C# 使用共享资源创建多个线程
好的，我有一个问题，创建一堆线程，它们都使用同一个对象。我的想法是，我有一个项目的“队列”（又名列表），项目应该一个接一个地处理，直到所有项目都处理完毕。目前，这只适用于一个线程（当我更改threadcount=1时），但当我尝试将其设置为threadcount=2，并且线程正在竞争时，这一切都会发生。。。。一个糟糕的地方 下面是我制作的一些速成课程，以提供一个我试图完成的详细示例。。。我有一个很好的预感，它将与使用“锁”关键字有关，但我不是100%确定如何使用它 在您的答案中，请给出一个解决方案代码示例，以使您的答案清晰。谢谢 代码：C# 使用共享资源创建多个线程,c#,multithreading,task,C#,Multithreading,Task,好的，我有一个问题，创建一堆线程，它们都使用同一个对象。我的想法是，我有一个项目的“队列”（又名列表），项目应该一个接一个地处理，直到所有项目都处理完毕。目前，这只适用于一个线程（当我更改threadcount=1时），但当我尝试将其设置为threadcount=2，并且线程正在竞争时，这一切都会发生。。。。一个糟糕的地方 下面是我制作的一些速成课程，以提供一个我试图完成的详细示例。。。我有一个很好的预感，它将与使用“锁”关键字有关，但我不是100%确定如何使用它 在您的答案中，请给出一个解决方
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Diagnostics;
namespace MyNamespace
{
class Class1
{
static void Main()
{
Debug.WriteLine("starting application...");
int threadcount = 2;
List<Task> tasks = new List<Task>();
List<Class2> myObjs = new List<Class2>();
myObjs.Add(new Class2("list item 1"));
myObjs.Add(new Class2("list item 2"));
myObjs.Add(new Class2("list item 3"));
myObjs.Add(new Class2("list item 4"));
myObjs.Add(new Class2("list item 5"));
myObjs.Add(new Class2("list item 6"));
myObjs.Add(new Class2("list item 7"));
myObjs.Add(new Class2("list item 8"));
myObjs.Add(new Class2("list item 9"));
Debug.WriteLine("about to create " + threadcount + " task(s)...");
int t = 0;
do
{
t++;
Debug.WriteLine("creating task " + t);
Class3 starter = new Class3();
tasks.Add(starter.StartNewThread(myObjs));
} while (t < threadcount);
Task.WaitAll(tasks.ToArray());
Debug.WriteLine("all tasks have completed");
}
}
class Class2
{
private string m_status;
public string status
{
get { return m_status; }
set { m_status = value; }
}
private string m_text;
public string text
{
get { return m_text; }
set { m_text = value; }
}
private int m_threadid;
public int threadid
{
get { return m_threadid; }
set { m_threadid = value; }
}
public Class2()
{
m_status = "created";
m_text = "";
m_threadid = 0;
}
public Class2(string intext)
{
m_status = "created";
m_text = intext;
m_threadid = 0;
}
}
class Class3
{
public Task StartNewThread(List<Class2> taskObjs)
{
Task<List<Class2>> task = Task.Factory
.StartNew(() => threadTaskWorker(taskObjs),
CancellationToken.None,
TaskCreationOptions.None,
TaskScheduler.Default)
.ContinueWith(completed_task => threadTaskComplete(completed_task.Result));
return task;
}
private List<Class2> threadTaskWorker(List<Class2> taskObjs)
{
Thread.CurrentThread.Name = "thread" + Thread.CurrentThread.ManagedThreadId;
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " created.");
//Process all items in the list that need processing
Class2 nextObj;
do
{
//Look for next item in list that needs processing
nextObj = null;
foreach (Class2 taskObj in taskObjs)
{
if (taskObj.status == "created")
{
nextObj = taskObj;
break;
}
}
if (nextObj != null)
{
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId +
" is handling " + nextObj.text);
nextObj.status = "processing";
nextObj.threadid = Thread.CurrentThread.ManagedThreadId;
nextObj.text += "(handled)";
Random rnd = new Random();
Thread.Sleep(rnd.Next(300, 3000));
nextObj.status = "completed";
}
} while (nextObj != null);
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " destroyed.");
//Return the task object
return taskObjs;
}
private List<Class2> threadTaskComplete(List<Class2> taskObjs)
{
Debug.WriteLine("a thread has finished, here are the current item's status...");
foreach (Class2 taskObj in taskObjs)
{
Debug.WriteLine(taskObj.text +
" thread:" + taskObj.threadid +
" status:" + taskObj.status);
}
//Return the task object
return taskObjs;
}
}
}
/*
starting application...
