open mp troubles

[burnt water]

Why is only 1 thread active at a time in this function?

int isprime( mpz_t x )
{
int i = 1;
int h;
mpz_t max;
mpz_t mod;
mpz_t loop;
mpz_init_set_d( loop, 2 );
mpz_init( mod );
mpz_init( max );
mpz_sqrt( max, x );
mpz_mod( mod, x, loop );
printf("\n%d ", n );
if( mpz_cmp_d( mod, 0 ) == 0 ) { //handles check for n=2;
gmp_printf( "%Zd was not prime:", x );
return 0;
}
mpz_set_ui( loop, 3 );
omp_set_num_threads(threads);
#pragma omp parallel
{
#pragma omp for schedule(dynamic,chunk) nowait

for( h = 0; mpz_cmp( max, loop ) >= 0; mpz_add_ui( loop, loop, 2 ) ) {
GPTLstart("prime");
mpz_mod( mod, x, loop );
if( mpz_cmp_d( mod, 0 ) == 0 ) {
gmp_printf( "%Zd was not prime:", x );
i = 0;
break;
}
GPTLstop("prime");
}

}

return i;
}

[MadCow108]

a for loop must have a single exit in openmp.
so you can't use break in the loop
actually it shouldn't even compile. Are you sure your compiling with -fopenmp?

also is the chunksize defined?
(and use code tags to post sourcecode)