Add processes articles #8
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… into c-articles
Updates from mid-July
…ng image and making citation a superscript
jshaffar
reviewed
Sep 20, 2022
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| The easiest way thinking about the problem is to develop a system of **direct execution**, where when a process needs to run, the operating system gives full control of the CPU to that process, and the process executes and eventually gives control of the CPU back to the operating system. Under this scheme, the execution of a program on an operating system using a direct execution model would look like this: | ||
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seems like there needs to be an svg file here :)
jshaffar
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Sep 20, 2022
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| So, whenever a program needs to use a functionality outside of the ones it can directly access, it will make a **syscall**, requesting that the operating system perform some function for it. C programmers may already be familiar syscalls like `read()`, `write()`, `open()`, and `close()`.When a syscall is made, the program gives control of the CPU to the OS and the CPU switches to kernel mode. The OS will then execute the requested instruction, return to user mode, and switch back to the process: | ||
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please add diagram to git
jshaffar
reviewed
Sep 20, 2022
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| The process of an OS choosing to take a process out of its running state is commonly referred to as **preemption**. To enforce preemption, modern CPUs implement a configurable timer that triggers a hardware **interrupt** at regular intervals. This interrupt traps control of the CPU back to the operating system, allowing the operating system to choose whether or not it wants to continue running that process or not: | ||
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| *gif goes here* |
Add architecture articles
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removed mp0
ramyabygari
reviewed
Feb 23, 2023
added 2 commits
February 22, 2023 23:59
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