CLREX Clear exclusive This instruction clears the local monitor of the executing PE. 1 1 0 1 0 1 0 1 0 0 0 0 0 0 1 1 0 0 1 1 0 1 0 1 1 1 1 1 CLREX {#<imm>} // CRm field is ignored <imm> Is an optional 4-bit unsigned immediate, in the range 0 to 15, defaulting to 15 and encoded in the "CRm" field. ClearExclusiveLocal(ProcessorID());