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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 ...
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.
One solution to the concurrent modification problem is using a particular wrapper class provided by a factory in java.util.Collections : public static <K,V> Map<K,V> synchronizedMap(Map<K,V> m) which wraps an existing non-thread-safe Map with methods that synchronize on an internal mutex. [4] There are also wrappers for the other kinds of ...
Reentrancy is neither necessary nor sufficient for thread-safety in multi-threaded environments. In other words, a reentrant subroutine can be thread-safe, [1] but is not guaranteed to be [citation needed]. Conversely, thread-safe code need not be reentrant (see below for examples). Other terms used for reentrant programs include "sharable code ...
While a thread is executing a method of a thread-safe object, it is said to occupy the object, by holding its mutex (lock). Thread-safe objects are implemented to enforce that at each point in time, at most one thread may occupy the object. The lock, which is initially unlocked, is locked at the start of each public method, and is unlocked at ...
At least for Oracle/OpenJDK, this does not use native thread-local storage in spite of OS threads being used for other aspects of Java threading. Instead, each Thread object stores a (non-thread-safe) map of ThreadLocal objects to their values (as opposed to each ThreadLocal having a map of Thread objects to values and incurring a performance ...
The following Java 5+ example [6] is a thread-safe implementation, ... Complete article "Java Singleton Pattern Explained" ... a non-profit organization.
The type of liveness requirements tend to define the data structure. The method calls can be blocking or non-blocking. Data structures are not restricted to one type or the other, and can allow combinations where some method calls are blocking and others are non-blocking (examples can be found in the Java concurrency software library).