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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> Ehm I was meaning the variable called "nThreads". Just because I saw
> this one as a private variable in the sync() function and I was
> guessing about its value. 

It is initialized in ForceContainer ctor to omp_get_max_threads() value.
Basically you could replace nThreads by omp_get_max_threads()
everywhere, but it would be slower (extra function call every time).

Each thread has its own storage where force can be incremented
independently of other threads; that prevents the necessity of mutual
exclusion. Thread number is found by calling omp_get_thread_num(), which
is guaranteed to be < omp_get_max_threads() == nThreads.

v.