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#include <assert.h>
#include <stdlib.h>
#define LIST_LENGTH 10
struct node
{
struct node *next;
int val;
};
int
sum_nodes (struct node *head)
{
int i = 0, sum = 0;
#pragma acc parallel reduction(+:sum) present(head[:1])
{
for (; head != NULL; head = head->next)
sum += head->val;
}
return sum;
}
void
insert (struct node *head, int val)
{
struct node *n = (struct node *) malloc (sizeof (struct node));
if (head->next)
{
#pragma acc exit data detach(head->next)
}
n->val = val;
n->next = head->next;
head->next = n;
#pragma acc enter data copyin(n[:1])
#pragma acc enter data attach(head->next)
if (n->next)
{
#pragma acc enter data attach(n->next)
}
}
void
destroy (struct node *head)
{
while (head->next != NULL)
{
#pragma acc exit data detach(head->next)
struct node * n = head->next;
head->next = n->next;
if (n->next)
{
#pragma acc exit data detach(n->next)
}
#pragma acc exit data delete (n[:1])
if (head->next)
{
#pragma acc enter data attach(head->next)
}
free (n);
}
}
int
main ()
{
struct node list = { .next = NULL, .val = 0 };
int i;
#pragma acc enter data copyin(list)
for (i = 0; i < LIST_LENGTH; i++)
insert (&list, i + 1);
assert (sum_nodes (&list) == (LIST_LENGTH * LIST_LENGTH + LIST_LENGTH) / 2);
destroy (&list);
#pragma acc exit data delete(list)
return 0;
}
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