openmp/runtime/test/tasking/hidden_helper_task/capacity_nthreads.cpp

   1 // RUN: %libomp-cxx-compile-and-run
   2
   3 #include <omp.h>
   4
   5 #include <algorithm>
   6 #include <cassert>
   7 #include <limits>
   8 #include <vector>
   9
  10 int main(int argc, char *argv[]) {
  11   const int N = std::min(std::max(std::max(32, 4 * omp_get_max_threads()),
  12                                   4 * omp_get_num_procs()),
  13                          std::numeric_limits<int>::max());
  14
  15   std::vector<int> data(N);
  16
  17 #pragma omp parallel for num_threads(N)
  18   for (unsigned i = 0; i < N; ++i) {
  19     data[i] = i;
  20   }
  21
  22 #pragma omp parallel for num_threads(N + 1)
  23   for (unsigned i = 0; i < N; ++i) {
  24     data[i] += i;
  25   }
  26
  27   for (unsigned i = 0; i < N; ++i) {
  28     assert(data[i] == 2 * i);
  29   }
  30
  31   return 0;
  32 }