pvaClientProcess is a synchronous wrapper for the pvAccess::ChannelProcess API, which is a callback based API. Thus it is easier to use than pvAccess::ChannelProcess itself.
An instance of PvaClientProcess is created via a call to one of the followimg:
class PvaClientChannel ... { ... PvaClientProcessPtr createProcess(std::string const & request = ""); PvaClientProcessPtr createProcess(epics::pvData::PVStructurePtr const & pvRequest); ... };An instance of PvaClientProcess connects to a single channel. PvaClientProcess has both synchronous methods, which block, and non blocking methods.
PvaClientChannel has methods:
connect Calls issueConnect and then waitConnect. issueConnect issues a request to the server to create the server side of ChannelPut. waitConnect blocks until server responds that it has created the ChannelPut. process Calls issueProcess and then waitProcess. issueProcess issues a process request to the server. waitProcess waits until the server send a message that the process is complete.issueConnect and issueProcess do not block. All other methods can block.