.net异步与多线程
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一直不清楚异步与多线程的区别,不知道回调函数是在新线程还是原线程执行。
上网没查找到,自已研究。
using System;
using System.IO;
using System.Threading;
namespace test_异步
...{
class Class1
...{
[STAThread]
static void Main(string[] args)
...{
int i=0;
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
while(true)...{
System.Console.WriteLine("main_"+i++);
Thread.Sleep(500);
}
}
public static void endWrite(IAsyncResult ir)
...{
((FileStream)ir.AsyncState).Close();
int i=0;
while(true)
...{
System.Console.WriteLine("endwrite_"+i++);
Thread.Sleep(100);
}
}
}
}
using System.IO;
using System.Threading;
namespace test_异步
...{
class Class1
...{
[STAThread]
static void Main(string[] args)
...{
int i=0;
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
while(true)...{
System.Console.WriteLine("main_"+i++);
Thread.Sleep(500);
}
}
public static void endWrite(IAsyncResult ir)
...{
((FileStream)ir.AsyncState).Close();
int i=0;
while(true)
...{
System.Console.WriteLine("endwrite_"+i++);
Thread.Sleep(100);
}
}
}
}
上面的结果是每输出5个 endwrite_i 输出一个 main_i ,说明异步也是在不同线程中运行,和多线程没什么不同。
但是MSDN和网上的代码上很多代码都是在回调函数中再次调用异步函数,这样岂不是会产生很多进程?不过MSDN中都这样写也许不是这样,再次测试。
using System;
using System.IO;
using System.Threading;
using System.Runtime.InteropServices;
namespace test_异步
...{
class Class1
...{
[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();
[STAThread]
static void Main(string[] args)
...{
int i=0;
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
while(true)...{
System.Console.WriteLine("main_"+i++);
Thread.Sleep(100);
}
}
public static void endWrite(IAsyncResult ir)
...{
Thread.Sleep(100);
((FileStream)ir.AsyncState).Close();
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
System.Console.WriteLine("endwrite_"+GetCurrentThreadId());
}
}
}
using System.IO;
using System.Threading;
using System.Runtime.InteropServices;
namespace test_异步
...{
class Class1
...{
[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();
[STAThread]
static void Main(string[] args)
...{
int i=0;
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
while(true)...{
System.Console.WriteLine("main_"+i++);
Thread.Sleep(100);
}
}
public static void endWrite(IAsyncResult ir)
...{
Thread.Sleep(100);
((FileStream)ir.AsyncState).Close();
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
System.Console.WriteLine("endwrite_"+GetCurrentThreadId());
}
}
}
输出结果:
main_0
main_1
endwrite_2264
main_2
endwrite_2264
main_3
endwrite_2264
main_4
endwrite_2264
main_5
endwrite_2356
main_6
endwrite_2356
main_7
endwrite_2356
main_8
endwrite_2356
main_9
endwrite_2264
endwrite_2356
endwrite_2264
main_1
endwrite_2264
main_2
endwrite_2264
main_3
endwrite_2264
main_4
endwrite_2264
main_5
endwrite_2356
main_6
endwrite_2356
main_7
endwrite_2356
main_8
endwrite_2356
main_9
endwrite_2264
endwrite_2356
endwrite_2264
可以看到产生线程的ID多是相同的,是使用了同一个线程还是线程结束后,新线程ID号相同?再次测试。
using System;
using System.IO;
using System.Threading;
using System.Runtime.InteropServices;
namespace test_异步
...{
class Class1
...{
[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();
[STAThread]
static void Main(string[] args)
...{
int i=0;
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
while(i<100)...{
System.Console.WriteLine("main_"+i++);
Thread.Sleep(100);
}
}
public static void endWrite(IAsyncResult ir)
...{
((FileStream)ir.AsyncState).Close();
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
System.Console.WriteLine("endwrite_"+GetCurrentThreadId());
Thread.Sleep(100);
}
}
}
using System.IO;
using System.Threading;
using System.Runtime.InteropServices;
namespace test_异步
...{
class Class1
...{
[DllImport("kernel32.dll")]
public static extern int GetCurrentThreadId();
[STAThread]
static void Main(string[] args)
...{
int i=0;
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
while(i<100)...{
System.Console.WriteLine("main_"+i++);
Thread.Sleep(100);
}
}
public static void endWrite(IAsyncResult ir)
...{
((FileStream)ir.AsyncState).Close();
FileStream fs=new FileStream(@"c:kk.txt",FileMode.Create,FileAccess.Write,FileShare.Write);
fs.BeginWrite(new byte[]...{1},0,1,new AsyncCallback(endWrite),fs);
System.Console.WriteLine("endwrite_"+GetCurrentThreadId());
Thread.Sleep(100);
}
}
}
main_98
endwrite_2204
endwrite_3884
endwrite_2280
endwrite_2216
endwrite_1632
endwrite_740
endwrite_3760
endwrite_4016
endwrite_1220
endwrite_1784
endwrite_4088
endwrite_3964
endwrite_2160
endwrite_2360
endwrite_2352
endwrite_912
endwrite_2376
endwrite_4048
endwrite_2364
endwrite_4076
endwrite_4008
endwrite_992
main_99
endwrite_2204
endwrite_3884
endwrite_2280
endwrite_2216
endwrite_1632
endwrite_740
endwrite_3760
endwrite_4016
endwrite_1220
endwrite_1784
endwrite_4088
endwrite_3964
endwrite_2160
endwrite_2360
endwrite_2352
endwrite_912
endwrite_2376
endwrite_4048
endwrite_2364
endwrite_4076
endwrite_4008
endwrite_992
endwrite_2204
endwrite_3884
endwrite_2280
endwrite_2216
endwrite_1632
endwrite_740
endwrite_3760
endwrite_4016
endwrite_1220
endwrite_1784
endwrite_4088
endwrite_3964
endwrite_2160
endwrite_2360
endwrite_2352
endwrite_912
endwrite_2376
endwrite_4048
endwrite_2364
endwrite_4076
endwrite_4008
endwrite_992
main_99
endwrite_2204
endwrite_3884
endwrite_2280
endwrite_2216
endwrite_1632
endwrite_740
endwrite_3760
endwrite_4016
endwrite_1220
endwrite_1784
endwrite_4088
endwrite_3964
endwrite_2160
endwrite_2360
endwrite_2352
endwrite_912
endwrite_2376
endwrite_4048
endwrite_2364
endwrite_4076
endwrite_4008
endwrite_992
结论:异步和多线程没有区别,有可能是经过优化后的多线程
===================================
http://blog.csdn.net/xiyou/archive/2006/09/19/1245614.aspx
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