我正在嘗試使用Monitor
在C#
中實施生產者/消費者類。 想法是,消費者必須阻止,直到生產者有消費者的一些項目,但生產者應該繼續生產。 我的製作人生產一些物品,然後在再次生產之前等待/睡眠一段時間。爲什麼我的製片人有時會永遠封鎖?
我看到生產者從未從Thread.Sleep(time)
醒來的問題。 也許某處存在死鎖情況。
請幫我理解這一點。
就像一張紙條,我不希望使用BlockingCollection
... 這裏是我的代碼...
public class ProducerConsumerEx
{
private object _objLocker = new object();
private Thread _tProducer;
private Queue<string> _producerQueue;
private bool _keepProducing;
public ProducerConsumerEx()
{
_keepProducing = false;
_producerQueue = new Queue<string>();
_tProducer = new Thread(Produce);
_tProducer.IsBackground = true;
}
private void Produce()
{
while (_keepProducing)
{
Console.WriteLine($"PRODUCER {Thread.CurrentThread.ManagedThreadId} LOOP");
lock (_objLocker)
{
string item = DateTime.Now.ToString("HH:mm:ss");
_producerQueue.Enqueue(item);
Console.WriteLine($"PRODUCER {DateTime.Now.ToString("HH:mm:ss")} Thread {Thread.CurrentThread.ManagedThreadId} Inserted {item}");
Monitor.Pulse(_objLocker);
Console.WriteLine($"PRODUCER {DateTime.Now.ToString("HH:mm:ss")} Thread {Thread.CurrentThread.ManagedThreadId} AF Pulse {item}");
}
Console.WriteLine($"PRODUCER {DateTime.Now.ToString("HH:mm:ss")} Thread {Thread.CurrentThread.ManagedThreadId} BF Sleep");
Thread.Sleep(10000);
Console.WriteLine($"PRODUCER {DateTime.Now.ToString("HH:mm:ss")} Thread {Thread.CurrentThread.ManagedThreadId} AF Sleep");
}
}
public void Start()
{
if (!_keepProducing)
{
_tProducer.Start();
_keepProducing = true;
}
}
public string Consume()
{
string val = default(string);
Console.WriteLine($"CONSUMER {DateTime.Now.ToString("HH:mm:ss")} Thread {Thread.CurrentThread.ManagedThreadId} BF Consume");
lock (_objLocker)
{
Console.WriteLine($"CONSUMER {DateTime.Now.ToString("HH:mm:ss")} Thread {Thread.CurrentThread.ManagedThreadId} BF Consume Inside");
if (_producerQueue.Count > 0)
{
val = _producerQueue.Dequeue();
}
else
{
Console.WriteLine($"CONSUMER {DateTime.Now.ToString("HH:mm:ss")} Thread {Thread.CurrentThread.ManagedThreadId} WAITING");
Monitor.Wait(_objLocker);
//
if (_producerQueue.Count > 0)
{
val = _producerQueue.Dequeue();
}
}
}
return val;
}
}
而且使用這個類是這樣
static void Main(string[] args)
{
ProducerConsumerEx pc = new ProducerConsumerEx();
pc.Start();
while (true)
{
string t = pc.Consume();
Console.WriteLine($"Main {t}");
}
}
你應該切換線'_tProducer.Start();'和'_keepProducing = TRUE;',你永遠不知道如果線程在'_keepProducing = true;'之前或之後啓動。 –
確定'Thread.Sleep'沒有執行後'Console.WriteLine'? – slawekwin
@slawekwin是的,我相信,Console.WriteLine沒有執行,這是我不明白... –