3.1.3 omp_get_max_threads Function

The omp_get_max_threads function returns an integer that is guaranteed to be at least as large as the number of threads that would be used to form a team if a parallel region without a num_threads clause were to be encountered at that point in the code. The format is as follows:

#include <omp.h>
int omp_get_max_threads(void);

The following expresses a lower bound on the value of omp_get_max_threads:

threads-used-for-next-team <= omp_get_max_threads

Note that if a subsequent parallel region uses the num_threads clause to request a specific number of threads, the guarantee on the lower bound of the result of omp_get_max_threads no long holds.

The omp_get_max_threads function's return value can be used to dynamically allocate sufficient storage for all threads in the team formed at the subsequent parallel region.

Cross References:

• omp_get_num_threads function, see Section 3.1.2 on page 37.

• omp_set_num_threads function, see Section 3.1.1 on page 36.

• omp_set_dynamic function, see Section 3.1.7 on page 39.

• num_threads clause, see Section 2.3 on page 8.