* harbour/include/hbatomic.h
+ added support for built in GCC atomic functions: __sync_*()
They are present in GCC >= 4.1 if given CPU supports them. For
x86 CPU family the ones we use need at least i486 CPU. Please make
tests with other CPUs like PPC. If given platform/CPU does not support
them then GCC generate call to function __sync_*_<N>() where <N>
is size of given type used in atomic operation instead of storing
inlined assembler code.
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