[Solved] Consider two processes P0 and P1 using Pete... If both processes simultaneously set their flags to true and set turn to the other process, what happens next in terms of entry to the critical section? | Operating Systems

Operating Systems - Critical Section Problem - Requirements & Peterson's Solution

Consider two processes P0 and P1 using Peterson's algorithm. If both processes simultaneously set their flags to true and set turn to the other process, what happens next in terms of entry to the critical section?

ABoth processes enter the critical section simultaneously, causing a race condition

BThe process whose turn variable was set last enters the critical section first

COne process waits while the other enters the critical section, ensuring mutual exclusion

DBoth processes wait indefinitely, causing a deadlock

Step-by-Step Solution

Step 1: Understand Peterson's turn variable role
When both processes set their flags and turn, the turn variable decides who waits.
Step 2: Mutual exclusion enforcement
The process whose turn it is not will wait until the other finishes, ensuring only one enters the critical section.
Step 3: Deadlock and race condition avoidance
Peterson's algorithm prevents both deadlock and simultaneous entry.
Final Answer:
Option C -> Option C
Quick Check:
Mutual exclusion is guaranteed by the turn variable and flags.

Quick Trick: Turn variable breaks ties, ensuring one process waits

Common Mistakes:

MISTAKES

Believing both can enter critical section simultaneously
Thinking the last to set turn always goes first
Assuming deadlock can occur here

Trap Explanation:

PITFALL

Option A is tempting if candidates ignore the turn variable's role. Option B confuses timing with logical control. Option D misinterprets waiting as deadlock.

Interviewer Note:

CONTEXT

Tests understanding of Peterson's algorithm's step-by-step synchronization logic.

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More Operating Systems Quizzes

If both processes simultaneously set their flags to true and set turn to the other process, what happens next in terms of entry to the critical section?

Step 1: Understand Peterson's turn variable role

Step 2: Mutual exclusion enforcement

Step 3: Deadlock and race condition avoidance

Final Answer:

Quick Check:

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