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
35using namespace JSC;
36
37namespace WebCore {
38
39static void* collect(void*)
40{
41    JSLock lock(SilenceAssertionsOnly);
42    JSDOMWindow::commonJSGlobalData()->heap.collectAllGarbage();
43    return 0;
44}
45
46GCController& gcController()
47{
48    DEFINE_STATIC_LOCAL(GCController, staticGCController, ());
49    return staticGCController;
50}
51
52GCController::GCController()
53    : m_GCTimer(this, &GCController::gcTimerFired)
54{
55}
56
57void GCController::garbageCollectSoon()
58{
59    if (!m_GCTimer.isActive())
60        m_GCTimer.startOneShot(0);
61}
62
63void GCController::gcTimerFired(Timer<GCController>*)
64{
65    collect(0);
66}
67
68void GCController::garbageCollectNow()
69{
70    JSLock lock(SilenceAssertionsOnly);
71    if (!JSDOMWindow::commonJSGlobalData()->heap.isBusy())
72        collect(0);
73}
74
75void 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