naginterfaces.library.omp.get_​thread_​num

naginterfaces.library.omp.get_thread_num()

get_thread_num returns the OpenMP thread number of the calling thread.

For full information please refer to the NAG Library document for x06ad

https://support.nag.com/numeric/nl/nagdoc_30.3/flhtml/x06/x06adf.html

Returns

tnint

The returned OpenMP thread number of the calling thread.

Notes

get_thread_num, for multithreaded implementations, returns the calling OpenMP thread’s unique thread number within the current team. The master thread will always return $0$. The remaining threads will return a value between $1$ and the value returned by get_num_threads() less $1$.

If this function is called from a sequential part of a multithreaded program then it will return the value $0$.

In serial implementations of the NAG Library this function will always return $0$. See the X06 Introduction for a discussion of the behaviour of these functions when called in serial.

References

The OpenMP API Specification for Parallel Programming

Chapman, B, Jost, G and van der Pas, R, 2008, Using OpenMP Portable Shared Memory Parallel Programming, The MIT Press