What are the differences between thread-local storage and shared memory?

What are the differences between thread-local storage and shared memory?

Thread-local storage (TLS) allows data to be stored uniquely for each thread, while shared memory is accessible by all threads.

Can you give me an example of when to use each?

Use thread-local storage for data that should not be shared, like user session data. Use shared memory for data that needs to be accessed by multiple threads, like a cache.

What are the performance implications of using each?

Thread-local storage can reduce contention but may increase memory usage. Shared memory can be faster for inter-thread communication but requires synchronization.

Are there any programming languages that handle these differently?

Yes, languages like C++ have built-in support for thread-local storage, while others like Python use libraries for shared memory.