Dedlock

A deadlock state can occur when the following four circumstances hold simultaneously within a system:

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System Model

A system model or structure comprises a fixed number of resources that must be shared among different processes. These resources are divided into different types, each having a specific number of identical instances. Some examples of resource types are memory space, CPU cycles, directories and files, and I/O devices such as keyboards, printers, and CD/DVD drives. For instance, when a system has two CPUs, the resource type CPU has two instances.

Under the standard mode of operation, any process may use a resource in only the below-mentioned sequence:

1. Request: When the request can’t be approved immediately (where the case may be when another process is utilizing the resource), the requesting job must wait until it can obtain the resource.
2. Use: The process can run on the resource (like when the resource is a printer, its job/process is to print on the printer).
3. Release: The process releases the resource (like terminating or exiting any specific process).

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Источники:

https://www.javatpoint.com/os-deadlocks-introduction&rut=27152505f32d72c287e988f6f64ad6a8c5b7c79801c7382c67e0008aff80cc07
https://www.w3schools.in/operating-system/deadlocks&rut=bf5cbd0d963bf4ce38cb6025a94ced2badf2f5f9b6c071c2996cc198c7b681f9
https://technobyte.org/deadlocks-in-operating-systems/&rut=6b280aebf198152c1cbec1169e4e17bd7b74a2018437bff589a6ce9cd98e32e9