Hydra (operating system)

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HYDRA is an early (now discontinued) capability-based, object-oriented, microkernel designed to support a wide range of possible operating systems to run on top of it.[1] HYDRA was created as part of the C.mmp project at Carnegie-Mellon University in 1971.[2]

The name is based on the ancient Greek mythological creature the hydra.

HYDRA was designed to be modular and secure, and intended to be flexible enough for easy experimentation.[3] The system was implemented in the programming language BLISS.[4]


  1. ^ Wulf 74 pp.337-345
  2. ^ Siewiorek, Daniel P.; Bell, C. Gordon; Newell, Allen; Mashburn, Henry M. (1982), Computer Structures: Principles and Examples, New York, NY: McGraw-Hill
  3. ^ Levy, Henry M. (1984), Capability-Based Computer Systems (PDF), Digital Press
  4. ^ Wulf, William A.; Harbison, Samual P. "Reflections in a pool of processors - An experience report on C.mmp/Hydra" (PDF). p. 945.