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annotate src/EDU/oswego/cs/dl/util/concurrent/Barrier.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1
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2 /*
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3 File: Barrier.java
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4
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5 Originally written by Doug Lea and released into the public domain.
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6 This may be used for any purposes whatsoever without acknowledgment.
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7 Thanks for the assistance and support of Sun Microsystems Labs,
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8 and everyone contributing, testing, and using this code.
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9
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10 History:
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11 Date Who What
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12 11Jun1998 dl Create public version
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13 */
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14
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15 package EDU.oswego.cs.dl.util.concurrent;
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16
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17 /**
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18 * Barriers serve
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19 * as synchronization points for groups of threads that
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20 * must occasionally wait for each other.
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21 * Barriers may support any of several methods that
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22 * accomplish this synchronization. This interface
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23 * merely expresses their minimal commonalities:
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24 * <ul>
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25 * <li> Every barrier is defined for a given number
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26 * of <code>parties</code> -- the number of threads
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27 * that must meet at the barrier point. (In all current
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28 * implementations, this
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29 * value is fixed upon construction of the Barrier.)
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30 * <li> A barrier can become <code>broken</code> if
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31 * one or more threads leave a barrier point prematurely,
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32 * generally due to interruption or timeout. Corresponding
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33 * synchronization methods in barriers fail, throwing
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34 * BrokenBarrierException for other threads
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35 * when barriers are in broken states.
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36 * </ul>
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37 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
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38
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39 **/
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40 public interface Barrier {
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41
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42
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43 /**
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44 * Return the number of parties that must meet per barrier
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45 * point. The number of parties is always at least 1.
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46 **/
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47
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48 public int parties();
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49
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50 /**
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51 * Returns true if the barrier has been compromised
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52 * by threads leaving the barrier before a synchronization
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53 * point (normally due to interruption or timeout).
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54 * Barrier methods in implementation classes throw
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55 * throw BrokenBarrierException upon detection of breakage.
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56 * Implementations may also support some means
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57 * to clear this status.
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58 **/
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59
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60 public boolean broken();
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61 }