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=== Concurrency ===
* [[Deadlock (computer science)|Deadlock]] {{endash}} a task cannot continue until a second finishes, but at the same time, the second cannot continue until the first finishes.
* [[Race condition]] {{endash}} multiple simultaneous tasks compete for resources.
* Errors in [[critical section]]s, [[mutual exclusion]]s and other features of [[Concurrent programming#Coordinating access to resources|concurrent processing]]. [[Time-of-check-to-time-of-use]] (TOCTOU) is a form of unprotected critical section.
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