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Concurrent Systems/notes/7- MUTEX-free concurrency.md

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+Critical sections (locks) have drawbacks:
+- if not put at the right level of granularity, they unnecessarily reduce concurrency
+- delays of one process may affect the whole system
+
+**MUTEX-freedom:** the only atomicity is the one provided by the primitives themselves (no wrapping of code into CSs)
+	the liveness properties used so far cannot be used anymore, since they rely on CSs.
+(example: if we have only atomic R/W registers, these are the only atomic things that we have. But we may also have atomic primitives like *test&set*, *compare&swap* ecc.).
+
+1. **Obstruction freedom:**
+