Function ExecParallelHashPushTuple

src/backend/executor/nodeHash.c:3962–3975

* Insert a tuple at the front of a chain of tuples in DSA memory atomically. */

 * Insert a tuple at the front of a chain of tuples in DSA memory atomically.
 */
static inline void
ExecParallelHashPushTuple(dsa_pointer_atomic *head,
						  HashJoinTuple tuple,
						  dsa_pointer tuple_shared)
{
	for (;;)
	{
		tuple->next.shared = dsa_pointer_atomic_read(head);
		if (dsa_pointer_atomic_compare_exchange(head,
												&tuple->next.shared,
												tuple_shared))
			break;
	}
}

/*
 * Prepare to work on a given batch.