qtbase/src/corelib/kernel/qtimerinfo_unix_p.h

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#ifndef QTIMERINFO_UNIX_P_H
#define QTIMERINFO_UNIX_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.
//

// #define QTIMERINFO_DEBUG

#include "qabstracteventdispatcher.h"

#include <sys/time.h> // struct timeval

QT_BEGIN_NAMESPACE

// internal timer info
struct QTimerInfo {
    int id;           // - timer identifier
    int interval;     // - timer interval in milliseconds
    Qt::TimerType timerType; // - timer type
    timeval expected; // when timer is expected to fire
    timeval timeout;  // - when to actually fire
    QObject *obj;     // - object to receive event
    QTimerInfo **activateRef; // - ref from activateTimers

#ifdef QTIMERINFO_DEBUG
    float cumulativeError;
    uint count;
#endif
};

class QTimerInfoList : public QList<QTimerInfo*>
{
#if ((_POSIX_MONOTONIC_CLOCK-0 <= 0) && !defined(Q_OS_MAC)) || defined(QT_BOOTSTRAPPED)
    timeval previousTime;
    clock_t previousTicks;
    int ticksPerSecond;
    int msPerTick;

    bool timeChanged(timeval *delta);
    void timerRepair(const timeval &);
#endif

    // state variables used by activateTimers()
    QTimerInfo *firstTimerInfo;

public:
    QTimerInfoList();

    timeval currentTime;
    timeval updateCurrentTime();

    // must call updateCurrentTime() first!
    void repairTimersIfNeeded();

    bool timerWait(timeval &);
    void timerInsert(QTimerInfo *);

    void registerTimer(int timerId, int interval, Qt::TimerType timerType, QObject *object);
    bool unregisterTimer(int timerId);
    bool unregisterTimers(QObject *object);
    QList<QAbstractEventDispatcher::TimerInfo> registeredTimers(QObject *object) const;

    int activateTimers();
};

QT_END_NAMESPACE

#endif // QTIMERINFO_UNIX_P_H