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46 lines
1.0 KiB
Markdown
46 lines
1.0 KiB
Markdown
---
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title: "14-processes-and-system-calls"
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aliases:
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tags:
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- cosc204
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- lecture
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---
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- heirarchical structure in software systems
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- system calls and interrupts
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- representing process in OSs
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- overview of process scheduling
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# Heirarchical structure
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software systems have modularity
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- os kernel
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- system programs
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- applicatioin programs
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## application programs
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Defn: a program that ordinary usrers interact with, running in user space
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e.g.,
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- word processor
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- video player
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- web browser
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- games
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- etc
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## system programs/libraries
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Defn: a program which provides general purpose power level function, packeages in a way which is convenient for a user (e.g., sys admin or programmer) to employ
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system program types include.,
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- file manipulation progarms
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- status info programs
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- network and device management programs
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- compilers assemblers and interpreters
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- various library code
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- command shell programs (e.g., command interpreters)
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also runs in user space
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## system calls
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