about to create 2 task(s)...
creating task 1
creating task 2
thread #10 created.
thread #11 created.
thread #10 is handling list item 1
thread #11 is handling list item 1
thread #10 is handling list item 2
thread #11 is handling list item 2
thread #10 is handling list item 3
thread #11 is handling list item 4
thread #10 is handling list item 5
thread #11 is handling list item 5
thread #10 is handling list item 6
thread #11 is handling list item 6
thread #10 is handling list item 7
thread #11 is handling list item 8
thread #10 is handling list item 9
thread #11 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled)(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled)(handled) thread:11 status:completed
list item 6(handled)(handled) thread:11 status:completed
list item 7(handled) thread:10 status:completed
list item 8(handled) thread:11 status:completed
list item 9(handled) thread:10 status:processing
thread #10 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled)(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled)(handled) thread:11 status:completed
list item 6(handled)(handled) thread:11 status:completed
list item 7(handled) thread:10 status:completed
list item 8(handled) thread:11 status:completed
list item 9(handled) thread:10 status:completed
all tasks have completed
*/
/*
starting application...
about to create 2 task(s)...
creating task 1
creating task 2
thread #10 created.
thread #11 created.
thread #10 is handling list item 1
thread #11 is handling list item 2
thread #10 is handling list item 3
thread #11 is handling list item 4
thread #10 is handling list item 5
thread #10 is handling list item 6
thread #11 is handling list item 7
thread #10 is handling list item 8
thread #11 is handling list item 9
thread #10 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:10 status:completed
list item 2(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled) thread:10 status:completed
list item 6(handled) thread:10 status:completed
list item 7(handled) thread:11 status:completed
list item 8(handled) thread:10 status:completed
list item 9(handled) thread:11 status:processing
thread #11 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:10 status:completed
list item 2(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled) thread:10 status:completed
list item 6(handled) thread:10 status:completed
list item 7(handled) thread:11 status:completed
list item 8(handled) thread:10 status:completed
list item 9(handled) thread:11 status:completed
all tasks have completed
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Diagnostics;
namespace MyNamespace
{
class Class1
{
static void Main()
{
Debug.WriteLine("starting application...");
int threadcount = 4;
List<Task> tasks = new List<Task>();
List<Class2> myObjs = new List<Class2>();
myObjs.Add(new Class2("list item 1"));
myObjs.Add(new Class2("list item 2"));
myObjs.Add(new Class2("list item 3"));
myObjs.Add(new Class2("list item 4"));
myObjs.Add(new Class2("list item 5"));
myObjs.Add(new Class2("list item 6"));
myObjs.Add(new Class2("list item 7"));
myObjs.Add(new Class2("list item 8"));
myObjs.Add(new Class2("list item 9"));
Debug.WriteLine("about to create " + threadcount + " task(s)...");
int t = 0;
do
{
t++;
Debug.WriteLine("creating task " + t);
Class3 starter = new Class3();
tasks.Add(starter.StartNewThread(myObjs));
} while (t < threadcount);
Task.WaitAll(tasks.ToArray());
Debug.WriteLine("all tasks have completed");
}
}
class Class2
{
private object m_locker = new object();
public object locker
{
get { return m_locker; }
set { m_locker = value; }
}
private string m_status;
public string status
{
get { return m_status; }
set { m_status = value; }
}
private string m_text;
public string text
{
get { return m_text; }
set { m_text = value; }
}
private int m_threadid;
public int threadid
{
get { return m_threadid; }
set { m_threadid = value; }
}
public Class2()
{
m_status = "created";
m_text = "";
m_threadid = 0;
}
public Class2(string intext)
{
m_status = "created";
m_text = intext;
m_threadid = 0;
}
}
class Class3
{
public Task StartNewThread(List<Class2> taskObjs)
{
Task<List<Class2>> task = Task.Factory
.StartNew(() => threadTaskWorker(taskObjs),
CancellationToken.None,
TaskCreationOptions.None,
TaskScheduler.Default)
.ContinueWith(completed_task => threadTaskComplete(completed_task.Result));
