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/*
* Copyright (C) 2021 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
*/
#pragma once
#include "IPCSemaphore.h"
#include "StreamServerConnection.h"
#include <atomic>
#include <wtf/Deque.h>
#include <wtf/FunctionDispatcher.h>
#include <wtf/Lock.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
namespace IPC {
class WTF_CAPABILITY("is current") StreamConnectionWorkQueue final : public SerialFunctionDispatcher, public ThreadSafeRefCounted<StreamConnectionWorkQueue> {
public:
static Ref<StreamConnectionWorkQueue> create(const char* name)
{
return adoptRef(*new StreamConnectionWorkQueue(name));
}
StreamConnectionWorkQueue(const char*);
~StreamConnectionWorkQueue();
void addStreamConnection(StreamServerConnection&);
void removeStreamConnection(StreamServerConnection&);
void stopAndWaitForCompletion(WTF::Function<void()>&& cleanupFunction = nullptr);
void wakeUp();
Semaphore& wakeUpSemaphore();
// SerialFunctionDispatcher
void dispatch(WTF::Function<void()>&&) final;
#if ASSERT_ENABLED
void assertIsCurrent() const final;
#endif
private:
void startProcessingThread() WTF_REQUIRES_LOCK(m_lock);
void processStreams();
const char* const m_name;
Semaphore m_wakeUpSemaphore;
std::atomic<bool> m_shouldQuit { false };
mutable Lock m_lock;
RefPtr<Thread> m_processingThread WTF_GUARDED_BY_LOCK(m_lock);
Deque<Function<void()>> m_functions WTF_GUARDED_BY_LOCK(m_lock);
WTF::Function<void()> m_cleanupFunction WTF_GUARDED_BY_LOCK(m_lock);
Vector<Ref<StreamServerConnection>> m_connections WTF_GUARDED_BY_LOCK(m_lock);
friend void assertIsCurrent(const StreamConnectionWorkQueue&);
};
inline void assertIsCurrent(const StreamConnectionWorkQueue& queue) WTF_ASSERTS_ACQUIRED_CAPABILITY(queue)
{
#if ASSERT_ENABLED
queue.assertIsCurrent();
#endif
}
}
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