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/*
* Copyright (C) 2023 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 "Decoder.h"
#include "Encoder.h"
#include "IPCSemaphore.h"
#include <wtf/TZoneMallocInlines.h>
namespace IPC {
struct EventSignalPair;
std::optional<EventSignalPair> createEventSignalPair();
// A waitable Event object (and corresponding Signal object), where the
// Signal object can be serialized across IPC.
// The wait operation will be interrupted if the Signal instance is
// destroyed (including if the remote process that owns it crashes or is
// killed).
// FIXME: Write proper interruptible implementations for non-COCOA platforms.
class Signal {
WTF_MAKE_TZONE_ALLOCATED_INLINE(Signal);
WTF_MAKE_NONCOPYABLE(Signal);
public:
Signal(Signal&& other) = default;
Signal& operator=(Signal&& other) = default;
#if PLATFORM(COCOA)
void signal();
MachSendRight takeSendRight() { return WTFMove(m_sendRight); }
#else
void signal()
{
m_semaphore.signal();
}
const Semaphore& semaphore() const { return m_semaphore; }
#endif
private:
friend struct IPC::ArgumentCoder<Signal, void>;
friend std::optional<EventSignalPair> createEventSignalPair();
#if PLATFORM(COCOA)
Signal(MachSendRight&& sendRight)
: m_sendRight(WTFMove(sendRight))
{ }
#else
Signal(Semaphore&& semaphore)
: m_semaphore(WTFMove(semaphore))
{ }
#endif
#if PLATFORM(COCOA)
MachSendRight m_sendRight;
#else
Semaphore m_semaphore;
#endif
};
class Event {
WTF_MAKE_TZONE_ALLOCATED_INLINE(Event);
WTF_MAKE_NONCOPYABLE(Event);
public:
#if PLATFORM(COCOA)
~Event();
Event(Event&& other)
: m_receiveRight(WTFMove(other.m_receiveRight))
{
other.m_receiveRight = MACH_PORT_NULL;
}
Event& operator=(Event&& other)
{
m_receiveRight = WTFMove(other.m_receiveRight);
other.m_receiveRight = MACH_PORT_NULL;
return *this;
}
bool wait();
bool waitFor(Timeout);
#else
Event(Event&& other) = default;
Event& operator=(Event&& other) = default;
bool wait()
{
return m_semaphore.wait();
}
bool waitFor(Timeout timeout)
{
return m_semaphore.waitFor(timeout);
}
#endif
private:
friend std::optional<EventSignalPair> createEventSignalPair();
#if PLATFORM(COCOA)
Event(mach_port_t port)
: m_receiveRight(port)
{ }
#else
Event(Semaphore&& semaphore)
: m_semaphore(WTFMove(semaphore))
{ }
#endif
#if PLATFORM(COCOA)
mach_port_t m_receiveRight;
#else
Semaphore m_semaphore;
#endif
};
struct EventSignalPair {
Event event;
Signal signal;
};
#if !PLATFORM(COCOA)
inline std::optional<EventSignalPair> createEventSignalPair()
{
Semaphore event;
#if PLATFORM(WIN)
Semaphore signal(Win32Handle { event.m_semaphoreHandle });
#else
Semaphore signal(event.m_fd.duplicate());
#endif
return EventSignalPair { Event { WTFMove(event) }, Signal { WTFMove(signal) } };
}
#endif
} // namespace IPC
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