Dear Boosters,
I'm involved in a bit of a dispute in which a colleague is claiming
that 'volatile' is necessary to make certain synchronization patterns
correct. As part of my response I pointed out that the boost.thread
examples don't use it, but he maintains his position - saying that the
examples are flawed. I'm frankly somewhat out of my element here, and
I'd like to get input from people who have presumably thought about
this stuff a good deal.
The example in question is here, under "synopsis":
http://www.boost.org/doc/libs/1_41_0/doc/html/thread/synchronization.html#thread.synchronization.condvar_ref
The claim is that 'volatile' is needed on the boolean, otherwise the
compiler might cache the boolean in a register, and the loop would
never exit. He cites for support two articles:
http://www.ddj.com/cpp/184403766
https://www.securecoding.cert.org/confluence/display/seccode/DCL17-C.+Beware+of+miscompiled+volatile-qualified+variables
Who's right?
Thanks,
-Gabe
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