Computers and Technology, 19.03.2020 18:26 zeezee46
The pseudocode for a bank account supporting concurrent access. Assume that Lock is a valid locking class, although it is not in Java. Since Lock is not reentrant, the code below is broken. Assuming Lock is not reentrant, Please help me to provide a detailed example where the withdraw method would block forever. Refer to locks using the commented operation number. class BankAccount { private int balance = 0; private Lock lk = new Lock(); int getBalance() { lk. acquire(); // Operation 1 int ans = balance; lk. release(); // Operation 2 return ans; } void setBalance(int x) { lk. acquire(); // Operation 3 balance = x; lk. release(); // Operation 4 } void withdraw(int amount) { lk. acquire(); // Operation 5 int b = getBalance(); if (amount > b) { lk. release(); // Operation 6 throw new (); } setBalance(b - amount); lk. release(); // Operation 7 }}
Answers: 2
Computers and Technology, 22.06.2019 05:10, ahoney2233
Suppose we have a byte addressable computer that has a 32-byte cache with 8 bytes per block. the memory address is 8 bits long. the system accesses memory addresses (in hex) in this exact order: 6e, b9, 17, e0, 4e, 4f, 50, 91, a8, ab, ad, 93, and 94. (a) assuming the cache is direct mapped, what memory addresses will be in cache block 2 after the last address has been accessed? (b) assuming the cache is direct mapped, what is the hit ratio for the entire memory reference sequence given, assuming the cache is initially empty? (c) assuming the cache is 2-way set associative with a lru replacement policy, what is the hit ratio?
Answers: 3
Computers and Technology, 22.06.2019 20:00, BreadOfTheBear
What statement best describes operating systems? it’s possible for modern computers to function without operating systems. most operating systems are free or very inexpensive. operating systems are managed by the computer’s microprocessor (cpu). operating systems manage the computer’s random access memory (ram).
Answers: 1
Computers and Technology, 23.06.2019 09:30, blake2001
Which of the following tasks is an audio technician most likely to perform while working on a nature documentary? (select all that apply). eliminating potentially distracting background noise adding sound effects making sure the lighting is adequate for a particular scene changing the narration to better match the mood of the documentary
Answers: 3
The pseudocode for a bank account supporting concurrent access. Assume that Lock is a valid locking...
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