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copied!<p><code>Thread.isInterrupted()</code> is a very cheap function to call. There a few more indirections but all calls are quick enough. To summarize:</p> <blockquote> <p>It must be possible for Java to emulate <code>Thread.currentThread().isInterrupted()</code> by performing the double indirection <code>Thread::current()->_osthread->_interrupted</code>.</p> </blockquote> <p><a href="http://hg.openjdk.java.net/jdk8/jdk8/hotspot/file/tip/src/os/linux/vm/os_linux.cpp" rel="nofollow">Source</a>:</p> <pre><code>bool os::is_interrupted(Thread* thread, bool clear_interrupted) { assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); OSThread* osthread = thread->osthread(); bool interrupted = osthread->interrupted(); if (interrupted && clear_interrupted) { osthread->set_interrupted(false); // consider thread->_SleepEvent->reset() ... optional optimization } return interrupted; } </code></pre> <p><a href="http://hg.openjdk.java.net/jdk8/jdk8/hotspot/file/tip/src/share/vm/runtime/osThread.hpp" rel="nofollow"><code>OSThread</code></a> is implemented like this:</p> <pre><code>volatile jint _interrupted; // Thread.isInterrupted state // Note: _interrupted must be jint, so that Java intrinsics can access it. // The value stored there must be either 0 or 1. It must be possible // for Java to emulate Thread.currentThread().isInterrupted() by performing // the double indirection Thread::current()->_osthread->_interrupted. .... volatile bool interrupted() const { return _interrupted != 0; } </code></pre>

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