vault backup: 2025-03-10 08:59:43
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@ -110,4 +110,10 @@ unlock() :=
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### Safe registers
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Atomic R/W and specialized HW primitives provide some form of atomicity. But is it possible to enforce MUTEX without atomicity?
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A **MRMW Safe register** is a register that provides READ and
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A **MRSW Safe register** is a register that provides READ and WRITE such that:
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1. every READ that does not overlap with a WRITE returns the value stored in the register
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2. a READ that overlaps with a WRITE can return **any possible value** (of the register domain).
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A **MRMW Safe register** behaves like a MRSW safe register, when WRITE operations do not overlap. Otherwise, in case of overlapping WRITEs, the register can contain any value (of the register domain).
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This is the weakest type of register that is useful in concurrency.
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