问Groovy多线程意外停止

EN

    def pathFinder(){
        def permutation = []
        for (int i = 1; i <= noOfNodes; i++)
            permutation.push(i)

        while(true){
        if( mutex.tryAcquire(MAX_TIME,TimeUnit.MILLISECONDS) )
        { println "mutex acquired"
            if(finalFound){
                //check if another thread solved the problem
                mutex.release()
                println "mutex released - solution found"
                break
            }
            println "solution not found"
            //release the lock while checking the permutation
            mutex.release()
            println "mutex released for others to start looking"
            permutation = permutation.sort { new Random().nextInt() }
            println "permutation generated: "+permutation
            if(isPathHamiltonian(permutation)){
                if(mutex.tryAcquire(MAX_TIME,TimeUnit.MILLISECONDS))
                {
                println "mutex acquired for result"
                finalPermutation = permutation
                finalFound = true
                mutex.release()
                println "mutex for result released"
                break}
            }
        } 
        }
    }


    def threads = [] 

    noOfThreads.times(){
        def thread = Thread.start {
        pathFinder()  
        }
        threads << thread
    }
    println "I start waiting"
    threads*.join(MAX_TIME)
    println "I joined the finished"

    if(finalFound == true) println "Graph is proven to be hamiltonian : " + finalPermutation
    else println "Graph was not found hamiltonian"