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Re: Optimization of conditional access to globals: thread-unsafe?

Erik Trulsson wrote:

Unfortunately it seems that the POSIX standard for threads say that as long
as access to a shared variable is protected by a mutex there is no need to
use 'volatile'.


How does it say this, in some semantically precise way, or with hand
waving as in this sentence.


This means that POSIX essentially defines certain behaviours that the C
standard left undefined.

But does it do so precisely?

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