In computer science, a deadlock is a state in which two or more competing actions are each waiting for the other to finish, and thus neither can ever proceed. Deadlock is a common problem in concurrent programming, and can be difficult to debug and diagnose.
There are four conditions that must be met for a deadlock to occur:
1. Mutual exclusion: Only one process can use a resource at a time.
2. Hold and wait: A process is holding a resource and waiting to acquire another resource that is being used by another process.
3. No preemption: A process cannot be forced to release a resource.
4. Circular wait: There is a cycle of processes, each holding a resource and waiting to acquire another resource.
If even one of these conditions is not met, then a deadlock cannot occur.
In addition to the four conditions, there are three general strategies for dealing with deadlocks: prevention, avoidance, and detection and recovery.
Prevention strategies ensure that at least one of the four conditions cannot occur. For example, if a process can request all the resources it needs before starting, then the hold and wait condition cannot occur.
Avoidance strategies try to ensure that resources are always available so that the hold and wait condition cannot occur. For example, if a process can request only the resources it needs and no more, then the no preemption condition cannot occur.
What is deadlock example?
A deadlock is a situation in which two or more processes are blocked forever, each waiting for one of the others to release a resource. Deadlocks can occur in a number of situations, such as when two processes have a lock on a shared resource and each process is waiting for the other to release the lock. Is the movie deadlock based on a true story? No, the movie Deadlock is not based on a true story. It is a fictional thriller that was released in 1991.
What is deadlock and how it occurs?
In computing, a deadlock is a state in which two or more processes are blocked, each waiting for the other to release a resource. The classic example of a deadlock is when two processes each have a lock on one resource, and each process is waiting for the other process to release its lock on the other resource. Deadlocks can occur in any system that allows multiple processes to acquire locks on resources.
Deadlocks can be avoided by careful design of the locking mechanism, or by using a lock-free or wait-free algorithm. What do you call a deadlock? A deadlock is a condition in which two or more processes are unable to continue because they are each waiting for the other to do something.
How does a deadlock work? A deadlock occurs when two or more processes are blocked indefinitely waiting for resources that will never be released by the other processes. The most common cause of deadlocks is when each process is holding a resource that the other process needs. For example, if Process A is holding a lock on Resource 1 and Process B is holding a lock on Resource 2, then both processes will be blocked waiting for the other process to release the lock.