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authorGilles Dubochet <gilles.dubochet@epfl.ch>2005-12-16 18:44:33 +0000
committerGilles Dubochet <gilles.dubochet@epfl.ch>2005-12-16 18:44:33 +0000
commit53a3cc7b17f4cf97075b7e71720777fd84109696 (patch)
tree0cc784e0b47ea49cc151a136d19f20bfa8ee2197 /docs/examples/boundedbuffer.scala
parentdf50e05006b43b007c2587549030d24b5c154398 (diff)
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Created proper 'docs' folder for new layout.
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-rw-r--r--docs/examples/boundedbuffer.scala36
1 files changed, 36 insertions, 0 deletions
diff --git a/docs/examples/boundedbuffer.scala b/docs/examples/boundedbuffer.scala
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+++ b/docs/examples/boundedbuffer.scala
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+package examples;
+
+object boundedbuffer {
+
+ import concurrent.ops._;
+
+ class BoundedBuffer[a](N: Int) {
+ var in, out, n = 0;
+ val elems = new Array[a](N);
+
+ def await(cond: => Boolean) = while (!cond) { wait() }
+
+ def put(x: a) = synchronized {
+ await (n < N);
+ elems(in) = x; in = (in + 1) % N; n = n + 1;
+ if (n == 1) notifyAll();
+ }
+
+ def get: a = synchronized {
+ await (n != 0);
+ val x = elems(out); out = (out + 1) % N ; n = n - 1;
+ if (n == N - 1) notifyAll();
+ x
+ }
+ }
+
+ def main(args: Array[String]) = {
+ val buf = new BoundedBuffer[String](10);
+ var cnt = 0;
+ def produceString = { cnt = cnt + 1; cnt.toString() }
+ def consumeString(ss: String) = System.out.println(ss);
+ spawn { while (true) { val ssss = produceString; buf.put(ssss) } }
+ spawn { while (true) { val s = buf.get; consumeString(s) } }
+ }
+
+}