我在Java中有一个用于UDP数据包的数据包侦听器线程以及2-3个其他线程。
它一直运行到今天,但现在javaw.exe进程已经开始使用CONSTANT 50%CPU了。
这是我的代码。
public class PacketListenerThread implements Runnable {
private SocketAddress receivedSocketAddress;
private DatagramChannel channel;
private ExecutorService pool;
public PacketListenerThread(DatagramChannel channel, ExecutorService pool) {
this.channel = channel;
this.pool = pool;
}
@Override
public void run() {
while (true) {
receivedSocketAddress = null;
ByteBuffer recvbuf = ByteBuffer.allocate(1400);
recvbuf.clear();
try {
receivedSocketAddress = channel.receive(recvbuf);
} catch (IOException e) {
e.printStackTrace();
}
if (receivedSocketAddress != null) {
pool.submit(new PacketHandlerRunnable(new TaskObject(receivedSocketAddress, recvbuf)));
}
}
}
}
我已停止所有其他线程,但此线程仍然使用“CONSTANT”50%CPU。
答案 0 :(得分:2)
请参阅Javadoc:
如果数据报立即可用,或者此通道处于阻塞模式且最终可用,则将数据报复制到给定的字节缓冲区中并返回其源地址。如果此通道处于非阻塞模式且数据报不能立即可用,则此方法立即返回null。
也许你对channel.receive(recvbuf)的调用没有阻塞,所以你以无限速度循环,这解释了你的CPU负载。