IOS development-multi-Thread programming technology (Thread, Cocoa operations, GCD), multi-Thread programming cocoa
Multi-threaded programming is widely used in software development. I believe that multi-threaded tasks are no longer unfamiliar to us. With multithreading technology, we can do multiple things, rather than one task at a time. For example, frontend and backend interaction, large tasks (time and resources required), and so on. That is to say, we can use threads to place tasks that take up a long time in the background for processing without affecting user usage.
Every program running on the system is a process. Each process contains one or more threads. The process may also be a dynamic execution of the entire program or some programs. A thread is a set of commands or special segments of a program. It can be executed independently in the program. It can also be understood as the context of code execution. Therefore, a thread is basically a Lightweight Process, which is responsible for executing multiple tasks in a single program. Generally, the operating system is responsible for scheduling and execution of multiple threads.