看一下以下兩個例子的執行結果：//testthread.cs
using system;
using system.threading;
public
class test
thread.join();
console.writeline ("final count: ", count);
}
static
void threadjob()
}
}
//innerdatathread.cs
using system;using system.threading;
public
class test
", tmp);
thread.sleep(50);
tmp++;
console.writeline ("incremented tmp to ", tmp);
thread.sleep(20);
count = tmp;
console.writeline ("written count=", tmp);
thread.sleep(30);
}
thread.join();
console.writeline ("final count: ", count);
}
static
void threadjob()
", tmp);
thread.sleep(20);
tmp++;
console.writeline ("/t/t/t/tincremented tmp to ", tmp);
thread.sleep(10);
count = tmp;
console.writeline ("/t/t/t/twritten count=", tmp);
thread.sleep(40);
}
}
}
read count=0read count=0
incremented tmp to 1
written count=1
incremented tmp to 1
written count=1
read count=1
incremented tmp to 2
read count=1
written count=2
read count=2
incremented tmp to 2
incremented tmp to 3
written count=2
written count=3
read count=3
read count=3
incremented tmp to 4
incremented tmp to 4
written count=4
written count=4
read count=4
read count=4
incremented tmp to 5
written count=5
incremented tmp to 5
written count=5
read count=5
incremented tmp to 6
written count=6
final count: 6
再比較下面這個例子：
//使用monitor.enter/exit
//monitorthread.cs
using system;
using system.threading;
public
class test
", tmp);
thread.sleep(50);
tmp++;
console.writeline ("incremented tmp to ", tmp);
thread.sleep(20);
count = tmp;
console.writeline ("written count=", tmp);
monitor.exit(countlock);
thread.sleep(30);
}thread.join();
console.writeline ("final count: ", count);
}static
void threadjob()
", tmp);
thread.sleep(20);
tmp++;
console.writeline ("/t/t/t/tincremented tmp to ", tmp);
thread.sleep(10);
count = tmp;
console.writeline ("/t/t/t/twritten count=", tmp);
monitor.exit(countlock);
thread.sleep(40);}}
}結果與上例innerdatathread.cs是不一樣的，原因就在於monitor的使用了。
read count=0incremented tmp to 1
written count=1
read count=1
incremented tmp to 2
written count=2
read count=2
incremented tmp to 3
written count=3
read count=3
incremented tmp to 4
written count=4
read count=4
incremented tmp to 5
written count=5
read count=5
incremented tmp to 6
written count=6
read count=6
incremented tmp to 7
written count=7
read count=7
incremented tmp to 8
written count=8
read count=8
incremented tmp to 9
written count=9
read count=9
incremented tmp to 10
written count=10
final count: 10
下面使用lock來鎖定執行緒：
// lockthread.cs
using system;
using system.threading;
public
class test
", tmp);
thread.sleep(50);
tmp++;
console.writeline ("incremented tmp to ", tmp);
thread.sleep(20);
count = tmp;
console.writeline ("written count=", tmp);
}thread.sleep(30);
}thread.join();
console.writeline ("final count: ", count);
}static
void threadjob()
", tmp);
thread.sleep(20);
tmp++;
console.writeline ("/t/t/t/tincremented tmp to ", tmp);
if (count < 100)
throw
new exception();
thread.sleep(10);
count = tmp;
console.writeline ("/t/t/t/twritten count=", tmp);
}thread.sleep(40);}}
}結果如何？與monitorthread.cs比較一下，再想想看。
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