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import java.util.Map;
public class Main {
static public void main(String[] args) throws Exception {
checkManager();
for (int i = 1; i <= 2; i++) {
System.out.println("\nspawning child #" + i);
child();
Thread.sleep(2000);
checkManager();
}
System.out.println("\ndone!");
}
static private void child() throws Exception {
System.out.println("spawning child");
ProcessBuilder pb = new ProcessBuilder("/system/bin/sleep", "5");
Process proc = pb.start();
Thread.sleep(1000);
checkManager();
proc.waitFor();
System.out.println("child died");
}
static private void checkManager() {
Map<Thread, StackTraceElement[]> traces = Thread.getAllStackTraces();
boolean found = false;
for (Map.Entry<Thread, StackTraceElement[]> entry :
traces.entrySet()) {
Thread t = entry.getKey();
String name = t.getName();
if (name.equals("java.lang.ProcessManager")) {
System.out.println("process manager: " + t.getState());
found = true;
}
}
if (! found) {
System.out.println("process manager: nonexistent");
}
}
}
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