// -----------------------------------
// Private helpers
private void InitializeDefaultSource()
{
// Lazy is slower, and although multiple threads may try and set m_source repeatedly, the race is benign.
// Alternative: LazyInititalizer.EnsureInitialized(ref m_source, ()=>CancellationTokenSource.InternalGetStaticSource(false));
m_source = CancellationTokenSource.InternalGetStaticSource(false);
}
/// <summary>
/// Initializes the <see cref="T:System.Threading.CancellationToken">CancellationToken</see>.
/// </summary>
/// <param name="canceled">
/// The canceled state for the token.
/// </param>
/// <remarks>
/// Tokens created with this constructor will remain in the canceled state specified
/// by the <paramref name="canceled"/> parameter. If <paramref name="canceled"/> is false,
/// both <see cref="CanBeCanceled"/> and <see cref="IsCancellationRequested"/> will be false.
/// If <paramref name="canceled"/> is true,
/// both <see cref="CanBeCanceled"/> and <see cref="IsCancellationRequested"/> will be true.
/// </remarks>
public CancellationToken(bool canceled) :
this()
{
if (canceled)
{
m_source = CancellationTokenSource.InternalGetStaticSource(canceled);
}
}
public CancellationToken(bool canceled)
{
this = default(CancellationToken);
if (canceled)
{
this.m_source = CancellationTokenSource.InternalGetStaticSource(canceled);
}
}
public override int GetHashCode()
{
if (this.m_source == null)
{
return(CancellationTokenSource.InternalGetStaticSource(false).GetHashCode());
}
return(this.m_source.GetHashCode());
}
public CancellationToken(bool canceled)
{
this = new CancellationToken();
if (!canceled)
{
return;
}
this.m_source = CancellationTokenSource.InternalGetStaticSource(canceled);
}
/// <summary>
/// Serves as a hash function for a <see cref="T:System.Threading.CancellationToken">CancellationToken</see>.
/// </summary>
/// <returns>A hash code for the current <see cref="T:System.Threading.CancellationToken">CancellationToken</see> instance.</returns>
public override Int32 GetHashCode()
{
if (m_source == null)
{
// link to the common source so that we have a source to interrogate.
return(CancellationTokenSource.InternalGetStaticSource(false).GetHashCode());
}
return(m_source.GetHashCode());
}
public bool Equals(CancellationToken other)
{
if (this.m_source == null && other.m_source == null)
{
return(true);
}
if (this.m_source == null)
{
return(other.m_source == CancellationTokenSource.InternalGetStaticSource(false));
}
if (other.m_source == null)
{
return(this.m_source == CancellationTokenSource.InternalGetStaticSource(false));
}
return(this.m_source == other.m_source);
}
/// <summary>
/// Determines whether the current <see cref="T:System.Threading.CancellationToken">CancellationToken</see> instance is equal to the
/// specified token.
/// </summary>
/// <param name="other">The other <see cref="T:System.Threading.CancellationToken">CancellationToken</see> to which to compare this
/// instance.</param>
/// <returns>True if the instances are equal; otherwise, false. Two tokens are equal if they are associated
/// with the same <see cref="T:System.Threading.CancellationTokenSource">CancellationTokenSource</see> or if they were both constructed
/// from public CancellationToken constructors and their <see cref="IsCancellationRequested"/> values are equal.</returns>
public bool Equals(CancellationToken other)
{
//if both sources are null, then both tokens represent the Empty token.
if (m_source == null && other.m_source == null)
{
return(true);
}
// one is null but other has inflated the default source
// these are only equal if the inflated one is the staticSource(false)
if (m_source == null)
{
return(other.m_source == CancellationTokenSource.InternalGetStaticSource(false));
}
if (other.m_source == null)
{
return(m_source == CancellationTokenSource.InternalGetStaticSource(false));
}
// general case, we check if the sources are identical
return(m_source == other.m_source);
}
private void InitializeDefaultSource()
{
this.m_source = CancellationTokenSource.InternalGetStaticSource(false);
}
