hopefully compile win

db/instance.cpp

@@ -656,7 +656,9 @@ namespace mongo {
         // wait until file preallocation finishes
         // we would only hang here if the file_allocator code generates a
         // synchronous signal, which we don't expect
+#if !defined(_WIN32)
         theFileAllocator().waitUntilFinished();
+#endif
         
         stringstream ss3;
         MemoryMappedFile::closeAllFiles( ss3 );