Hydra (operating system)

Hydra
Developer	Carnegie-Mellon University
Written in	BLISS
OS family	Capability-based
Working state	Discontinued
Initial release	1971; 53 years ago
Yes\|Final release\|Latest release}}	Final / 1975; 49 years ago
Marketing target	Research
Available in	English
Update method	Compile from source code
Kernel type	Microkernel
Default user interface	Command-line interface

Hydra (stylized as HYDRA) is an early, discontinued, capability-based, object-oriented microkernel designed to support a wide range of possible operating systems to run on 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]

References

↑ Wulf 74 pp. 337–345
↑ Computer Structures: Principles and Examples. New York, New York: McGraw-Hill. 1982. http://research.microsoft.com/users/gbell/Computer_Structures_Principles_and_Examples/csp0366.htm.
↑ Levy, Henry M. (1984). Capability-Based Computer Systems. Digital Press. http://www.cs.washington.edu/homes/levy/capabook/Chapter6.pdf.
↑ Wulf, William A.; Harbison, Samual P.. Reflections in a pool of processors: An experience report on C.mmp/Hydra (Report). p. 945. http://www.cs.auckland.ac.nz/compsci703s1c/resources/WulfHarbison.pdf.

Levin, R.; Cohen, E.; Corwin, W.; Pollack, F.; Wulf, William (November 1, 1975). "Policy/mechanism separation in Hydra". Proceedings of the fifth ACM symposium on operating systems principles. pp. 132–140. doi:10.1145/800213.806531.
Wulf, William; Cohen, E.; Corwin, W.; Jones, A.; Levin, R.; Pierson, C.; Pollack, F. (June 1974). Hydra: The Kernel of a Multiprocessor Operating System. 17. pp. 337–345. doi:10.1145/355616.364017. https://dl.acm.org/doi/10.1145/355616.364017.

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[Wulf74-1] Wulf 74 pp. 337–345

[2] Computer Structures: Principles and Examples. New York, New York: McGraw-Hill. 1982. http://research.microsoft.com/users/gbell/Computer_Structures_Principles_and_Examples/csp0366.htm.

[3] Levy, Henry M. (1984). Capability-Based Computer Systems. Digital Press. http://www.cs.washington.edu/homes/levy/capabook/Chapter6.pdf.

[4] Wulf, William A.; Harbison, Samual P.. Reflections in a pool of processors: An experience report on C.mmp/Hydra (Report). p. 945. http://www.cs.auckland.ac.nz/compsci703s1c/resources/WulfHarbison.pdf.

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v t e Object-capability security
Concepts	Principle of least authority (POLA) Confused deputy problem Ambient authority File descriptor C-list Object-capability model Capability-based security Capability-based addressing Zooko's triangle Petnames
OS kernels	Hydra NLTSS KeyKOS EROS CapROS iMAX 432 Midori seL4 Genode Fuchsia
Programming languages	Joule E Joe-E Cajita
Filesystems	Tahoe-LAFS
Specialised hardware	Plessey System 250 Cambridge CAP IBM System/38 Intel iAPX 432

Hydra (operating system)

Topic: Software

References