The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1999
Filed:
Nov. 27, 1996
Hitachi, Ltd., Tokyo, JP;
Abstract
To realize interprocessor data transfer with the data receive area not fixed in the real memory and with less overhead for synchronization, the send node sends to the destination node, data, a virtual address of a receive area, an address of a receive control flag, a comparison value, and a comparison method. Network adaptor in the destination node judges whether the transfer condition is fulfilled, based on the comparison value, the comparison method and the semaphore in the receive control flag designated by the receive control flag address. Network adaptor further detects whether the receive area of the virtual address is in the main storage, based on the virtual address and the address translation table. The send data is stored in the receive buffer provided in the area for OS, when the above-mentioned condition is not fulfilled or the receive area is not in the main storage. Either when the destination node program issues a specific system call or when the program issues a reading instruction to the data in the receive area and a page fault is generated, OS moves the send data from the receive buffer to the receive area.