| 1 | // RUN: %libomp-compile-and-run |
|---|---|
| 2 | |
| 3 | #include <stdio.h> |
| 4 | #include <omp.h> |
| 5 | |
| 6 | int test_omp_parallel_num_threads() { |
| 7 | int num_failed; |
| 8 | int threads; |
| 9 | int nthreads; |
| 10 | int max_threads = 0; |
| 11 | |
| 12 | num_failed = 0; |
| 13 | #pragma omp task |
| 14 | {} |
| 15 | |
| 16 | /* first we check how many threads are available */ |
| 17 | #pragma omp parallel |
| 18 | { |
| 19 | #pragma omp task |
| 20 | {} |
| 21 | #pragma omp master |
| 22 | max_threads = omp_get_num_threads(); |
| 23 | } |
| 24 | |
| 25 | /* we increase the number of threads from one to maximum:*/ |
| 26 | for (threads = 1; threads <= max_threads; threads++) { |
| 27 | nthreads = 0; |
| 28 | #pragma omp parallel reduction(+ : num_failed) num_threads(threads) |
| 29 | { |
| 30 | #pragma omp task |
| 31 | {} |
| 32 | num_failed = num_failed + !(threads == omp_get_num_threads()); |
| 33 | #pragma omp atomic |
| 34 | nthreads += 1; |
| 35 | } |
| 36 | num_failed = num_failed + !(nthreads == threads); |
| 37 | } |
| 38 | return (!num_failed); |
| 39 | } |
| 40 | |
| 41 | int main() { |
| 42 | int i; |
| 43 | int num_failed = 0; |
| 44 | |
| 45 | for (i = 0; i < 100; i++) { |
| 46 | if (!test_omp_parallel_num_threads()) { |
| 47 | num_failed++; |
| 48 | } |
| 49 | } |
| 50 | return num_failed; |
| 51 | } |
| 52 |