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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.
Lamport's bakery algorithm uses a similar concept of a "ticket" or "counter" but does not make the use of atomic hardware operations. It was designed for fault tolerance rather than performance. Rather than all processors continuously examining the release counter, the bakery lock spins on examining the tickets of its peers. [3]
Dekker's algorithm; Peterson's algorithm; Lamport's bakery algorithm [7] Szymański's algorithm; Taubenfeld's black-white bakery algorithm [2] Maekawa's algorithm; These algorithms do not work if out-of-order execution is used on the platform that executes them. Programmers have to specify strict ordering on the memory operations within a thread.
the bakery algorithm for mutual exclusion of multiple threads in a computer system that require the same resources at the same time, the Chandy–Lamport algorithm for the determination of consistent global states (snapshot), and; the Lamport signature, one of the prototypes of the digital signature.
Peterson's algorithm (or Peterson's solution) is a concurrent programming algorithm for mutual exclusion that allows two or more processes to share a single-use resource without conflict, using only shared memory for communication.
A wait-for graph in computer science is a directed graph used for deadlock detection in operating systems and relational database systems.. In computer science, a system that allows concurrent operation of multiple processes and locking of resources and which does not provide mechanisms to avoid or prevent deadlock must support a mechanism to detect deadlocks and an algorithm for recovering ...
The implementation of critical sections vary among different operating systems. A critical section will usually terminate in finite time, [2] and a thread, task, or process must wait for a fixed time to enter it (bounded waiting). To ensure exclusive use of critical sections, some synchronization mechanism is required at the entry and exit of ...
The next morning, while Lamport was in the shower, he came up with the solution. When he arrived at Chandy's office, he was waiting for him with the same solution. They considered the algorithm to be the straightfoward application from the basic ideas of article 27, titled "Time, Clocks and the Ordering of Events in a Distributed System". [2]