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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "bindings/v8/V8GCForContextDispose.h"
     33 
     34 #include "wtf/StdLibExtras.h"
     35 #include <v8.h>
     36 
     37 namespace WebCore {
     38 
     39 V8GCForContextDispose::V8GCForContextDispose()
     40     : m_pseudoIdleTimer(this, &V8GCForContextDispose::pseudoIdleTimerFired)
     41     , m_didDisposeContextForMainFrame(false)
     42 {
     43 }
     44 
     45 void V8GCForContextDispose::notifyContextDisposed(bool isMainFrame)
     46 {
     47     m_didDisposeContextForMainFrame = m_didDisposeContextForMainFrame || isMainFrame;
     48     v8::V8::ContextDisposedNotification();
     49     if (!m_pseudoIdleTimer.isActive())
     50         m_pseudoIdleTimer.startOneShot(0.8, FROM_HERE);
     51 }
     52 
     53 void V8GCForContextDispose::notifyIdleSooner(double maximumFireInterval)
     54 {
     55     if (m_pseudoIdleTimer.isActive()) {
     56         double nextFireInterval = m_pseudoIdleTimer.nextFireInterval();
     57         if (nextFireInterval > maximumFireInterval) {
     58             m_pseudoIdleTimer.stop();
     59             m_pseudoIdleTimer.startOneShot(maximumFireInterval, FROM_HERE);
     60         }
     61     }
     62 }
     63 
     64 V8GCForContextDispose& V8GCForContextDispose::instanceTemplate()
     65 {
     66     DEFINE_STATIC_LOCAL(V8GCForContextDispose, staticInstance, ());
     67     return staticInstance;
     68 }
     69 
     70 void V8GCForContextDispose::pseudoIdleTimerFired(Timer<V8GCForContextDispose>*)
     71 {
     72     const int longIdlePauseInMs = 1000;
     73     const int shortIdlePauseInMs = 10;
     74     int hint = m_didDisposeContextForMainFrame ? longIdlePauseInMs : shortIdlePauseInMs;
     75     v8::V8::IdleNotification(hint);
     76     m_didDisposeContextForMainFrame = false;
     77 }
     78 
     79 } // namespace WebCore
     80