Data transfer and intermission between parent and child process
First Claim
1. 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, whereincommunication 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 dataprocessor 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.
1 Assignment
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Accused Products
Abstract
A data transfer method realizing a function similar to Unix'"'"'s FORK by the following operations: allowing a parent process on a server to issue a request for intermission of communication to a process on a client and allowing the process on the client to issue a report of completion of intermission; allowing the parent process to issue, to a child process created on the server and the process on the client, a request for establishment of a new communication line connection between them; and, if the parent process has received data from the process on the client before the establishment of the new connection, coping the data to the child process.
33 Citations
3 Claims
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1. 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. - View Dependent Claims (2, 3)
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Specification