Under the deadlock detection, deadlocks are allowed to occur. Ignoring deadlocks can be safely done if deadlocks are formally proven to never occur. This is used when the time intervals between occurrences of deadlocks are large and the data loss incurred each time is tolerable. This approach was initially used by MINIX and UNIX. This is also an application of the Ostrich algorithm. In this approach, it is assumed that a deadlock will never occur. Most approaches work by preventing one of the four Common conditions from occurring, especially the fourth one. When a deadlock occurs, different operating systems respond to them in different non-standard manners. Most current operating systems cannot prevent deadlocks. While these conditions are sufficient to produce a deadlock on single-instance resource systems, they only indicate the possibility of deadlock on systems having multiple instances of resources. These four conditions are known as the Coffman conditions from their first description in a 1971 article by Edward G. In general, there is a set of waiting processes, P =, such that P 1 is waiting for a resource held by P 2, P 2 is waiting for a resource held by P 3 and so on until P N is waiting for a resource held by P 1.
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