
     	gen=gen_tmp;
     	gen.discard(700000);  //magic
 	}