On Mon, 3 Mar 2008, Alan Cox wrote:
> > Atomicity of reads of write for pointers and integral types (other than
> > long long) should be documented.
>
> NAK.
>
> Atomicity of reads or writes for pointers and integral types is NOT
> guaranteed. Gcc doesn't believe in your guarantee.
Miscommunication and lack of clarity. CPU reads and writes _are_
guaranteed to be atomic. What is not guaranteed is that the compiler
will generate a single read or write instruction corresponding to a
particular expression in C.
Consider a routine like the following:
static task_struct *the_task;
void store_task(void)
{
the_task = current;
}
Is it possible to say whether readers examining "the_task" are
guaranteed to see a coherent value?
Alan Stern
_______________________________________________
linux-pm mailing list
linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/linux-pm
