Fix a race in initialization of timezone cache in platform-win32.

src/date.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 44 matching lines @@
   // before UTC conversion.
   static const int64_t kMaxTimeBeforeUTCInMs =
       kMaxTimeInMs + 10 * kMsPerDay;
 
   // Sentinel that denotes an invalid local offset.
   static const int kInvalidLocalOffsetInMs = kMaxInt;
   // Sentinel that denotes an invalid cache stamp.
   // It is an invariant of DateCache that cache stamp is non-negative.
   static const int kInvalidStamp = -1;
 
-  DateCache() : stamp_(0) {
+  DateCache() : stamp_(0), tz_cache_(OS::CreateTimezoneCache()) {
     ResetDateCache();
   }
 
-  virtual ~DateCache() {}
+  virtual ~DateCache() {
+    OS::DisposeTimezoneCache(tz_cache_);
+    tz_cache_ = NULL;
+  }
 
 
   // Clears cached timezone information and increments the cache stamp.
   void ResetDateCache();
 
 
   // Computes floor(time_ms / kMsPerDay).
   static int DaysFromTime(int64_t time_ms) {
     if (time_ms < 0) time_ms -= (kMsPerDay - 1);
     return static_cast<int>(time_ms / kMsPerDay);
@@ skipping 26 matching lines @@
       local_offset_ms_ = GetLocalOffsetFromOS();
     }
     return local_offset_ms_;
   }
 
 
   const char* LocalTimezone(int64_t time_ms) {
     if (time_ms < 0 || time_ms > kMaxEpochTimeInMs) {
       time_ms = EquivalentTime(time_ms);
     }
-    return OS::LocalTimezone(static_cast<double>(time_ms));
+    return OS::LocalTimezone(static_cast<double>(time_ms), tz_cache_);
   }
 
   // ECMA 262 - 15.9.5.26
   int TimezoneOffset(int64_t time_ms) {
     int64_t local_ms = ToLocal(time_ms);
     return static_cast<int>((time_ms - local_ms) / kMsPerMin);
   }
 
   // ECMA 262 - 15.9.1.9
   int64_t ToLocal(int64_t time_ms) {
@@ skipping 48 matching lines @@
   // Cache stamp is used for invalidating caches in JSDate.
   // We increment the stamp each time when the timezone information changes.
   // JSDate objects perform stamp check and invalidate their caches if
   // their saved stamp is not equal to the current stamp.
   Smi* stamp() { return stamp_; }
   void* stamp_address() { return &stamp_; }
 
   // These functions are virtual so that we can override them when testing.
   virtual int GetDaylightSavingsOffsetFromOS(int64_t time_sec) {
     double time_ms = static_cast<double>(time_sec * 1000);
-    return static_cast<int>(OS::DaylightSavingsOffset(time_ms));
+    return static_cast<int>(OS::DaylightSavingsOffset(time_ms, tz_cache_));
   }
 
   virtual int GetLocalOffsetFromOS() {
-    double offset = OS::LocalTimeOffset();
+    double offset = OS::LocalTimeOffset(tz_cache_);
     ASSERT(offset < kInvalidLocalOffsetInMs);
     return static_cast<int>(offset);
   }
 
  private:
   // The implementation relies on the fact that no time zones have
   // more than one daylight savings offset change per 19 days.
   // In Egypt in 2010 they decided to suspend DST during Ramadan. This
   // led to a short interval where DST is in effect from September 10 to
   // September 30.
@@ skipping 46 matching lines @@
   DST* after_;
 
   int local_offset_ms_;
 
   // Year/Month/Day cache.
   bool ymd_valid_;
   int ymd_days_;
   int ymd_year_;
   int ymd_month_;
   int ymd_day_;
+
+  TimezoneCache* tz_cache_;
 };
 
 } }   // namespace v8::internal
 
 #endif