LLD - Design — Hotel Booking System
Which code snippet correctly prevents race conditions when booking a test slot?
Which code snippet correctly prevents race conditions when booking a test slot?
easy🧠 Conceptual Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Acquire Lock
Locking the slot ensures no other process can modify availability concurrently.Step 2: Check Availability
Check if the slot is free after acquiring the lock to avoid race conditions.Step 3: Reserve Slot
Reserve the slot only if it is available.Step 4: Release Lock
Release the lock to allow other operations.Final Answer:
def book(slot): acquire_lock(slot) if is_available(slot): reserve(slot) release_lock(slot) -> Option AQuick Check:
Lock before check prevents race conditions [OK]
Quick Trick: Always lock before checking availability [OK]
Common Mistakes:
MISTAKES- Checking availability without locking
- Reserving before checking availability
- Not releasing locks after booking
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