WCT WAITCHAIN_NODE_INFO联合验证

Question

我正在使用C#代码中的WCT (使用pinvoke)，我有以下问题：

当我调用GetThreadWaitChain时，我得到了WAITCHAIN_NODE_INFO数组的结果：

WAITCHAIN_NODE_INFO：https://msdn.microsoft.com/en-us/library/windows/desktop/ms681422(v=vs.85).aspx

WAITCHAIN_NODE_INFO包含两个结构的联合--这意味着只有一个值是有效的，我如何知道从WAITCHAIN_NODE_INFO结构中获取什么信息？

目前，我正在检查ProcessId和ThreadId是否为0，并由此假定另一个联合一半已初始化.

这是我的C# WAITCHAIN_NODE_INFO结构模型：

[StructLayout(LayoutKind.Sequential)]
public struct WAITCHAIN_NODE_INFO
{
    public WCT_OBJECT_TYPE ObjectType;
    public WCT_OBJECT_STATUS ObjectStatus;
    public _WAITCHAIN_NODE_INFO_UNION Union;
}


[StructLayout(LayoutKind.Explicit)]
public struct _WAITCHAIN_NODE_INFO_UNION
{
    [FieldOffset(0)]
    public _WAITCHAIN_NODE_INFO_LOCK_OBJECT LockObject;
    [FieldOffset(0)]
    public _WAITCHAIN_NODE_INFO_THREAD_OBJECT ThreadObject;
}

public unsafe struct _WAITCHAIN_NODE_INFO_LOCK_OBJECT
{
    /*The name of the object. Object names are only available for certain object, such as mutexes. If the object does not have a name, this member is an empty string.*/
    public fixed char ObjectName[WctApiConst.WCT_OBJNAME_LENGTH];
    /*This member is reserved for future use.*/
    public UInt64 Timeout;
    /*This member is reserved for future use.*/
    public UInt32 Alertable;
}

public struct _WAITCHAIN_NODE_INFO_THREAD_OBJECT
{
    /*The process identifier.*/
    public UInt32 ProcessId;
    /*The thread identifier. For COM and ALPC, this member can be 0.*/
    public UInt32 ThreadId;
    /*The wait time.*/
    public UInt32 WaitTime;
    /*The number of context switches.*/
    public UInt32 ContextSwitches;
}

有什么更好的方法来实现这一点吗？

提前感谢

Answer 1

逻辑是if ObjectType是WctThreadType，那么您应该读取联合的ThreadObject部分。否则，您将阅读工会的LockObject部分。

可以从MS提供的各种示例中收集到这种情况。例如：https://msdn.microsoft.com/en-us/library/windows/desktop/ms681418.aspx