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===Coordinating access to shared resources===
The main challenge in designing concurrent programs is [[concurrency control]]: ensuring the correct sequencing of the interactions or communications between different computational executions, and coordinating access to resources that are shared among executions.<ref name=benari2006/> Potential problems include [[Race condition#Software|race conditions]], [[Deadlock (computer science)|deadlock]]s, and [[resource starvation]]. For example, consider the following algorithm to make withdrawals from a checking account represented by the shared resource <code>balance</code>:
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