I've taken a look at VIX API 1.8.1 and also 1.10 beta.
I'm wondering, if it is possible to create a quiesced snapshot via VixVM_CreateSnapshot as the only predefined option seems to be VIX_SNAPSHOT_INCLUDE_MEMORY.
Via gSOAP the creation of a quiesced snapshot is no problem. But the huge difficulty there is the implementation of the WaitForUpdates loop...
The use of VixJob_Wait is much easier...