return task;
}
private List<Class2> threadTaskWorker(List<Class2> taskObjs)
{
Thread.CurrentThread.Name = "thread" + Thread.CurrentThread.ManagedThreadId;
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " created.");
//Process all items in the list that need processing
Class2 nextObj;
do
{
//Look for next item in list that needs processing
nextObj = null;
foreach (Class2 taskObj in taskObjs)
{
nextObj = taskObj;
lock (nextObj.locker)
{
if (taskObj.status == "created")
{
nextObj.status = "processing";
break;
}
else nextObj = null;
}
}
if (nextObj != null)
{
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId +
" is handling " + nextObj.text);
nextObj.threadid = Thread.CurrentThread.ManagedThreadId;
nextObj.text += "(handled)";
Random rnd = new Random();
Thread.Sleep(rnd.Next(300, 3000));
nextObj.status = "completed";
}
} while (nextObj != null);
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " destroyed.");
//Return the task object
return taskObjs;
}
private List<Class2> threadTaskComplete(List<Class2> taskObjs)
{
Debug.WriteLine("a thread has finished, here are the current item's status...");
foreach (Class2 taskObj in taskObjs)
{
Debug.WriteLine(taskObj.text +
" thread:" + taskObj.threadid +
" status:" + taskObj.status);
}
//Return the task object
return taskObjs;
}
}
}
/*
starting application...
about to create 4 task(s)...
creating task 1
creating task 2
creating task 3
creating task 4
thread #11 created.
thread #13 created.
thread #12 created.
thread #12 is handling list item 3
thread #11 is handling list item 1
thread #13 is handling list item 2
thread #14 created.
thread #14 is handling list item 4
thread #12 is handling list item 5
thread #11 is handling list item 6
thread #13 is handling list item 7
thread #14 is handling list item 8
thread #12 is handling list item 9
thread #11 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:processing
list item 8(handled) thread:14 status:processing
list item 9(handled) thread:12 status:processing
thread #13 destroyed.
thread #14 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 8(handled) thread:14 status:completed
list item 9(handled) thread:12 status:processing
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:completed
list item 8(handled) thread:14 status:completed
list item 9(handled) thread:12 status:processing
thread #12 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:completed
list item 8(handled) thread:14 status:completed
list item 9(handled) thread:12 status:completed
all tasks have completed
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Diagnostics;
namespace MyNamespace
{
class Class1
{
static void Main()
{
Debug.WriteLine("starting application...");
int threadcount = 2;
List<Task> tasks = new List<Task>();
List<Class2> myObjs = new List<Class2>();
myObjs.Add(new Class2("list item 1"));
myObjs.Add(new Class2("list item 2"));
myObjs.Add(new Class2("list item 3"));
myObjs.Add(new Class2("list item 4"));
myObjs.Add(new Class2("list item 5"));
myObjs.Add(new Class2("list item 6"));
myObjs.Add(new Class2("list item 7"));
myObjs.Add(new Class2("list item 8"));
myObjs.Add(new Class2("list item 9"));
Debug.WriteLine("about to create " + threadcount + " task(s)...");
int t = 0;
do
{
t++;
Debug.WriteLine("creating task " + t);
Class3 starter = new Class3();
tasks.Add(starter.StartNewThread(myObjs));
} while (t < threadcount);
Task.WaitAll(tasks.ToArray());
Debug.WriteLine("all tasks have completed");
}
}
class Class2
{
private string m_status;
public string status
{
get { return m_status; }
set { m_status = value; }
}
private string m_text;
public string text
{
get { return m_text; }
set { m_text = value; }
}
private int m_threadid;
public int threadid
{
get { return m_threadid; }
set { m_threadid = value; }
}
public Class2()
{
m_status = "created";
m_text = "";
m_threadid = 0;
}
public Class2(string intext)
{
m_status = "created";
m_text = intext;
m_threadid = 0;
}
}
class Class3
{
public Task StartNewThread(List<Class2> taskObjs)
{
Task<List<Class2>> task = Task.Factory
.StartNew(() => threadTaskWorker(taskObjs),
CancellationToken.None,
TaskCreationOptions.None,
TaskScheduler.Default)
.ContinueWith(completed_task => threadTaskComplete(completed_task.Result));
return task;
}
private List<Class2> threadTaskWorker(List<Class2> taskObjs)
{
