concurrent_coroutines3.flx

fun ack(x:int,y:int):int =>
  if x == 0 then y + 1
  elif y == 0 then ack(x - 1, 1)
  else ack(x - 1, ack(x, y - 1))
  endif
;


fun thrid: 1 -> address ="pthread_self()"
  requires Posix_headers::pthread_h;

type atom = "::std::atomic_size_t" requires Cxx11_headers::atomic;
proc reset: &atom = "$1->store(0);";
proc incr: &atom * int = "*$1+=$2;";
fun get : atom -> size = "$1.load()";

var kk : atom;
reset &kk;

proc p (i:int) () {
  var x = ack(3,10);
  assert x > 0;
  incr (&kk,1);
}
var q = p;
proc many(threading:bool)
{
  reset &kk;
if threading do
  spawn_process { ; };
  spawn_process { ; };
  spawn_process { ; };
  spawn_process { ; };
  spawn_process { ; };
  spawn_process { ; };
done
  for (var i=0; i<200; ++i;) perform spawn_fthread (q i);
}


println$ "Spawn after launch";
var start = time();
async_run { many(false); };
println$ "Done Serial     kk = " + kk.get.str + ", elapsed=" + (time() - start).str;
start = time();
async_run { many(true); };
println$ "Done Concurrent kk = " + kk.get.str + ", elapsed=" + (time() - start).str;