[C++] Use C++11's threading library again

It seems we can use it even for -static build with
-Wl,--whole-archive -lpthread -Wl,--no-whole-archive -ldl

1 files changed, 2 insertions, 3 deletions

diff --git a/stats.h b/stats.h
index 190fa57..63acc55 100644
--- a/stats.h
+++ b/stats.h
@@ -15,10 +15,9 @@
 #ifndef STATS_H_
 #define STATS_H_
 
+#include <mutex>
 #include <string>
 
-#include "mutex.h"
-
 using namespace std;
 
 class Stats {
@@ -36,7 +35,7 @@ class Stats {
   const char* name_;
   double elapsed_;
   int cnt_;
-  mutable Mutex mu_;
+  mutable mutex mu_;
 };
 
 class ScopedStatsRecorder {