Functions to easily share data through shared memory (shm_... functions). It is the fastest, and the more econom in memory ( no copy in each process ), way to share informtation between processes. At this moment it only works in asynchronous mode.
The idea is that you have a structure blc_channel which is like a blc_array ( https://framagit.org/blaar/blc_core/blob/master/t_array/main.cpp ) but has a name starting with '/' to identificate it on your system.
