Support interprocess communication perimeter

[HadrienG2]

Sometimes, it makes sense to implement the client and the server of an asynchronous operation in different OS processes. Although shared-memory communication can still easily be used, the interprocess communication setting still has a number of unique points that should be carefully considered:

• Processes can crash independently and should tolerate each other's failure
• Processes live in separate address spaces, so pointers should be used sparingly in communication
• Processes are isolated from each other for a reason, security considerations should be examined
• Interprocess signaling is more complex and less efficient than thread signaling