Follow up, unify boost::thread usage.

src/slic3r/Utils/Thread.hpp

@@ -0,0 +1,28 @@
+#ifndef THREAD_HPP
+#define THREAD_HPP
+
+#include <utility>
+#include <boost/thread.hpp>
+
+namespace Slic3r {
+
+template<class Fn>
+inline boost::thread create_thread(boost::thread::attributes &attrs, Fn &&fn)
+{
+    // Duplicating the stack allocation size of Thread Building Block worker
+    // threads of the thread pool: allocate 4MB on a 64bit system, allocate 2MB
+    // on a 32bit system by default.
+    
+    attrs.set_stack_size((sizeof(void*) == 4) ? (2048 * 1024) : (4096 * 1024));
+    return boost::thread{attrs, std::forward<Fn>(fn)};
+}
+
+template<class Fn> inline boost::thread create_thread(Fn &&fn)
+{
+    boost::thread::attributes attrs;
+    return create_thread(attrs, std::forward<Fn>(fn));    
+}
+
+}
+
+#endif // THREAD_HPP