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Design and Implementation of a Real-Time Thread Package on Mach Microkernel

We implemented a real-time thread package for users to develop real-time applications. This package supports real-time thread management, periodical scheduling, and the management of priorities and scheduling policies. To solve the problem of priority inversion in RPC, we propose a mechanism of priority hand-out between client threads and server threads. The server thread inherits the client thread’s priority during serving the client thread. Moreover, we also implemented a tool to generate these remote procedure call(RPC) code. Benchmark results show that this environment is more predictable than original C Threads and MIG environment on Mach. It provides better opportunities for real-time applications to meet their deadlines.