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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 <runtime/Collector.h>
     33 #include <wtf/StdLibExtras.h>
     34 
     35 #if USE(PTHREADS)
     36 #include <pthread.h>
     37 #endif
     38 
     39 using namespace JSC;
     40 
     41 namespace WebCore {
     42 
     43 static void* collect(void*)
     44 {
     45     JSLock lock(SilenceAssertionsOnly);
     46     JSDOMWindow::commonJSGlobalData()->heap.collectAllGarbage();
     47     return 0;
     48 }
     49 
     50 GCController& gcController()
     51 {
     52     DEFINE_STATIC_LOCAL(GCController, staticGCController, ());
     53     return staticGCController;
     54 }
     55 
     56 GCController::GCController()
     57     : m_GCTimer(this, &GCController::gcTimerFired)
     58 {
     59 }
     60 
     61 void GCController::garbageCollectSoon()
     62 {
     63     if (!m_GCTimer.isActive())
     64         m_GCTimer.startOneShot(0.5);
     65 }
     66 
     67 void GCController::gcTimerFired(Timer<GCController>*)
     68 {
     69     collect(0);
     70 }
     71 
     72 void GCController::garbageCollectNow()
     73 {
     74     collect(0);
     75 }
     76 
     77 void GCController::garbageCollectOnAlternateThreadForDebugging(bool waitUntilDone)
     78 {
     79 #if USE(PTHREADS)
     80     pthread_t thread;
     81     pthread_create(&thread, NULL, collect, NULL);
     82 
     83     if (waitUntilDone)
     84         pthread_join(thread, NULL);
     85 #endif
     86 }
     87 
     88 } // namespace WebCore
     89