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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
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. 

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.)
Transcribed Image Text: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.)
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