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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-04, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
** $Id$
\* */
package scala.concurrent;
class SyncChannel[a] {
private var data: a = _;
private var reading = false;
private var writing = false;
def await(cond: => Boolean) = while (!cond) { wait() }
def write(x: a) = synchronized {
await(!writing);
data = x;
writing = true;
if (reading) notifyAll();
else await(reading)
}
def read: a = synchronized {
await(!reading);
reading = true;
await(writing);
val x = data;
writing = false;
reading = false;
notifyAll();
x
}
}
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