System having device driver operates in first mode for allowing concurrent access to adapter by applications and second mode for limiting access to one application
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United States of America Patent
Stats
-
Sep 23, 1997
Grant Date -
N/A
app pub date -
May 11, 1995
filing date -
Feb 12, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A data processing system gives an application running on the operating system exclusive ownership of a hardware device. The system is operable in two modes. In the first mode the application interacts with the hardware device by making use of the processing system. In this mode many layers of the processing system are involved and the interaction time with the hardware is slow and inconsistent. In the second mode, exclusive ownership of the hardware device is granted to the application by the driver. In this mode the application has direct access to the hardware device thus avoiding the involvement of the processing system layers. The application accesses and uses the driver through a low latency processor interface linked into the application program itself.
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