- Add a per-isolate pseudo random number generator to the

runtime/lib/math_patch.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:typed_data";
 
 // A VM patch of the dart:math library.
 
 // If [x] is an [int] and [exponent] is a non-negative [int], the result is
 // an [int], otherwise the result is a [double].
@@ skipping 95 matching lines @@
 
   // Implements:
   //   var state = ((_A * (_state[kSTATE_LO])) + _state[kSTATE_HI]) & _MASK_64;
   //   _state[kSTATE_LO] = state & _MASK_32;
   //   _state[kSTATE_HI] = state >> 32;
   // This is a native to prevent 64-bit operations in Dart, which
   // fail with --throw_on_javascript_int_overflow.
   void _nextState() native "Random_nextState";
 
   int nextInt(int max) {
-    // TODO(srdjan): Remove the 'limit' check once optimizing  comparison of
+    // TODO(srdjan): Remove the 'limit' check once optimizing comparison of
     // Smi-s with Mint constants.
     final limit = 0x3FFFFFFF;
     if (max <= 0 || ((max > limit) && (max > _POW2_32))) {
       throw new ArgumentError("max must be positive and < 2^32:"
                                          " $max");
     }
     if ((max & -max) == max) {
       // Fast case for powers of two.
       _nextState();
       return _state[kSTATE_LO] & (max - 1);
@@ skipping 32 matching lines @@
   static int _nextSeed() {
     if (_prng == null) {
       // TODO(iposva): Use system to get a random seed.
       _prng = new Random(new DateTime.now().millisecondsSinceEpoch);
     }
     // Trigger the PRNG once to change the internal state.
     _prng._nextState();
     return _prng._state[kSTATE_LO];
   }
 }