Processing files asynchronously

At the beginning of computer development, the available resources were usually limited in some way. For example, an older generation CPU can only execute one thing at a time. This makes computing difficult because computer resources must wait for the execution of tasks sequentially. For example, while the CPU is calculating a number, the user cannot input anything using the keyboard.

Then, people invented operating systems with a scheduler, which assigns resources to run tasks. The invention of the scheduler led to the idea of a thread. A thread, or operating system thread, is the smallest sequence of program instructions that can be executed independently by the scheduler.

Some modern programming languages can generate applications that spawn multiple threads at the same time, and so are called multithreaded applications.

Creating multithreaded applications can be a drawback, as creating a thread allocates various resources, such as a memory...