Messages in this thread | | | Date | Tue, 10 Jul 2018 17:24:04 +0200 | From | Andrea Parri <> | Subject | Re: [PATCH v2] tools/memory-model: Add extra ordering for locks and remove it for ordinary release/acquire |
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> > ACQUIRE operations include LOCK operations and both smp_load_acquire() > > and smp_cond_acquire() operations. [BTW, the latter was replaced by > > smp_cond_load_acquire() in 1f03e8d2919270 ...] > > > > RELEASE operations include UNLOCK operations and smp_store_release() > > operations. [...] > > > > [...] after an ACQUIRE on a given variable, all memory accesses > > preceding any prior RELEASE on that same variable are guaranteed > > to be visible. > > As far as I can see, these statements remain valid.
Interesting; ;-) What does these statement tells you ;-) when applied to a: and b: below?
a: WRITE_ONCE(x, 1); // "preceding any prior RELEASE..." smp_store_release(&s, 1); smp_load_acquire(&s); b: WRITE_ONCE(y, 1); // "after an ACQUIRE..."
Andrea
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