diff --git a/log.cpp b/log.cpp
new file mode 100644
index 0000000..a437d18
--- /dev/null
+++ b/log.cpp
@@ -0,0 +1,22 @@
+#include <string>
+using namespace std;
+
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#include <pthread.h>
+#endif
+
+
+string _log_whichThread()
+{
+	char buff[32] = { 0 };
+#ifdef _WIN32
+	sprintf(buff, "%ul", GetCurrentThreadId()); // DWORD
+#else
+	sprintf(buff, "%ul", pthread_self());
+#endif
+	string ans("Thread ");
+	ans.append(buff);
+	return ans;
+}