Assume the Binary Variable Lock Is Initialized to Be 0

question 44

Multiple Choice

Assume the binary variable lock is initialized to be 0, which of the following can be an implementation of the entry section to solve the critical-section problem?

• A) while (compare and swap(&lock, 0, 1) != 0), do nothing;
• B) while (test and set(&lock)), do nothing;
• C) both A and B
• D) none of the above

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