contains status flags and the message itself. The state can be empty or ready, and communication occurs through a single cache line. Both the
contains status flags and the message itself. The state can be empty or ready, and communication occurs through a single cache line. Both the
Chapter11: Operating Systems
Section: Chapter Questions
Problem 2VE
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A message slot is a cache line that contains status flags and the message itself. The state can be empty or ready, and communication occurs through a single cache line.
Both the sender and the receiver write the message to the cache line. The receiver updates the state from empty to ready, then polls the cache line in a loop waiting for the sender to send a message. The sender waits in a tight loop until the receiver acknowledges the cache line, changes the state from ready to empty, and acknowledges receipt.
Explain that the system uses a snooping cache coherence protocol and describe the cache-coherence transaction taking place on the coherence bus when a message transfer occurs.
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