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using System;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using Pfz.Threading;
using Pfz.Threading.Disposers;
namespace Pfz.Extensions
{
/// <summary>
/// Adds methods to use ReaderWriterLockSlim easily,
/// always with time-outs to avoid dead-locks.
/// See PfzLockConfiguration class if you want to log dead-locks.
/// </summary>
public static class PfzReaderWriterLockExtensions
{
#region IDisposable locks
#region ReadLock
/// <summary>
/// Abort-unsafe version of read-lock.
/// Must be disposed to release the lock.
/// </summary>
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
public static ReadLockDisposer ReadLock(this ReaderWriterLockSlim readerWriterLock)
{
if (readerWriterLock == null)
throw new ArgumentNullException("readerWriterLock");
ReadLockDisposer result = new ReadLockDisposer(readerWriterLock, Timeout.Infinite);
return result;
}
/// <summary>
/// Tries to acquire a read-lock on the given object using the default timeout.
/// If it fails, returns null.
/// </summary>
/// <param name="readerWriterLock">The object to lock.</param>
/// <returns>A disposable object to release the lock, or null.</returns>
public static ReadLockDisposer TryReadLock(this ReaderWriterLockSlim readerWriterLock)
{
return TryReadLock(readerWriterLock, LockConfiguration.DefaultLockTimeout);
}
/// <summary>
/// Tries to acquire a read-lock on the given object using the specified timeout.
/// If it fails, returns null.
/// </summary>
/// <param name="readerWriterLock">The object to lock.</param>
/// <param name="timeoutInMilliseconds">The timeout to try for the lock.</param>
/// <returns>A disposable object to release the lock, or null.</returns>
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
public static ReadLockDisposer TryReadLock(this ReaderWriterLockSlim readerWriterLock, int timeoutInMilliseconds)
{
if (readerWriterLock == null)
throw new ArgumentNullException("readerWriterLock");
ReadLockDisposer result = new ReadLockDisposer(readerWriterLock, timeoutInMilliseconds);
if (result._readerWriterLock != null)
return result;
return null;
}
#endregion
#region UpgradeableLock
/// <summary>
/// Abort-unsafe version of upgradeable-lock.
/// Must be disposed to release the lock.
/// </summary>
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
public static UpgradeableLockDisposer UpgradeableLock(this ReaderWriterLockSlim readerWriterLock)
{
if (readerWriterLock == null)
throw new ArgumentNullException("readerWriterLock");
UpgradeableLockDisposer result = new UpgradeableLockDisposer(readerWriterLock, -1);
return result;
}
/// <summary>
/// Tries to acquire an upgradeable lock on the given object, using the default timeout.
/// If it fails, returns null.
/// </summary>
/// <param name="readerWriterLock">The object to try to lock.</param>
/// <returns>An disposable object to release the lock, or null if the locks fails.</returns>
public static UpgradeableLockDisposer TryUpgradeableLock(this ReaderWriterLockSlim readerWriterLock)
{
return TryUpgradeableLock(readerWriterLock, LockConfiguration.DefaultLockTimeout);
}
/// <summary>
/// Tries to acquire an upgradeable lock on the given object, using the specified timeout.
/// If it fails, returns null.
/// </summary>
/// <param name="readerWriterLock">The object to try to lock.</param>
/// <param name="timeoutInMilliseconds">The maximum time to wait for the lock.</param>
/// <returns>An disposable object to release the lock, or null if the locks fails.</returns>
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
public static UpgradeableLockDisposer TryUpgradeableLock(this ReaderWriterLockSlim readerWriterLock, int timeoutInMilliseconds)
{
if (readerWriterLock == null)
throw new ArgumentNullException("readerWriterLock");
UpgradeableLockDisposer result = new UpgradeableLockDisposer(readerWriterLock, timeoutInMilliseconds);
if (result._readerWriterLock != null)
return result;
return null;
}
#endregion
#region WriteLock
/// <summary>
/// Abort-unsafe version of write-lock.
/// Must be disposed to release the lock.
/// </summary>
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
public static WriteLockDisposer WriteLock(this ReaderWriterLockSlim readerWriterLock)
{
if (readerWriterLock == null)
throw new ArgumentNullException("readerWriterLock");
WriteLockDisposer result = new WriteLockDisposer(readerWriterLock, -1);
return result;
}
/// <summary>
/// Tries to acquire a write-lock on the given object using the default timeout.
/// If it fails, returns null.
/// </summary>
/// <param name="readerWriterLock">The object to lock.</param>
/// <returns>A disposable object to release the lock, or null.</returns>
public static WriteLockDisposer TryWriteLock(this ReaderWriterLockSlim readerWriterLock)
{
return TryWriteLock(readerWriterLock, LockConfiguration.DefaultLockTimeout);
}
/// <summary>
/// Tries to acquire a write-lock on the given object using the specified timeout.
/// If it fails, returns null.
/// </summary>
/// <param name="readerWriterLock">The object to lock.</param>
/// <param name="timeoutInMilliseconds">The maximum time to wait for the lock.</param>
/// <returns>A disposable object to release the lock, or null.</returns>
[SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]
public static WriteLockDisposer TryWriteLock(this ReaderWriterLockSlim readerWriterLock, int timeoutInMilliseconds)
{
if (readerWriterLock == null)
throw new ArgumentNullException("readerWriterLock");
WriteLockDisposer result = new WriteLockDisposer(readerWriterLock, timeoutInMilliseconds);
if (result._readerWriterLock != null)
return result;
return null;
}
#endregion
#endregion
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).