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Re:Rethinking the D-Bus Message Bus by eschaton on Wednesday August 23, 2017 @02:33PM (#15083919)
This is basically Mach.
Re:Rethinking the D-Bus Message Bus by Animats on Wednesday August 23, 2017 @02:42PM (#15083986)
No, Mach used unidirectional messaging. There was an RPC system, but it came with some formatting and marshalling stuff. Not sure about MacOS. Apple has an explanation of the five or so IPC mechanisms they ended up with.[1]

[1] https://developer.apple.com/library/content/documentation/Da...