monitor - wait and pulse Exception in C# -

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i have simulation druring time. in every steps have 4 main function f1,f2,f3,f4. f1 must run before , f2 , f3 can run after f1 parallel. when f2 , f3 finished can start f4. want create 4 task these. don't want create task in every step.(because has overhead) want after 1 task , wait next step. write code give exception.

task taskf1, taskf2, taskf3, taskf4;     bool lockf1,lockf2, lockf3, lockf4_1,lockf4_2;     random r;     public void f()     {         r = new random();         taskf1 = task.factory.startnew(f1);         taskf2 = task.factory.startnew(f2);         taskf3 = task.factory.startnew(f3);         taskf4 = task.factory.startnew(f4);         monitor.pulse(lockf1);      }     private void f1()     {         while (true)         {             monitor.wait(lockf1);             console.writeline("task 1");             thread.sleep((int)(r.nextdouble() * 1000.0));             monitor.pulse(lockf2);             monitor.pulse(lockf3);         }     }     private void f2()     {         while (true)         {             monitor.wait(lockf2);             console.writeline("task 2");             thread.sleep((int)(r.nextdouble() * 1000.0));             monitor.pulse(lockf4_1);         }     }     private void f3()     {         while (true)         {             monitor.wait(lockf3);             console.writeline("task 3");             thread.sleep((int)(r.nextdouble() * 1000.0));             monitor.pulse(lockf4_2);         }     }     private void f4()     {         while (true)         {             monitor.wait(lockf4_1);             monitor.wait(lockf4_2);             console.writeline("task 4");             thread.sleep((int)(r.nextdouble() * 1000.0));             monitor.pulse(lockf1);         }     }

i give exception in 1 of monitor.wait(lockfn) 

system.threading.synchronizationlockexception unhandled user code hresult=-2146233064 message=object synchronization method called unsynchronized block of code. source=mscorlib stacktrace:    @ system.threading.monitor.objwait(boolean exitcontext, int32 millisecondstimeout, object obj)    @ system.threading.monitor.wait(object obj, int32 millisecondstimeout, boolean exitcontext)    @ system.threading.monitor.wait(object obj)    @ parallel_test.program.f1() in c:\users\sharafi\documents\visual studio 2013\projects\parallel test\parallel test\program.cs:line 191    @ system.threading.tasks.task.innerinvoke()    @ system.threading.tasks.task.execute() innerexception:

isn't trying achieve:

var firsttask = new task(f1); var secondtask = firsttask.continuewith(ignored => f2()); var thirdtask  = firsttask.continuewith(ignored => f3()); var fourthtask = task.whenall(secondtask, thirdtask).continuewith(ignored => f4());  firsttask.start();

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