Merge "Warn when ActivityManagerService.dumpStackTraces times out"

            ProcessCpuTracker processCpuTracker, SparseArray<Boolean> lastPids, String[] nativeProcs) {

        // Use a FileObserver to detect when traces finish writing.

        // The order of traces is considered important to maintain for legibility.

        final boolean[] closed = new boolean[1];

        FileObserver observer = new FileObserver(tracesPath, FileObserver.CLOSE_WRITE) {

            @Override

            public synchronized void onEvent(int event, String path) { notify(); }

            public synchronized void onEvent(int event, String path) { closed[0] = true; notify(); }

        };

        try {

                            final long sime = SystemClock.elapsedRealtime();

                            Process.sendSignal(firstPids.get(i), Process.SIGNAL_QUIT);

                            observer.wait(1000);  // Wait for write-close, give up after 1 sec

                            if (!closed[0]) Slog.w(TAG, "Didn't see close of " + tracesPath);

                            if (DEBUG_ANR) Slog.d(TAG, "Done with pid " + firstPids.get(i)

                                    + " in " + (SystemClock.elapsedRealtime()-sime) + "ms");

                        }