c# - How to block new threads until all threads are created and started -

i building small application simulating horse race in order gain basic skill in working threads.

my code contains loop:

        (int = 0; < numberofhorses; i++)         {             horsesthreads[i] = new thread(horsestypes[i].race);             horsesthreads[i].start(100);         } 

in order keep race 'fair', i've been looking way make newly created threads wait until rest of new threads set, , launch of them start running methods (please note understand technically threads can't launched @ 'same time')

so basically, looking this:

        (int = 0; < numberofhorses; i++)         {             horsesthreads[i] = new thread(horsestypes[i].race);         }         monitor.launchthreads(horsesthreads); 

the barrier class designed support this.

here's example:

using system; using system.threading;  namespace demo {     class program     {         private void run()         {             int numberofhorses = 12;              // use barrier participant count 1 more             // number of threads. 1 main thread,             // used signal start of race.              using (barrier barrier = new barrier(numberofhorses + 1))             {                 var horsesthreads = new thread[numberofhorses];                  (int = 0; < numberofhorses; i++)                 {                     int horsenumber = i;                     horsesthreads[i] = new thread(() => runrace(horsenumber, barrier));                     horsesthreads[i].start();                 }                  console.writeline("press <return> start race!");                 console.readline();                  // signals start of race. none of threads called                 // signalandwait() return call until *all*                  // participants have signalled barrier.                  barrier.signalandwait();                  console.writeline("race started!");                 console.readline();             }         }          private static void runrace(int horsenumber, barrier barrier)         {             console.writeline("horse " + horsenumber + " waiting start.");             barrier.signalandwait();             console.writeline("horse " + horsenumber + " has started.");         }          private static void main()         {             new program().run();         }     } } 

[edit] noticed henk mentioned barrier, i'll leave answer here because has sample code.