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// RUN: %libomp-compile-and-run
// Checked gcc 10.1 still does not support detach clause on task construct.
// UNSUPPORTED: gcc-4, gcc-5, gcc-6, gcc-7, gcc-8, gcc-9, gcc-10
// gcc 11 introduced detach clause, but gomp interface in libomp has no support
// XFAIL: gcc-11, gcc-12
// clang supports detach clause since version 11.
// UNSUPPORTED: clang-10, clang-9, clang-8, clang-7
// icc compiler does not support detach clause.
// UNSUPPORTED: icc
// The outer detachable task creates multiple child tasks with dependencies
// when the last inner task incremented ret, the task calls omp_fulfill_event
// to release the outer task.
#include <omp.h>
#include <stdio.h>
int *buf;
int foo(int n)
{
int ret = 0;
for (int i = 0; i < n; ++i) {
omp_event_handle_t event;
#pragma omp task detach(event) firstprivate(i,n) shared(ret)
{
for (int j = 0; j < n; ++j) {
#pragma omp task firstprivate(event,i,j,n) shared(ret) default(none) depend(out:ret)
{
//printf("Task %i, %i: %i\n", i, j, omp_get_thread_num());
#pragma omp atomic
ret++;
#if _OPENMP
if (j == n-1) {
//printf("Task %i, %i: omp_fulfill_event()\n", i, j);
omp_fulfill_event(event);
}
#endif
}
}
}
}
// the taskwait only guarantees the outer tasks to complete.
#pragma omp taskwait
return ret;
}
int main()
{
int ret;
#pragma omp parallel
#pragma omp master
{
ret = foo(8);
}
printf("%i\n", ret);
//CHECK: 64
return 0;
}
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