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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2007, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.concurrent
/** The class <code>SyncVar</code> ...
*
* @author Martin Odersky, Stepan Koltsov
* @version 1.0, 10/03/2003
*/
class SyncVar[A] {
private var isDefined: Boolean = false
private var value: A = _
private var exception: Option[Throwable] = None
def get = synchronized {
while (!isDefined) wait()
if (exception.isEmpty) value
else throw exception.get
}
def take() = synchronized {
try {
get
} finally {
unset()
}
}
def set(x: A) = synchronized {
value = x
isDefined = true
exception = None
notifyAll()
}
private def setException(e: Throwable) = synchronized {
exception = Some(e)
isDefined = true
notifyAll()
}
/**
* @deprecated Will be removed in 2.8. SyncVar should not allow exception by design.
*/
@deprecated def setWithCatch(x: => A) = synchronized {
try {
this set x
} catch {
case e =>
this setException e
throw e
}
}
def put(x: A) = synchronized {
while (isDefined) wait()
set(x)
}
def isSet: Boolean = synchronized {
isDefined
}
def unset(): Unit = synchronized {
isDefined = false
notifyAll()
}
}
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