| // RUN: %libomp-compile-and-run |
| #include <stdio.h> |
| #include "omp_testsuite.h" |
| |
| /* |
| * This test will hang if the nowait is not working properly |
| * |
| * It relies on a thread skipping to the second sections construct to |
| * release the threads in the first sections construct |
| * |
| * Also, since scheduling of sections is implementation defined, it is |
| * necessary to have all four sections in the second sections construct |
| * release the threads since we can't guarantee which section a single thread |
| * will execute. |
| */ |
| volatile int release; |
| volatile int count; |
| |
| void wait_for_release_then_increment(int rank) |
| { |
| fprintf(stderr, "Thread nr %d enters first section" |
| " and waits.\n", rank); |
| while (release == 0); |
| #pragma omp atomic |
| count++; |
| } |
| |
| void release_and_increment(int rank) |
| { |
| fprintf(stderr, "Thread nr %d sets release to 1\n", rank); |
| release = 1; |
| #pragma omp flush(release) |
| #pragma omp atomic |
| count++; |
| } |
| |
| int test_omp_sections_nowait() |
| { |
| release = 0; |
| count = 0; |
| |
| #pragma omp parallel num_threads(4) |
| { |
| int rank; |
| rank = omp_get_thread_num (); |
| #pragma omp sections nowait |
| { |
| #pragma omp section |
| { |
| wait_for_release_then_increment(rank); |
| } |
| #pragma omp section |
| { |
| wait_for_release_then_increment(rank); |
| } |
| #pragma omp section |
| { |
| wait_for_release_then_increment(rank); |
| } |
| #pragma omp section |
| { |
| fprintf(stderr, "Thread nr %d enters first sections and goes " |
| "immediately to next sections construct to release.\n", rank); |
| #pragma omp atomic |
| count++; |
| } |
| } |
| /* Begin of second sections environment */ |
| #pragma omp sections |
| { |
| #pragma omp section |
| { |
| release_and_increment(rank); |
| } |
| #pragma omp section |
| { |
| release_and_increment(rank); |
| } |
| #pragma omp section |
| { |
| release_and_increment(rank); |
| } |
| #pragma omp section |
| { |
| release_and_increment(rank); |
| } |
| } |
| } |
| // Check to make sure all eight sections were executed |
| return (count==8); |
| } |
| |
| int main() |
| { |
| int i; |
| int num_failed=0; |
| |
| for(i = 0; i < REPETITIONS; i++) { |
| if(!test_omp_sections_nowait()) { |
| num_failed++; |
| } |
| } |
| return num_failed; |
| } |