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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Beast‏ @beast_pixels Jul 20
      Replying to @cmuratori

      Kinda weird, since one would expect the C-runtime be as low level as it gets. Heck, most software makes this assumption, so that has such a huge negative impact on the whole industry.

      1 reply 0 retweets 3 likes
    2. Casey Muratori‏ @cmuratori Jul 20
      Replying to @beast_pixels

      The C runtime is not low-level at all. I'm not sure why anyone would think that?

      5 replies 0 retweets 12 likes
    3. вячесλав (◕‿◕✿) ヴャチェスラーフ‏ @JustSlavic Jul 20
      Replying to @cmuratori @beast_pixels

      I have never seen software NOT using the C runtime library. I thought that you cannot ship a program without it. For example, I thought malloc is the only way to allocate memory, and every program has to call it (calloc and new call it too, right?)

      1 reply 0 retweets 3 likes
    4. Casey Muratori‏ @cmuratori Jul 20
      Replying to @JustSlavic @beast_pixels

      malloc does not map memory. It is just a sub-allocator that sits on top of the OS's memory map, which you can instead just call directly. You call VirtualAlloc on Windows or mmap on Linux. For example, in the refterm stuff I just posted:https://github.com/cmuratori/refterm/blob/91e932f011e12c02a6c609ac59570f5c19fe4727/refterm_example_terminal.c#L6 …

      1 reply 0 retweets 16 likes
    5. Casey Muratori‏ @cmuratori Jul 20
      Replying to @cmuratori @JustSlavic @beast_pixels

      Furthermore, the CRT actually doesn't give you access to the powerful memory mapping features of your OS. Again, in refterm, here is a circular buffer implemented entirely with OS allocation calls:https://github.com/cmuratori/refterm/blob/91e932f011e12c02a6c609ac59570f5c19fe4727/refterm_example_source_buffer.c#L15 …

      2 replies 2 retweets 16 likes
    6. Casey Muratori‏ @cmuratori Jul 20
      Replying to @cmuratori @JustSlavic @beast_pixels

      That small set of calls is all you need for a circular buffer that works "automatically" - meaning that you never need to check where you are in the buffer, because the memory is mapped twice, so reading off the end of the buffer just reads the beginning of the buffer.

      1 reply 1 retweet 13 likes
    7. Casey Muratori‏ @cmuratori Jul 20
      Replying to @cmuratori @JustSlavic @beast_pixels

      This is all stuff that the CPU does automatically for you, but which people don't realize you can do because of libraries like the CRT which were written for the lowest common denominator (eg., chips with no MMU).

      1 reply 0 retweets 12 likes
    8. Beast‏ @beast_pixels Jul 20
      Replying to @cmuratori @JustSlavic

      Well, holy shit. This is quite the revelation.

      1 reply 0 retweets 6 likes
    9. Casey Muratori‏ @cmuratori Jul 20
      Replying to @beast_pixels @JustSlavic

      Now I am wondering what people thought malloc was doing :) If you didn't know it called the OS to change the virtual memory mapping for your process, what _did_ you think it was doing?

      3 replies 0 retweets 6 likes
    10. Beast‏ @beast_pixels Jul 20
      Replying to @cmuratori @JustSlavic

      Basically the assumption was: - The OS provides the C runtime which implements the most efficient and low level routines necessary for programs to work. - The OS provides their own API on top of it, which provides _higher level_ features than the C runtime.

      1 reply 0 retweets 8 likes
      Casey Muratori‏ @cmuratori Jul 20
      Replying to @beast_pixels @JustSlavic

      Whoa! OK. Well, that makes sense. That's not what happens, but I can see why people might think that.

      1:54 PM - 20 Jul 2021
      • 7 Likes
      • Felix Eisenkolb Ian Moody Hang Yang bernie wick Ivan Braidi Adam Rezich
      0 replies 0 retweets 7 likes

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