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日期:2025-04-29
前一章 | 首頁 | 下一章 Deadlock Def.( ) 成立的四個必要條件( ) 與starvation比較( ) 死結處理方式 Deadlock Prevention( ) Deadlock Avoidance(Banker's Algo.)( ) Deadlock Detection(Algo.) & Recovery( ) 相關圖形...
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日期:2025-05-02
Necessary and Sufficient Deadlock Conditions Coffman (1971) identified four (4) conditions that must hold simultaneously for there to be a deadlock. 1. Mutual Exclusion Condition The resources involved are non-shareable. Explanation: At least one resource...
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日期:2025-04-27
(regenerated from [OSC] Fig. 7.5 on p. 295) If a resource allocation graph contains no cycles, then no process is deadlocked. If a resource allocation graph contains a cycle, then a deadlock may exist. Therefore, a cycle means deadlock is possible, but no...
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日期:2025-05-04
After a few seconds, each of the philosophers becomes hungry and grabs a single fork. Since no more forks are available and two forks are required for eating, the philosophers all wait for another fork and deadlock occurs. Note that the Dining ......
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日期:2025-04-29
In the single resource instance case, circle in RAG is both a necessary and a sufficient condition. Note that the algorithm, to detect a cycle in a graph, requires an order of n2 operations, where n is the number of vertices in the graph. • When resource ...
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日期:2025-05-02
Deadlock - Killing Blocked Process we have tables that load overnight. Sometimes a user will try to run a query up against that table while the table is loading and a deadlock occurs. I do not notice this until I get into the office. By this time many tab...
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日期:2025-05-02
Multithreading offers lots of benefits, but it's not a technique you can employ willy nilly without first learning about all the potential pitfalls. To get you started, Vance Morrison covers multithreading and the shared memory threading model, race condi...
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日期:2025-04-29
The database system's schedule at a certain point in time is the following: (also is possible) holds a read-lock on x and holds read-locks on y. Thus and are blocked by the lock compatibility rules of SS2PL and cannot be executed. This is a distributed de...