Intel Corporation

Stephen H Dohrmann

Konrad K Lai

Ravi Rajwar

Mingqiu Sun

Carl M Ellison

Suresh Srinivas

Uma Srinivasan

Nikhil M Deshpande

Edward C Epp

Greg F Eastman

Ben H Lee, Iii

Example methods and apparatus to manage object locks are disclosed. A disclosed example method includes intercepting a processor request to apply the lock on the object, identifying a performance history of the object based on a number of instances of contention, reducing computing resources of the processor by, when the number of instances is below a threshold value, generating a lock bypass for the object to cause speculative execution of target code within the object, and preventing speculative execution by applying the lock on the object when the number of instances is above the threshold value.

Methods and apparatus to manage speculative execution of object locks by diverting the speculative execution of target code

Example methods and apparatus to manage object locks are disclosed. A disclosed example method includes receiving an object lock request from a processor, the lock request associated with object lock code to lock an object, and generating object lock-bypass code based on a type of the processor, the object lock-bypass code to execute in a managed runtime in response to receiving the object lock request. The example method also includes identifying a type of instruction set architecture (ISA) associated with the processor, invoking a checkpoint instruction for the processor based on the identified ISA, suspending the object lock code from executing and executing target code when the object is uncontended, and allowing the object lock code to execute when the object is contended.

Method and apparatus to bypass object lock by speculative execution of generated bypass code shell based on bypass failure threshold in managed runtime environment

A method for key verification through time varying item presentation based on a key hash result comprises generating a key hash result partially based on both a global identifier provided from a source and an estimated current time at that source. After generating the key hash result, a first time-varying item is produced using the key hash result as an index for a table lookup or generated based on Certain bit patterns forming the key hash result. Thereafter, the first time-varying item is presented for comparison with a second time-varying item being contemporaneously presented at the source. These computations are repeated, giving the impression of two views or instances of the same time-varying item. An attacker might be able to match one small portion of such a time sequence of presentations, by luck, but not any large portion of the sequence.

Time varying presentation of items based on a key hash

In one embodiment, a method for sensory verification comprises exchanging at least one data item with a computing unit and selecting a sequence number. Such selection may be accomplished by generation of the sequence number or manual entry by the user. Thereafter, a transformation is periodically performed on the data item, the sequence number and optionally a random value to produce a sequence of values, each value being used to produce a perceivable sensory element for comparison with another sensory element produced by another computing unit.

Sensory verification of shared data

A method and apparatus for synchronizing data on a network is disclosed. In one embodiment, the invention comprises a method including establishing a wireless communications channel between a first mobile computer device belonging to a workgroup and a second device and determining if the second device belongs to the workgroup of the first device. If the second device belongs to the workgroup of the first device, then the method further includes receiving data at the first device from the second device through the wireless communications channel and resolving conflicts between the received data and data of the first device.

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Hillsboro, OR, United States of America

Stephen H Dohrmann