Boots – shoes – and leggings
Patent
1990-09-12
1993-04-27
Fleming, Michael R.
Boots, shoes, and leggings
395575, 364DIG2, 3649401, 36494051, 3649314, 36494461, G06F 1314
Patent
active
052069524
ABSTRACT:
A fault tolerant network for a plurality of computers includes a system for controlling access to shared peripherals. Access to the shared peripherals is coordinated among the computers by means of communication through a semaphore box. Each computer connects to the semaphore box via a channel. The semaphore box is comprised of two major sections: a semaphore section and an I/O section. The semaphore section contains two sets of semaphores: a first set comprising reservation semaphores for the shared peripherals; and a second set comprising heartbeat semaphores for the sharing computers. The first set is used to reserve a particular peripheral for a particular computer and indicate the source of the reservation; the second set provides a "heartbeat" to prevent reservation semaphores from being set indefinitely in the event communication with a particular computer is lost.
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Brown Roger G.
Sundet James W.
Chun Debra A.
Cray Research Inc.
Fleming Michael R.
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