Thread.CurrentThread.Name = "thread" + Thread.CurrentThread.ManagedThreadId;
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " created.");
//Process all items in the list that need processing
Class2 nextObj;
do
{
//Look for next item in list that needs processing
nextObj = null;
foreach (Class2 taskObj in taskObjs)
{
if (taskObj.status == "created")
{
nextObj = taskObj;
break;
}
}
if (nextObj != null)
{
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId +
" is handling " + nextObj.text);
nextObj.status = "processing";
nextObj.threadid = Thread.CurrentThread.ManagedThreadId;
nextObj.text += "(handled)";
Random rnd = new Random();
Thread.Sleep(rnd.Next(300, 3000));
nextObj.status = "completed";
}
} while (nextObj != null);
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " destroyed.");
//Return the task object
return taskObjs;
}
private List<Class2> threadTaskComplete(List<Class2> taskObjs)
{
Debug.WriteLine("a thread has finished, here are the current item's status...");
foreach (Class2 taskObj in taskObjs)
{
Debug.WriteLine(taskObj.text +
" thread:" + taskObj.threadid +
" status:" + taskObj.status);
}
//Return the task object
return taskObjs;
}
}
}
/*
starting application...
about to create 2 task(s)...
creating task 1
creating task 2
thread #10 created.
thread #11 created.
thread #10 is handling list item 1
thread #11 is handling list item 1
thread #10 is handling list item 2
thread #11 is handling list item 2
thread #10 is handling list item 3
thread #11 is handling list item 4
thread #10 is handling list item 5
thread #11 is handling list item 5
thread #10 is handling list item 6
thread #11 is handling list item 6
thread #10 is handling list item 7
thread #11 is handling list item 8
thread #10 is handling list item 9
thread #11 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled)(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled)(handled) thread:11 status:completed
list item 6(handled)(handled) thread:11 status:completed
list item 7(handled) thread:10 status:completed
list item 8(handled) thread:11 status:completed
list item 9(handled) thread:10 status:processing
thread #10 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled)(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled)(handled) thread:11 status:completed
list item 6(handled)(handled) thread:11 status:completed
list item 7(handled) thread:10 status:completed
list item 8(handled) thread:11 status:completed
list item 9(handled) thread:10 status:completed
all tasks have completed
*/
/*
starting application...
about to create 2 task(s)...
creating task 1
creating task 2
thread #10 created.
thread #11 created.
thread #10 is handling list item 1
thread #11 is handling list item 2
thread #10 is handling list item 3
thread #11 is handling list item 4
thread #10 is handling list item 5
thread #10 is handling list item 6
thread #11 is handling list item 7
thread #10 is handling list item 8
thread #11 is handling list item 9
thread #10 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:10 status:completed
list item 2(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled) thread:10 status:completed
list item 6(handled) thread:10 status:completed
list item 7(handled) thread:11 status:completed
list item 8(handled) thread:10 status:completed
list item 9(handled) thread:11 status:processing
thread #11 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:10 status:completed
list item 2(handled) thread:11 status:completed
list item 3(handled) thread:10 status:completed
list item 4(handled) thread:11 status:completed
list item 5(handled) thread:10 status:completed
list item 6(handled) thread:10 status:completed
list item 7(handled) thread:11 status:completed
list item 8(handled) thread:10 status:completed
list item 9(handled) thread:11 status:completed
all tasks have completed
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.Diagnostics;
namespace MyNamespace
{
class Class1
{
static void Main()
{
Debug.WriteLine("starting application...");
int threadcount = 4;
List<Task> tasks = new List<Task>();
List<Class2> myObjs = new List<Class2>();
myObjs.Add(new Class2("list item 1"));
myObjs.Add(new Class2("list item 2"));
myObjs.Add(new Class2("list item 3"));
myObjs.Add(new Class2("list item 4"));
myObjs.Add(new Class2("list item 5"));
myObjs.Add(new Class2("list item 6"));
