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ThreadSafe detects Java concurrency defects: [2] [3] [4] Race conditions – which lead to incorrect or unpredictable behaviour that is difficult to reproduce in a debugger. Deadlocks [7] – caused by circular waits between threads waiting for shared resources.
Thread safe, MT-safe: Use a mutex for every single resource to guarantee the thread to be free of race conditions when those resources are accessed by multiple threads simultaneously. Thread safety guarantees usually also include design steps to prevent or limit the risk of different forms of deadlocks , as well as optimizations to maximize ...
Collection implementations in pre-JDK 1.2 versions of the Java platform included few data structure classes, but did not contain a collections framework. [4] The standard methods for grouping Java objects were via the array, the Vector, and the Hashtable classes, which unfortunately were not easy to extend, and did not implement a standard member interface.
In computer programming, thread-local storage (TLS) is a memory management method that uses static or global memory local to a thread. The concept allows storage of data that appears to be global in a system with separate threads. Many systems impose restrictions on the size of the thread-local memory block, in fact often rather tight limits.
A concurrent hash-trie or Ctrie [1] [2] is a concurrent thread-safe lock-free implementation of a hash array mapped trie. It is used to implement the concurrent map abstraction. It has particularly scalable concurrent insert and remove operations and is memory-efficient. [3]
The following Java 5+ example [6] is a thread-safe implementation, using lazy initialization with double-checked locking. public class Singleton ...
In software engineering, double-checked locking (also known as "double-checked locking optimization" [1]) is a software design pattern used to reduce the overhead of acquiring a lock by testing the locking criterion (the "lock hint") before acquiring the lock.
Since Java 1.5, concurrent hash maps are provided based upon concurrent map interface. [ 10 ] libcuckoo provides concurrent hash tables for C / C++ allowing concurrent reads and writes.