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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2021 Alex Trotsenko <alex1973tr@gmail.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QWINDOWSPIPEWRITER_P_H
#define QWINDOWSPIPEWRITER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <qobject.h>
#include <qmutex.h>
#include <private/qringbuffer_p.h>
#include <qt_windows.h>
QT_BEGIN_NAMESPACE
class Q_CORE_EXPORT QWindowsPipeWriter : public QObject
{
Q_OBJECT
public:
explicit QWindowsPipeWriter(HANDLE pipeWriteEnd, QObject *parent = nullptr);
~QWindowsPipeWriter();
void setHandle(HANDLE hPipeWriteEnd);
void write(const QByteArray &ba);
void write(const char *data, qint64 size);
void stop();
bool checkForWrite() { return consumePendingAndEmit(false); }
qint64 bytesToWrite() const;
bool isWriteOperationActive() const;
HANDLE syncEvent() const { return syncHandle; }
Q_SIGNALS:
void bytesWritten(qint64 bytes);
void writeFailed();
protected:
bool event(QEvent *e) override;
private:
enum CompletionState { NoError, ErrorDetected, WriteDisabled };
template <typename... Args>
inline void writeImpl(Args... args);
void startAsyncWriteHelper(QMutexLocker<QMutex> *locker);
void startAsyncWriteLocked();
static void CALLBACK waitCallback(PTP_CALLBACK_INSTANCE instance, PVOID context,
PTP_WAIT wait, TP_WAIT_RESULT waitResult);
bool writeCompleted(DWORD errorCode, DWORD numberOfBytesWritten);
void notifyCompleted(QMutexLocker<QMutex> *locker);
bool consumePendingAndEmit(bool allowWinActPosting);
HANDLE handle;
HANDLE eventHandle;
HANDLE syncHandle;
PTP_WAIT waitObject;
OVERLAPPED overlapped;
QRingBuffer writeBuffer;
qint64 pendingBytesWrittenValue;
mutable QMutex mutex;
DWORD lastError;
CompletionState completionState;
bool stopped;
bool writeSequenceStarted;
bool bytesWrittenPending;
bool winEventActPosted;
};
QT_END_NAMESPACE
#endif // QWINDOWSPIPEWRITER_P_H
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