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:
Oct. 03, 2000
Filed:
Feb. 26, 1998
Andrew Ward Beale, Aliso Viejo, CA (US);
Bong Jae Lee, Laguna Niguel, CA (US);
Dwayne Eugene Ebersole, Lancaster, PA (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A computer for executing I/O instructions, by emulation, in a foreign application program includes an emulator program which has a Send thread, a Get thread, and single Result thread. The Send thread calls into a native operating system for the computer to send data from the foreign application program to an I/O port. The Get thread calls into the native operating system to receive data from the I/O port for the foreign application program. The Result thread processes one result descriptor from the native operating system when data is sent for the Send thread, and processes another result descriptor from the native operating system when data is received for the Get thread, and is completely blocked from running on the computer between the processing of the result descriptors. These threads are cleared, asynchronously with respect to the transfer of any data, by sending a CLEAR command from the emulator to the native operating system which responds by unblocking the Result thread and sending it a dummy result descriptor.