updated boost on windows

winx64/include/boost/thread/pthread/pthread_helpers.hpp

@@ -0,0 +1,42 @@
+#ifndef BOOST_THREAD_PTHREAD_PTHREAD_HELPERS_HPP
+#define BOOST_THREAD_PTHREAD_PTHREAD_HELPERS_HPP
+// Copyright (C) 2017
+// Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/thread/detail/config.hpp>
+#include <pthread.h>
+
+#include <boost/config/abi_prefix.hpp>
+
+namespace boost
+{
+    namespace pthread
+    {
+      inline int cond_init(pthread_cond_t& cond) {
+
+  #ifdef BOOST_THREAD_INTERNAL_CLOCK_IS_MONO
+              pthread_condattr_t attr;
+              int res = pthread_condattr_init(&attr);
+              if (res)
+              {
+                return res;
+              }
+              pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
+              res=pthread_cond_init(&cond,&attr);
+              pthread_condattr_destroy(&attr);
+              return res;
+  #else
+              return pthread_cond_init(&cond,NULL);
+  #endif
+
+      }
+    }
+}
+
+#include <boost/config/abi_suffix.hpp>
+
+#endif