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package examples
import concurrent._, concurrent.ops._
class ComputeServer(n: Int) {
private trait Job {
type t
def task: t
def ret(x: t): Unit
}
private val openJobs = new Channel[Job]()
private def processor(i: Int): Unit = {
while (true) {
val job = openJobs.read
println("read a job")
job.ret(job.task)
}
}
def future[a](p: => a): () => a = {
val reply = new SyncVar[a]()
openJobs.write{
new Job {
type t = a
def task = p
def ret(x: a) = reply.set(x)
}
}
() => reply.get
}
spawn(replicate(0, n) { processor })
}
object computeserver extends Application {
def kill(delay: Int) = new java.util.Timer().schedule(
new java.util.TimerTask {
override def run() = {
println("[killed]")
System.exit(0)
}
},
delay) // in milliseconds
val server = new ComputeServer(1)
val f = server.future(42)
println(f())
kill(10000)
}
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