Explain the Unix kernel.

1.	Explain the Unix kernel.
Answer» The operating system's central core is the UNIX kernel. It CONNECTS to the hardware DEVICES, as WELL as to the processor, memory, and I/O management. Users' requests are managed by the kernel using system CALLS that move the process from user space to kernel space. A context switch occurs every time a user process performs a system call, such as read(), fork(), exec(), open(), and so on. A context switch is a mechanism that allows a process to change its state. The process can either be blocked until the system call is completed, or it can continue and be told of the COMPLETION of the system call via a signal (nonblocking).

Answer»

The operating system's central core is the UNIX kernel. It CONNECTS to the hardware DEVICES, as WELL as to the processor, memory, and I/O management. Users' requests are managed by the kernel using system CALLS that move the process from user space to kernel space.

A context switch occurs every time a user process performs a system call, such as read(), fork(), exec(), open(), and so on. A context switch is a mechanism that allows a process to change its state. The process can either be blocked until the system call is completed, or it can continue and be told of the COMPLETION of the system call via a signal (nonblocking).

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