myObjs.Add(new Class2("list item 7"));
myObjs.Add(new Class2("list item 8"));
myObjs.Add(new Class2("list item 9"));
Debug.WriteLine("about to create " + threadcount + " task(s)...");
int t = 0;
do
{
t++;
Debug.WriteLine("creating task " + t);
Class3 starter = new Class3();
tasks.Add(starter.StartNewThread(myObjs));
} while (t < threadcount);
Task.WaitAll(tasks.ToArray());
Debug.WriteLine("all tasks have completed");
}
}
class Class2
{
private object m_locker = new object();
public object locker
{
get { return m_locker; }
set { m_locker = value; }
}
private string m_status;
public string status
{
get { return m_status; }
set { m_status = value; }
}
private string m_text;
public string text
{
get { return m_text; }
set { m_text = value; }
}
private int m_threadid;
public int threadid
{
get { return m_threadid; }
set { m_threadid = value; }
}
public Class2()
{
m_status = "created";
m_text = "";
m_threadid = 0;
}
public Class2(string intext)
{
m_status = "created";
m_text = intext;
m_threadid = 0;
}
}
class Class3
{
public Task StartNewThread(List<Class2> taskObjs)
{
Task<List<Class2>> task = Task.Factory
.StartNew(() => threadTaskWorker(taskObjs),
CancellationToken.None,
TaskCreationOptions.None,
TaskScheduler.Default)
.ContinueWith(completed_task => threadTaskComplete(completed_task.Result));
return task;
}
private List<Class2> threadTaskWorker(List<Class2> taskObjs)
{
Thread.CurrentThread.Name = "thread" + Thread.CurrentThread.ManagedThreadId;
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " created.");
//Process all items in the list that need processing
Class2 nextObj;
do
{
//Look for next item in list that needs processing
nextObj = null;
foreach (Class2 taskObj in taskObjs)
{
nextObj = taskObj;
lock (nextObj.locker)
{
if (taskObj.status == "created")
{
nextObj.status = "processing";
break;
}
else nextObj = null;
}
}
if (nextObj != null)
{
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId +
" is handling " + nextObj.text);
nextObj.threadid = Thread.CurrentThread.ManagedThreadId;
nextObj.text += "(handled)";
Random rnd = new Random();
Thread.Sleep(rnd.Next(300, 3000));
nextObj.status = "completed";
}
} while (nextObj != null);
Debug.WriteLine("thread #" + Thread.CurrentThread.ManagedThreadId + " destroyed.");
//Return the task object
return taskObjs;
}
private List<Class2> threadTaskComplete(List<Class2> taskObjs)
{
Debug.WriteLine("a thread has finished, here are the current item's status...");
foreach (Class2 taskObj in taskObjs)
{
Debug.WriteLine(taskObj.text +
" thread:" + taskObj.threadid +
" status:" + taskObj.status);
}
//Return the task object
return taskObjs;
}
}
}
/*
starting application...
about to create 4 task(s)...
creating task 1
creating task 2
creating task 3
creating task 4
thread #11 created.
thread #13 created.
thread #12 created.
thread #12 is handling list item 3
thread #11 is handling list item 1
thread #13 is handling list item 2
thread #14 created.
thread #14 is handling list item 4
thread #12 is handling list item 5
thread #11 is handling list item 6
thread #13 is handling list item 7
thread #14 is handling list item 8
thread #12 is handling list item 9
thread #11 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:processing
list item 8(handled) thread:14 status:processing
list item 9(handled) thread:12 status:processing
thread #13 destroyed.
thread #14 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 8(handled) thread:14 status:completed
list item 9(handled) thread:12 status:processing
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:completed
list item 8(handled) thread:14 status:completed
list item 9(handled) thread:12 status:processing
thread #12 destroyed.
a thread has finished, here are the current item's status...
list item 1(handled) thread:11 status:completed
list item 2(handled) thread:13 status:completed
list item 3(handled) thread:12 status:completed
list item 4(handled) thread:14 status:completed
list item 5(handled) thread:12 status:completed
list item 6(handled) thread:11 status:completed
list item 7(handled) thread:13 status:completed
list item 8(handled) thread:14 status:completed
list item 9(handled) thread:12 status:completed
all tasks have completed
*/
如果您确实想要一个先进先出的项目队列，您可以同时访问这些项目，然后使用它们。使用TryDequeue（）方法检索对象将确保每个对象只被访问一次 例如：
var cq = new ConcurrentQueue<T>();
//populate queue
...
