protected synchronized void append(String x, boolean newline) {
PrintStream tmp = type == 1 ? stdout.get() : stderr.get();
if (tmp == null) return;
if (newline) tmp.println(x);
else tmp.print(x);
}
protected void error(String msg) {
old_stderr.println(msg);
}
protected void println(String msg) {
old_stdout.println(msg);
}
protected static void print(PrintStream out, String msg, String classname, String method_name) {
out.println(
msg + "[" + Thread.currentThread().getId() + "] " + classname + "." + method_name + "()");
}