private Thread getStuckThread()

in src/main/java/org/junit/internal/runners/statements/FailOnTimeout.java [214:237]

• 18 lines of code
• 7 McCabe index (conditional complexity)

    private Thread getStuckThread(Thread mainThread) {
        List<Thread> threadsInGroup = getThreadsInGroup(mainThread.getThreadGroup());
        if (threadsInGroup.isEmpty()) {
            return null;
        }

        // Now that we have all the threads in the test's thread group: Assume that
        // any thread we're "stuck" in is RUNNABLE.  Look for all RUNNABLE threads. 
        // If just one, we return that (unless it equals threadMain).  If there's more
        // than one, pick the one that's using the most CPU time, if this feature is
        // supported.
        Thread stuckThread = null;
        long maxCpuTime = 0;
        for (Thread thread : threadsInGroup) {
            if (thread.getState() == Thread.State.RUNNABLE) {
                long threadCpuTime = cpuTime(thread);
                if (stuckThread == null || threadCpuTime > maxCpuTime) {
                    stuckThread = thread;
                    maxCpuTime = threadCpuTime;
                }
            }               
        }
        return (stuckThread == mainThread) ? null : stuckThread;
    }