![]() ![]() Once the execution is finished, the process releases the resource it was holding. What is Deadlock in OS?Īll the processes in a system require some resources such as central processing unit(CPU), file storage, input/output devices, etc to execute it. There are different ways to detect and recover a system from deadlock. We can prevent a deadlock by preventing any one of these conditions. The four necessary conditions for a deadlock situation to occur are mutual exclusion, hold and wait, no preemption and circular set. I am working on this article to add more deadlock interview questions.A deadlock in OS is a situation in which more than one process is blocked because it is holding a resource and also requires some resource that is acquired by some other process. ![]() We will discuss the necessary conditions to occur deadlock, how to prevent deadlock, Deadlock handling Strategies in detail in the upcoming articles. In this post, I have shared the basic concept of deadlock in the operating system. Read deadlock preventions vs avoidance in detail. This is very common and asked in many of the on-campus job interviews. What is the difference between Deadlock Prevention and Avoidance? There are four strategies to handle deadlock. On the other hand, if it occurs we have a recovery mechanism. But preventing the system not to occur deadlock is not easy as we require prior information about processes as well as resources. We can prevent the deadlock not to occur and it is the optimal solution. ![]() There are multiple deadlocks handling strategies to avoid deadlock. What are the different types of Deadlock Types and Handling Strategies? If you want not to occur deadlock, you should have to care not to satisfy any one of the conditions mentioned above. Even if one condition does not get satisfied, deadlock cannot occur. There are multiple necessary conditions to occur deadlock in the operating system. What are the Necessary Conditions to Occur Deadlock? Here, Client1 and Client2 are the two processes.ĭatabase table1 and table2 are the two resources.īoth clients cannot proceed further as both are waiting for the resources held by each other. Now consider the Deadlock in Operating System scenario… Client1 locks and holds the table1 from the database DB.Ĭlient1 wait for table2 from the same database to proceed.Ĭlient2 locks and holds the table2 from the database DB.Ĭlient2 wait for table1 from the same database to proceed. Interview Tip: Whenever an interviewer asked you deadlock interview questions, always try to explain them by taking an actual scenario. If the server allows multiple clients to modify data in the database table at the same time, data violations will occur. But the server can not give access to all the clients to modify data at the same time. Suppose there are multiple clients who want to access the database table at the server-side. But this does not get resolve every time and the system gets hanged. This deadlock problem should have to be resolved by the Operating System as all the resource management is carried out at the operating system level. If one process wants to access the resources which are acquired by other processes, the process needs to wait until the resource gets released by other processes. Here two processes wait for the resources acquired by each other.ĭeadlock mostly occurs in multitasking or client-server architecture where resource gets shared among multiple processes. What is Deadlock in the Operating System?ĭefinition: Deadlock is the condition that occurs when two processes wait for each other to complete and halt without proceeding further. What is the difference between Deadlock Prevention and Avoidance?.What are the different types of Deadlock Types and Handling Strategies?.What are the Necessary Conditions to Occur Deadlock?.What is Deadlock in the Operating System?. ![]()
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