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Beginner, Intermediate, Expert

Check out this insightful quote from Couchbase CTO Damien Katz:

Threads are hard because, despite being extremely careful, it’s ridiculously easy to code in hard to find, undeterministic, data races and/or deadlocks. That’s why I always model my multi-threaded programs (using the MML, of course) to some extent before I dive into code:

Note that even though I created and evolved (using paygo, of course) the above, one page “agile model” for a program I wrote, I still ended up with an infrequently occurring  data race that took months, yes months, to freakin’ find. The culprit ended up being a data race on the (supposedly) thread-safe DB2 data structure accessed by the AT4, AT6, and AT7 threads. D’oh!

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