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+ parallelism == physically running few tasks on different cpu cores
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+ let's go with that then 
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+ do we have anyone who's played around with threads and parallelism here?
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+ Hello
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+ Distinguishing between Parallelism and Concurrency is extremely important to do. They are orthogonal concepts.
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+ Concurrency is about dealing with lots of things at once.
+Parallelism is about doing loads of things at once.
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+ @jfs I think you meant @NWDD but I can answer too first of all, I think thread safety can be many different things. You meantioned preemption, that's one part of it -- if you only have 1 CPU and you fully control when the next thread executes, then you can be a lot more relaxed about a lot of things, since you know no other CPU will be able to access your variables concurrently. in other words, you don't need locking at all.
+
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+ first of all, I think thread safety can be many different things. You meantioned preemption, that's one part of it -- if you only have 1 CPU and you fully control when the next thread executes, then you can be a lot more relaxed about a lot of things, since you know no other CPU will be able to access your variables concurrently. in other words, you don't need locking at all.
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+ Now I have the definitions done and over with, let's gone down the dirty stuff 
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+ I would like to state that synchronization is needed whenever two processes (in the sense of @gingerBill 's definition) communicate. Where communication means any kind of information sharing
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+ @NWDD are you saying you don't think coroutines or green threads are ever interesting, or that they're only interesting if you can (also) schedule them in parallel?
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+ coroutines are great (obviously mandatory everything I say is my opinion and not a fact blablablablabla)
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+ Like when your older brother hogs the controller and you have to get your mom to do some preemption.
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+ it's kind of easier describing a transition like "change opacity during X time, then change scene, then change opacity during X time" than pretty much any other alternative
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+ 1
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+ there are so many concepts and nuances to this whole parallel/concurrent thing would be cool to have an infographic or something relating all the terms to each other
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+ would be cool to have an infographic or something relating all the terms to each other
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+ basically I'm thinking of fibers
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+ Exactly!
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+ a 64-byte game? 
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+ just saying that not being cache friendly (when doing multithreaded stuff) isn't related to using a huge amount of memory or optimizing
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+ @jfs I was about to say that the message-based models may still require "locks" of some sort, but they are not explicitly handled by the user.
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+ So the model difference is if the locking is implicit or explicit.
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+ yes, couldn't think of a practical example without adding ->1 
(in the last example I was thinking about a matchmaking server)
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+ (in the last example I was thinking about a matchmaking server)
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+ I ask because I know that there's tons of bug potential once you start doing things concurrently. I had a good time a while ago going through this thing: https://deadlockempire.github.io/
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+ A race condition that happened in a non-parallel situation of a so-called "safe" programming language (C#) in a game that was more or less ECS-based, where a system removed the "rigidbody" component in a very specific (user-triggered) situation.
+There was a separate system which worked like a finite-state-machine that was being updated every few frames.
+If during a transition between two states the rigidbody got removed, the thread that was running the logic crashed and the C# runtime for the target platform would silently swallow the exception freezing the game (without providing any crash-dump or useful information)
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+ What's the worst concurrency bug you've all encountered?
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+ I'm back, female canines!
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+ 3
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+ so what 
️ stuff do you have for us
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+ ️ stuff do you have for us
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+ Another fun fact, CSP is effectively UNIX Pipes applied to the program level
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+ k continue
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+ apparently Go is not an example, by @gingerBill 's definition
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