CB UNIX

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Columbus UNIX (or CB UNIX) was, according to Marc Rochkind,[1] a variant of the UNIX operating system internal to Bell Labs. It was developed at the Columbus, Ohio branch and was little-known outside the company. CB UNIX was developed to address deficiencies inherent in Research Unix, notably the lack of interprocess communication and file locking, considered essential for a database management system. Several Bell System operation support system products were based on CB UNIX such as Switching Control Center System. The primary innovations were power-fail restart, line disciplines, terminal types, and IPC features similar to System V's messages and shared memory.[2]

Volume 1 and Volume 2 of the UNIX Programmers Manual CB Version

System V IPC

System V IPC, i.e., message queues, semaphores and shared memory were developed together and first appeared in the late 1970s in Columbus UNIX. They eventually appeared on mainstream Unix systems starting with System V in 1983. They were thereafter referred to as System V IPC.[3]

References

  1. ↑ Rochkind, Marc (1985). Advanced UNIX Programming. Prentice Hall. pp. 156–157. ISBN 0-13-011800-1. 
  2. ↑ Dale Dejager (1984-01-16). "UNIX history". net.unix. Web link.
  3. ↑ Kerrisk, Michael (2010). The Linux Programming Interface. No Starch Press. p. 921. 
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