package threads;


var all = new array();      
var   m = new mutex();


// will cause garbage collection due to string allocations
function thread_func(sign) {
  var i, x = "hello";
  for (i = 0; i < 1000; ++i) 
  {
        // will be suspended here during gc cycle somewhere in pluses
	    x = x + " hello " + " goodbye ";
	    // will be awakened after gc cycle
	    print(sign);
  }
  print("*****");
  synchronized(m) 
  {  
  	all[sign] = new thread(thread_func,sign);
  }
}

// will not cause garbage collection. nothing allocating 
// will be active even during gc cycle
function nongc_thread_func() {
  var i,x = 0;
  for (i = 0; i < 1000; ++i) 
  {
	   x = x + 1;
	   print("_");
  }
  print("/////");
  new thread(nongc_thread_func);
}


function main()
{
	var i;
	for (i = 0; i < 10; ++i) all.push(new thread(thread_func,i));
	new thread(nongc_thread_func);
	var w;
	do  
	{
	  w = 0;
	  synchronized(m) 
	  {
		  for (i = 0; i < all.length; ++i) 
		  {        
		    if(all[i].running) w = 1;
		  }
	  }
	  print("-");
	} while(w);
}