A micro-kernel for concurrency in C

A micro-kernel that supports concurrent execution of C procedures within a single user process is described. A micro-kernel provides only four primitives, which have been used to build a number of higher-level abstractions, including support for distributed processing. The micro-kernel differs from other efforts in that it is small and efficient, it is written entirely as a non-privileged user program, and it provides fine-grained unpredictable interleaving of execution.