1 // RUN: %libomp-compile-and-run
2
3 // Parsing error until gcc8:
4 // UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8
5
6 // Parsing error until clang11:
7 // UNSUPPORTED: clang-10, clang-9, clang-8, clang-7
8
9 // No icc compiler support yet
10 // XFAIL: icc
11
12 #include <stdio.h>
13 #include <omp.h>
14
15 int r;
16
work(int k,int l)17 int work(int k, int l)
18 {
19 return k + l + 1;
20 }
bar(int i)21 void bar(int i) {
22 #pragma omp taskgroup task_reduction(+:r)
23 { int th_gen = omp_get_thread_num();
24 #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
25 {
26 r += work(i, 0);
27 printf("executing task (%d, 0), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen);
28 }
29 #pragma omp task in_reduction(+:r) firstprivate(i, th_gen)
30 {
31 r += work(i, 1);
32 printf("executing task (%d, 1), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen);
33 }
34 }
35 }
foo()36 int foo() {
37 int i;
38 int th_gen = omp_get_thread_num();
39 #pragma omp taskgroup task_reduction(+:r)
40 {
41 bar(0);
42 }
43 printf("th %d passed bar0\n", th_gen);
44 #pragma omp taskloop reduction(+:r) firstprivate(th_gen)
45 for (i = 1; i < 4; ++i) {
46 bar(i);
47 printf("th %d (gen by th %d) passed bar%d in taskloop\n", omp_get_thread_num(), th_gen, i);
48 #pragma omp task in_reduction(+:r)
49 r += i;
50 }
51 return 0;
52 }
53 // res = ((1+2)+(2+3)+(3+4)+(4+5)+1+2+3) = 30
54 #define res 30
main()55 int main()
56 {
57 r = 0;
58 #pragma omp parallel num_threads(2)
59 { // barrier ensures threads have started before tasks creation
60 #pragma omp barrier
61 // single ensures no race condition between taskgroup reductions
62 #pragma omp single nowait
63 foo();
64 }
65 if (r == res) {
66 return 0;
67 } else {
68 printf("error r = %d (!= %d)\n", r, res);
69 return 1;
70 }
71 }
72