pattern – start thread in constructor#briefly

This is an important element of many concurrency designs.

Q: is it good to instantiate threads in a constructor?
%%A: better be careful. I try to shorten my constructor *call* including any method calls made from my constructor.

Q: is it good practice to start a thread in a constructor?
%%A: i avoid it. On a multi-core machine, the new thread could do any amount of work before the constructor returns. Until then, the half-constructed object is invalid, hazardous and should be untouchable.
%%A: I notice this is fairly common practice.
A: Actually, std::thread ctor “starts” the kernel thread i.e. makes it Eligible to receive time slices.

Q: best practices for writing constructors for a Runnable? should a thread object maintain state — must be initialized


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