SetProcessShutdownParameters

最新推荐文章于 2018-05-19 16:56:54 发布

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最新推荐文章于 2018-05-19 16:56:54 发布

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分类专栏： OS 文章标签： service notifications dependencies returning function parameters

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本文介绍如何使用SetProcessShutdownParameters函数来设置当前调用进程的关闭参数。该函数允许应用程序指定其相对于系统中其他进程的关闭优先级。文章还讨论了在服务关闭过程中考虑依赖关系的重要性。

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SetProcessShutdownParameters

The SetProcessShutdownParameters function sets shutdown parameters for the currently calling process. This function sets a shutdown order for a process relative to the other processes in the system.

BOOL SetProcessShutdownParameters(
  DWORD dwLevel,
  DWORD dwFlags
);

Parameters

dwLevel

[in] Shutdown priority for a process relative to other processes in the system. The system shuts down processes from high dwLevel values to low. The highest and lowest shutdown priorities are reserved for system components. This parameter must be in the following range of values.

Value	Meaning
000-0FF	System reserved last shutdown range.
100-1FF	Application reserved last shutdown range.
200-2FF	Application reserved "in between" shutdown range.
300-3FF	Application reserved first shutdown range.
400-4FF	System reserved first shutdown range.

All processes start at shutdown level 0x280.

During service shutdown, the SCM does not take dependencies into consideration. The SCM enumerates the list of running services and sends the SERVICE_CONTROL_SHUTDOWN command. Therefore, a service may fail because another service it depends on has already stopped. To set the shutdown order of dependent services, use the SetProcessShutdownParameters function. The SCM uses this function to give its handler 0x1E0 priority. The SCM sends SERVICE_CONTROL_SHUTDOWN notifications when its control handler is called and waits for the services to exit before returning from its control handler.