Lennart Pottering, the pulseaudio developer, has made some interesting observations on emulating atomic operations, using ARMv5 as a running example. Obviously, the post is about architectures who do NOT have hardware support and lack or have minimal kernel support. (However, some Andrew Hayley has noted an obscure kernel API for the purpose). A good read overall.
I don't fully understand the post yet, but I intend to dig deep into this once I get free time.
FYI
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