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) A single process goes through.
(B) The later process has to wait.
(C) A deadlock occurs when the first process locks the first resource at the same time as the second process locks the second resource.
(D) The deadlock can be resolved by cancelling and restarting the first process.
NECESSARYCONDTIONS
A deadlock situation on a resource can arise if and only if all of the following conditions hold simultaneously in a system:[5]
Mutual exclusion: At least one resource must be held in a non-shareable mode. Otherwise, the processes would not be prevented from using the resource when necessary. Only one process can use the resource at any given instant of time.[6]
Hold and wait or resource holding: a process is currently holding at least one resource and requesting additional resources which are being held by other processes.
No preemption: a resource can be released only voluntarily by the process holding it.
Circular wait: each process must be waiting for a resource which is being held by another process, which in turn is waiting for the first process to release the resource. In general, there is a set of waiting processes, P = {P1, P2, …, PN}, such that P1 is waiting for a resource held by P2, P2 is waiting for a resource held by P3 and so on until PN is waiting for a resource held by P1.[3][7]These four conditions are known as the Coffman conditions from their first description in a 1971 article by Edward G. Coffman, Jr.[7]
DEADLOCK HANDLING
Most current operating systems cannot prevent deadlocks.[8] When a deadlock occurs, different operating systems respond to them in different non-standard manners. Most approaches work by preventing one of the four Coffman conditions from occurring, especially the fourth one.[9] Major approaches are as follows.
Ignoring deadlock Edit
In this approach, it is assumed that a deadlock will never occur. This is also an application of the Ostrich algorithm.[9][10] This approach was initially used by MINIX and UNIX.[7] This is used when the time intervals between occurrences of deadlocks are large and the data loss incurred each time is tolerable.
Detection Edit
Under the deadlock detection, deadlocks are allowed to occur. Then the state of the system is examined to detect that a deadlock has occurred and subsequently it is corrected. An algorithm is employed that tracks resource allocation and process states, it rolls back and restarts one or more of the processes in order to remove the detected deadlock. Detecting a deadlock that has already occurred is easily possible since the resources that each process has locked and/or currently requested are known to the resource scheduler of the operating system.[10]
After a deadlock is detected, it can be corrected by using one of the following methods:[citation needed]
Process termination: one or more processes involved in the deadlock may be aborted. One could choose to abort all competing processes involved in the deadlock. This ensures that deadlock is resolved with certainty and speed.[citation needed] But the expense is high as partial computations will be lost. Or, one could choose to abort one process at a time until the deadlock is resolved. This approach has high overhead because after each abort an algorithm must determine whether the system is still in deadlock.[citation needed] Several factors must be considered while choosing a candidate for termination, such as priority and age of the process.[citation needed]
Resource preemption: resources allocated to various processes may be successively preempted and allocated to other processes until the deadlock is broken.[11]
PREVENTION
DEAD LOCK PREVENTION ALGORITHMS
(A) Two processes competing for one resource, following a first-come, first-served policy. (B) Deadlock occurs when both processes lock the resource simultaneously. (C) The deadlock can be resolved by breaking the symmetry of the locks. (D) The deadlock can be prevented by breaking the symmetry of the locking mechanism.
Deadlock prevention works by preventing one of the four Coffman conditions from occurring.
Removing the mutual exclusion condition means that no process will have exclusive access to a resource. This proves impossible for resources that cannot be spooled. But even with spooled resources, deadlock could still occur. Algorithms that avoid mutual exclusion are called non-blocking synchronization algorithms.
The hold and wait or resource holding conditions may be removed by requiring processes to request all the resources they will need before starting up (or before embarking upon a particular set of operations). This advance knowledge is frequently difficult to satisfy and, in any case, is an inefficient use of resources. Another way is to require processes to request resources only when it has none. Thus, first they must release all their currently held resources before requesting all the resources they will need from scratch. This too is often impractical. It is so because resources may be allocated and remain unused for long periods. Also, a process requiring a popular resource may have to wait indefinitely, as such a resource may always be allocated to some process, resulting in resource starvation.[12] (These algorithms, such as serializing tokens, are known as the all-or-none algorithms.)
The no preemption condition may also be difficult or impossible to avoid as a process has to be able to have a resource for a certain amount of
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