Consider the Case of a Home Construction Company with Two

question 12

Multiple Choice

Consider the case of a home construction company with two application programs, purchasing (P1) and sales (P2) , which are active at the same time. They each need to access two files, inventory (F1) and suppliers (F2) , to update daily transactions. The following series of events will cause a deadlock. Fill in the missing event in the sequence.
1) Purchasing (P1) accesses the supplier file (F2) .
2) Sales (P2) accesses the inventory file (F1) .
3) Purchasing (P1) doesn't release the supplier file (F2) but requests the inventory file (F1) , but P1 is blocked because F1 is being held by P2.
4) Meanwhile, ____

• A) sales (P2) doesn't release the inventory file (F1) but requests the supplier file (F2)
• B) sales (P2) does release the inventory file (F1) and then requests the supplier file (F2)
• C) purchasing (P1) does release the supplier file (F2) which is then requested by sales (P2)
• D) purchasing (P1) exits

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Definitions:

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