get current core id

[fozzie]

hi all..

Does anyone know if it is possible to get the ID of the core which is
executing code at a given point in a C++ program? I'm running code built
using gcc 4.4.1 on Ubuntu Koala 64-bit with an Intel core 2 quad and would
like to see whether external code calling a function in a shared library is
making use of multiple cores.

thanks!
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