37 lines
895 B
Scala
37 lines
895 B
Scala
package examples;
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object boundedbuffer {
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import concurrent.ops._;
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class BoundedBuffer[a](N: Int) {
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var in, out, n = 0;
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val elems = new Array[a](N);
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def await(cond: => Boolean) = while (!cond) { wait() }
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def put(x: a) = synchronized {
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await (n < N);
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elems(in) = x; in = (in + 1) % N; n = n + 1;
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if (n == 1) notifyAll();
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}
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def get: a = synchronized {
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await (n != 0);
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val x = elems(out); out = (out + 1) % N ; n = n - 1;
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if (n == N - 1) notifyAll();
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x
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}
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}
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def main(args: Array[String]) = {
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val buf = new BoundedBuffer[String](10);
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var cnt = 0;
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def produceString = { cnt = cnt + 1; cnt.toString() }
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def consumeString(ss: String) = System.out.println(ss);
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spawn { while (true) { val ssss = produceString; buf.put(ssss) } }
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spawn { while (true) { val s = buf.get; consumeString(s) } }
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}
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}
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