Patent ID: 11868258
Assignee: APPLE INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. The system as recited in claim 1 wherein:
a third agent circuit is configured to generate a conditional change to exclusive state request based on a store conditional instruction to a second cache block that is in a valid state at the third agent circuit, and
the coherency controller circuit is configured to determine if the third agent circuit retains a valid copy of the second cache block based on a second entry in the directory associated with the second cache block,
the coherency controller circuit is configured to transmit a completion indicating failure to the third agent circuit based on a determination that the third agent circuit no longer retains the valid copy of the second cache block, and
the coherency controller circuit is configured to terminate the conditional change to exclusive request based on the determination that the third agent circuit no longer retains the valid copy of the second cache block.