Remove BinarySemaphore, which is unused.

Source/WTF/wtf/threads/BinarySemaphore.cpp

-/*
- * 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 "config.h"
-#include "BinarySemaphore.h"
-
-#if !PLATFORM(WIN)
-
-namespace WTF {
-
-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 WTF
-
-#endif // !PLATFORM(WIN)