nl_tokens: Collection of items that have been deferred
pl_tokens: function deferAdd ( id , task , parentChain ) { var self = this ; parentChain . waitingOn = ( parentChain . waitingOn || 0 ) + 1 ; if ( ! parentChain . waitingOnIds ) parentChain . waitingOnIds = [ ] ; parentChain . waitingOnIds . push ( id ) ; self . _deferred . push ( { <mask> : id || null , prereq : parentChain . prereq || [ ] , payload : function ( next ) { self . _context . _id = id ; run ( self . _options . context , task , function ( err , value ) { // Glue callback function to first arg if ( id ) self . _context [ id ] = value ; self . _deferredRunning -- ; if ( -- parentChain . waitingOn == 0 ) { parentChain . completed = true ; if ( self . _struct . length && self . _struct [ self . _structPointer ] . type == 'await' ) self . _execute ( err ) ; } self . _execute ( err ) ; } , ( parentChain . prereq || [ ] ) . map ( function ( pre ) { return self . _context [ pre ] ; } ) ) ; } } ) ; }