Implementing check instructions in each thread within a redundant multithreading environments

An apparatus comprising:

• leading thread circuitry to execute a leading thread of instructions;
• trailing thread circuitry to execute a trailing thread of instructions;
• and
• a commit unit to commit corresponding checker instructions from the leading thread and the trailing thread, wherein the leading thread of instructions comprises checker instructions and selected instructions.

A system comprising:

• a first processor comprising:
• leading thread circuitry to execute a leading thread of checker instructions;
• trailing thread circuitry to execute a trailing thread of the checker instructions;
• and
• a retire unit to retire corresponding checker instructions from the leading thread and the trailing thread, wherein the leading thread of instructions comprises checker instructions and selected instructions
• a first interface to a second processor;
• a second interface to input/output devices;
• and
• an audio input-output device coupled to the second interface.