в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:20:14Z

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==Reader Lock==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime;
using System.Runtime.rupilerServices;
using System.Security;
using System.Text;
using System.Threading;
public class MainClass
{

public static void Main()
{
ReaderWriterLock rwLock = new ReaderWriterLock();
rwLock.AcquireReaderLock(250);
if (!rwLock.IsReaderLockHeld)
return;
Console.WriteLine("Reader lock held");

LockCookie cookie = rwLock.UpgradeToWriterLock(250);
if (rwLock.IsWriterLockHeld)
{
Console.WriteLine("Upgraded to writer lock");
rwLock.DowngradeFromWriterLock(ref cookie);
}
rwLock.ReleaseReaderLock();
}
}</source>
<pre class=codeResult>Reader lock held
Upgraded to writer lock</pre>

==Using a reader-writer lock to protect a complex business type==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime;
using System.Runtime.rupilerServices;
using System.Security;
using System.Text;
using System.Threading;
class Account
{
public string company ="No Name";
public decimal balance= 0.0m;
public DateTime lastUpdate = DateTime.Now;
public ReaderWriterLock syncLock = new ReaderWriterLock();
public decimal AutoUpdateBalance(decimal delta)
{
syncLock.AcquireWriterLock(-1);
try
{
balance += delta;
lastUpdate = DateTime.Now;
return balance;
}
finally
{
syncLock.ReleaseWriterLock();
}
}
public void GetState(out string company, out decimal balance, out DateTime lastUpdate)
{
syncLock.AcquireReaderLock(-1);
try
{
company = this.rupany;
balance = this.balance;
lastUpdate = this.lastUpdate;
}
finally
{
syncLock.ReleaseReaderLock();
}
}
}

public class MainClass
{

public static void Main()
{
Account account = new Account();
string company;
decimal balance;
DateTime lastUpdate;
account.GetState(out company, out balance, out lastUpdate);
Console.WriteLine("{0}, balance: {1}, last updated: {2}",company, balance, lastUpdate);
}
}</source>
<pre class=codeResult>No Name, balance: 0.0, last updated: 25/03/2007 3:04:25 PM</pre>

==Writer Lock==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime;
using System.Runtime.rupilerServices;
using System.Security;
using System.Text;
using System.Threading;
public class MainClass
{

public static void Main()
{
ReaderWriterLock rwLock = new ReaderWriterLock();
rwLock.AcquireWriterLock(250);
if (rwLock.IsWriterLockHeld)
{
Console.WriteLine("Writer lock held");
rwLock.ReleaseWriterLock();
}
rwLock.ReleaseWriterLock();
}
}</source>
<pre class=codeResult>Writer lock held
Unhandled Exception: System.ApplicationException: Attempt to release mutex not owned by caller. (Exc
eption from HRESULT: 0x00000120)
at System.Threading.ReaderWriterLock.ReleaseWriterLockInternal()
at MainClass.Main()</pre>

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в 15:31, 26 мая 2010

Admin: 1 версия