21 Interrupts and Exceptions
Thus far, we’ve viewed each application as having exclusive use of the computer. But like most operating systems, Linux allows multiple applications to be executing concurrently. The operating system manages the hardware in an interleaved fashion, providing each application, and the operating system itself, with the use of the hardware components it needs at any given time.
There are two issues here. First, for the operating system to carry out its management tasks, it needs to maintain control over the interaction between applications and hardware. It does this by using a system of privilege levels in the CPU ...
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