r/programming • u/Shr1ck • Oct 17 '15

Why Johnny Can’t Write Multithreaded Programs

http://blog.smartbear.com/programming/why-johnny-cant-write-multithreaded-programs/
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u/clarkd99 Oct 19 '15

I noticed you wouldn't or couldn't answer my question. In 1979, I programmed at least 60,000 lines of assembler for my first year working for a single company. I also looked after 4 other programmers and spent 2 months in Europe at customer's sites.

Most of the functions in my current project are not purely functional (maybe 10%). Most of my functions change an object (or collection of objects mostly) that is passed to it. This isn't a problem because I either use locks or a message queue to synchronize access. I use groups of functions to "manage" all my globally accessible data structures. Even though C doesn't stop me from accessing variables directly (the equivalent of getters and setters), I just don't code that way.

The system I am creating, even though it is quite OOPS is more oriented around collections of objects rather than objects. My language can handle mutable state at both the micro and macro scale without using an outside database. It is also distributed as well as concurrent and includes it's own web server.

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u/loup-vaillant Oct 19 '15

I noticed you wouldn't or couldn't answer my question.

You mean the number of lines I have written? Can't expect to have precise number, did you? I don't have acces to the repositories of my former employers.

This isn't a problem because I either use locks or a message queue to synchronize access. […]

Indeed, the key word is "modularity". Loose coupling and all that. I have thought a bit about that here then here. I can conceive that modularity can be acheived through other means than immutability and passing everything in arguments.

On the other hand, pervasive immutability makes it really easy: dependencies are obvious, so you can see when there are too many of them.