MUTEX$501595$ - перевод на голландский
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MUTEX$501595$ - перевод на голландский

PROPERTY OF CONCURRENCY CONTROL, WHICH IS INSTITUTED FOR THE PURPOSE OF PREVENTING RACE CONDITIONS
Mutex lock; Mutually-exclusive; Mutual exclusion rule; MutEx
  • ''i'' + 1}} not being removed.
  • the cycle of sections of a single process

MUTEX      
(computers) uitbreiding van word processor (tekstverwerker) die schrijven van muzikale tekst mogelijk maakt
Mutual Exclusion         
(in computerprogrammeringen) methode veel gezamenlijke synchrone toegang tot informatiebronnen (door mechanisme "lock-unlock")

Определение

mutual exclusion
<parallel, operating system> (Or "mutex", plural: "mutexes") A collection of techniques for sharing resources so that different uses do not conflict and cause unwanted interactions. One of the most commonly used techniques for mutual exclusion is the semaphore. (1995-04-08)

Википедия

Mutual exclusion

In computer science, mutual exclusion is a property of concurrency control, which is instituted for the purpose of preventing race conditions. It is the requirement that one thread of execution never enters a critical section while a concurrent thread of execution is already accessing said critical section, which refers to an interval of time during which a thread of execution accesses a shared resource or shared memory.

The shared resource is a data object, which two or more concurrent threads are trying to modify (where two concurrent read operations are permitted but, no two concurrent write operations or one read and one write are permitted, since it leads to data inconsistency). Mutual exclusion algorithms ensure that if a process is already performing write operation on a data object [critical section] no other process/thread is allowed to access/modify the same object until the first process has finished writing upon the data object [critical section] and released the object for other processes to read and write upon.

The requirement of mutual exclusion was first identified and solved by Edsger W. Dijkstra in his seminal 1965 paper "Solution of a problem in concurrent programming control", which is credited as the first topic in the study of concurrent algorithms.

A simple example of why mutual exclusion is important in practice can be visualized using a singly linked list of four items, where the second and third are to be removed. The removal of a node that sits between two other nodes is performed by changing the next pointer of the previous node to point to the next node (in other words, if node i is being removed, then the next pointer of node i – 1 is changed to point to node i + 1, thereby removing from the linked list any reference to node i). When such a linked list is being shared between multiple threads of execution, two threads of execution may attempt to remove two different nodes simultaneously, one thread of execution changing the next pointer of node i – 1 to point to node i + 1, while another thread of execution changes the next pointer of node i to point to node i + 2. Although both removal operations complete successfully, the desired state of the linked list is not achieved: node i + 1 remains in the list, because the next pointer of node i – 1 points to node i + 1.

This problem (called a race condition) can be avoided by using the requirement of mutual exclusion to ensure that simultaneous updates to the same part of the list cannot occur.

The term mutual exclusion is also used in reference to the simultaneous writing of a memory address by one thread while the aforementioned memory address is being manipulated or read by one or more other threads.