midConcurrency
What is an ExecutorService / Thread Pool?
Updated Apr 28, 2026
Short answer
A pattern for managing a collection of reusable threads to execute tasks, avoiding the overhead of creating new threads for every request.
Deep explanation
Mid-level concurrency focuses on coordination patterns. The goal is to move beyond simple 'locks' and use high-level abstractions provided by the language or framework (like Thread Pools) to ensure scalability.
Real-world example
A database connection pool limiting the number of simultaneous connections to 20.
Common mistakes
- Using a heavy Mutex for a scenario where 99% of operations are Reads.
Follow-up questions
- What is the 'Condition' variable in a lock?