VOID WINAPI * PFN_HSE_IO_COMPLETION( EXTENSION_CONTROL_BLOCK * pECB, PVOID pContext, DWORD cbIO, DWORD dwError );
This is the callback function for handling completions of asynchronous I/O operations. This function performs necessary clean up and resubmits additional I/O, if required. If there is no more work to be done for the current request, this function cleans up the state and notifies IIS that the request is ending by sending a ServerSupportFunction with the HSE_REQ_DONE_WITH_SESSION value.