/// <summary>
/// Executes a parallel For loop.
/// </summary>
/// <param name="start">Loop start index.</param>
/// <param name="stop">Loop stop index.</param>
/// <param name="loopBody">Loop body.</param>
/// <remarks>The method is used to parallelise for loop by running iterations across
/// several threads.
/// Example usage:
/// <code>
/// for ( int i = 0; i < 10; i++ )
/// {
/// System.Diagnostics.Debug.WriteLine( "i = " + i );
/// }
/// </code>
/// can be replaced by:
/// <code>
/// Parallel.For( 0, 10, delegate( int i )
/// {
/// System.Diagnostics.Debug.WriteLine( "i = " + i );
/// } );
/// </code>
/// If <c>Parallel.ThreadCount</c> is exactly <c>1</c>, no threads are spawned.
/// </remarks>
public static void For(int start, int stop, ParallelFor.ForLoopDelegate loopBody)
{
if (Parallel.threadCount == 1)
{
for (int i = start; i < stop; i++)
{
loopBody(i);
}
}
else
{
lock (lockObject) {
ParallelFor parallel = ParallelFor.GetInstance(threadCount);
parallel.DoFor(start, stop, loopBody);
}
}
}
/// <summary>
/// Executes a parallel For loop.
/// </summary>
/// <param name="start">Loop start index.</param>
/// <param name="stop">Loop stop index.</param>
/// <param name="loopBody">Loop body.</param>
/// <param name="cancellationToken">Used to signal if the user wishes to cancel the loop before it completes.</param>
/// <remarks>The method is used to parallelise for loop by running iterations across
/// several threads.
/// Example usage:
/// <code>
/// for ( int i = 0; i < 10; i++ )
/// {
/// System.Diagnostics.Debug.WriteLine( "i = " + i );
/// }
/// </code>
/// can be replaced by:
/// <code>
/// Parallel.For( 0, 10, delegate( int i )
/// {
/// System.Diagnostics.Debug.WriteLine( "i = " + i );
/// } );
/// </code>
/// If <c>Parallel.ThreadCount</c> is exactly <c>1</c>, no threads are spawned.
/// </remarks>
public static void For(int start, int stop, [NotNull, InstantHandle] Action <int> loopBody, CancellationToken cancellationToken = default(CancellationToken))
{
if (loopBody == null)
{
throw new ArgumentNullException("loopBody");
}
if (Parallel.threadCount == 1)
{
for (int i = start; i < stop; i++)
{
loopBody(i);
cancellationToken.ThrowIfCancellationRequested();
}
}
else
{
lock (lockObject)
{
ParallelFor parallel = ParallelFor.GetInstance(threadCount);
parallel.DoFor(start, stop, loopBody, cancellationToken);
cancellationToken.ThrowIfCancellationRequested();
}
}
}
