--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/DumpRenderTree/WorkQueue.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2007, 2009 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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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 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 "WorkQueue.h"
+
+#include "WorkQueueItem.h"
+#include <wtf/Assertions.h>
+
+static const unsigned queueLength = 1024;
+
+static WorkQueueItem* theQueue[queueLength];
+static unsigned startOfQueue;
+static unsigned endOfQueue;
+
+WorkQueue* WorkQueue::shared()
+{
+    static WorkQueue* sharedInstance = new WorkQueue;
+    return sharedInstance;
+}
+
+WorkQueue::WorkQueue()
+    : m_frozen(false)
+{
+}
+
+void WorkQueue::queue(WorkQueueItem* item)
+{
+    ASSERT(endOfQueue < queueLength);
+    ASSERT(endOfQueue >= startOfQueue);
+
+    if (m_frozen) {
+        delete item;
+        return;
+    }
+
+    theQueue[endOfQueue++] = item;
+}
+
+WorkQueueItem* WorkQueue::dequeue()
+{
+    ASSERT(endOfQueue >= startOfQueue);
+
+    if (startOfQueue == endOfQueue)
+        return 0;
+
+    return theQueue[startOfQueue++];
+}
+
+unsigned WorkQueue::count()
+{
+    return endOfQueue - startOfQueue;
+}
+
+void WorkQueue::clear()
+{
+    for (unsigned i = startOfQueue; i < endOfQueue; ++i) {
+        delete theQueue[i];
+        theQueue[i] = 0;
+    }
+
+    startOfQueue = 0;
+    endOfQueue = 0;
+}
+
+bool WorkQueue::processWork()
+{
+    bool startedLoad = false;
+
+    while (!startedLoad && count()) {
+        WorkQueueItem* item = dequeue();
+        ASSERT(item);
+        startedLoad = item->invoke();
+        delete item;
+    }
+
+    // If we're done and we didn't start a load, then we're really done, so return true.
+    return !startedLoad;
+}