, for multithreaded implementations, returns the number of OpenMP threads in the current team. If the number of threads is deemed critical then you are advised to use x06abc
to retrieve this value as it may be less than that requested with either a call to x06aac
, your OMP_NUM_THREADS environment variable value or by using a num_threads
clause on an OpenMP parallel
The number of threads actually in use in a parallel region is dependent on several factors. Please refer to Section 4
for a full description of how the number of threads is chosen for a particular parallel region.
If this function is called from a sequential part of a multithreaded program then it will return the value .
In serial implementations of the NAG Library this function will always return
. See the X06 Chapter Introduction
for a discussion of the behaviour of these functions when called in serial.
Background information to multithreading can be found in the Multithreading
for a demonstration of how to use x06abc