It is definitely not easy
Everybody is likely to know that multithreaded apps are very tough to find a bug in. I had the similar opinion but today I had to get into fight with my program that is for school and is to do its job in parallel.
I would have guessed how hard/easy it could be. Hard for that it was very hard to decide where to find to find a defect. On the other side surprisingly easy when I used "couts". Did not have time to look for some debugger (if such one exists and is free). However, using "couts" and grep (first this time I appreciated its qualities) pretty much helped.
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