The Interprocess Communication of MACH Kernel

Mach is an object-oriented operating system. Mach kernel supports five primitives: task, thread, memory object, port and message. The interprocess communication of Mach kernel is capability based and message-oriented. All of the operations on tasks, threads and memory objects in applications are manipulated with messages, to and from ports. The communication between threads or tasks is supported by the primitives of Mach IPC. This paper describes the basic concepts of Mach IPC and the operations of message passing.