PONLINE_ROUTINE callback function (resapi.h)
Marks a resource as available for use. The PONLINE_ROUTINE type defines a pointer to this function.
Syntax
PONLINE_ROUTINE PonlineRoutine;
DWORD PonlineRoutine(
[in] RESID Resource,
[in, out] LPHANDLE EventHandle
)
{...}
Parameters
[in] Resource
Resource identifier for the resource to be made available.
[in, out] EventHandle
On input, EventHandle is NULL. On output, EventHandle contains a handle to a nonsignaled synchronization object. The resource DLL can signal this handle at any time to report a resource failure to the Resource Monitor. EventHandle can also be set to NULL on output, indicating that the resource does not support asynchronous event notification.
Return value
| Return code/value | Description |
|---|---|
|
The operation was successful, and the resource is now online. |
|
The resource was arbitrated with some other systems, and one of the other systems won the arbitration. Only quorum-capable resources return this value. |
|
The request is pending, and a thread has been activated to process the online request. |
If the operation was not successful for other reasons, Online should return one of the system error codes.
Remarks
If the Online entry-point function returns an error code other than ERROR_IO_PENDING, the Resource Monitor logs an event and calls Terminate.
Returning a valid EventHandle yields the following benefits:
- The Resource Monitor will not perform LooksAlive polling. Avoiding this overhead is often useful, particularly when your DLL supports multiple resource instances.
- You can report resource failure at any time by signaling the handle. The Resource Monitor will immediately call IsAlive to verify that the resource has failed.
Examples
Requirements
| Minimum supported client | None supported |
| Minimum supported server | Windows Server 2008 Enterprise, Windows Server 2008 Datacenter |
| Target Platform | Windows |
| Header | resapi.h |
See also
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