Lamporttidsstämpeln

Lamporttidsstämpeln, or Lamport timestamp, is a concept in distributed systems that provides a way to order events. It is a logical clock system developed by Leslie Lamport that ensures causality is maintained. A Lamport timestamp assigns a number to each event in a distributed system. When an event occurs, its timestamp is incremented. If a process sends a message, it includes its current Lamport timestamp with the message. When a process receives a message, it updates its own timestamp to be the maximum of its current timestamp and the received timestamp, and then increments its timestamp. This ensures that if event A causally precedes event B, then the Lamport timestamp of A will be less than the Lamport timestamp of B. However, the converse is not always true; two events with the same or ordered timestamps may not have a causal relationship. Lamport timestamps are crucial for implementing distributed mutual exclusion, deadlock detection, and other distributed algorithms where a consistent ordering of events is necessary. They differ from physical clocks as they do not rely on synchronized real-time clocks across all nodes in the system. Instead, they rely on the communication between processes to establish a logical ordering.