using_threads(3P) Sun Performance Library using_threads(3P)NAMEusing_threads - In a parallel environment, if called from a serial
region of the master thread it returns the number of threads available
for execution (determined by function OMP_GET_NUM_THREADS). Else, if
it is called from a thread in the team executing the parallel region it
returns a 1.
USING_THREADS subroutine
SYNOPSIS
INTEGER FUNCTION USING_THREADS()
INTEGER*8 FUNCTION USING_THREADS_64()
F95 INTERFACE
INTEGER FUNCTION USING_THREADS()INTEGER(8) FUNCTION USING_THREADS_64()
C INTERFACE
#include <sunperf.h>
int using_threads();
long using_threads_64();
PURPOSE
In a parallel environment, if called from a serial region of the master
thread USING_THREADS returns the number of threads available for execuâ
tion. This number is determined by function call OMP_GET_NUM_THREADS
(See the specifications for the OpenMP Fortran Application Program
Interface at http://www.openmp.org for more details on
OMP_GET_NUM_THREADS). Else, if it is called from a thread in the team
executing the parallel region, it returns a 1. A user routine can call
using_threads to determine if it is already in a parallel region. If
this is the case, a 1 is returned and the routine can choose the serial
path instead of going parallel, thus avoiding nested parallellism.
6 Mar 2009 using_threads(3P)
