[Omp] nested parallel region

[DING, Yang]

Dear all,

I am trying to use nested parallel regions with OpenMP but the new
program cannot pass the compilation. Basically, what I want to do is
as following:

#pragma omp sections
{
#pragma omp section
xxxx (serial code here)

#pragma omp section
#pragma omp for
for ()
{
   ...
}
}

However, the compilation is not successful because "pragma for is not
allowed to be nested inside of sections".

Is there any other way to try? I am thinking to use pthread_create
directly instead of parallel sections, for example,

pthread_create(xxxx,...);
#pragma omp for
for ()
{
   ...
}

Will this create any new problems? Or are there better ways to do
this? Thank you for your attention and I appreciate any suggestion.

Many thanks,
Yang