[TUHS] non-blocking IO - threads

[Rob Pike]

To be more forthcoming, there was a long period when the received wisdom
was that threads were unmanageable. But that was a category error: The
programming model in POSIX and others was what made it hard. The
fundamental concepts are a tiny step harder than trivial, and it was not
hard to build a programming model that matched them.

The first mistake people made was to split "thread" from "process". What
those words mean today is not what they meant a generation ago.

For me, it's like the mess sockets made of networking. Our programming
models could be so much simpler than what we are required to deal with.

-rob
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