The C++ runtime functions new, delete, try, catch, and throw are threadsafe.
Not all C++ library functions are threadsafe. Before calling your existing C applications in a multithread-capable job, refer to the WebSphere® Development Studio: ILE C/C++ Programmer's Guide, SC09-2712 PDF and WebSphere Development Studio: C/C++ Language Reference, SC09-4815 PDF to determine whether all of your functions are threadsafe.