CST 334 Week 1 Journal Entry

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Week 1: Introduction to Operating Systems

One of the main topics that I learned about this week in CST 334 was operating systems and the role they play in running programs. Operation Systems have two main tasks. One of the tasks is to provide an abstraction layer to the user. This layer shields hardware information from the user, as the user should not have access to it. In addition to the layer of abstraction, the operating system also acts as a resource manager. It optimizes the use of the resources in a computer while allocating them to each program in a fair and equitable manner. 

Both of these tasks are completed with the help of two modes provided by the CPU: kernel mode and user mode. While in user mode, the information about the hardware is hidden, and the user is provided an address space to do the intended job. This mode provides the user with access to user, application, and system programs. While in kernel mode, the administor has access to hardware and can change the mode of the CPU. This mode also provides access to system calls which are a set of operations that is provided to application programs from the operating system. 



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