2236008 Ontario Limited

Blackberry Corporation

Christopher William Lewis Hobbs

Christopher Lyle Bender

Geordon Thomas Ferguson

Oliver Whitehouse

Alberto Daniel Zubiri

Kenneth Cyril Schneider

Kerry Wayne Johnson

Patrick Christopher Lee

Peter Shook

A method to detect hardware and software errors in an embedded system is disclosed. The method includes: detecting or measuring, by a plurality of sensors, an operating state of the embedded system; operating a plurality of replicated computation engines in group synchrony, wherein the plurality of replicated computation engines are replicated instances of a single computation engine and wherein the plurality of replicated computation engines are grouped into one or more groups such that, for each group, each member of the group starts in a same processing logic state and processes same events in the same order; intercepting output of the plurality of sensors and transmitting the output to each replicated computation engine of a group in a defined order; and actuating selected computation engines of the plurality of replicated computation engines and arbitrating between outputs of the selected computation engines.

Software handling of errors

In some implementations, a method of managing access to resources in a single device including receiving, from a first resource assigned to a first perimeter, a request to access a second resource assigned to a second perimeter different from the first perimeter. The single device includes the first perimeter and the second perimeter. Whether access to the second resource is prohibited is determined based on a management policy for the first perimeter. The management policy defining one or more rules for accessing resources assigned to the second perimeter including the second resource.

Managing access to resources

A method automatically verifies information to ensure it is rendered correctly on a display screen. The method generates an electronic configuration file that controls the interactions between a graphics monitoring unit and a system application stored in an electronic memory. The method retrieves data stored in a portion of a display's memory that holds the content of a screen image to be rendered on the display screen and compares the data stored in a portion of a display's memory with second data provided by the system application to verify that the screen image is displayed on the display screen correctly. The method transmits the results of the comparison to the system application.

Symbology monitoring system

A system and method enables loosely-coupled lock-step computing including sensors that detect or measure a physical property and server groups. Each server group is serially linked to another server group and includes server instances operating in virtual synchrony. Virtual synchrony middleware receives outputs from multiple server instances and renders a single reply based on the outputs from the multiple server instances. The virtual synchrony middleware replicates and orders incoming requests to the server groups to ensure each of the server instances of that server group receives the same incoming requests in the same order.

Loosely-coupled lock-step chaining

A system and method that detects hardware and software errors in an embedded system that includes detecting or measuring an operating state; causing one or more computation engines to operates in group synchrony; causing one or more active monitors that monitor the computation engines to an automotive integrity level to operate in group synchrony; synchronizing the communication between and from the plurality of computation engines and the plurality of active monitors, respectively; and arbitrating the output generated by the computation engines and the active monitors.

Software handling of hardware errors

In some implementations, a method for managing data in a user device includes pushing first metadata for a first resource in a first perimeter to a service external to the first perimeter. The first perimeter is configured to prevent external resources from accessing resources in the first perimeter. Second metadata for a second resource in a second perimeter is pushed to the external service. The external service is external to the second perimeter, the second perimeter being configured to prevent external resources from accessing resources in the second perimeter. Information is presented to the user based on a combination of the first metadata and the second metadata.

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Ottawa, Canada

Christopher William Lewis Hobbs