1 files changed, 84 insertions, 0 deletions
diff --git a/Source/WebKit2/UIProcess/ResponsivenessTimer.cpp b/Source/WebKit2/UIProcess/ResponsivenessTimer.cpp
new file mode 100644
index 0000000..da54a7e
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+++ b/Source/WebKit2/UIProcess/ResponsivenessTimer.cpp
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+/*
+ * Copyright (C) 2010 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "ResponsivenessTimer.h"
+
+#include "WorkItem.h"
+
+namespace WebKit {
+
+static const double kResponsivenessTimeout = 3;
+
+ResponsivenessTimer::ResponsivenessTimer(ResponsivenessTimer::Client* client)
+    : m_client(client)
+    , m_isResponsive(true)
+    , m_timer(RunLoop::main(), this, &ResponsivenessTimer::timerFired)
+{
+}
+
+ResponsivenessTimer::~ResponsivenessTimer()
+{
+    m_timer.stop();
+}
+
+void ResponsivenessTimer::invalidate()
+{
+    m_timer.stop();
+}
+
+void ResponsivenessTimer::timerFired()
+{
+    // We'll never schedule the timer unless we're responsive.
+    ASSERT(m_isResponsive);
+    
+    m_isResponsive = false;
+    m_client->didBecomeUnresponsive(this);
+
+    m_timer.stop();
+}
+    
+void ResponsivenessTimer::start()
+{
+    if (m_timer.isActive())
+        return;
+
+    if (!m_isResponsive)
+        return;
+
+    m_timer.startOneShot(kResponsivenessTimeout);
+}
+
+void ResponsivenessTimer::stop()
+{
+    if (!m_isResponsive) {
+        // We got a life sign from the web process!
+        m_client->didBecomeResponsive(this);
+        m_isResponsive = true;
+    }
+
+    m_timer.stop();
+}
+
+} // namespace WebKit