1 files changed, 144 insertions, 0 deletions
diff --git a/WebCore/bindings/generic/ActiveDOMCallback.cpp b/WebCore/bindings/generic/ActiveDOMCallback.cpp
new file mode 100644
index 0000000..2e69d10
--- /dev/null
+++ b/WebCore/bindings/generic/ActiveDOMCallback.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ActiveDOMCallback.h"
+
+#include "ActiveDOMObject.h"
+#include "ScriptExecutionContext.h"
+#include <wtf/PassOwnPtr.h>
+#include <wtf/ThreadingPrimitives.h>
+
+namespace WebCore {
+
+static void destroyOnContextThread(PassOwnPtr<ActiveDOMObjectCallbackImpl>);
+
+class DestroyOnContextThreadTask : public ScriptExecutionContext::Task {
+public:
+    static PassOwnPtr<DestroyOnContextThreadTask> create(PassOwnPtr<ActiveDOMObjectCallbackImpl> impl)
+    {
+        return adoptPtr(new DestroyOnContextThreadTask(impl));
+    }
+
+    virtual void performTask(ScriptExecutionContext*)
+    {
+        destroyOnContextThread(m_impl.release());
+    }
+
+private:
+    DestroyOnContextThreadTask(PassOwnPtr<ActiveDOMObjectCallbackImpl> impl)
+        : m_impl(impl)
+    {
+    }
+
+    OwnPtr<ActiveDOMObjectCallbackImpl> m_impl;
+};
+
+// Instances of this class are accessed only on the context thread, so we don't need to use locks.
+class ActiveDOMObjectCallbackImpl : public ActiveDOMObject {
+public:
+    ActiveDOMObjectCallbackImpl(ScriptExecutionContext* context)
+        : ActiveDOMObject(context, this)
+        , m_suspended(false)
+        , m_stopped(false)
+    {
+    }
+
+    virtual void contextDestroyed()
+    {
+        MutexLocker locker(m_mutex);
+        ActiveDOMObject::contextDestroyed();
+    }
+    virtual bool canSuspend() const { return false; }
+    virtual void suspend()
+    {
+        MutexLocker locker(m_mutex);
+        m_suspended = true;
+    }
+    virtual void resume()
+    {
+        MutexLocker locker(m_mutex);
+        m_suspended = false;
+    }
+    virtual void stop()
+    {
+        MutexLocker locker(m_mutex);
+        m_stopped = true;
+    }
+    bool canInvokeCallback()
+    {
+        MutexLocker locker(m_mutex);
+        return (!m_suspended && !m_stopped);
+    }
+    ScriptExecutionContext* scriptExecutionContext()
+    {
+        MutexLocker locker(m_mutex);
+        return ActiveDOMObject::scriptExecutionContext();
+    }
+    Mutex& mutex() { return m_mutex; }
+
+private:
+    Mutex m_mutex;
+    bool m_suspended;
+    bool m_stopped;
+};
+
+static void destroyOnContextThread(PassOwnPtr<ActiveDOMObjectCallbackImpl> impl)
+{
+    OwnPtr<ActiveDOMObjectCallbackImpl> implOwnPtr = impl;
+
+    ScriptExecutionContext* context = implOwnPtr->scriptExecutionContext();
+    MutexLocker locker(implOwnPtr->mutex());
+    if (context && !context->isContextThread())
+        context->postTask(DestroyOnContextThreadTask::create(implOwnPtr.release()));
+}
+
+ActiveDOMCallback::ActiveDOMCallback(ScriptExecutionContext* context)
+    : m_impl(new ActiveDOMObjectCallbackImpl(context))
+{
+    ASSERT(context->isContextThread());
+}
+
+ActiveDOMCallback::~ActiveDOMCallback()
+{
+    destroyOnContextThread(m_impl.release());
+}
+
+bool ActiveDOMCallback::canInvokeCallback() const
+{
+    return m_impl->canInvokeCallback();
+}
+
+ScriptExecutionContext* ActiveDOMCallback::scriptExecutionContext() const
+{
+    return m_impl->scriptExecutionContext();
+}
+
+} // namespace WebCore