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Bookmark or Share- multithreading - What is a deadlock? - Stack OverflowA deadlock is a state of a system in which no single process/thread is capable of executing an action. As mentioned by others, a deadlock is typically the result of a situation where each process/thread wishes to acquire a lock to a resource that is already locked by another (or even the same) process/thread.
- Deadlocks in Oracle - Stack OverflowOracle detects a deadlock automatically, throws ORA-00060: deadlock detected while waiting for resource, and rolls back one of the transactions involved in the deadlock which Oracle decided as the victim. The previous successful transactions are not rolled back.
- Avoiding deadlock by using NOLOCK hint - Stack OverflowTransaction (Process ID 86) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction Someone told me that if I use NOLOCK hint in my stored procedures, it will ensure it will never be deadlocked.
- An async/await example that causes a deadlock - Stack OverflowDeadlock. The top-level method is blocking the context thread, waiting for GetJsonAsync to complete, and GetJsonAsync is waiting for the context to be free so it can complete. For the UI example, the "context" is the UI context; for the ASP.NET example, the "context" is the ASP.NET request context.
- Difference between racearound condition and deadlockA deadlock is when two (or more) threads are blocking each other. Usually this has something to do with threads trying to acquire shared resources. For example if threads T1 and T2 need to acquire both resources A and B in order to do their work.
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