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假设我有一个NetThread
(定义如下)的对象,名为nt
。我已经初始化并启动它停止网络接收器线程
nt = new NetThread(port, rs);
nt.setDaemon(true);
nt.setPriority(Thread.MAX_PRIORITY);
nt.start();
现在我希望能够在执行过程中停止这个线程的任何一点。我可以通过致电nt.interrupt()
来完成此操作。
但是,我想我会尝试做一些更有意义的事情:在NetThread
内创建一个名为StopListening()
的方法。
虽然nt
正在运行,我打电话nt.StopListening()
。没有。
线程只是继续运行。我错过了什么?为什么这不起作用?
public class NetThread extends Thread {
int port;
private static int PAYLOAD_MAX = 10000;
private static int NET_SO_TIMEOUT = 0;
private RunStats rs;
private boolean stopflag = false;
private StageCode stage;
NetThread(int port_number, RunStats runstats)
{
rs = runstats;
port = port_number;
stage = StageCode.STAGE_WAIT;
}
public synchronized void stopListening()
{
Log.d(C.DTAG, "stopListening() was called...");
stopflag=true;
}
@Override
public void run()
{
receiveData();
Log.d(C.DTAG, "Network thread is finished.");
}
public void receiveData()
{
// request permission to do network operations in manifest file...done
Log.d(C.DTAG, "network thread has started.");
// start the network side of things
DatagramSocket sock = null;
DatagramPacket pkt = null;
try
{
byte[] data = new byte[PAYLOAD_MAX];
sock = new DatagramSocket(port);
sock.setSoTimeout(NET_SO_TIMEOUT);
pkt = new DatagramPacket(data, 0, PAYLOAD_MAX);
while (!stopflag)
{
Thread.sleep(0); // allow for an interrupt
try
{
sock.receive(pkt);
int length = pkt.getLength();
processPayload(pkt.getData(), length);
}
catch (InterruptedIOException e)
{
// thrown when a timeout occurs
Log.d(C.DTAG, "net: no packets yet");
}
}
Log.d(C.DTAG, "done receiving.");
if (sock != null) sock.close();
}
catch (InterruptedException x)
{
Log.d(C.DTAG, "net: was interrupted.");
}
catch (SocketException e)
{
Log.d(C.DTAG, "net: SocketException");
e.printStackTrace();
}
catch (IOException e)
{
Log.d(C.DTAG, "net: IOException");
e.printStackTrace();
}
if (sock != null) sock.close();
}
public void processPayload(byte[] data, int length)
{
if (length < 20) return;
int sc = data[ 0] & 0x000000FF | data[ 1]<<8 & 0x0000FF00 | data[ 2]<<16 & 0x00FF0000 | data[ 3]<<24 & 0xFF000000;
int seq = data[ 4] & 0x000000FF | data[ 5]<<8 & 0x0000FF00 | data[ 6]<<16 & 0x00FF0000 | data[ 7]<<24 & 0xFF000000;
int i = data[ 8] & 0x000000FF | data[ 9]<<8 & 0x0000FF00 | data[10]<<16 & 0x00FF0000 | data[11]<<24 & 0xFF000000;
int s = data[12] & 0x000000FF | data[13]<<8 & 0x0000FF00 | data[14]<<16 & 0x00FF0000 | data[15]<<24 & 0xFF000000;
int n = data[16] & 0x000000FF | data[17]<<8 & 0x0000FF00 | data[18]<<16 & 0x00FF0000 | data[19]<<24 & 0xFF000000;
StageCode sc2 = null;
switch (sc)
{
case 20: sc2 = StageCode.STAGE_INIT; break;
case 30: sc2 = StageCode.STAGE_TEST; break;
case 40: sc2 = StageCode.STAGE_STOP; break;
}
TestPacketHeader tph = new TestPacketHeader(sc2, seq, i, s, n);
rs.RegisterReceivedPacket(tph);
if (sc2 == StageCode.STAGE_STOP) stopflag = true;
}
public synchronized StageCode status()
{
return stage;
}
}
你能不能请说,为什么它更好?我总是使用'while(!isInterrupted())'并调用'myThread.interrupt();'。它工作得很好 – MalaKa
其实你是对的,我正在考虑一个异步杀死,这不是中断。 –
我编辑了我的答案。 –