Inside OS/2

What Hacker News says

1. PeterStuerJul 2022
   Gordon Letwin's "Inside OS/2" book from 1988 is still a very accesible intro to operating system design. You can find it free on https://archive.org/details/InsideOS2_201802
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2. timbit42Jul 2022
   See the cover here: https://www.amazon.com/Inside-OS-2-Gordon-Letwin/dp/15561511...
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3. twoodfinFeb 2021
   I doubt it. Since this article predates the Microsoft-IBM split, I figured it was safe to consult my trusty Inside OS/2, by Microsoft’s Gordon Letwin:

   The scheduler's dispatch algorithm is very straightforward: It executes the highest-priority runnable thread for as long as the thread wants the CPU. When that thread gives up the CPU--perhaps by waiting for an I/O operation--that thread is no longer runnable, and the scheduler executes the thread with the highest priority that is runnable. If a blocked thread becomes runnable and it has a higher priority than the thread currently running, the CPU is immediately preempted and assigned to the higher-priority thread. In summary, the CPU is always running the highest-priority runnable thread.

   The scheduler's dispatcher is simplicity itself: It's blindly priority based.

   That doesn’t sound like something that required bodily lifting from a mainframe OS.

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4. twoodfinNov 2013
   Letwin was also the guy for OS/2 on the Microsoft side while the alliance lasted. His Inside OS/2 is a detailed account of trying to squeeze a real multitasking, protected memory OS into a '286:

   http://www.amazon.com/Inside-OS-2-Gordon-Letwin/dp/155615117...

   The cover photo is also classic.

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