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GCC Atomic Operations
- From: Peng Du <imdupeng at gmail dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Mon, 22 Feb 2010 15:00:57 -0600
- Subject: GCC Atomic Operations
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!