HP aC++/HP C A.06.20 Programmer's Guide

is the maximum number of threads that will be used. This function has effect only
when called from serial portions of the program. If it is called from a portion of the
program where the omp_in_parallel function returns non-zero, the behavior of this
function is undefined.
For more information on this subject, see the omp_set_dynamic and omp_get_dynamic
functions. This call has precedence over the OMP_NUM_THREADS environment variable.
omp_get_num_threads
#include <omp.h>
int omp_get_num_threads(void);
The omp_get_num_threads function returns the number of threads currently in the
team executing the parallel region from which it is called. The omp_set_num_threads
function and the OMP_NUM_THREADS environment variable control the number of
threads in a team. If the number of threads has not been explicitly set by the user, the
default is implementation dependent. This function binds to the closest enclosing
parallel directive. If called from a serial portion of a program, or from a nested parallel
region that is serialized, this function returns 1.
omp_get_max_threads
#include <omp.h>
int omp_get_max_threads(void);
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.
omp_get_thread_num
#include <omp.h>
int omp_get_thread_num(void);
The omp_get_thread_num function returns the thread number, within its team, of
the thread executing the function. The thread number lies between 0 and
omp_get_num_threads -1, inclusive. The master thread of the team is thread 0. If
called from a serial region, omp_get_thread_num returns 0. If called from within a
nested parallel region that is serialized, this function returns 0.
omp_get_num_procs
#include <omp.h>
int omp_get_num_procs(void);
The omp_get_num_procs function returns the number of processors that are available
to the program at the time the function is called.
222 Exception Handling