Concurrent communication with multiple applications on a smart card
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United States of America Patent
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-
Nov 30, 2004
Grant Date -
Jun 6, 2002
app pub date -
Dec 6, 2000
filing date -
Dec 6, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A smart card capable of having a plurality of applications has a memory that is logically partitioned into a plurality of memory blocks. A control program allocates one or more blocks to one of the applications, upon a declaration from the application of its memory needs, and schedules the applications for execution. Only those applications whose memory needs have been satisfied are scheduled. The control program receives a permission request packet from a host, addressed to an application, and passes the permission request packet to the application. When the control program receives a permission packet from the addressed application after the addressed application has had its declared memory needs satisfied, the control program sends the permission packet to the host. A virtual machine is used to execute one or more of the applications. The control program communicates with the virtual machine to control scheduling to predetermined time granularity. A swapper swaps data pages between the smart card's memory, i.e., primary storage, and secondary storage in a host.
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