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For unordered access as defined in the java.util.Map interface, the java.util.concurrent.ConcurrentHashMap implements java.util.concurrent.ConcurrentMap. [2] The mechanism is a hash access to a hash table with lists of entries, each entry holding a key, a value, the hash, and a next reference.
Figure 1: Three processes accessing a shared resource (critical section) simultaneously.. Thread synchronization is defined as a mechanism which ensures that two or more concurrent processes or threads do not simultaneously execute some particular program segment known as critical section.
A small phone book as a hash table. In computer science, a hash table is a data structure that implements an associative array, also called a dictionary or simply map; an associative array is an abstract data type that maps keys to values. [2]
File synchronization, such as syncing a hand-held MP3 player to a desktop computer; Cluster file systems, which are file systems that maintain data or indexes in a coherent fashion across a whole computing cluster; Cache coherency, maintaining multiple copies of data in sync across multiple caches;
The hash array mapped trie achieves almost hash table-like speed while using memory much more economically. Also, a hash table may have to be periodically resized, an expensive operation, whereas HAMTs grow dynamically.
In computer networks, a syncword, sync character, sync sequence or preamble is used to synchronize a data transmission by indicating the end of header information and the start of data. [ citation needed ] The syncword is a known sequence of data used to identify the start of a frame, and is also called reference signal or midamble in wireless ...
Memory-disk synchronisation is a process used in computers that immediately writes to disk any data queued for writing in volatile memory. Data is often held in this way for efficiency's sake, since writing to disk is a much slower process than writing to RAM.
File synchronization (or syncing) in computing is the process of ensuring that computer files in two or more locations are updated via certain rules. In one-way file synchronization , also called mirroring , updated files are copied from a source location to one or more target locations, but no files are copied back to the source location.