WCT GetThreadWaitChain 总是调用 return false

Question

我正在尝试获取有关某个线程的 WCT 信息，但每次我调用 GetThreadWaitChain 函数时，我得到的响应都是 false，并且 ref 参数保持为零。

我做错了什么？

我在一个调用 WaitForMultipleObjects 的线程上调用这个函数，我确保这个线程在我调试时等待。

这是我的代码：

    internal void CollectWaitInformation(ClrThread thread)
    {
        var g_WctHandle = OpenThreadWaitChainSession(0, 0);

        uint threadID = thread.OSThreadId;

        WAITCHAIN_NODE_INFO[] NodeInfoArray = new WAITCHAIN_NODE_INFO[WCT_MAX_NODE_COUNT];


        int isCycle = 0;
        int count = 0;

        // Make a synchronous WCT call to retrieve the wait chain.
        bool result = GetThreadWaitChain(g_WctHandle,
                                IntPtr.Zero,
                                WCTP_GETINFO_ALL_FLAGS,
                                threadID, ref count, NodeInfoArray, out isCycle);

        if (!result)
        {
            //error
        }

        //Finaly ...
        CloseSession(g_WctHandle);
    }

    [DllImport("Advapi32.dll")]
    public static extern IntPtr OpenThreadWaitChainSession(OpenThreadChainFlags Flags, DWORD callback);

    [DllImport("Advapi32.dll")]
    public static extern bool GetThreadWaitChain(
        IntPtr WctHandle,
        IntPtr Context,
        UInt32 Flags,
        uint ThreadId,
        ref int NodeCount,
        [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 4)]
        [In, Out]
        WAITCHAIN_NODE_INFO[] NodeInfoArray,
        out int IsCycle
    );

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

        public struct LockObject
        {
            string ObjectName;
            LARGE_INTEGER Timeout;
            BOOL Alertable;
        }
        public struct ThreadObject
        {
            DWORD ProcessId;
            DWORD ThreadId;
            DWORD WaitTime;
            DWORD ContextSwitches;
        }
    }
}

}

在我之前的问题的帮助下：

Answer 1

来自文档：

NodeCount [in, out]

On input, a number from 1 to WCT_MAX_NODE_COUNT that specifies the number of nodes in the wait chain. On return, the number of nodes retrieved.

....

你不满足这个要求，因为你传入了0。

WCT GetThreadWaitChain 总是调用 return false

WCT GetThreadWaitChain call allways return false

c#

pinvoke

multithreading