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      1 /*
      2  * Copyright (C) 2007 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "GCController.h"
     28 
     29 #include "JSDOMWindow.h"
     30 #include <runtime/JSGlobalData.h>
     31 #include <runtime/JSLock.h>
     32 #include <heap/Heap.h>
     33 #include <wtf/StdLibExtras.h>
     34 
     35 using namespace JSC;
     36 
     37 namespace WebCore {
     38 
     39 static void* collect(void*)
     40 {
     41     JSLock lock(SilenceAssertionsOnly);
     42     JSDOMWindow::commonJSGlobalData()->heap.collectAllGarbage();
     43     return 0;
     44 }
     45 
     46 GCController& gcController()
     47 {
     48     DEFINE_STATIC_LOCAL(GCController, staticGCController, ());
     49     return staticGCController;
     50 }
     51 
     52 GCController::GCController()
     53     : m_GCTimer(this, &GCController::gcTimerFired)
     54 {
     55 }
     56 
     57 void GCController::garbageCollectSoon()
     58 {
     59     if (!m_GCTimer.isActive())
     60         m_GCTimer.startOneShot(0);
     61 }
     62 
     63 void GCController::gcTimerFired(Timer<GCController>*)
     64 {
     65     collect(0);
     66 }
     67 
     68 void GCController::garbageCollectNow()
     69 {
     70     JSLock lock(SilenceAssertionsOnly);
     71     if (!JSDOMWindow::commonJSGlobalData()->heap.isBusy())
     72         collect(0);
     73 }
     74 
     75 void GCController::garbageCollectOnAlternateThreadForDebugging(bool waitUntilDone)
     76 {
     77     ThreadIdentifier threadID = createThread(collect, 0, "WebCore: GCController");
     78 
     79     if (waitUntilDone) {
     80         waitForThreadCompletion(threadID, 0);
     81         return;
     82     }
     83 
     84     detachThread(threadID);
     85 }
     86 
     87 } // namespace WebCore
     88