Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/Barrier.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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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 } |