How to make two processes write on the same NamedPipe?

Question

So, the profiler is written in c++ and is launched by the CLR automatically when the process to be profiled is launched. The process then launches another application (the main target of profiling). Profiler is launched for this process also. All this is taken care of, but the problem is: Only one of these two profilers can communicate with the front end application via NamedPipe. I need both the profilers to write on the same pipe so that the front end application remains straight-forward and simple. Is this possible using some kind of semaphore to ensure that one of the processes write to the pipe at one time? I use the CreateFile() function to open the pipe in the profiler.