Method Lock

src/include/spinlock.hpp:36–60

* @brief 获得锁 * @return Expected 成功返回空值，失败返回错误 */

   * @return Expected<void> 成功返回空值，失败返回错误
   */
  [[nodiscard]] __always_inline auto Lock() -> Expected<void> {
    auto intr_enable = cpu_io::GetInterruptStatus();
    cpu_io::DisableInterrupt();

    // 先尝试获取锁
    while (locked_.test_and_set(std::memory_order_acquire)) {
      // 在等待时检查是否是当前核心持有锁（递归锁检测）
      if (core_id_.load(std::memory_order_acquire) ==
          cpu_io::GetCurrentCoreId()) {
        // 递归锁定，恢复中断状态并返回失败
        if (intr_enable) {
          cpu_io::EnableInterrupt();
        }
        // klog::Err("spinlock {}: {} recursive lock detected.",
        //           cpu_io::GetCurrentCoreId(), name);
        return std::unexpected(Error{ErrorCode::kSpinLockRecursiveLock});
      }
      cpu_io::Pause();
    }

    // 获取锁成功后立即设置 core_id_
    core_id_.store(cpu_io::GetCurrentCoreId(), std::memory_order_release);
    saved_intr_enable_ = intr_enable;
    return {};
  }

  /**
   * @brief 释放锁