API for detection of multiple CPUs

From: apm (apm35_at_student.open.ac.uk)
Date: 10/28/03 

Date: 28 Oct 2003 00:28:09 -0800

Does anyone know if there is an API for detecting how many CPUs are
present? I am after a way of programmatically determining whether or
not a spinlock could be used in preference to a pthread mutex.

Many thanks,

Andrew Marlow

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