gcov & OpenMP

[David Berg]

I'm trying to familiarize myself with using gcov to analyze an OpenMP
program. I've written a simple/trivial program to create 4 threads,
print the number of threads and return.

*****************************************************
#include  "omp.h"
#include  "stdio.h"

int  main()  {

#pragma  omp parallel num_threads(4)
     printf("Threads: %d\n",  omp_get_num_threads());

     return  0;
}
******************************************************


When I run  "gcc-fprofile-arcs-fopenmp-ftest-coverage test2.c && 
./a.out &&  gcov test2.c&&  grep[56]:  test2.c.gcov"  to see how many 
times lines are executed I find that gcov reports |#pragma| line is run 
between 3 and 5 times and the |printf| line is run
one less time than the |#pragma|. However, "Threads: 4" is always
printed 4 times.

If this is a bug I'll gladly report it. If not, can you explain why this 
is happening so I can understand the results of more complicated programs?

Thank you.

--
David Berg


-- 
--Dave