我有一个Windows窗体应用程序,我正在检查所有串口,以查看特定设备是否已连接。
这就是我脱掉每个线程的方式。下面的代码已经从主要的gui线程中分离出来。
foreach (cpsComms.cpsSerial ser in availPorts)
{
Thread t = new Thread(new ParameterizedThreadStart(lookForValidDev));
t.Start((object)ser);//start thread and pass it the port
}
我希望下一行代码等到所有线程都完成。
我已经尝试在那里使用t.join
,但这只是线性处理它们。
答案 0 :(得分:40)
List<Thread> threads = new List<Thread>();
foreach (cpsComms.cpsSerial ser in availPorts)
{
Thread t = new Thread(new ParameterizedThreadStart(lookForValidDev));
t.Start((object)ser);//start thread and pass it the port
threads.Add(t);
}
foreach(var thread in threads)
{
thread.Join();
}
修改强>
我回头看这个,我更喜欢以下
availPorts.Select(ser =>
{
Thread thread = new Thread(lookForValidDev);
thread.Start(ser);
return thread;
}).ToList().ForEach(t => t.Join());
答案 1 :(得分:16)
使用AutoResetEvent和ManualResetEvent类:
private ManualResetEvent manual = new ManualResetEvent(false);
void Main(string[] args)
{
AutoResetEvent[] autos = new AutoResetEvent[availPorts.Count];
manual.Set();
for (int i = 0; i < availPorts.Count - 1; i++)
{
AutoResetEvent Auto = new AutoResetEvent(false);
autos[i] = Auto;
Thread t = new Thread(() => lookForValidDev(Auto, (object)availPorts[i]));
t.Start();//start thread and pass it the port
}
WaitHandle.WaitAll(autos);
manual.Reset();
}
void lookForValidDev(AutoResetEvent auto, object obj)
{
try
{
manual.WaitOne();
// do something with obj
}
catch (Exception)
{
}
finally
{
auto.Set();
}
}
答案 2 :(得分:7)
最简单,最安全的方法是使用CountdownEvent。请参阅Albahari。
答案 3 :(得分:3)
您可以使用CountDownLatch:
public class CountDownLatch
{
private int m_remain;
private EventWaitHandle m_event;
public CountDownLatch(int count)
{
Reset(count);
}
public void Reset(int count)
{
if (count < 0)
throw new ArgumentOutOfRangeException();
m_remain = count;
m_event = new ManualResetEvent(false);
if (m_remain == 0)
{
m_event.Set();
}
}
public void Signal()
{
// The last thread to signal also sets the event.
if (Interlocked.Decrement(ref m_remain) == 0)
m_event.Set();
}
public void Wait()
{
m_event.WaitOne();
}
}
如何使用它的示例:
void StartThreads
{
CountDownLatch latch = new CountDownLatch(availPorts.Count);
foreach (cpsComms.cpsSerial ser in availPorts)
{
Thread t = new Thread(new ParameterizedThreadStart(lookForValidDev));
//start thread and pass it the port and the latch
t.Start((object)new Pair(ser, latch));
}
DoSomeWork();
// wait for all the threads to signal
latch.Wait();
DoSomeMoreWork();
}
// In each thread
void NameOfRunMethod
{
while(running)
{
// do work
}
// Signal that the thread is done running
latch.Signal();
}
答案 4 :(得分:2)
在生成线程后,将线程结果存储在列表中并迭代列表 - 然后在迭代调用连接期间。你仍然线性地加入,但它应该做你想要的。