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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. JF Bastien‏ @jfbastien Jul 16

      Such a quaint throwback! 〝volatile: The Multithreaded Programmer's Best Friend〞 — @incomputable I'd forgotten how wild C++ was before C++11. Don't do what the article says! An article from another era. ☺️http://www.drdobbs.com/cpp/volatile-the-multithreaded-programmers-b/184403766 …

      6 replies 2 retweets 20 likes
      Show this thread
    2. John Regehr‏ @johnregehr Jul 16
      Replying to @jfbastien @incomputable

      I think it's 100% clear the C++ committee should remove volatile

      11 replies 1 retweet 8 likes
    3. Rich Felker‏ @RichFelker Jul 16
      Replying to @johnregehr @jfbastien @incomputable

      Then how do you program memory-mapped devices?

      1 reply 0 retweets 2 likes
    4. John Regehr‏ @johnregehr Jul 16
      Replying to @RichFelker @jfbastien @incomputable

      peek and poke (I'm serious, but not about the function names)

      4 replies 0 retweets 3 likes
    5. Rich Felker‏ @RichFelker Jul 16
      Replying to @johnregehr @jfbastien @incomputable

      But you can't implement peek and poke without asm then. The great advancement of mmio was that you *can* write code driving memory-mapped devices purely in C (or C++) without needing hideous inb/outb/inw/outw/etc. asm.

      2 replies 0 retweets 1 like
    6. John Regehr‏ @johnregehr Jul 16
      Replying to @RichFelker @jfbastien @incomputable

      peek and poke are library functions or just use asm. I've written a ton of microcontroller code and there is zero sense in pretending that code accessing memory-mapping i/o is portable

      1 reply 0 retweets 4 likes
      Rich Felker‏ @RichFelker Jul 16
      Replying to @johnregehr @jfbastien @incomputable

      Except all the modern mmio drivers in Linux *just work* on all archs, even ones they were never designed for. Essentially, they *are* portable. This was not the case with old io-insn stuff.

      11:58 AM - 16 Jul 2018
      • 1 Like
      • cleopatraの本玩5566
      2 replies 0 retweets 1 like
        1. New conversation
        2. Rich Felker‏ @RichFelker Jul 16
          Replying to @RichFelker @johnregehr and

          Yes you could achieve the same with peek and poke functions for each bus access size, but unless they were part of the stdlib you'd have all sorts of gratuitous portability problems from ppl implementing their own just for arm and x86.

          1 reply 0 retweets 0 likes
        3. John Regehr‏ @johnregehr Jul 16
          Replying to @RichFelker @jfbastien @incomputable

          maybe we should quibble about a specific piece of code-- do you have one in mind? my guess is that the implementation style is already pretty close to what I want. all I'm really talking about is replacing x = 1 where x is volatile with poke(x, 1).

          3 replies 0 retweets 2 likes
        4. JF Bastien‏ @jfbastien Jul 16
          Replying to @johnregehr @RichFelker @incomputable

          Oooh let's put that on @cpp_rates !

          0 replies 0 retweets 1 like
        5. End of conversation
        1. William D. Jones‏ @cr1901 Jul 16
          Replying to @RichFelker @johnregehr and

          Gonna have to agree w/ Rich on this one. NetBSD does the same thing w/ bus_space_map() and friends; you get an opaque handle that you pass into bus_space_read/write which translates to the actual memory/port-mapped I/O insn.

          0 replies 0 retweets 0 likes
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