using System;
using System.Threading;
using System.Threading.Tasks;
using System.Diagnostics;class S{public static void Main(){pcount = Environment.ProcessorCount;Console.WriteLine("Proc count = " + pcount);ThreadPool.SetMinThreads(4, -1);ThreadPool.SetMaxThreads(4, -1);t1 = new Task(A, 1);t2 = new Task(A, 2);t3 = new Task(A, 3);t4 = new Task(A, 4);Console.WriteLine("Starting t1 " + t1.Id.ToString());t1.Start();Console.WriteLine("Starting t2 " + t2.Id.ToString());t2.Start();Console.WriteLine("Starting t3 " + t3.Id.ToString());t3.Start();Console.WriteLine("Starting t4 " + t4.Id.ToString());t4.Start();Console.ReadLine();}static void A(object o){B(o);}static void B(object o){C(o);}static void C(object o){int temp = (int)o;Interlocked.Increment(ref aa);while (aa < 4){;}if (temp == 1){// BP1 - all tasks in C
Debugger.Break();waitFor1 = false;}else{while (waitFor1){;}}switch (temp){case 1:D(o);break;case 2:F(o);break;case 3:case 4:I(o);break;default:Debug.Assert(false, "fool");break;}}static void D(object o){E(o);}static void E(object o){// break here at the same time as H and Kwhile (bb < 2){;}//BP2 - 1 in E, 2 in H, 3 in J, 4 in K
Debugger.Break();Interlocked.Increment(ref bb);//after
L(o);}static void F(object o){G(o);}static void G(object o){H(o);}static void H(object o){// break here at the same time as E and K
Interlocked.Increment(ref bb);Monitor.Enter(mylock);while (bb < 3){;}Monitor.Exit(mylock);//after
L(o);}static void I(object o){J(o);}static void J(object o){int temp2 = (int)o;switch (temp2){case 3:t4.Wait();break;case 4:K(o);break;default:Debug.Assert(false, "fool2");break;}}static void K(object o){// break here at the same time as E and H
Interlocked.Increment(ref bb);Monitor.Enter(mylock);while (bb < 3){;}Monitor.Exit(mylock);//after
L(o);}static void L(object oo){int temp3 = (int)oo;switch (temp3){case 1:M(oo);break;case 2:N(oo);break;case 4:O(oo);break;default:Debug.Assert(false, "fool3");break;}}static void M(object o){// breaks here at the same time as N and Q
Interlocked.Increment(ref cc);while (cc < 3){;}//BP3 - 1 in M, 2 in N, 3 still in J, 4 in O, 5 in Q
Debugger.Break();Interlocked.Increment(ref cc);while (true)Thread.Sleep(500); // for ever
}static void N(object o){// breaks here at the same time as M and Q
Interlocked.Increment(ref cc);while (cc < 4){;}R(o);}static void O(object o){Task t5 = Task.Factory.StartNew(P, TaskCreationOptions.AttachedToParent);t5.Wait();R(o);}static void P(){Console.WriteLine("t5 runs " + Task.CurrentId.ToString());Q();}static void Q(){// breaks here at the same time as N and M
Interlocked.Increment(ref cc);while (cc < 4){;}// task 5 dies here freeing task 4 (its parent)
Console.WriteLine("t5 dies " + Task.CurrentId.ToString());waitFor5 = false;}static void R(object o){if ((int)o == 2){//wait for task5 to diewhile (waitFor5) { ;}int i;//spin up all procsfor (i = 0; i < pcount - 4; i++){Task t = Task.Factory.StartNew(() => { while (true);});Console.WriteLine("Started task " + t.Id.ToString());}Task.Factory.StartNew(T, i + 1 + 5, TaskCreationOptions.AttachedToParent); //scheduled
Task.Factory.StartNew(T, i + 2 + 5, TaskCreationOptions.AttachedToParent); //scheduled
Task.Factory.StartNew(T, i + 3 + 5, TaskCreationOptions.AttachedToParent); //scheduled
Task.Factory.StartNew(T, i + 4 + 5, TaskCreationOptions.AttachedToParent); //scheduled
Task.Factory.StartNew(T, (i + 5 + 5).ToString(), TaskCreationOptions.AttachedToParent); //scheduled//BP4 - 1 in M, 2 in R, 3 in J, 4 in R, 5 died
Debugger.Break();}else{Debug.Assert((int)o == 4);t3.Wait();}}static void T(object o){Console.WriteLine("Scheduled run " + Task.CurrentId.ToString());}static Task t1, t2, t3, t4;static int aa = 0;static int bb = 0;static int cc = 0;static bool waitFor1 = true;static bool waitFor5 = true;static int pcount;static S mylock = new S();}