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atomic_ops vs mutex

The following is from the atomic_ops(3) man page:

Because atomic memory operations require expensive
synchronization at the hardware level, applications should take care to
minimize their use.  In certain cases, it may be more appropriate to
use a mutex, especially if more than one memory location will be

I have two questions:

1. Are all atomic_ops functions, or some of them macros?

2. In what cases would it be better to use atomic_ops, instead of
locking and unlocking mutex?

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