//process queue until empty -- this can be done in parallel
T item;
while(cq.trydequeue(out item)){
//process item
}
//queue was empty when we tried to retrieve something.
var cq=new ConcurrentQueue（）；
//填充队列
...
//处理队列直到为空--这可以并行完成
T项；
while（cq.trydequeue（out项））{
//过程项
}
//当我们试图检索某物时，队列是空的。
var cq = new ConcurrentQueue<T>();
//populate queue
...
//process queue until empty -- this can be done in parallel
T item;
while(cq.trydequeue(out item)){
//process item
}
//queue was empty when we tried to retrieve something.
var cq=new ConcurrentQueue（）；
//填充队列
...
//处理队列直到为空--这可以并行完成
T项；
while（cq.trydequeue（out项））{
//过程项
}
//当我们试图检索某物时，队列是空的。
var cq = new ConcurrentQueue<T>();
//populate queue
...
//process queue until empty -- this can be done in parallel
T item;
while(cq.trydequeue(out item)){
//process item
}
//queue was empty when we tried to retrieve something.
var cq=new ConcurrentQueue（）；
//填充队列
...
//处理队列直到为空--这可以并行完成
T项；
while（cq.trydequeue（out项））{
//过程项
}
//当我们试图检索某物时，队列是空的。
var cq = new ConcurrentQueue<T>();
//populate queue
...
//process queue until empty -- this can be done in parallel
T item;
while(cq.trydequeue(out item)){
//process item
}
//queue was empty when we tried to retrieve something.
var cq=new ConcurrentQueue（）；
//填充队列
...
//处理队列直到为空--这可以并行完成
T项；
while（cq.trydequeue（out项））{
//过程项
}
//当我们试图检索某物时，队列是空的。
ConcurrentQueue锁定对象锁（对象）/// any resource shared between threads
private List<int> sharedResource = new List<int>();
/// best practice is to use a private object to synchronise threads
/// see: https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx
private object resourceLock = new object();
void MethodAccessingSharedResource()
{
/// Only one thread can acquire the lock on resourceLock at a time.
lock (resourceLock)
{
/// The thread can safely access the shared resource here.
/// Other threads will wait at lock(resourceLock) until
/// this thread gives up the lock.
}
/// The thread has released the lock on resourceLock.
/// Another thread can now enter the lock(){} code block.
}
///线程之间共享的任何资源
私有列表sharedResource=新列表（）；
///最佳实践是使用私有对象来同步线程
///见：https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx
私有对象resourceLock=新对象（）；
void方法访问共享资源（）
{
///一次只能有一个线程获取resourceLock上的锁。
锁（资源锁）
{
///线程可以在这里安全地访问共享资源。
///其他线程将在锁（resourceLock）处等待，直到
///这根线断开了锁。
}
///线程已释放resourceLock上的锁。
///另一个线程现在可以进入lock（）{}代码块。
}
ConcurrentQueue锁定对象锁（对象）/// any resource shared between threads
private List<int> sharedResource = new List<int>();
/// best practice is to use a private object to synchronise threads
/// see: https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx
private object resourceLock = new object();
void MethodAccessingSharedResource()
{
/// Only one thread can acquire the lock on resourceLock at a time.
lock (resourceLock)
{
/// The thread can safely access the shared resource here.
/// Other threads will wait at lock(resourceLock) until
/// this thread gives up the lock.
}
/// The thread has released the lock on resourceLock.
/// Another thread can now enter the lock(){} code block.
}
///线程之间共享的任何资源
私有列表sharedResource=新列表（）；
///最佳实践是使用私有对象来同步线程
///见：https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx
私有对象resourceLock=新对象（）；
void方法访问共享资源（）
{
///一次只能有一个线程获取resourceLock上的锁。
锁（资源锁）
{
///线程可以在这里安全地访问共享资源。
///其他线程将在锁（resourceLock）处等待，直到
///这根线断开了锁。
}
///线程已释放resourceLock上的锁。
///另一个线程现在可以进入lock（）{}代码块。
}
ConcurrentQueue锁定对象的锁时，遇到锁（对象）
语句的其他线程必须等待