Livelock – Concurrency: Part I

Livelock Two threads may result in a livelock, if the response by a thread to another thread’s action is always to undo or revert the consequences of the action. The threads are responding to each other, but are blocked in making any progress. The combined actions of the threads make it impossible for them to
Read more

Starvation – Concurrency: Part I

Starvation A thread can starve because it is unsuccessfully waiting for its turn to be able to proceed with its execution. In addition to deadlock and livelock that result in starvation, some other situations where starvation can occur are the following: Example 22.11 provides another example of starvation. The Hole class at (1) provides the
Read more

The Executor Framework – Concurrency: Part II

23.2 The Executor Framework Executors provide a high-level approach to launching tasks and managing threads. Tasks are executed asynchronously by threads in a multithreaded environment, where a task defines a unit of work—that is, a task is a set of instructions executed by a thread. Internally, an executor maintains a thread pool that utilizes a
Read more

The Executors Class – Concurrency: Part II

The Executors Class The java.util.concurrent.Executors class provides factory and utility methods for the interfaces defined in the java.util.concurrent package. In particular, it provides factory methods that return versatile implementations of the ExecutorService (p. 1427) and the ScheduledExecutorService (p. 1440) interfaces shown in Figure 23.1. The executor services created by the methods of the Executors class
Read more

The ExecutorService Interface – Concurrency: Part II

The ExecutorService Interface Table 23.2 lists the executor services provided by the factory methods of the Executors class. An executor service implements the ExecutorService interface that extends the Executor interface with methods that provide the following functionality: In addition to the execute() method, an executor service provides the overloaded methods submit(), invokeAll(), and invokeAny() for
Read more
Copyright All right reserved
BACK TO TOP