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/*
* Copyright (C) 2022 Metrological Group B.V.
* Copyright (C) 2022 Igalia S.L.
*
* 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 <sys/eventfd.h>
#include <wtf/Noncopyable.h>
#include <wtf/SafeStrerror.h>
#include <wtf/text/CString.h>
#include <wtf/unix/UnixFileDescriptor.h>
namespace WebCore {
struct DMABufReleaseFlag {
WTF_MAKE_NONCOPYABLE(DMABufReleaseFlag);
DMABufReleaseFlag() = default;
enum InitializeTag { Initialize };
DMABufReleaseFlag(InitializeTag)
{
fd = { eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK), UnixFileDescriptor::Adopt };
}
~DMABufReleaseFlag() = default;
DMABufReleaseFlag(DMABufReleaseFlag&&) = default;
DMABufReleaseFlag& operator=(DMABufReleaseFlag&&) = default;
DMABufReleaseFlag dup() const
{
DMABufReleaseFlag flag;
flag.fd = fd.duplicate();
return flag;
}
bool released() const
{
if (!fd)
return true;
uint64_t value { 0 };
if (read(fd.value(), &value, sizeof(uint64_t)) == sizeof(uint64_t))
return !!value;
return false;
}
void release()
{
if (!fd)
return;
uint64_t value { 1 };
if (write(fd.value(), &value, sizeof(value)) != sizeof(value))
WTFLogAlways("Error writing to the eventfd at DMABufReleaseFlag: %s", safeStrerror(errno).data());
}
template<class Encoder> void encode(Encoder& encoder) &&
{
encoder << WTFMove(fd);
}
template<class Decoder> static std::optional<DMABufReleaseFlag> decode(Decoder& decoder)
{
auto fd = decoder.template decode<UnixFileDescriptor>();
if (!fd)
return std::nullopt;
DMABufReleaseFlag releaseFlag;
releaseFlag.fd = WTFMove(*fd);
return releaseFlag;
}
UnixFileDescriptor fd;
};
} // namespace WebCore
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