Channels ▼

JVM Languages

Multithreading, Java, & OSGi

Source Code Accompanies This Article. Download It Now.

Interrupt After Run

It is also possible for interrupt() to be called after run() has exited. ThreadManager.stopAll() could check to see if run() has exited before calling interrupt(), but by the time the call to interrupt() actually happens, run() may have exited. In practice, most interrupt() methods perform idempotent actions, such as closing streams. Usually, no special code is required to properly handle this case.

Interrupting the Right Thread

If your interrupt() method does use Thread.interrupt(), you'll need a handle on the thread running the run() method. This is another case where synchronization between run() and interrupt() is necessary—you can't interrupt a thread before it has been created. Here, however, ThreadManager really can help you out.

Interruptible defines a method called getRunThread() that returns the thread on which run() has been (or will be) invoked. This is why Interruptible is an abstract class, and not an interface.

The implementation depends on the private field runThread being assigned exactly once when the thread is created. Callers to getRunThread() block until the assignment occurs. ThreadManager arranges to perform this assignment but the field should not otherwise be visible, even to derived classes implementing Interruptible. This is why Interruptible is a nested class within ThreadManager.

To set the runThread field, ThreadManager leverages the nested ManagedRunnable class, mentioned earlier. ManagedRunnable has its own run() method that sets runThread and calls notifyAll() before invoking

Related Reading

More Insights

Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.