import t
import stdio
import stdlib
import memhub
from g4node import G4Node, new_g4node


# ============================================================
# caller2: 另一个导入 G4Node 的模块
#
# 增加 G4Node 的跨模块引用次数，触发多模块竞争条件
# ============================================================


def caller2_reverse_chain(head: G4Node | t.CPtr) -> G4Node | t.CPtr:
    """反转链表，直接访问 Next 字段"""
    if head is None:
        return None
    prev: G4Node | t.CPtr = None
    cur: G4Node | t.CPtr = head
    while cur is not None:
        nxt: G4Node | t.CPtr = cur.Next
        cur.Next = prev
        prev = cur
        cur = nxt
    return prev


def caller2_count_nodes(head: G4Node | t.CPtr) -> t.CInt:
    """计算链表节点数"""
    count: t.CInt = 0
    cur: G4Node | t.CPtr = head
    while cur is not None:
        count = count + 1
        cur = cur.Next
    return count