1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
// REQUIRES: ompx_taskgraph
// RUN: %libomp-cxx-compile-and-run
#include <iostream>
#include <cassert>
#define NT 100
#define MULTIPLIER 100
#define DECREMENT 5
int val;
// Compiler-generated code (emulation)
typedef struct ident {
void* dummy;
} ident_t;
#ifdef __cplusplus
extern "C" {
int __kmpc_global_thread_num(ident_t *);
int __kmpc_start_record_task(ident_t *, int, int, int);
void __kmpc_end_record_task(ident_t *, int, int, int);
}
#endif
void sub() {
#pragma omp atomic
val -= DECREMENT;
}
void add() {
#pragma omp atomic
val += DECREMENT;
}
void mult() {
// no atomicity needed, can only be executed by 1 thread
// and no concurrency with other tasks possible
val *= MULTIPLIER;
}
int main() {
val = 0;
int *x, *y;
#pragma omp parallel
#pragma omp single
for (int iter = 0; iter < NT; ++iter) {
int gtid = __kmpc_global_thread_num(nullptr);
int res = __kmpc_start_record_task(nullptr, gtid, /* kmp_tdg_flags */0, /* tdg_id */0);
if (res) {
#pragma omp task depend(out:y)
add();
#pragma omp task depend(out:x)
sub();
#pragma omp task depend(in:x,y)
mult();
}
__kmpc_end_record_task(nullptr, gtid, /* kmp_tdg_flags */0, /* tdg_id */0);
}
assert(val==0);
std::cout << "Passed" << std::endl;
return 0;
}
// CHECK: Passed
|
