Created
April 16, 2012 02:53
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java lock and it's condition
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// Condition and ReentrantLock | |
class BoundedBuffer { | |
final Lock lock = new ReentrantLock(); | |
final Condition notFull = lock.newCondition(); | |
final Condition notEmpty = lock.newCondition(); | |
final Object[] items = new Object[100]; | |
int putptr, takeptr, count; | |
public void put(Object x) throws InterruptedException { | |
lock.lock(); | |
try { | |
while (count == items.length) | |
notFull.await(); | |
items[putptr] = x; | |
if (++putptr == items.length) putptr = 0; | |
++count; | |
notEmpty.signal(); | |
} finally { | |
lock.unlock(); | |
} | |
} | |
public Object take() throws InterruptedException { | |
lock.lock(); | |
try { | |
while (count == 0) | |
notEmpty.await(); | |
Object x = items[takeptr]; | |
if (++takeptr == items.length) takeptr = 0; | |
--count; | |
notFull.signal(); | |
return x; | |
} finally { | |
lock.unlock(); | |
} | |
} | |
} |
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from: condition : java doc