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);

    65 }

    66 

    67 void GCController::gcTimerFired(Timer<GCController>*)

    68 {

    69     collect(0);

    70 }

    71 

    72 void GCController::garbageCollectNow()

    73 {

    74     JSLock lock(SilenceAssertionsOnly);

    75     if (!JSDOMWindow::commonJSGlobalData()->heap.isBusy())

    76         collect(0);

    77 }

    78 

    79 void GCController::garbageCollectOnAlternateThreadForDebugging(bool waitUntilDone)

    80 {

    81 #if USE(PTHREADS)

    82     pthread_t thread;

    83     pthread_create(&thread, NULL, collect, NULL);

    84 

    85     if (waitUntilDone)

    86         pthread_join(thread, NULL);

    87 #endif

    88 }

    89 

    90 } // namespace WebCore