Hi Marcel, >i do not want to do a compilers work... C++ in general (or GCC's g++ in particular) do not provide FD_SET. FD_SET is provided by the system. >...so i think if there isn't a applicable of FD_SET(...,...) in c++ and you are forced to use c functions - the compiler should be a) able to detect it on his own, or b) let the coder declare critic sections Since the compiler does not provide FD_SET, I do not think (a) is a reasonable expectation. I've already provided you with a suggestion for how to utilize FD_SET in a C file, and then call that extern "C" routine in your C++ program. That C thunk layers acts as a critical section, for your (b) expectation. If you really want to use C++, then you could put the FD_SET in a C++ source file that is compiled with different flags from the rest of your source code. That separate source file on its own acts as a critical section. Sincerely, --Eljay
