MsgSend() in QNX Neutrino does not circumvent the kernel, just the scheduler. If you're clever and lucky you can get an entire round trip to and from the servi

MsgSend() in QNX Neutrino does not circumvent the kernel, just the scheduler. If you're clever and lucky you can get an entire round trip to and from the service in a single timeslice. On the other hand, MsgSend() always blocks, so the call could be preempted depending on service priority or if there is an I/O wait or whatever, and that would mean the scheduler comes to play.