On 19/10/17 14:18, Andrew Haley wrote:
On 19/10/17 13:10, Jonathan Wakely wrote:
There are no atomic operations on atomic objects here, so the fence
doesn't synchronize with anything.
Really? This seems rather unhelpful, to say the least.
An atomic release operation X in thread A synchronizes-with an acquire
fence F in thread B, if
there exists an atomic read Y (with any memory order)
Y reads the value written by X (or by the release sequence headed by X)
Y is sequenced-before F in thread B
In this case, all non-atomic and relaxed atomic stores that
happen-before X in thread A will be synchronized-with all non-atomic
and relaxed atomic loads from the same locations made in thread B
after F.
Where is the acquire fence or a load in the example?
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