/// <summary>
/// Gets WCT information using WCT api by the given threadId (OS threadId)
/// </summary>
/// <param name="threadId"> ThreadWCTInfo object</param>
/// <returns>Thread id of thread target</returns>
public ThreadWCTInfo GetBlockingObjects(uint threadId)
{
ThreadWCTInfo result = null;
var g_WctIntPtr = Functions.OpenThreadWaitChainSession((int)WCT_SESSION_OPEN_FLAGS.WCT_SYNC_OPEN_FLAG, 0);
WAITCHAIN_NODE_INFO[] NodeInfoArray = new WAITCHAIN_NODE_INFO[Const.WCT_MAX_NODE_COUNT];
int isCycle = 0;
int Count = Const.WCT_MAX_NODE_COUNT;
// Make a synchronous WCT call to retrieve the wait chain.
bool waitChainResult = Functions.GetThreadWaitChain(g_WctIntPtr,
IntPtr.Zero,
Const.WCTP_GETINFO_ALL_FLAGS,
threadId, ref Count, NodeInfoArray, out isCycle);
CheckCount(ref Count);
if (waitChainResult)
{
result = HandleGetThreadWaitChainRsult(threadId, Count, NodeInfoArray, isCycle);
}
else
{
HandleWctRequestError();
}
//Finaly ...
Functions.CloseThreadWaitChainSession(g_WctIntPtr);
return result;
}
public WaitChainInfoObject(WAITCHAIN_NODE_INFO item)
{
ObjectStatus = item.ObjectStatus;
ObjectType = item.ObjectType;
//LockObject stuct data
TimeOut = item.Union.LockObject.Timeout;
AlertTable = item.Union.LockObject.Alertable;
if (item.ObjectType == WCT_OBJECT_TYPE.WctThreadType)
{ //Use the ThreadObject part of the union
this.ThreadId = item.Union.ThreadObject.ThreadId;
this.ProcessId = item.Union.ThreadObject.ProcessId;
this.ContextSwitches = item.Union.ThreadObject.ContextSwitches;
this.WaitTime = item.Union.ThreadObject.WaitTime;
}
else
{//Use the LockObject part of the union
unsafe
{
ObjectName = Marshal.PtrToStringUni((IntPtr)item.Union.LockObject.ObjectName);
}
}
}
private ThreadWCTInfo HandleGetThreadWaitChainRsult(uint threadId, int Count, WAITCHAIN_NODE_INFO[] NodeInfoArray, int isCycle)
{
ThreadWCTInfo result = new ThreadWCTInfo(isCycle == 1, threadId);
WAITCHAIN_NODE_INFO[] info = new WAITCHAIN_NODE_INFO[Count];
Array.Copy(NodeInfoArray, info, Count);
result.SetInfo(info);
return result;
}
internal void SetInfo(WAITCHAIN_NODE_INFO[] info)
{
if (info != null)
{
foreach (var item in info)
{
var block = new WaitChainInfoObject(item);
WctBlockingObjects.Add(block);
}
}
}