64 lines · c
1// RUN: %libomp-compile-and-run2 3// Checked gcc 10.1 still does not support detach clause on task construct.4// UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8, gcc-9, gcc-105// gcc 11 introduced detach clause, but gomp interface in libomp has no support6// XFAIL: gcc-11, gcc-127// clang supports detach clause since version 11.8// UNSUPPORTED: clang-10, clang-9, clang-8, clang-79// icc compiler does not support detach clause.10// UNSUPPORTED: icc11 12// The outer detachable task creates multiple child tasks with dependencies13// when the last inner task incremented ret, the task calls omp_fulfill_event14// to release the outer task.15 16#include <omp.h>17#include <stdio.h>18#include "omp_my_sleep.h"19 20int *buf;21 22int foo(int n)23{24 int ret = 0;25 for (int i = 0; i < n; ++i) {26 omp_event_handle_t event;27 #pragma omp task detach(event) firstprivate(i,n) shared(ret)28 {29 for (int j = 0; j < n; ++j) {30 #pragma omp task firstprivate(event,i,j,n) shared(ret) default(none) depend(out:ret)31 {32 //printf("Task %i, %i: %i\n", i, j, omp_get_thread_num());33 my_sleep(.01);34 #pragma omp atomic35 ret++;36#if _OPENMP37 if (j == n-1) {38 //printf("Task %i, %i: omp_fulfill_event()\n", i, j);39 omp_fulfill_event(event);40 }41#endif42 }43 }44 }45 }46 // the taskwait only guarantees the outer tasks to complete.47 #pragma omp taskwait48 49 return ret;50}51 52 53int main()54{55 int ret;56#pragma omp parallel num_threads(4)57#pragma omp master58 {59 ret = foo(8);60 }61 printf("%i\n", ret);62 return !(ret == 64);63}64