What happens if an application is closed while a thread of ThreadPool is writing a file?

Question

Suppose you use a ThreadPool to perform some operations and assume that each operation writes on a file. All threads of ThreadPool are background threads, so they will be terminated when closing the application. What happens if the application is closed while a thread of ThreadPool is writing a file to disk?

Answer 1

Operating system will close the file handle as the part of terminating the process.

• Any pending asynchronous I/O will be canceled
• Any data in the write buffer which isn't flushed gets lost