What is thread pool ?

Question

Can you please explain with examples. Also like to know if all re-entrant code is thread safe.

Answer 1

1. Thread pools are a collection of a certain number of threads that are created and destroyed dynamically as per the load on the server. The thread pool boasts of a minimum number of threads that are active at all times.
2. When the load on the server increases beyond a certain point new threads are instantiated and added to the pool. Any incoming requests are served by threads in the pool that are idle.
3. Advantage : It minimizes the overhead incurred by the server to instantiate new threads and terminating threads when they have serviced a request.
4. Disadvantage : Threads themselves require resources such as memory. If the thread pool size is too large the thread pool puts a load on the machine’s resources.