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On uni-processor systems, the simplest solution to achieve mutual exclusion is to disable interrupts during a process's critical section. This will prevent any interrupt service routines from running (effectively preventing a process from being preempted). Although this solution is effective, it leads to many problems.
A critical section is a piece of a program that requires mutual exclusion of access. Locks and critical sections in multiple threads As shown in the figure, [ 3 ] in the case of mutual exclusion ( mutex ), one thread blocks a critical section by using locking techniques when it needs to access the shared resource, and other threads must wait ...
In computer science, a lock or mutex (from mutual exclusion) is a synchronization primitive that prevents state from being modified or accessed by multiple threads of execution at once. Locks enforce mutual exclusion concurrency control policies, and with a variety of possible methods there exist multiple unique implementations for different ...
Maekawa's algorithm is an algorithm for mutual exclusion on a distributed system. The basis of this algorithm is a quorum -like approach where any one site needs only to seek permissions from a subset of other sites.
Dekker's algorithm is the first known correct solution to the mutual exclusion problem in concurrent programming where processes only communicate via shared memory. The solution is attributed to Dutch mathematician Th. J. Dekker by Edsger W. Dijkstra in an unpublished paper on sequential process descriptions [1] and his manuscript on cooperating sequential processes. [2]
Some processors have special instructions, like test-and-set or compare-and-swap, which, by locking the memory bus, can be used to provide mutual exclusion in SMP systems. Most modern CPUs reorder memory accesses to improve execution efficiency (see memory ordering for types of reordering allowed).
The Ricart–Agrawala algorithm is an algorithm for mutual exclusion on a distributed system. This algorithm is an extension and optimization of Lamport's Distributed Mutual Exclusion Algorithm, by removing the need for release messages. [1] It was developed by computer scientists Glenn Ricart and Ashok Agrawala.
Lamport's bakery algorithm is a computer algorithm devised by computer scientist Leslie Lamport, as part of his long study of the formal correctness of concurrent systems, which is intended to improve the safety in the usage of shared resources among multiple threads by means of mutual exclusion.