72 lines · c
1// RUN: %libomp-compile-and-run2 3// Parsing error until gcc8:4// UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-85 6// Parsing error until clang11:7// UNSUPPORTED: clang-10, clang-9, clang-8, clang-78 9// No icc compiler support yet10// XFAIL: icc11 12#include <stdio.h>13#include <omp.h>14 15int r;16 17int work(int k, int l)18{19 return k + l + 1;20}21void 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);27printf("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);32printf("executing task (%d, 1), th %d (gen by th %d)\n", i, omp_get_thread_num(), th_gen);33 }34 }35}36int foo() {37 int i;38 int th_gen = omp_get_thread_num();39 #pragma omp taskgroup task_reduction(+:r)40 {41 bar(0);42 }43printf("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);47printf("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) = 3054#define res 3055int main()56{57 r = 0;58 #pragma omp parallel num_threads(2)59 { // barrier ensures threads have started before tasks creation60 #pragma omp barrier61 // single ensures no race condition between taskgroup reductions62 #pragma omp single nowait63 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