Java concurrency package

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The Java concurrency package is a library supporting threading and parallel programming in the Java programming language.

Synchronizers

Mutilthread Synchronization before Java 5

Before Java 5, multithreads are supported using the lock mechanism for synchronization. Locks are implemented in Synchronized method. This mechanism “ensures that only one Java thread can execute an object's synchronized methods at a time” and “also allows threads to wait for resources to become available, and allows the thread that makes resources available to notify other threads that are waiting for the resources”." . When the synchronized keyword is used, the thread which invokes the synchronized method must obtain a lock for the object which makes this thread the lock holder. The rule of thumb of synchronized method is that only one thread can hold this lock at a time.

Links

Java Concurrency in Practice

Lesson: Concurrency

Java Technology