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PWAITCHAINCALLBACK callback function (wct.h)

  • Article

An application-defined callback function that receives a wait chain. Specify this address when calling the OpenThreadWaitChainSession function.

The PWAITCHAINCALLBACK type defines a pointer to this callback function. WaitChainCallback is a placeholder for the application-defined function name.

Syntax

PWAITCHAINCALLBACK Pwaitchaincallback;

void Pwaitchaincallback(
  HWCT WctHandle,
  DWORD_PTR Context,
  DWORD CallbackStatus,
  LPDWORD NodeCount,
  PWAITCHAIN_NODE_INFO NodeInfoArray,
  LPBOOL IsCycle
)
{...}

Parameters

WctHandle

A handle to the WCT session created by the OpenThreadWaitChainSession function.

Context

A optional pointer to an application-defined context structure specified by the GetThreadWaitChain function.

CallbackStatus

The callback status. This parameter can be one of the following values, or one of the other system error codes.

Value Meaning
ERROR_ACCESS_DENIED
 The caller did not have sufficient privilege to open a target thread.
ERROR_CANCELLED
 The asynchronous session was canceled by a call to the CloseThreadWaitChainSession function.
ERROR_MORE_DATA
 The NodeInfoArray buffer is not large enough to contain all the nodes in the wait chain. The NodeCount parameter contains the number of nodes in the chain. The wait chain returned is still valid.
ERROR_OBJECT_NOT_FOUND
 The specified thread could not be located.
ERROR_SUCCESS
 The operation completed successfully.
ERROR_TOO_MANY_THREADS
 The number of nodes exceeds WCT_MAX_NODE_COUNT. The wait chain returned is still valid.

NodeCount

The number of nodes retrieved, up to WCT_MAX_NODE_COUNT. If the array cannot contain all the nodes of the wait chain, the function fails, CallbackStatus is ERROR_MORE_DATA, and this parameter receives the number of array elements required to contain all the nodes.

NodeInfoArray

An array of WAITCHAIN_NODE_INFO structures that receives the wait chain.

IsCycle

If the function detects a deadlock, this variable is set to TRUE; otherwise, it is set to FALSE.

Return value

None

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header wct.h

See also

GetThreadWaitChain

OpenThreadWaitChainSession

WAITCHAIN_NODE_INFO