An interactive concept flow for synchronization makes shared state predictable, from its assumptions through the main operation and boundary checks.
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readyConcurrency means operations overlap in time; it does not require multiple CPU cores. When concurrent operations access shared mutable state, their interleaving can violate assumptions such as “read, increment, write happens atomically.” Synchronization establishes which transitions are allowed and who can observe them.
Use the stages in order to explain synchronization makes shared state predictable. Each stage makes one assumption visible: what the operation promises, what representation it uses, how state changes, which boundary can invalidate a shortcut, and what evidence confirms the result.
For a worked explanation, continue to the topic article and execution trace.
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