| // RUN: %libomp-compile-and-run |
| |
| // Parsing error until gcc8: |
| // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8 |
| |
| // Parsing error until clang11: |
| // UNSUPPORTED: clang-10, clang-9, clang-8, clang-7 |
| |
| // No icc compiler support yet |
| // XFAIL: icc |
| |
| #include <stdio.h> |
| #include <omp.h> |
| |
| int r; |
| |
| int work(int k, int l) |
| { |
| return k + l + 1; |
| } |
| void bar(int i) { |
| #pragma omp taskgroup task_reduction(+:r) |
| { int th_gen = omp_get_thread_num(); |
| #pragma omp task in_reduction(+:r) firstprivate(i, th_gen) |
| { |
| r += work(i, 0); |
| printf("executing task (%d, 0), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen); |
| } |
| #pragma omp task in_reduction(+:r) firstprivate(i, th_gen) |
| { |
| r += work(i, 1); |
| printf("executing task (%d, 1), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen); |
| } |
| } |
| } |
| int foo() { |
| int i; |
| int th_gen = omp_get_thread_num(); |
| #pragma omp taskgroup task_reduction(+:r) |
| { |
| bar(0); |
| } |
| printf("th %d passed bar0\n", th_gen); |
| #pragma omp taskloop reduction(+:r) firstprivate(th_gen) |
| for (i = 1; i < 4; ++i) { |
| bar(i); |
| printf("th %d (gen by th %d) passed bar%d in taskloop\n", omp_get_thread_num(), th_gen, i); |
| #pragma omp task in_reduction(+:r) |
| r += i; |
| } |
| return 0; |
| } |
| // res = ((1+2)+(2+3)+(3+4)+(4+5)+1+2+3) = 30 |
| #define res 30 |
| int main() |
| { |
| r = 0; |
| #pragma omp parallel num_threads(2) |
| { // barrier ensures threads have started before tasks creation |
| #pragma omp barrier |
| // single ensures no race condition between taskgroup reductions |
| #pragma omp single nowait |
| foo(); |
| } |
| if (r == res) { |
| return 0; |
| } else { |
| printf("error r = %d (!= %d)\n", r, res); |
| return 1; |
| } |
| } |