5.14 Memory Allocation. Suppose there are two operations: request (amount) and release (amount), where amount is a positive integer. When a process calls request, it delays until at least amount free pages of memory are available. A process returns amount pages to the free pool by calling release. Pages may be released in different quantities than they are acquired. (a) Develop a monitor that implements request and release. First specify a global invariant. Do not worry about the order in which requests are serviced. Use the Signal and Continue discipline. (Hint: Use a covering condition.)
5.14 Memory Allocation. Suppose there are two operations: request (amount) and release (amount), where amount is a positive integer. When a process calls request, it delays until at least amount free pages of memory are available. A process returns amount pages to the free pool by calling release. Pages may be released in different quantities than they are acquired. (a) Develop a monitor that implements request and release. First specify a global invariant. Do not worry about the order in which requests are serviced. Use the Signal and Continue discipline. (Hint: Use a covering condition.)
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Hint: The covering condition refers to the single condition variable newPages on which any process must wait when the number of free pages is less than amount.
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