LLVM OpenMP 19.0.0git
detach_nested_task.c
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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
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 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
53int 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}
int * buf
int main()
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#define i
Definition: kmp_stub.cpp:87
static void my_sleep(double sleeptime)
Utility function to have a sleep function with better resolution and which only stops one thread.
Definition: omp_my_sleep.h:24
return ret
void foo()