Regarding details of MPI functions

[Kanak Lohiya]

Dear all,
I have been trying to find the detailed code for the functions
messgae_port_register_in, message_port_register_out, message_port_pub etc.
but not able to find it. I have checked the source code file of
block_block.h where these functions are defined as void and have arguments
but no code is written on how these work?
Thanks and regards