text: print("BEGIN currentop.js");
  
  // test basic currentop functionality + querying of nested documents
  t = db.jstests_currentop
  t.drop();
  
  for(i=0;i<100;i++) {
      t.save({ "num": i });
  }
  // Make sure data is written before we start reading it in parallel shells.
  db.getLastError();
  
  print("count:" + t.count());
  
  function ops(q) {
      printjson( db.currentOp().inprog );
      return db.currentOp(q).inprog;
  }
  
  print("start shell");
  
  // sleep for a second for each (of 100) documents; can be killed in between documents & test should complete before 100 seconds 
  s1 = startParallelShell("db.jstests_currentop.count( { '$where': function() { sleep(1000); } } )");
  
  print("sleep");
  sleep(1000);
  
  print("inprog:");
  printjson(db.currentOp().inprog)
  print()
  sleep(1);
  print("inprog:");
  printjson(db.currentOp().inprog)
  print()
  
  // need to wait for read to start
  print("wait have some ops");
  assert.soon( function(){
      return ops( { "locks.^test": "r", "ns": "test.jstests_currentop" } ).length + 
          ops({ "locks.^test": "R", "ns": "test.jstests_currentop" }).length >= 1;
  }, "have_some_ops");
  print("ok");
      
  s2 = startParallelShell( "db.jstests_currentop.update( { '$where': function() { sleep(150); } }, { 'num': 1 }, false, true ); db.getLastError()" );
  
  o = [];
  
  function f() {
      o = ops({ "ns": "test.jstests_currentop" });
  
      printjson(o);
  
      var writes = ops({ "locks.^test": "w", "ns": "test.jstests_currentop" }).length;
  
      var readops = ops({ "locks.^test": "r", "ns": "test.jstests_currentop" });
      print("readops:");
      printjson(readops);
      var reads = readops.length;
  
      print("total: " + o.length + " w: " + writes + " r:" + reads);
  
      return o.length > writes && o.length > reads;
  }
  
  print("go");
  
  assert.soon( f, "f" );
  
  // avoid waiting for the operations to complete (if soon succeeded)
  for(var i in o) {
      db.killOp(o[i].opid);
  }
  
  start = new Date();
  
  s1();
  s2();
  
  // don't want to pass if timeout killed the js function
  assert( ( new Date() ) - start < 30000 );
  