1 // RUN: %libomp-compile-and-run
2 
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-10
5 // gcc 11 introduced detach clause, but gomp interface in libomp has no support
6 // XFAIL: gcc-11, gcc-12
7 // clang supports detach clause since version 11.
8 // UNSUPPORTED: clang-10, clang-9, clang-8, clang-7
9 // icc compiler does not support detach clause.
10 // UNSUPPORTED: icc
11 
12 // The outer detachable task creates multiple child tasks with dependencies
13 // when the last inner task incremented ret, the task calls omp_fulfill_event
14 // to release the outer task.
15 
16 #include <omp.h>
17 #include <stdio.h>
18 #include "omp_my_sleep.h"
19 
20 int *buf;
21 
22 int 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 atomic
35             ret++;
36 #if _OPENMP
37           if (j == n-1) {
38             //printf("Task %i, %i: omp_fulfill_event()\n", i, j);
39             omp_fulfill_event(event);
40           }
41 #endif
42         }
43       }
44     }
45   }
46   // the taskwait only guarantees the outer tasks to complete.
47   #pragma omp taskwait
48 
49   return ret;
50 }
51 
52 
53 int main()
54 {
55   int ret;
56 #pragma omp parallel num_threads(4)
57 #pragma omp master
58   {
59     ret = foo(8);
60   }
61   printf("%i\n", ret);
62   return !(ret == 64);
63 }
64