From 1d31093d4d8501a5dc031413a963707f6cae0e0a Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sat, 11 Feb 2017 12:37:05 -0800
Subject: [PATCH] fix tsan: utiltime race on nMockTime

---
 src/utiltime.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/utiltime.cpp b/src/utiltime.cpp
index a9936a645aa..510f540b1d5 100644
--- a/src/utiltime.cpp
+++ b/src/utiltime.cpp
@@ -9,14 +9,17 @@
 
 #include "utiltime.h"
 
+#include <atomic>
+
 #include <boost/date_time/posix_time/posix_time.hpp>
 #include <boost/thread.hpp>
 
-static int64_t nMockTime = 0; //!< For unit testing
+static std::atomic<int64_t> nMockTime(0); //!< For unit testing
 
 int64_t GetTime()
 {
-    if (nMockTime) return nMockTime;
+    int64_t mocktime = nMockTime.load(std::memory_order_relaxed);
+    if (mocktime) return mocktime;
 
     time_t now = time(NULL);
     assert(now > 0);
@@ -25,7 +28,7 @@ int64_t GetTime()
 
 void SetMockTime(int64_t nMockTimeIn)
 {
-    nMockTime = nMockTimeIn;
+    nMockTime.store(nMockTimeIn, std::memory_order_relaxed);
 }
 
 int64_t GetTimeMillis()
@@ -52,7 +55,8 @@ int64_t GetSystemTimeInSeconds()
 /** Return a time useful for the debug log */
 int64_t GetLogTimeMicros()
 {
-    if (nMockTime) return nMockTime*1000000;
+    int64_t mocktime = nMockTime.load(std::memory_order_relaxed);
+    if (mocktime) return mocktime*1000000;
 
     return GetTimeMicros();
 }