Retrieves the name of the current Global Update Manager (GUM) lock owner for a cluster. Applications use this control code as a ClusterControl parameter.

  hCluster,                               // cluster handle
  hHostNode,                              // optional node handle
  CLUSCTL_CLUSTER_GET_GUM_LOCK_OWNER,     // this control code
  NULL,                                   // input buffer (not used)
  0,                                      // input buffer size (not used)
  lpOutBuffer,                            // output buffer: GUM ID and lock owner name
  cbOutBufferSize,                        // output buffer size (bytes)
  lpcbBytesReturned                       // resulting data size (bytes)


The following control code function parameter is specific to this control code. For complete parameter descriptions, see ClusterControl.


When this method returns, contains the current GUM identifier, followed by the current GUM lock owner name.


When this method returns, contains the combined size, in bytes, of a DWORD and the GUM lock owner name.

Return value

ClusterControl returns one of the following values.



The operation completed successfully. The lpcbBytesReturned parameter points to the actual size of the returned data.


234 (0xEA)

More data is available. The output buffer pointed to by lpOutBuffer was not large enough to hold the data resulting from the operation. The lpcbBytesReturned parameter points to the size required for the output buffer.

System error code

If any other value is returned, then the operation failed. The value of lpcbBytesReturned is unreliable.


When assessing a lock situation, make sure that the GUM identifier is for this control code is the same as the GUM identifier retrieved in the CLUSCTL_NODE_GET_STUCK_NODES control code. The GUM identifiers also need to be the same for a period before assuming that a lock has occurred.

The 32 bits of CLUSCTL_CLUSTER_GET_GUM_LOCK_OWNER are defined as follows (for more information, see Control Code Architecture).

ComponentBit locationValue
Object code24–31CLUS_OBJECT_CLUSTER (0x7)
Global bit23CLUS_NOT_GLOBAL (0x0)
Modify bit22CLUS_NO_MODIFY (0x0)
User bit21CLCTL_CLUSTER_BASE (0x0)
Type bit20External (0x0)
Operation code0–23CLCTL_GET_GUM_LOCK_OWNER (0x2b9)
Access code0–1CLUS_ACCESS_READ (0x1)



Minimum supported client

None supported

Minimum supported server

Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise

See also

Cluster Control Codes



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