操作系统大作业.docx

操作系统大作业学号：091401223 姓名：高玉林本次上机作业使用的软件是Microsoft Visual Studio Community 2017 RC，版本 15.0.26020.0，使用的语言是C#。第一题：编写求f(x)值的程序f(x)=f1(x)+f2(x)+f3(x)f1(x)=10*xf2(x)=100*xf3(x)=f1(x)*f2(x)要求给出f(x)、f1(x)、f2(x)、f3(x)四个并发函数并完成计算。思路：应用Mutex类、AutoResetEvent类、Waithandle类，主函数中创建四个线程，使用两个Mutex变量控制函数的执行顺序：f3()函数应在f1()和f2()之后运行，f()函数应在f3()之后运行。代码：using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Threading;namespace homework6 class function static Mutex m1; static Mutex m2; double x; double f1_result; double f2_result; double f3_result; double final_result; static AutoResetEvent event1 = new AutoResetEvent(false); static AutoResetEvent event2 = new AutoResetEvent(false); static AutoResetEvent event3 = new AutoResetEvent(false); static AutoResetEvent event4 = new AutoResetEvent(false); function(double x) this.x = x; static void Main(string args) Console.WriteLine(输入一个数); double x = double.Parse(Console.ReadLine(); function function = new function(x); m1 = new Mutex(true); m2 = new Mutex(true); AutoResetEvent a = new AutoResetEvent4; a0 = event1; a1 = event2; a2 = event3; a3 = event4; Thread p = new Thread(new ThreadStart(function.f); Thread p1 = new Thread(new ThreadStart(function.f1); Thread p2 = new Thread(new ThreadStart(function.f2); Thread p3 = new Thread(new ThreadStart(function.f3); p.Start(); p3.Start(); p1.Start(); p2.Start(); Thread.Sleep(1000); m1.ReleaseMutex(); Thread.Sleep(1000); m2.ReleaseMutex(); WaitHandle.WaitAll(a); Console.ReadLine(); public void f1() Console.WriteLine(function f1() start.); f1_result = 10 * x; Console.WriteLine(f1()的结果是： + f1_result); Console.WriteLine(function f1() is finished.); event1.Set(); Console.WriteLine(); public void f2() Console.WriteLine(function f2() start.); f2_result = 100 * x; Console.WriteLine(f2()的结果是： + f2_result); Console.WriteLine(function f2() is finished.); event2.Set(); Console.WriteLine(); public void f3() Console.WriteLine(function f3() start.); m1.WaitOne(); f3_result = f2_result * f1_result; Console.WriteLine(f3()的结果是： + f3_result); Console.WriteLine(function f3() is finished.); event3.Set(); m1.ReleaseMutex(); Console.WriteLine(); public void f() Console.WriteLine(function F() start.); Mutex a = new Mutex2; a0 = m1; a1 = m2; Mutex.WaitAll(a); final_result = f1_result * f2_result * f3_result; Console.WriteLine(F()的结果是： + final_result); Console.WriteLine(function F() is finished。); event4.Set(); Console.WriteLine(); 运行结果：第二题：设程序中有一整形公共变量x，有一写线程向x连续写入1,2,10（用循环）。有读线程将写入变量x的值依次读出（用循环），试完成程序。思路：使用lock关键字、Monito类，构造两个void函数，分别对公共变量进行读与写，在主函数中创建读线程与写线程，交替执行。代码：using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Threading;namespace homework3 class ProducerAndConsumer int x; Boolean readFlag = false;/true表示可以读取 false表示不可以读取可以写入 int getX() return x; void setX(int x) this.x = x; void write(int x) lock (this) if (readFlag) try Monitor.Wait(this); catch(Exception e) Console.Write(e); setX(x); Console.WriteLine(Producer: + this.x); readFlag = true; Monitor.Pulse(this); void threadProduce() for(int i = 1; i = 10; i+) write(i); void read() lock (this) if (!readFlag) try Monitor.Wait(this); catch(Exception e) Console.Write(e); int temp =getX(); readFlag = false; Console.WriteLine(Consumer:0, temp); Monitor.Pulse(this); void threadConsumer() for(int i = 1; i = 10; i+) read(); static void Main(string args) ProducerAndConsumer pc = new ProducerAndConsumer(); Thread producer = new Thread(new Thread