Set minimum Windows wait time to 1 ms in MessagePumpDefault::Run

base/message_loop/message_pump_default.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_pump_default.h"
 
+#include <algorithm>
+
 #include "base/logging.h"
 #include "base/threading/thread_restrictions.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_nsautorelease_pool.h"
 #endif
 
 namespace base {
 
 MessagePumpDefault::MessagePumpDefault()
@@ skipping 28 matching lines @@
       break;
 
     if (did_work)
       continue;
 
     ThreadRestrictions::ScopedAllowWait allow_wait;
     if (delayed_work_time_.is_null()) {
       event_.Wait();
     } else {
       TimeDelta delay = delayed_work_time_ - TimeTicks::Now();
-      // If the delay is under 1 ms we need to execute the task right away.
-      if (delay.InMilliseconds() >= 1) {
+#if defined(OS_WIN)
+      // If the delay is greater than zero and under 1 ms we need to round up to
+      // 1 ms or else we will end up spinning until it counts down to zero
+      // because sub-ms waits aren't supported on Windows.
+      if (delay > TimeDelta())
+        delay = std::max(delay, TimeDelta::FromMilliseconds(1));
+#endif
+      if (delay > TimeDelta()) {
         event_.TimedWait(delay);
       } else {
         // It looks like delayed_work_time_ indicates a time in the past, so we
         // need to call DoDelayedWork now.
         delayed_work_time_ = TimeTicks();
       }
     }
     // Since event_ is auto-reset, we don't need to do anything special here
     // other than service each delegate method.
   }
@@ skipping 13 matching lines @@
 
 void MessagePumpDefault::ScheduleDelayedWork(
     const TimeTicks& delayed_work_time) {
   // We know that we can't be blocked on Wait right now since this method can
   // only be called on the same thread as Run, so we only need to update our
   // record of how long to sleep when we do sleep.
   delayed_work_time_ = delayed_work_time;
 }
 
 }  // namespace base