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
foo(int n)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
main()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