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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 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 <wtf/MainThread.h>
#import <CoreFoundation/CoreFoundation.h>
#import <Foundation/NSThread.h>
#import <dispatch/dispatch.h>
#import <stdio.h>
#import <wtf/Assertions.h>
#import <wtf/HashSet.h>
#import <wtf/RetainPtr.h>
#import <wtf/SchedulePair.h>
#import <wtf/Threading.h>
#if USE(WEB_THREAD)
#include <wtf/ios/WebCoreThread.h>
#endif
@interface JSWTFMainThreadCaller : NSObject
- (void)call;
@end
@implementation JSWTFMainThreadCaller
- (void)call
{
WTF::dispatchFunctionsFromMainThread();
}
@end
namespace WTF {
static JSWTFMainThreadCaller* staticMainThreadCaller;
static bool isTimerPosted; // This is only accessed on the main thread.
static bool mainThreadEstablishedAsPthreadMain { false };
static pthread_t mainThreadPthread { nullptr };
static NSThread* mainThreadNSThread { nullptr };
#if USE(WEB_THREAD)
static Thread* sApplicationUIThread;
static Thread* sWebThread;
#endif
void initializeMainThreadPlatform()
{
ASSERT(!staticMainThreadCaller);
staticMainThreadCaller = [[JSWTFMainThreadCaller alloc] init];
#if !USE(WEB_THREAD)
mainThreadEstablishedAsPthreadMain = false;
mainThreadPthread = pthread_self();
mainThreadNSThread = [NSThread currentThread];
#else
mainThreadEstablishedAsPthreadMain = true;
ASSERT(!mainThreadPthread);
ASSERT(!mainThreadNSThread);
#endif
}
#if !USE(WEB_THREAD)
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;
}
#endif // !USE(WEB_THREAD)
static void timerFired(CFRunLoopTimerRef timer, void*)
{
CFRelease(timer);
isTimerPosted = false;
@autoreleasepool {
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 (isWebThread()) {
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];
}
void dispatchAsyncOnMainThreadWithWebThreadLockIfNeeded(void (^block)())
{
#if USE(WEB_THREAD)
if (WebCoreWebThreadIsEnabled && WebCoreWebThreadIsEnabled()) {
dispatch_async(dispatch_get_main_queue(), ^{
WebCoreWebThreadLock();
block();
});
return;
}
#endif
dispatch_async(dispatch_get_main_queue(), block);
}
void callOnWebThreadOrDispatchAsyncOnMainThread(void (^block)())
{
#if USE(WEB_THREAD)
if (WebCoreWebThreadIsEnabled && WebCoreWebThreadIsEnabled()) {
WebCoreWebThreadRun(block);
return;
}
#endif
dispatch_async(dispatch_get_main_queue(), block);
}
#if USE(WEB_THREAD)
static bool webThreadIsUninitializedOrLockedOrDisabled()
{
return !WebCoreWebThreadIsLockedOrDisabled || WebCoreWebThreadIsLockedOrDisabled();
}
bool isMainThread()
{
return (isWebThread() || pthread_main_np()) && webThreadIsUninitializedOrLockedOrDisabled();
}
bool isMainThreadIfInitialized()
{
return isMainThread();
}
bool isMainThreadInitialized()
{
return true;
}
bool isUIThread()
{
return pthread_main_np();
}
// Keep in mind that isWebThread can be called even when destroying the current thread.
bool isWebThread()
{
return pthread_equal(pthread_self(), mainThreadPthread);
}
void initializeApplicationUIThread()
{
ASSERT(pthread_main_np());
sApplicationUIThread = &Thread::current();
}
void initializeWebThreadPlatform()
{
ASSERT(!pthread_main_np());
mainThreadEstablishedAsPthreadMain = false;
mainThreadPthread = pthread_self();
mainThreadNSThread = [NSThread currentThread];
sWebThread = &Thread::current();
}
bool canAccessThreadLocalDataForThread(Thread& thread)
{
Thread& currentThread = Thread::current();
if (&thread == &currentThread)
return true;
if (&thread == sWebThread || &thread == sApplicationUIThread)
return (&currentThread == sWebThread || &currentThread == sApplicationUIThread) && webThreadIsUninitializedOrLockedOrDisabled();
return false;
}
#else
bool isMainThread()
{
if (mainThreadEstablishedAsPthreadMain) {
ASSERT(!mainThreadPthread);
return pthread_main_np();
}
ASSERT(mainThreadPthread);
return pthread_equal(pthread_self(), mainThreadPthread);
}
bool isMainThreadIfInitialized()
{
if (mainThreadEstablishedAsPthreadMain)
return pthread_main_np();
return pthread_equal(pthread_self(), mainThreadPthread);
}
bool isMainThreadInitialized()
{
return mainThreadEstablishedAsPthreadMain || mainThreadPthread;
}
#endif // USE(WEB_THREAD)
} // namespace WTF