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-rw-r--r--java/src/Condition.java124
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diff --git a/java/src/Condition.java b/java/src/Condition.java
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-/*************************************************
- *
- * = PACKAGE
- * JACE.Concurrency
- *
- * = FILENAME
- * Condition.java
- *
- *@author Irfan Pyarali
- *
- *************************************************/
-package JACE.Concurrency;
-
-import JACE.ASX.TimeoutException;
-import JACE.ASX.TimeValue;
-
-/**
- * <hr>
- * <h2>TITLE</h2>
- *<blockquote>
- * Abstraction for <em>traditional</em>
- * condition variable
- *</blockquote>
- *
- * <h2>DESCRIPTION</h2>
- *<blockquote>
- * This condition variable allows the use of one
- * mutex between multiple conditions.
- * This implementation is based on the C++ version of ACE.
- *</blockquote>
- */
-public class Condition
-{
- /**
- * Default constructor
- *@param Mutex for synchronization
- */
- public Condition (Mutex mutex)
- {
- mutex_ = mutex;
- }
-
- /**
- * Wait for condition to become signaled.
- *@exception InterruptedException exception during wait
- */
- public void Wait ()
- throws InterruptedException
- {
- waiters_++;
-
- try
- {
- mutex_.release();
- semaphore_.acquire ();
- mutex_.acquire ();
- }
- finally
- {
- waiters_--;
- }
- }
-
- /**
- * TimedWait for condition to become signaled.
- *@exception TimeoutException wait timed out exception
- *@exception InterruptedException exception during wait
- */
- public void Wait (TimeValue tv)
- throws TimeoutException, InterruptedException
- {
- waiters_++;
-
- try
- {
- mutex_.release();
-
- TimeValue start = TimeValue.getTimeOfDay ();
-
- semaphore_.acquire (tv);
-
- TimeValue now = TimeValue.getTimeOfDay ();
- tv.minusEquals (TimeValue.minus (now, start));
-
- mutex_.acquire (tv);
- }
- finally
- {
- waiters_--;
- }
- }
-
- /**
- * Signal condition. Wake one waiter (if any).
- */
- public void signal ()
- {
- if (waiters_ > 0)
- semaphore_.release ();
- }
-
- /**
- * Signal condition. Wake up all waiters (if any).
- */
- public void broadcast ()
- {
- for (int i = waiters_; i > 0; i--)
- semaphore_.release ();
- }
-
- /**
- * Accessor to lock
- *@return Mutex
- */
- public Mutex mutex ()
- {
- return mutex_;
- }
-
- private int waiters_;
- private Semaphore semaphore_ = new Semaphore (0);
- private Mutex mutex_;
-
-}