Question

I have 100 threads. I want to run 10 thread before 10 another threads run and continue to stay of the threads array. Can anybody help me?

Sorry about my English. Thank in advance.

Answer 1

The following code will start 10 tasks, and wait for them to complete before starting the next 10 tasks. One word of caution is that the order in which the set of 10 tasks start is not guaranteed. That is, this example will block until the set of 10 are finished, but task 1 may start before task 0:

private static void Main()
{
   List<Task> tasks = new List<Task>();
   for (int i = 0; i < 100; i++)
   {
       if (i % 10 == 0)
       {
           Console.WriteLine("Waiting for all tasks to complete");
           Task.WaitAll(tasks.ToArray());
           Console.WriteLine("All tasks have completed. Continuing...");
           tasks.Clear();
       }

       tasks.Add(Task.Factory.StartNew(TrivialTask, new TaskState(i)));
   }
}

public class TaskState
{
    public TaskState(int id)
    {
        TaskId = id;
    }

    public int TaskId { get; set; }
}

private static void TrivialTask(object state)
{
    TaskState taskState = (TaskState) state;
    Thread.Sleep(1000);
    Console.WriteLine("Task " +  taskState.TaskId + " completed");
}