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Update atomics.md #224

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Nov 1, 2020
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Update atomics.md #224

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7 changes: 4 additions & 3 deletions src/atomics.md
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Expand Up @@ -199,9 +199,10 @@ reordered to occur before it.

When thread A releases a location in memory and then thread B subsequently
acquires *the same* location in memory, causality is established. Every write
that happened before A's release will be observed by B after its acquisition.
However no causality is established with any other threads. Similarly, no
causality is established if A and B access *different* locations in memory.
(including non-atomic and relaxed atomic writes) that happened before A's
release will be observed by B after its acquisition. However no causality is
established with any other threads. Similarly, no causality is established
if A and B access *different* locations in memory.

Basic use of release-acquire is therefore simple: you acquire a location of
memory to begin the critical section, and then release that location to end it.
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