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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QXCBEVENTQUEUE_H
#define QXCBEVENTQUEUE_H
#include <QtCore/QThread>
#include <QtCore/QHash>
#include <QtCore/QEventLoop>
#include <QtCore/QList>
#include <QtCore/QMutex>
#include <QtCore/QWaitCondition>
#include <xcb/xcb.h>
#include <atomic>
#include <limits>
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 {
// See qx11info_x11.cpp in X11 Extras module.
PeekDefault = 0,
// See qx11info_x11.cpp in X11 Extras module.
PeekFromCachedIndex = 1,
// Used by the event compression algorithms to determine if
// the currently processed event (which has been already dequeued)
// can be compressed. Returns from the QXcbEventQueue::peek()
// on the first match.
PeekRetainMatch = 2,
// Marks the event in the node as "nullptr". The actual
// node remains in the queue. The nodes are unlinked only
// by dequeueNode(). Returns from the QXcbEventQueue::peek()
// on the first match.
PeekConsumeMatch = 3,
// Same as above, but continues to the next node in the
// queue. Repeats this until the flushed tailed node has
// been reached.
PeekConsumeMatchAndContinue = 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. PeekOption could be reworked to
// have values that can be OR-ed together.
template<typename Peeker>
xcb_generic_event_t *peek(Peeker &&peeker) {
return peek(PeekConsumeMatch, 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 = (std::numeric_limits<unsigned long>::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;
QList<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 == PeekConsumeMatch || option == PeekConsumeMatchAndContinue)
node->event = nullptr;
if (option != PeekConsumeMatchAndContinue)
return event;
}
if (node == m_flushedTail)
break;
node = node->next;
} while (true);
return nullptr;
}
QT_END_NAMESPACE
#endif
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