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Techniques for permitting access across a context barrier on a small footprint device using run time environment privileges

  • US 6,922,835 B1
  • Filed: 01/22/1999
  • Issued: 07/26/2005
  • Est. Priority Date: 01/22/1999
  • Status: Expired due to Term
First Claim
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1. A small footprint device comprising:

  • at least one processing element configured to execute groups of one or more program modules in separate contexts, said one or more program modules comprising zero or more sets of executable instructions and zero or more sets of data definitions, said zero or more sets of executable instructions and said zero or more data definitions grouped as object definitions, each context comprising a protected object instance space such that at least one of said object definitions is instantiated in association with a particular context;

    a memory comprising instances of objects;

    a context barrier for separating and isolating said contexts, said context barrier configured for controlling execution of at least one instruction of one of said zero or more sets of instructions comprised by a program module based at least in part on whether said at least one instruction is executed for an object instance associated with a first one of said one or more separate contexts and whether said at least one instruction is requesting access to an instance of an object definition associated with a second one of said one or more separate contexts, said context barrier further configured to prevent said access if said access is unauthorized and enable said access if said access is authorized; and

    one context having access to all program modules without context barrier constraints.

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