GCC Atomic Operations

Peng Du imdupeng@gmail.com
Mon Feb 22 23:04:00 GMT 2010


Hello, 

I am using GCC Atomic operations, e.g. __sync_bool_compare_and_swap to
do some low level sync stuff. I have the following questions: 

1) are these SMP-safe on x86, i.e. will the result be visible to all
CPUs after applying these functions? 
2) otherwise, does it requires some sort of memory barrier/fence to
flush the result? 
3) do I have to use "volatile" with atomic operations? 


Thank you!








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