Mercurial > hg > blitz_condensed
view src/EDU/oswego/cs/dl/util/concurrent/WaitableBoolean.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
children |
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/* File: WaitableBoolean.java Originally written by Doug Lea and released into the public domain. This may be used for any purposes whatsoever without acknowledgment. Thanks for the assistance and support of Sun Microsystems Labs, and everyone contributing, testing, and using this code. History: Date Who What 19Jun1998 dl Create public version */ package EDU.oswego.cs.dl.util.concurrent; /** * A class useful for offloading synch for boolean instance variables. * * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>] **/ public class WaitableBoolean extends SynchronizedBoolean { /** Make a new WaitableBoolean with the given initial value **/ public WaitableBoolean(boolean initialValue) { super(initialValue); } /** * Make a new WaitableBoolean with the given initial value, * and using the supplied lock. **/ public WaitableBoolean(boolean initialValue, Object lock) { super(initialValue, lock); } public boolean set(boolean newValue) { synchronized (lock_) { lock_.notifyAll(); return super.set(newValue); } } public boolean commit(boolean assumedValue, boolean newValue) { synchronized (lock_) { boolean success = super.commit(assumedValue, newValue); if (success) lock_.notifyAll(); return success; } } public boolean complement() { synchronized (lock_) { lock_.notifyAll(); return super.complement(); } } public boolean and(boolean b) { synchronized (lock_) { lock_.notifyAll(); return super.and(b); } } public boolean or(boolean b) { synchronized (lock_) { lock_.notifyAll(); return super.or(b); } } public boolean xor(boolean b) { synchronized (lock_) { lock_.notifyAll(); return super.xor(b); } } /** * Wait until value is false, then run action if nonnull. * The action is run with the synchronization lock held. **/ public void whenFalse(Runnable action) throws InterruptedException { synchronized (lock_) { while (value_) lock_.wait(); if (action != null) action.run(); } } /** * wait until value is true, then run action if nonnull. * The action is run with the synchronization lock held. **/ public void whenTrue(Runnable action) throws InterruptedException { synchronized (lock_) { while (!value_) lock_.wait(); if (action != null) action.run(); } } /** * Wait until value equals c, then run action if nonnull. * The action is run with the synchronization lock held. **/ public void whenEqual(boolean c, Runnable action) throws InterruptedException { synchronized (lock_) { while (!(value_ == c)) lock_.wait(); if (action != null) action.run(); } } /** * wait until value not equal to c, then run action if nonnull. * The action is run with the synchronization lock held. **/ public void whenNotEqual(boolean c, Runnable action) throws InterruptedException { synchronized (lock_) { while (!(value_ != c)) lock_.wait(); if (action != null) action.run(); } } }