Threading Introduction :



At some point of time in the past, the common computer had only one computing unit and could not execute several computing tasks simultaneously. However, operating systems could already work with multiple programs simultaneously, implementing the concept of multitasking. To prevent the possibility of one program taking control of the CPU, forever casuing other applications and the operating system itself to hang, the operating systems had to split a physical computing unit across a few virtualized processors in some way and give a certain amount of computing power to each executing program. Moreover, an operating system must always have priority access to the CPU and should be able to prioritize CPU access to different programs. Moreover, an operation system must always have priority access to the CPU and should able to prioritize CPU access to different programs. A thread is an implementation of this concept. It could be considered a virtual processor given to the one specific program that runs it indenpendently.

Therefore, while it was possible to enchance computer processors, making them execute more and more commands per second, working with threads was usually an operating system task. There was no sense in trying to compute some tasks in parallel on a single-core CPU because it would take more time than running those computations sequentially. However, when processors started to have more computing cores, older programs could not take advantage of this because they just used one processor core.

To use a modern processor's computing power effectively, it is very important to be able to compose program in a way that it can use more than one computing core, which leads to organizing it as several thread communicating and synchronizing with each other.