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* Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#import "MainThread.h"
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#import <CoreFoundation/CoreFoundation.h>
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#import <Foundation/NSThread.h>
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#import <wtf/Assertions.h>
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#import <wtf/HashSet.h>
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#import <wtf/Threading.h>
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@interface JSWTFMainThreadCaller : NSObject {
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@implementation JSWTFMainThreadCaller
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WTF::dispatchFunctionsFromMainThread();
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@end // implementation JSWTFMainThreadCaller
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static JSWTFMainThreadCaller* staticMainThreadCaller;
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static bool isTimerPosted; // This is only accessed on the 'main' thread.
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static bool mainThreadEstablishedAsPthreadMain;
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static pthread_t mainThreadPthread;
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static NSThread* mainThreadNSThread;
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void initializeMainThreadPlatform()
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ASSERT(!staticMainThreadCaller);
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staticMainThreadCaller = [[JSWTFMainThreadCaller alloc] init];
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mainThreadEstablishedAsPthreadMain = false;
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mainThreadPthread = pthread_self();
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mainThreadNSThread = [[NSThread currentThread] retain];
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initializeGCThreads();
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void initializeMainThreadToProcessMainThreadPlatform()
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if (!pthread_main_np())
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NSLog(@"WebKit Threading Violation - initial use of WebKit from a secondary thread.");
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ASSERT(!staticMainThreadCaller);
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staticMainThreadCaller = [[JSWTFMainThreadCaller alloc] init];
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mainThreadEstablishedAsPthreadMain = true;
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mainThreadPthread = 0;
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mainThreadNSThread = nil;
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initializeGCThreads();
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static void timerFired(CFRunLoopTimerRef timer, void*)
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isTimerPosted = false;
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WTF::dispatchFunctionsFromMainThread();
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static void postTimer()
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ASSERT(isMainThread());
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isTimerPosted = true;
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CFRunLoopAddTimer(CFRunLoopGetCurrent(), CFRunLoopTimerCreate(0, 0, 0, 0, 0, timerFired, 0), kCFRunLoopCommonModes);
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void scheduleDispatchFunctionsOnMainThread()
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ASSERT(staticMainThreadCaller);
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if (isMainThread()) {
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if (mainThreadEstablishedAsPthreadMain) {
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ASSERT(!mainThreadNSThread);
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[staticMainThreadCaller performSelectorOnMainThread:@selector(call) withObject:nil waitUntilDone:NO];
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ASSERT(mainThreadNSThread);
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[staticMainThreadCaller performSelector:@selector(call) onThread:mainThreadNSThread withObject:nil waitUntilDone:NO];
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if (mainThreadEstablishedAsPthreadMain) {
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ASSERT(!mainThreadPthread);
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return pthread_main_np();
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ASSERT(mainThreadPthread);
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return pthread_equal(pthread_self(), mainThreadPthread);