/// <summary>
/// Acquires read lock for the specified object.
/// </summary>
/// <typeparam name="T">The type of the object to be locked.</typeparam>
/// <param name="obj">The object to be locked.</param>
/// <param name="timeout">The amount of time to wait for the lock.</param>
/// <returns>The acquired read lock.</returns>
/// <exception cref="TimeoutException">The lock cannot be acquired during the specified amount of time.</exception>
public static Lock.Holder AcquireReadLock <T>(this T obj, TimeSpan timeout)
where T : class => Lock.ReadLock(obj.GetReaderWriterLock(), false).Acquire(timeout);
/// <summary>
/// Acquires upgradeable read lock for the specified object.
/// </summary>
/// <typeparam name="T">The type of the object to be locked.</typeparam>
/// <param name="obj">The object to be locked.</param>
/// <returns>The acquired upgradeable read lock.</returns>
public static Lock.Holder AcquireUpgradeableReadLock <T>(this T obj)
where T : class => Lock.ReadLock(obj.GetReaderWriterLock(), true).Acquire();
/// <summary>
/// Acquires read lock for the specified object.
/// </summary>
/// <typeparam name="T">The type of the object to be locked.</typeparam>
/// <param name="obj">The object to be locked.</param>
/// <returns>The acquired read lock.</returns>
public static Lock.Holder AcquireReadLock <T>(this T obj)
where T : class
=>
Lock.ReadLock(obj.GetReaderWriterLock(), false).Acquire();