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CSharp_顾朗哲_无21 #19

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26 changes: 26 additions & 0 deletions hw1/.vscode/launch.json
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
{
"version": "0.2.0",
"configurations": [
{
// Use IntelliSense to find out which attributes exist for C# debugging
// Use hover for the description of the existing attributes
// For further information visit https://github.com/dotnet/vscode-csharp/blob/main/debugger-launchjson.md
"name": ".NET Core Launch (console)",
"type": "coreclr",
"request": "launch",
"preLaunchTask": "build",
// If you have changed target frameworks, make sure to update the program path.
"program": "${workspaceFolder}/hw1/bin/Debug/net6.0/hw1.dll",
"args": [],
"cwd": "${workspaceFolder}/hw1",
// For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
"console": "internalConsole",
"stopAtEntry": false
},
{
"name": ".NET Core Attach",
"type": "coreclr",
"request": "attach"
}
]
}
41 changes: 41 additions & 0 deletions hw1/.vscode/tasks.json
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Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,41 @@
{
"version": "2.0.0",
"tasks": [
{
"label": "build",
"command": "dotnet",
"type": "process",
"args": [
"build",
"${workspaceFolder}/hw1/hw1.csproj",
"/property:GenerateFullPaths=true",
"/consoleloggerparameters:NoSummary"
],
"problemMatcher": "$msCompile"
},
{
"label": "publish",
"command": "dotnet",
"type": "process",
"args": [
"publish",
"${workspaceFolder}/hw1/hw1.csproj",
"/property:GenerateFullPaths=true",
"/consoleloggerparameters:NoSummary"
],
"problemMatcher": "$msCompile"
},
{
"label": "watch",
"command": "dotnet",
"type": "process",
"args": [
"watch",
"run",
"--project",
"${workspaceFolder}/hw1/hw1.csproj"
],
"problemMatcher": "$msCompile"
}
]
}
225 changes: 138 additions & 87 deletions hw1/hw1/Program.cs
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Original file line number Diff line number Diff line change
@@ -1,88 +1,139 @@
using System;
using System.Diagnostics;

namespace Homework
{
public class Program
{
public static void Main(string[] args)
{
ILongProgressByTime a = new LongProgressByTime();
new Thread
(
() =>
{
Console.WriteLine("A Start: "+(a.Start(2000)).ToString());
Thread.Sleep(1000);
Console.WriteLine("A TrySet0: "+(a.TrySet0()).ToString());
Thread.Sleep(500);
Console.WriteLine("A Start: "+(a.Start(1000)).ToString() +" Now: "+Environment.TickCount64);
Thread.Sleep(500);
Console.WriteLine("A Progress: "+(a.GetProgress()).ToString() +" Now: "+Environment.TickCount64);
Thread.Sleep(1003);
Console.WriteLine("A TrySet0: "+(a.TrySet0()).ToString());
}
).Start();

new Thread
(
() =>
{
Console.WriteLine("B Start: "+(a.Start(2000)).ToString());
Thread.Sleep(1500);
Console.WriteLine("B Start: " +(a.Start(1000)).ToString() + " Now: " + Environment.TickCount64);
Thread.Sleep(500);
Console.WriteLine("B Progress: " +(a.GetProgress()).ToString() + " Now: " + Environment.TickCount64);
}
).Start();
}
}

public interface ILongProgressByTime
{
/// <summary>
/// 尝试加载下一次进度条，needTime指再次加载进度条所需时间，单位毫秒
/// 如果之前进度条处于就绪态，则将进度开始下一次加载，返回true
/// 如果之前进度条不处于就绪态，返回false
/// </summary>
public bool Start(long needTime);

/// <summary>
/// 使未完成的进度条清零并终止变为就绪态，返回值代表是否成功终止
/// </summary>
public bool TrySet0();

/// <summary>
/// 使进度条强制清零并终止变为就绪态
/// </summary>
public void Set0();

/// <summary>
/// ElapsedTime指其中已过去的时间，NeedTime指当前Progress完成所需时间，单位毫秒
/// </summary>
public (long ElapsedTime, long NeedTime) GetProgress();
}

public class LongProgressByTime: ILongProgressByTime
{
// 根据时间推算Start后完成多少进度的进度条（long）。

