有趣的多线程编程（3）——线程内部是如何进行的？
有趣的多线程编程（3）——线程内部是如何进行的？ //TestThread.cs
using System;, count); }
//InnerDataThread.cs
, tmp); Thread.Sleep(50); tmp++; Console.WriteLine (, tmp); Thread.Sleep(20); count = tmp; Console.WriteLine (, tmp); Thread.Sleep(30); } thread.Join(); Console.WriteLine (, count); } , tmp); Thread.Sleep(20); tmp++; Console.WriteLine (, tmp); Thread.Sleep(10); count = tmp; Console.WriteLine (, tmp); Thread.Sleep(40); } }}Read count=0 Read count=0 Incremented tmp to 1 Written count=1Incremented tmp to 1Written count=1 Read count=1 Incremented tmp to 2Read count=1 Written count=2 Read count=2Incremented tmp to 2 Incremented tmp to 3Written count=2 Written count=3Read count=3 Read count=3Incremented tmp to 4 Incremented tmp to 4 Written count=4Written count=4 Read count=4Read count=4 Incremented tmp to 5 Written count=5Incremented tmp to 5Written count=5Read count=5Incremented tmp to 6Written count=6Final count: 6
再比较下面这个例子：
//使用Monitor.Enter/Exit
//MonitorThread.cs
{
{
ThreadStart job =
Thread thread =
thread.Start();
{
Monitor.Enter(countLock);
Console.WriteLine (, tmp);
Thread.Sleep(50);
tmp++;
Console.WriteLine (, tmp);
Thread.Sleep(20);
count = tmp;
Console.WriteLine (, tmp);
Monitor.Exit(countLock);
Thread.Sleep(30);
}
thread.Join();
Console.WriteLine (, count);
}
{
{
Monitor.Enter(countLock);
Console.WriteLine (, tmp);
Thread.Sleep(20);
tmp++;
Console.WriteLine (, tmp);
Thread.Sleep(10);
count = tmp;
Console.WriteLine (, tmp);
Monitor.Exit(countLock);
Thread.Sleep(40);
}
}
}
结果与上例InnerDataThread.cs是不一样的，原因就在于Monitor的使用了。
Read count=0Incremented tmp to 1Written count=1 Read count=1 Incremented tmp to 2 Written count=2Read count=2Incremented tmp to 3Written count=3 Read count=3 Incremented tmp to 4 Written count=4Read count=4Incremented tmp to 5Written count=5 Read count=5 Incremented tmp to 6 Written count=6Read count=6Incremented tmp to 7Written count=7 Read count=7 Incremented tmp to 8 Written count=8Read count=8Incremented tmp to 9Written count=9 Read count=9 Incremented tmp to 10 Written count=10Final count: 10
下面使用lock来锁定线程：
// LockThread.cs
{
{
ThreadStart job =
Thread thread =
thread.Start();
{
{
Console.WriteLine (, tmp);
Thread.Sleep(50);
tmp++;
Console.WriteLine (, tmp);
Thread.Sleep(20);
count = tmp;
Console.WriteLine (, tmp);
}
Thread.Sleep(30);
}
thread.Join();
Console.WriteLine (, count);
}
{
{
{
Console.WriteLine (, tmp);
Thread.Sleep(20);
tmp++;
Console.WriteLine (, tmp);
Thread.Sleep(10);
count = tmp;
Console.WriteLine (, tmp);
}
Thread.Sleep(40);
}
}
}
结果如何？与MonitorThread.cs比较一下，再想想看。
