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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
#ifndef QXCBEVENTQUEUE_H
#define QXCBEVENTQUEUE_H
#include <QtCore/QThread>
#include <QtCore/QHash>
#include <QtCore/QEventLoop>
#include <QtCore/QVector>
#include <QtCore/QMutex>
#include <QtCore/QWaitCondition>
#include <xcb/xcb.h>
#include <atomic>
QT_BEGIN_NAMESPACE
struct QXcbEventNode {
QXcbEventNode(xcb_generic_event_t *e = nullptr)
: event(e) { }
xcb_generic_event_t *event;
QXcbEventNode *next = nullptr;
bool fromHeap = false;
};
class QXcbConnection;
class QAbstractEventDispatcher;
class QXcbEventQueue : public QThread
{
Q_OBJECT
public:
QXcbEventQueue(QXcbConnection *connection);
~QXcbEventQueue();
enum { PoolSize = 100 }; // 2.4 kB with 100 nodes
enum PeekOption {
PeekDefault = 0, // see qx11info_x11.h for docs
PeekFromCachedIndex = 1,
PeekRetainMatch = 2,
PeekRemoveMatch = 3,
PeekRemoveMatchContinue = 4
};
Q_DECLARE_FLAGS(PeekOptions, PeekOption)
void run() override;
bool isEmpty() const { return m_head == m_flushedTail && !m_head->event; }
xcb_generic_event_t *takeFirst(QEventLoop::ProcessEventsFlags flags);
xcb_generic_event_t *takeFirst();
void flushBufferedEvents();
void wakeUpDispatcher();
// ### peek() and peekEventQueue() could be unified. Note that peekEventQueue()
// is public API exposed via QX11Extras/QX11Info.
template<typename Peeker>
xcb_generic_event_t *peek(Peeker &&peeker) {
return peek(PeekRemoveMatch, std::forward<Peeker>(peeker));
}
template<typename Peeker>
inline xcb_generic_event_t *peek(PeekOption config, Peeker &&peeker);
qint32 generatePeekerId();
bool removePeekerId(qint32 peekerId);
using PeekerCallback = bool (*)(xcb_generic_event_t *event, void *peekerData);
bool peekEventQueue(PeekerCallback peeker, void *peekerData = nullptr,
PeekOptions option = PeekDefault, qint32 peekerId = -1);
const QXcbEventNode *flushedTail() const { return m_flushedTail; }
void waitForNewEvents(const QXcbEventNode *sinceFlushedTail, unsigned long time = ULONG_MAX);
private:
QXcbEventNode *qXcbEventNodeFactory(xcb_generic_event_t *event);
void dequeueNode();
void sendCloseConnectionEvent() const;
bool isCloseConnectionEvent(const xcb_generic_event_t *event);
QXcbEventNode *m_head = nullptr;
QXcbEventNode *m_flushedTail = nullptr;
std::atomic<QXcbEventNode *> m_tail { nullptr };
std::atomic_uint m_nodesRestored { 0 };
QXcbConnection *m_connection = nullptr;
bool m_closeConnectionDetected = false;
uint m_freeNodes = PoolSize;
uint m_poolIndex = 0;
qint32 m_peekerIdSource = 0;
bool m_queueModified = false;
bool m_peekerIndexCacheDirty = false;
QHash<qint32, QXcbEventNode *> m_peekerToNode;
QVector<xcb_generic_event_t *> m_inputEvents;
// debug stats
quint64 m_nodesOnHeap = 0;
QMutex m_newEventsMutex;
QWaitCondition m_newEventsCondition;
};
template<typename Peeker>
xcb_generic_event_t *QXcbEventQueue::peek(PeekOption option, Peeker &&peeker)
{
flushBufferedEvents();
if (isEmpty())
return nullptr;
QXcbEventNode *node = m_head;
do {
xcb_generic_event_t *event = node->event;
if (event && peeker(event, event->response_type & ~0x80)) {
if (option == PeekRemoveMatch || option == PeekRemoveMatchContinue)
node->event = nullptr;
if (option != PeekRemoveMatchContinue)
return event;
}
if (node == m_flushedTail)
break;
node = node->next;
} while (true);
return nullptr;
}
QT_END_NAMESPACE
#endif
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