// 只允许修改LongProgressByTime类中的代码
// 要求实现ILongProgressByTime中的要求
// 可利用Environment.TickCount64获取当前时间（单位ms）

//挑战：利用原子操作
//long.MaxValue非常久
}

/*输出示例（仅供参考）：
* A Start: False
B Start: True
A TrySet0: True
B Start: True Now: 14536562
A Start: False Now: 14536578
B Progress: (516, 1000) Now: 14537078
A Progress: (516, 1000) Now: 14537078
A TrySet0: False
*/
using System;
using System.Diagnostics;

namespace Homework
{
public class Program
{
public static void Main(string[] args)
{
ILongProgressByTime a = new LongProgressByTime();
new Thread
(
() =>
{
Console.WriteLine("A Start: "+(a.Start(2000)).ToString());
Thread.Sleep(1000);
Console.WriteLine("A TrySet0: "+(a.TrySet0()).ToString());
Thread.Sleep(500);
Console.WriteLine("A Start: "+(a.Start(1000)).ToString() +" Now: "+Environment.TickCount64);
Thread.Sleep(500);
Console.WriteLine("A Progress: "+(a.GetProgress()).ToString() +" Now: "+Environment.TickCount64);
Thread.Sleep(1003);
Console.WriteLine("A TrySet0: "+(a.TrySet0()).ToString());
}
).Start();

new Thread
(
() =>
{
Console.WriteLine("B Start: "+(a.Start(2000)).ToString());
Thread.Sleep(1500);
Console.WriteLine("B Start: " +(a.Start(1000)).ToString() + " Now: " + Environment.TickCount64);
Thread.Sleep(500);
Console.WriteLine("B Progress: " +(a.GetProgress()).ToString() + " Now: " + Environment.TickCount64);
}
).Start();
}
}

public interface ILongProgressByTime
{
/// <summary>
/// 尝试加载下一次进度条，needTime指再次加载进度条所需时间，单位毫秒
/// 如果之前进度条处于就绪态，则将进度开始下一次加载，返回true
/// 如果之前进度条不处于就绪态，返回false
/// </summary>
public bool Start(long needTime);

/// <summary>
/// 使未完成的进度条清零并终止变为就绪态，返回值代表是否成功终止
/// </summary>
public bool TrySet0();

/// <summary>
/// 使进度条强制清零并终止变为就绪态
/// </summary>
public void Set0();

/// <summary>
/// ElapsedTime指其中已过去的时间，NeedTime指当前Progress完成所需时间，单位毫秒
/// </summary>
public (long ElapsedTime, long NeedTime) GetProgress();
}

public class LongProgressByTime: ILongProgressByTime
{
// 根据时间推算Start后完成多少进度的进度条（long）。

// 只允许修改LongProgressByTime类中的代码
// 要求实现ILongProgressByTime中的要求
// 可利用Environment.TickCount64获取当前时间（单位ms）

long startTime;
long requiredTime;
long finishedTime;
bool isAtReady = true;

public bool Start(long needTime) {
object lockobject = new object();
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锁应当作为字段，否则每次调用方法都是对一个全新的锁进行占用，这毫无意义

lock (lockobject) {
if (isAtReady) {
isAtReady = false;
requiredTime = needTime;
startTime = Environment.TickCount64;
finishedTime = 0;
return true;
}
else {
return false;
}
}
}

public bool TrySet0() {
object lockobject = new object();
lock (lockobject) {
if (!isAtReady) {
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应当“使未完成的进度条清零”

isAtReady = true;
finishedTime = 0;
return true;
}
else {
return false;
}
}
}

public void Set0() {
object lockobject = new object();
lock (lockobject) {
finishedTime = 0;
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finishedTime 的意义是？
isAtReady 应当更新

}
}

public (long ElapsedTime, long NeedTime) GetProgress() {
object lockobject = new object();
lock (lockobject) {
long nowTime = Environment.TickCount64;
finishedTime = nowTime - startTime;
return (finishedTime, requiredTime);
}
}

//挑战：利用原子操作
//long.MaxValue非常久
}

/*输出示例（仅供参考）：
* A Start: False
B Start: True
A TrySet0: True
B Start: True Now: 14536562
A Start: False Now: 14536578
B Progress: (516, 1000) Now: 14537078
A Progress: (516, 1000) Now: 14537078
A TrySet0: False
*/
}
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