1/* 2 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#import "config.h" 30#import "MainThread.h" 31 32#import <CoreFoundation/CoreFoundation.h> 33#import <Foundation/NSThread.h> 34#import <stdio.h> 35#import <wtf/Assertions.h> 36#import <wtf/Threading.h> 37 38@interface WTFMainThreadCaller : NSObject { 39} 40- (void)call; 41@end 42 43@implementation WTFMainThreadCaller 44 45- (void)call 46{ 47 WTF::dispatchFunctionsFromMainThread(); 48} 49 50@end // implementation WTFMainThreadCaller 51 52namespace WTF { 53 54static WTFMainThreadCaller* staticMainThreadCaller; 55static bool isTimerPosted; // This is only accessed on the 'main' thread. 56static bool mainThreadEstablishedAsPthreadMain; 57static pthread_t mainThreadPthread; 58static NSThread* mainThreadNSThread; 59 60void initializeMainThreadPlatform() 61{ 62#if !defined(BUILDING_ON_TIGER) 63 ASSERT(!staticMainThreadCaller); 64 staticMainThreadCaller = [[WTFMainThreadCaller alloc] init]; 65 66 mainThreadEstablishedAsPthreadMain = false; 67 mainThreadPthread = pthread_self(); 68 mainThreadNSThread = [[NSThread currentThread] retain]; 69#else 70 ASSERT_NOT_REACHED(); 71#endif 72} 73 74void initializeMainThreadToProcessMainThreadPlatform() 75{ 76 if (!pthread_main_np()) 77 NSLog(@"WebKit Threading Violation - initial use of WebKit from a secondary thread."); 78 79 ASSERT(!staticMainThreadCaller); 80 staticMainThreadCaller = [[WTFMainThreadCaller alloc] init]; 81 82 mainThreadEstablishedAsPthreadMain = true; 83 mainThreadPthread = 0; 84 mainThreadNSThread = nil; 85} 86 87static void timerFired(CFRunLoopTimerRef timer, void*) 88{ 89 CFRelease(timer); 90 isTimerPosted = false; 91 WTF::dispatchFunctionsFromMainThread(); 92} 93 94static void postTimer() 95{ 96 ASSERT(isMainThread()); 97 98 if (isTimerPosted) 99 return; 100 101 isTimerPosted = true; 102 CFRunLoopAddTimer(CFRunLoopGetCurrent(), CFRunLoopTimerCreate(0, 0, 0, 0, 0, timerFired, 0), kCFRunLoopCommonModes); 103} 104 105void scheduleDispatchFunctionsOnMainThread() 106{ 107 ASSERT(staticMainThreadCaller); 108 109 if (isMainThread()) { 110 postTimer(); 111 return; 112 } 113 114 if (mainThreadEstablishedAsPthreadMain) { 115 ASSERT(!mainThreadNSThread); 116 [staticMainThreadCaller performSelectorOnMainThread:@selector(call) withObject:nil waitUntilDone:NO]; 117 return; 118 } 119 120#if !defined(BUILDING_ON_TIGER) 121 ASSERT(mainThreadNSThread); 122 [staticMainThreadCaller performSelector:@selector(call) onThread:mainThreadNSThread withObject:nil waitUntilDone:NO]; 123#else 124 ASSERT_NOT_REACHED(); 125#endif 126} 127 128bool isMainThread() 129{ 130 if (mainThreadEstablishedAsPthreadMain) { 131 ASSERT(!mainThreadPthread); 132 return pthread_main_np(); 133 } 134 135#if !defined(BUILDING_ON_TIGER) 136 ASSERT(mainThreadPthread); 137 return pthread_equal(pthread_self(), mainThreadPthread); 138#else 139 ASSERT_NOT_REACHED(); 140 return false; 141#endif 142} 143 144} // namespace WTF 145