148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
/*
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* Copyright (C) 2007-2019 Apple Inc. All rights reserved.
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*
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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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* are met:
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*
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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 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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*
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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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*/
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#include "config.h"
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#include <wtf/MainThread.h>
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#include <mutex>
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#include <wtf/Deque.h>
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#include <wtf/Lock.h>
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#include <wtf/MonotonicTime.h>
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#include <wtf/NeverDestroyed.h>
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#include <wtf/RunLoop.h>
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#include <wtf/StdLibExtras.h>
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#include <wtf/Threading.h>
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#include <wtf/threads/BinarySemaphore.h>
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namespace WTF {
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void initializeMainThread()
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{
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static std::once_flag initializeKey;
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std::call_once(initializeKey, [] {
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initialize();
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initializeMainThreadPlatform();
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RunLoop::initializeMain();
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});
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}
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#if !USE(WEB_THREAD)
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bool canCurrentThreadAccessThreadLocalData(Thread& thread)
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{
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return &thread == &Thread::current();
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}
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#endif
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bool isMainRunLoop()
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{
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return RunLoop::isMain();
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}
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void callOnMainRunLoop(Function<void()>&& function)
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{
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RunLoop::main().dispatch(WTFMove(function));
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}
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void ensureOnMainRunLoop(Function<void()>&& function)
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{
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if (RunLoop::isMain())
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function();
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else
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RunLoop::main().dispatch(WTFMove(function));
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}
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void callOnMainThread(Function<void()>&& function)
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{
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#if USE(WEB_THREAD)
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if (auto* webRunLoop = RunLoop::webIfExists()) {
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webRunLoop->dispatch(WTFMove(function));
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return;
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}
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#endif
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RunLoop::main().dispatch(WTFMove(function));
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}
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void ensureOnMainThread(Function<void()>&& function)
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{
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if (isMainThread())
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function();
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else
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callOnMainThread(WTFMove(function));
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}
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bool isMainThreadOrGCThread()
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{
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if (Thread::mayBeGCThread())
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return true;
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return isMainThread();
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}
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enum class MainStyle : bool {
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Thread,
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RunLoop
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};
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template <MainStyle mainStyle>
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static void callOnMainAndWait(Function<void()>&& function)
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{
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if (mainStyle == MainStyle::Thread ? isMainThread() : isMainRunLoop()) {
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function();
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return;
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}
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BinarySemaphore semaphore;
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auto functionImpl = [&semaphore, function = WTFMove(function)] {
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function();
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semaphore.signal();
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};
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switch (mainStyle) {
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case MainStyle::Thread:
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callOnMainThread(WTFMove(functionImpl));
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break;
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case MainStyle::RunLoop:
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callOnMainRunLoop(WTFMove(functionImpl));
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};
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semaphore.wait();
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}
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void callOnMainRunLoopAndWait(Function<void()>&& function)
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{
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callOnMainAndWait<MainStyle::RunLoop>(WTFMove(function));
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}
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void callOnMainThreadAndWait(Function<void()>&& function)
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{
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callOnMainAndWait<MainStyle::Thread>(WTFMove(function));
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}
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} // namespace WTF
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