Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral adapting
Patent
1998-02-26
2000-10-03
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral adapting
709230, 709249, 709304, 710 63, 710 11, G06F 1310
Patent
active
061286796
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.
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Selective Start and Stop of 3270 Sessions, IBM TDB n11 04-09 p. 150, Apr., 1993.
Beale Andrew Ward
Ebersole Dwayne Eugene
Lee Bong Jae
Fassbender Charles J.
Lee Thomas C.
Peyton Tammara
Samuels Steven B.
Starr Mark T.
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