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diff --git a/Source/JavaScriptCore/wtf/mac/MainThreadMac.mm b/Source/JavaScriptCore/wtf/mac/MainThreadMac.mm
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+++ b/Source/JavaScriptCore/wtf/mac/MainThreadMac.mm
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+/*
+ * Copyright (C) 2007, 2008 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.
+ */
+ 
+#import "config.h"
+#import "MainThread.h"
+
+#import <CoreFoundation/CoreFoundation.h>
+#import <Foundation/NSThread.h>
+#import <stdio.h>
+#import <wtf/Assertions.h>
+#import <wtf/HashSet.h>
+#import <wtf/Threading.h>
+#import <wtf/ThreadSpecific.h>
+
+@interface JSWTFMainThreadCaller : NSObject {
+}
+- (void)call;
+@end
+
+@implementation JSWTFMainThreadCaller
+
+- (void)call
+{
+    WTF::dispatchFunctionsFromMainThread();
+}
+
+@end // implementation JSWTFMainThreadCaller
+
+namespace WTF {
+
+static JSWTFMainThreadCaller* staticMainThreadCaller;
+static bool isTimerPosted; // This is only accessed on the 'main' thread.
+static bool mainThreadEstablishedAsPthreadMain;
+static pthread_t mainThreadPthread;
+static NSThread* mainThreadNSThread;
+
+#if ENABLE(PARALLEL_GC)
+static ThreadSpecific<bool>* isGCThread;
+
+static void initializeGCThreads()
+{
+    isGCThread = new ThreadSpecific<bool>();
+}
+#else
+static void initializeGCThreads() { }
+#endif
+
+void initializeMainThreadPlatform()
+{
+    ASSERT(!staticMainThreadCaller);
+    staticMainThreadCaller = [[JSWTFMainThreadCaller alloc] init];
+
+    mainThreadEstablishedAsPthreadMain = false;
+    mainThreadPthread = pthread_self();
+    mainThreadNSThread = [[NSThread currentThread] retain];
+    
+    initializeGCThreads();
+}
+
+void initializeMainThreadToProcessMainThreadPlatform()
+{
+    if (!pthread_main_np())
+        NSLog(@"WebKit Threading Violation - initial use of WebKit from a secondary thread.");
+
+    ASSERT(!staticMainThreadCaller);
+    staticMainThreadCaller = [[JSWTFMainThreadCaller alloc] init];
+
+    mainThreadEstablishedAsPthreadMain = true;
+    mainThreadPthread = 0;
+    mainThreadNSThread = nil;
+    
+    initializeGCThreads();
+}
+
+static void timerFired(CFRunLoopTimerRef timer, void*)
+{
+    CFRelease(timer);
+    isTimerPosted = false;
+    WTF::dispatchFunctionsFromMainThread();
+}
+
+static void postTimer()
+{
+    ASSERT(isMainThread());
+
+    if (isTimerPosted)
+        return;
+
+    isTimerPosted = true;
+    CFRunLoopAddTimer(CFRunLoopGetCurrent(), CFRunLoopTimerCreate(0, 0, 0, 0, 0, timerFired, 0), kCFRunLoopCommonModes);
+}
+
+void scheduleDispatchFunctionsOnMainThread()
+{
+    ASSERT(staticMainThreadCaller);
+
+    if (isMainThread()) {
+        postTimer();
+        return;
+    }
+
+    if (mainThreadEstablishedAsPthreadMain) {
+        ASSERT(!mainThreadNSThread);
+        [staticMainThreadCaller performSelectorOnMainThread:@selector(call) withObject:nil waitUntilDone:NO];
+        return;
+    }
+
+    ASSERT(mainThreadNSThread);
+    [staticMainThreadCaller performSelector:@selector(call) onThread:mainThreadNSThread withObject:nil waitUntilDone:NO];
+}
+
+bool isMainThread()
+{
+    if (mainThreadEstablishedAsPthreadMain) {
+        ASSERT(!mainThreadPthread);
+        return pthread_main_np();
+    }
+
+    ASSERT(mainThreadPthread);
+    return pthread_equal(pthread_self(), mainThreadPthread);
+}
+
+#if ENABLE(PARALLEL_GC)
+void registerGCThread()
+{
+    if (!isGCThread) {
+        // This happens if we're running in a process that doesn't care about
+        // MainThread.
+        return;
+    }
+
+    **isGCThread = true;
+}
+
+bool isMainThreadOrGCThread()
+{
+    if (isGCThread->isSet() && **isGCThread)
+        return true;
+    
+    return isMainThread();
+}
+#else
+// This is necessary because JavaScriptCore.exp doesn't support preprocessor macros.
+bool isMainThreadOrGCThread()
+{
+    return isMainThread();
+}
+#endif
+
+} // namespace WTF