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BOTH OR NOTHING!
DeadlockNot to be confused with Deathlok or Dreadlock.Four processes (blue lines) compete for one resource (grey circle), following a right-before-left policy. A deadlock occurs when all processes lock the resource simultaneously (black lines). The deadlock can be resolved by breaking the symmetry.In concurrent computing, a deadlock is a state in which each member of a group waits for another member, including itself, to take action, such as sending a message or more commonly releasing a lock.[1] Deadlocks are a common problem in multiprocessing systems, parallel computing, and distributed systems, where software and hardware locks are used to arbitrate shared resources and implement process synchronization.[2]In an operating system, a deadlock occurs when a process or thread enters a waiting state because a requested system resource is held by another waiting process, which in turn is waiting for another resource held by another waiting process. If a process is unable to change its state indefinitely because the resources requested by it are being used by another waiting process, then the system is said to be in a deadlock.[3]In a communications system, deadlocks occur mainly due to lost or corrupt signals rather than resource contention.[4]Two processes competing for two resources in opposite order.A single process goes through.The later process has to wait.A deadlock occurs when the first process locks the first resource at the same time as the second process locks the second resource.The deadlock can be resolved by cancelling and restarting the first process.
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