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HP-UX 11i Internals by Chris Moore, Chris Cooper

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The Players

There was a time when the process was the smallest schedulable entity of concern to the kernel; today, however, that honor belongs to the thread. Before we discuss HP-UX kernel structures in depth, we must define the relationship between programs, processes, and threads.

The Program

The term program refers to a file that stores an executable image. A program file contains a header record defining the architecture for which it was compiled, magic numbers, and a list of system resources it will require access to during its execution life cycle.

The first HP series 800 computers were based on the then newly developed 32-bit HP Precision Architecture (PA-RISC 1.x) chip set. This product line was called the Spectrum computing platform. ...

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