[HN Gopher] Processes and Threads
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       Processes and Threads
        
       Author : ksec
       Score  : 18 points
       Date   : 2025-09-24 16:09 UTC (6 hours ago)
        
 (HTM) web link (planetscale.com)
 (TXT) w3m dump (planetscale.com)
        
       | samlambert wrote:
       | Another Ben Dicken classic
        
         | tanelpoder wrote:
         | Yeah looks like this will be a common theme :-)
        
       | bddicken wrote:
       | Author of the article here. Hope you love it, and I'm hanging
       | around to answer any questions.
        
         | itunpredictable wrote:
         | awesome work, really enjoyed this
        
           | bddicken wrote:
           | Thank you!
        
         | Veserv wrote:
         | A fine introduction, but a few nits.
         | 
         | Similar to how in the "POSIX threads" section you indicate that
         | pthread_create() is UNIX/POSIX-specific, you should probably
         | indicate in the "Creating new Processes" section that fork()
         | and execve() are Unix/POSIX-specific. That, or you could
         | indicate that you are describing generally in that context.
         | 
         | In "Running multiple programs" you state: "After a few seconds,
         | it pauses, saves the state of the RAM, and changes processes."
         | Saying it "saves the state of the RAM" is probably not a good
         | characterization since it is more likely just changing what
         | memory is accessible. It is also, most likely changing the
         | virtual memory mappings to give the illusion of using the same
         | memory addresses (though it does not have to, for instance a
         | system with a MPU still has a concept of distinct programs even
         | though virtual memory mappings are not supported), but you
         | could omit that to the later virtual memory section without
         | being incorrect.
        
           | bddicken wrote:
           | Thanks for the feedback!
           | 
           | Yeah, I purposefully "simplified" how virtual memory works
           | here so that the focus could be on multitasking and context
           | switching, but agree that isn't totally accurate. I actually
           | had hoped to do a part II on virtual memory, but we'll see if
           | time permits that :)
        
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       (page generated 2025-09-24 23:02 UTC)