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exclusive monitor

The hardware that remembers which address a load-exclusive marked and notices if anyone writes to it before the matching store.

The ARM exclusive monitor (RISC-V: reservation set) records the address range a load-exclusive covers, typically at cache-line granularity, and is cleared by another agent's write, a context switch or certain events; a store-exclusive succeeds only while it is still set.

See also

load-linked/store-conditional context switch spurious failure
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