Patent ID: 7139832

Claim:
A data transfer method for processing system which allows both processes to be executed in a first data processor and in a second data processor to communicate with each other by direct data transfer between user spaces of the data processors, wherein communication via a first virtual interface connection between a first process in the first data processor and a second process in the second data processor is taken over by a second virtual interface connection between a third process in the first data processor and the second process in the second data processor, the method comprising the step of: setting a flag if the first process receives data which is transmitted via the first virtual interface connection; issuing, from the first process to the second process, a request for intermission of data transmission to the first process; intermitting, in the second process, data transmission to the first process and replying from the second process to the first process an acknowledge of the request for intermission of data transmission; after the acknowledge of the request is received in the first process, copying the data which is received in the first process to the third process; establishing the second virtual interface connection between the third process and the second process in response to a reconnection request issued from the first process; and taking over the communication from the first virtual interface connection to the second virtual interface connection to continue the communication.