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diff --git a/Source/WebKit2/Platform/CoreIPC/BinarySemaphore.cpp b/Source/WebKit2/Platform/CoreIPC/BinarySemaphore.cpp
new file mode 100644
index 0000000..c975dff
--- /dev/null
+++ b/Source/WebKit2/Platform/CoreIPC/BinarySemaphore.cpp
@@ -0,0 +1,64 @@
+/*
+ * 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 "BinarySemaphore.h"
+
+namespace CoreIPC {
+
+BinarySemaphore::BinarySemaphore()
+    : m_isSet(false)
+{
+}
+    
+BinarySemaphore::~BinarySemaphore()
+{
+}
+
+void BinarySemaphore::signal()
+{
+    MutexLocker locker(m_mutex);
+
+    m_isSet = true;
+    m_condition.signal();
+}
+
+bool BinarySemaphore::wait(double absoluteTime)
+{
+    MutexLocker locker(m_mutex);
+
+    bool timedOut = false;
+    while (!m_isSet) {
+        timedOut = !m_condition.timedWait(m_mutex, absoluteTime);
+        if (timedOut)
+            return false;
+    }
+
+    // Reset the semaphore.
+    m_isSet = false;
+    return true;
+}
+
+
+} // namespace CoreIPC