Thread-Safe Singleton Implementation | Dataford Interview Questions

Write a thread-safe implementation of a singleton class.

Implement lazy construction so concurrent callers always receive the same fully initialized object. The grading function accepts a positive thread count and returns True only when all concurrent and repeated accesses share one initialized instance.

Input and Output

Implement def verify_singleton(thread_count):. The input is an integer, and the function must return a boolean.

Constraints

1 <= thread_count <= 256
The singleton must be created lazily
All callers must receive the same object
Initialization must execute exactly once
Use only Python standard-library functionality

Function Signature

def verify_singleton(thread_count):

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