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A thread can achieve mutual exclusion either by entering a synchronized block or method, which acquires an implicit lock, [14] [2] or by acquiring an explicit lock (such as the ReentrantLock from the java.util.concurrent.locks package [15]). Both approaches have the same implications for memory behavior.
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 ...
The event dispatching thread (EDT) is a background thread used in Java to process events from the Abstract Window Toolkit (AWT) graphical user interface event queue. It is an example of the generic concept of event-driven programming , that is popular in many other contexts than Java, for example, web browsers , or web servers .
A singleton implementation may use lazy initialization in which the instance is created when the static method is first invoked. In multithreaded programs, this can cause race conditions that result in the creation of multiple instances. The following Java 5+ example [6] is a thread-safe implementation, using lazy initialization with double ...
A process with two threads of execution, running on one processor Program vs. Process vs. Thread Scheduling, Preemption, Context Switching. In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system. [1]
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 ...
In Java, thread-local variables are implemented by the ThreadLocal class object. [15] ThreadLocal holds variable of type T, [15] which is accessible via get/set methods. For example, ThreadLocal variable holding Integer value looks like this:
The start() method executes the code added in the construct() method in a separate thread. To be alerted when the background thread finishes, one need only override the finished() method. The construct() method can return a result which can later be retrieved using SwingWorker's get() method.