In “Synchronization in a Parallel-Accessed Data Base” [Comm. ACM 12, 11 (Nov. 1969), 604-607] A. Shoshani and A. J. Bernstein have given a very lucid synthesis of diverse techniques to assure the integrity of a data base. But it appears that one of the factors in the synthesis, the entry hold count, will prevent the return of a node to the free list in precisely those circumstances for which they invoked the facility.
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