7.1. Processes and Threads

Process is the name given to a particular instance or context of an executable in the operating system. The processors of a system execute the instructions contained within a process context. There can be multiple processes in varying states of completion running on the processors of a system. Processes have been the basic executable unit of work since the beginning of Unix in the 1970s. Each process under HP-UX uses various types of memory regions, such as:

  • text (executable code)

  • data (private global data such as globals and BSS area, stack, heap, etc.)

  • shared libraries (code)

  • shared memory (data)

  • memory-mapped files

See Chapter 8, “Memory Bottlenecks” on page 203 for additional information about how a process uses memory. ...

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